1 files changed, 113 insertions, 0 deletions
diff --git a/runtime/debug_print.cc b/runtime/debug_print.cc
new file mode 100644
index 0000000000..44a183669d
--- /dev/null
+++ b/runtime/debug_print.cc
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sstream>
+
+#include "debug_print.h"
+
+#include "class_linker.h"
+#include "class_table.h"
+#include "class_loader_utils.h"
+#include "dex/utf.h"
+#include "gc/heap.h"
+#include "gc/space/space-inl.h"
+#include "mirror/class.h"
+#include "mirror/class_loader.h"
+#include "runtime.h"
+#include "scoped_thread_state_change-inl.h"
+#include "thread-current-inl.h"
+#include "well_known_classes.h"
+
+namespace art {
+
+std::string DescribeSpace(ObjPtr<mirror::Class> klass) {
+  std::ostringstream oss;
+  gc::Heap* heap = Runtime::Current()->GetHeap();
+  gc::space::ContinuousSpace* cs =
+      heap->FindContinuousSpaceFromObject(klass.Ptr(), /* fail_ok */ true);
+  if (cs != nullptr) {
+    if (cs->IsImageSpace()) {
+      oss << "image;" << cs->GetName() << ";" << cs->AsImageSpace()->GetImageFilename();
+    } else {
+      oss << "continuous;" << cs->GetName();
+    }
+  } else {
+    gc::space::DiscontinuousSpace* ds =
+        heap->FindDiscontinuousSpaceFromObject(klass, /* fail_ok */ true);
+    if (ds != nullptr) {
+      oss << "discontinuous;" << ds->GetName();
+    } else {
+      oss << "invalid";
+    }
+  }
+  return oss.str();
+}
+
+std::string DescribeLoaders(ObjPtr<mirror::ClassLoader> loader, const char* class_descriptor) {
+  std::ostringstream oss;
+  uint32_t hash = ComputeModifiedUtf8Hash(class_descriptor);
+  ObjPtr<mirror::Class> path_class_loader =
+      WellKnownClasses::ToClass(WellKnownClasses::dalvik_system_PathClassLoader);
+  ObjPtr<mirror::Class> dex_class_loader =
+      WellKnownClasses::ToClass(WellKnownClasses::dalvik_system_DexClassLoader);
+  ObjPtr<mirror::Class> delegate_last_class_loader =
+      WellKnownClasses::ToClass(WellKnownClasses::dalvik_system_DelegateLastClassLoader);
+
+  // Print the class loader chain.
+  bool found_class = false;
+  const char* loader_separator = "";
+  if (loader == nullptr) {
+    oss << "BootClassLoader";  // This would be unexpected.
+  }
+  for (; loader != nullptr; loader = loader->GetParent()) {
+    oss << loader_separator << loader->GetClass()->PrettyDescriptor();
+    loader_separator = ";";
+    // If we didn't find the class yet, try to find it in the current class loader.
+    if (!found_class) {
+      ClassTable* table = Runtime::Current()->GetClassLinker()->ClassTableForClassLoader(loader);
+      ObjPtr<mirror::Class> klass =
+          (table != nullptr) ? table->Lookup(class_descriptor, hash) : nullptr;
+      if (klass != nullptr) {
+        found_class = true;
+        oss << "[hit:" << DescribeSpace(klass) << "]";
+      }
+    }
+
+    // For PathClassLoader, DexClassLoader or DelegateLastClassLoader
+    // also dump the dex file locations.
+    if (loader->GetClass() == path_class_loader ||
+        loader->GetClass() == dex_class_loader ||
+        loader->GetClass() == delegate_last_class_loader) {
+      oss << "(";
+      ScopedObjectAccessUnchecked soa(Thread::Current());
+      StackHandleScope<1> hs(soa.Self());
+      Handle<mirror::ClassLoader> handle(hs.NewHandle(loader));
+      const char* path_separator = "";
+      VisitClassLoaderDexFiles(soa,
+                               handle,
+                               [&](const DexFile* dex_file) {
+                                 oss << path_separator << dex_file->GetLocation();
+                                 path_separator = ":";
+                                 return true;  // Continue with the next DexFile.
+                               });
+      oss << ")";
+    }
+  }
+
+  return oss.str();
+}
+
+}  // namespace art