ART: Add method name support to TI

Add support for GetMethodName.

Bug: 31684812
Test: m test-art-host
Change-Id: I55e7b6dac7e7193c3d9979ebb289b0e2849ad030
diff --git a/runtime/openjdkjvmti/art_jvmti.h b/runtime/openjdkjvmti/art_jvmti.h
index 66d0937..78cb9a0 100644
--- a/runtime/openjdkjvmti/art_jvmti.h
+++ b/runtime/openjdkjvmti/art_jvmti.h
@@ -37,6 +37,8 @@
 #include <jni.h>
 
 #include "base/casts.h"
+#include "base/logging.h"
+#include "base/macros.h"
 #include "events.h"
 #include "java_vm_ext.h"
 #include "jni_env_ext.h"
@@ -80,6 +82,32 @@
   return ret_value;
 }
 
+class JvmtiDeleter {
+ public:
+  JvmtiDeleter() : env_(nullptr) {}
+  explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}
+
+  JvmtiDeleter(JvmtiDeleter&) = default;
+  JvmtiDeleter(JvmtiDeleter&&) = default;
+  JvmtiDeleter& operator=(const JvmtiDeleter&) = default;
+
+  void operator()(unsigned char* ptr) const {
+    CHECK(env_ != nullptr);
+    jvmtiError ret = env_->Deallocate(ptr);
+    CHECK(ret == ERR(NONE));
+  }
+
+ private:
+  mutable jvmtiEnv* env_;
+};
+
+using JvmtiUniquePtr = std::unique_ptr<unsigned char, JvmtiDeleter>;
+
+ALWAYS_INLINE
+static inline JvmtiUniquePtr MakeJvmtiUniquePtr(jvmtiEnv* env, unsigned char* mem) {
+  return JvmtiUniquePtr(mem, JvmtiDeleter(env));
+}
+
 }  // namespace openjdkjvmti
 
 #endif  // ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_