Move dex pc frame creation into libunwindstack.

Test: Compiles, all unit tests pass.
Test: Ran 137-cfi art test in interpreter and verified interpreter
Test: frames still show up.

Change-Id: Icea90194986faa733a873e8cf467fc2513eb5573
diff --git a/libunwindstack/DexFiles.cpp b/libunwindstack/DexFiles.cpp
new file mode 100644
index 0000000..3d67a6a
--- /dev/null
+++ b/libunwindstack/DexFiles.cpp
@@ -0,0 +1,65 @@
+/*
+ * 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 <stdint.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <memory>
+
+#include <unwindstack/DexFiles.h>
+#include <unwindstack/MapInfo.h>
+#include <unwindstack/Memory.h>
+
+#include "DexFile.h"
+
+namespace unwindstack {
+
+DexFiles::DexFiles(std::shared_ptr<Memory>& memory) : memory_(memory) {}
+
+DexFiles::~DexFiles() {
+  for (auto& entry : files_) {
+    delete entry.second;
+  }
+}
+
+DexFile* DexFiles::GetDexFile(uint64_t dex_file_offset, MapInfo* info) {
+  // Lock while processing the data.
+  std::lock_guard<std::mutex> guard(files_lock_);
+  DexFile* dex_file;
+  auto entry = files_.find(dex_file_offset);
+  if (entry == files_.end()) {
+    dex_file = DexFile::Create(dex_file_offset, memory_.get(), info);
+    files_[dex_file_offset] = dex_file;
+  } else {
+    dex_file = entry->second;
+  }
+  return dex_file;
+}
+
+void DexFiles::GetMethodInformation(uint64_t dex_offset, MapInfo* info, std::string* method_name,
+                                    uint64_t* method_offset) {
+  DexFile* dex_file = GetDexFile(dex_offset, info);
+  if (dex_file != nullptr) {
+    dex_file->GetMethodInformation(dex_offset, method_name, method_offset);
+  }
+}
+
+void DexFiles::SetArch(ArchEnum) {}
+
+}  // namespace unwindstack