Add function definitions for MapInfo.
Bug: 23762183
Test: All new unit tests pass.
Change-Id: I26a1f6e84bf1a02447eff48ff6e35068554330fe
diff --git a/libunwindstack/MapInfo.cpp b/libunwindstack/MapInfo.cpp
new file mode 100644
index 0000000..051f700
--- /dev/null
+++ b/libunwindstack/MapInfo.cpp
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2017 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 <sys/types.h>
+#include <unistd.h>
+
+#include <memory>
+#include <string>
+
+#include "Elf.h"
+#include "MapInfo.h"
+#include "Maps.h"
+#include "Memory.h"
+
+Memory* MapInfo::CreateMemory(pid_t pid) {
+ if (end <= start) {
+ return nullptr;
+ }
+
+ elf_offset = 0;
+
+ // First try and use the file associated with the info.
+ if (!name.empty()) {
+ // Fail on device maps.
+ if (flags & MAPS_FLAGS_DEVICE_MAP) {
+ return nullptr;
+ }
+
+ std::unique_ptr<MemoryFileAtOffset> file_memory(new MemoryFileAtOffset);
+ uint64_t map_size;
+ if (offset != 0) {
+ // Only map in a piece of the file.
+ map_size = end - start;
+ } else {
+ map_size = UINT64_MAX;
+ }
+ if (file_memory->Init(name, offset, map_size)) {
+ // It's possible that a non-zero offset might not be pointing to
+ // valid elf data. Check if this is a valid elf, and if not assume
+ // that this was meant to incorporate the entire file.
+ if (offset != 0 && !Elf::IsValidElf(file_memory.get())) {
+ // Don't bother checking the validity that will happen on the elf init.
+ if (file_memory->Init(name, 0)) {
+ elf_offset = offset;
+ return file_memory.release();
+ }
+ // Fall through if the init fails.
+ } else {
+ return file_memory.release();
+ }
+ }
+ }
+
+ Memory* memory = nullptr;
+ if (pid == getpid()) {
+ memory = new MemoryLocal();
+ } else {
+ memory = new MemoryRemote(pid);
+ }
+ return new MemoryRange(memory, start, end);
+}
+
+Elf* MapInfo::GetElf(pid_t pid, bool) {
+ if (elf) {
+ return elf;
+ }
+
+ elf = new Elf(CreateMemory(pid));
+ elf->Init();
+ // If the init fails, keep the elf around as an invalid object so we
+ // don't try to reinit the object.
+ return elf;
+}