diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index 89d4fc0..4e0470e 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -94,10 +94,7 @@
                 "DexFile.cpp",
                 "DexFiles.cpp",
             ],
-            exclude_shared_libs: [
-                "libdexfile_external",
-                "libdexfile_support",
-            ],
+            exclude_shared_libs: ["libdexfile"],
         },
         recovery: {
             cflags: ["-DNO_LIBDEXFILE_SUPPORT"],
@@ -105,10 +102,7 @@
                 "DexFile.cpp",
                 "DexFiles.cpp",
             ],
-            exclude_shared_libs: [
-                "libdexfile_external",
-                "libdexfile_support",
-            ],
+            exclude_shared_libs: ["libdexfile"],
         },
     },
 
@@ -133,8 +127,7 @@
 
     shared_libs: [
         "libbase",
-        "libdexfile_external",
-        "libdexfile_support",
+        "libdexfile",
         "liblog",
         "liblzma",
     ],
@@ -222,7 +215,6 @@
         "liblzma",
         "libunwindstack",
         "libdexfile",
-        "libdexfile_support",
     ],
 
     static_libs: [
diff --git a/libunwindstack/DexFile.cpp b/libunwindstack/DexFile.cpp
index 9b0b232..8ec560c 100644
--- a/libunwindstack/DexFile.cpp
+++ b/libunwindstack/DexFile.cpp
@@ -23,7 +23,13 @@
 #include <memory>
 
 #include <android-base/unique_fd.h>
-#include <art_api/ext_dex_file.h>
+
+#include <dex/class_accessor-inl.h>
+#include <dex/code_item_accessors-inl.h>
+#include <dex/compact_dex_file.h>
+#include <dex/dex_file-inl.h>
+#include <dex/dex_file_loader.h>
+#include <dex/standard_dex_file.h>
 
 #include <unwindstack/MapInfo.h>
 #include <unwindstack/Memory.h>
@@ -32,71 +38,169 @@
 
 namespace unwindstack {
 
-std::unique_ptr<DexFile> DexFile::Create(uint64_t dex_file_offset_in_memory, Memory* memory,
-                                         MapInfo* info) {
+DexFile* DexFile::Create(uint64_t dex_file_offset_in_memory, Memory* memory, MapInfo* info) {
   if (!info->name.empty()) {
-    std::unique_ptr<DexFile> dex_file =
-        DexFileFromFile::Create(dex_file_offset_in_memory - info->start + info->offset, info->name);
-    if (dex_file) {
-      return dex_file;
+    std::unique_ptr<DexFileFromFile> dex_file(new DexFileFromFile);
+    if (dex_file->Open(dex_file_offset_in_memory - info->start + info->offset, info->name)) {
+      return dex_file.release();
     }
   }
-  return DexFileFromMemory::Create(dex_file_offset_in_memory, memory, info->name);
+
+  std::unique_ptr<DexFileFromMemory> dex_file(new DexFileFromMemory);
+  if (dex_file->Open(dex_file_offset_in_memory, memory)) {
+    return dex_file.release();
+  }
+  return nullptr;
+}
+
+DexFileFromFile::~DexFileFromFile() {
+  if (size_ != 0) {
+    munmap(mapped_memory_, size_);
+  }
 }
 
 bool DexFile::GetMethodInformation(uint64_t dex_offset, std::string* method_name,
                                    uint64_t* method_offset) {
-  art_api::dex::MethodInfo method_info = GetMethodInfoForOffset(dex_offset);
-  if (method_info.offset == 0) {
+  if (dex_file_ == nullptr) {
     return false;
   }
-  *method_name = method_info.name;
-  *method_offset = dex_offset - method_info.offset;
-  return true;
+
+  if (!dex_file_->IsInDataSection(dex_file_->Begin() + dex_offset)) {
+    return false;  // The DEX offset is not within the bytecode of this dex file.
+  }
+
+  if (dex_file_->IsCompactDexFile()) {
+    // The data section of compact dex files might be shared.
+    // Check the subrange unique to this compact dex.
+    const auto& cdex_header = dex_file_->AsCompactDexFile()->GetHeader();
+    uint32_t begin = cdex_header.data_off_ + cdex_header.OwnedDataBegin();
+    uint32_t end = cdex_header.data_off_ + cdex_header.OwnedDataEnd();
+    if (dex_offset < begin || dex_offset >= end) {
+      return false;  // The DEX offset is not within the bytecode of this dex file.
+    }
+  }
+
+  // The method data is cached in a std::map indexed by method end offset and
+  // contains the start offset and the method member index.
+  // Only cache the method data as it is searched. Do not read the entire
+  // set of method data into the cache at once.
+  // This is done because many unwinds only find a single frame with dex file
+  // info, so reading the entire method data is wasteful. However, still cache
+  // the data so that anything doing multiple unwinds will have this data
+  // cached for future use.
+
+  // First look in the method cache.
+  auto entry = method_cache_.upper_bound(dex_offset);
+  if (entry != method_cache_.end() && dex_offset >= entry->second.first) {
+    *method_name = dex_file_->PrettyMethod(entry->second.second, false);
+    *method_offset = dex_offset - entry->second.first;
+    return true;
+  }
+
+  // Check the methods we haven't cached.
+  for (; class_def_index_ < dex_file_->NumClassDefs(); class_def_index_++) {
+    art::ClassAccessor accessor(*dex_file_, dex_file_->GetClassDef(class_def_index_));
+
+    for (const art::ClassAccessor::Method& method : accessor.GetMethods()) {
+      art::CodeItemInstructionAccessor code = method.GetInstructions();
+      if (!code.HasCodeItem()) {
+        continue;
+      }
+      uint32_t offset = reinterpret_cast<const uint8_t*>(code.Insns()) - dex_file_->Begin();
+      uint32_t offset_end = offset + code.InsnsSizeInBytes();
+      uint32_t member_index = method.GetIndex();
+      method_cache_[offset_end] = std::make_pair(offset, member_index);
+      if (offset <= dex_offset && dex_offset < offset_end) {
+        *method_name = dex_file_->PrettyMethod(member_index, false);
+        *method_offset = dex_offset - offset;
+        return true;
+      }
+    }
+  }
+  return false;
 }
 
-std::unique_ptr<DexFileFromFile> DexFileFromFile::Create(uint64_t dex_file_offset_in_file,
-                                                         const std::string& file) {
+bool DexFileFromFile::Open(uint64_t dex_file_offset_in_file, const std::string& file) {
   android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file.c_str(), O_RDONLY | O_CLOEXEC)));
   if (fd == -1) {
-    return nullptr;
+    return false;
+  }
+  struct stat buf;
+  if (fstat(fd, &buf) == -1) {
+    return false;
+  }
+  uint64_t length;
+  if (buf.st_size < 0 ||
+      __builtin_add_overflow(dex_file_offset_in_file, sizeof(art::DexFile::Header), &length) ||
+      static_cast<uint64_t>(buf.st_size) < length) {
+    return false;
   }
 
+  mapped_memory_ = mmap(nullptr, buf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+  if (mapped_memory_ == MAP_FAILED) {
+    return false;
+  }
+  size_ = buf.st_size;
+
+  uint8_t* memory = reinterpret_cast<uint8_t*>(mapped_memory_);
+
+  art::DexFile::Header* header =
+      reinterpret_cast<art::DexFile::Header*>(&memory[dex_file_offset_in_file]);
+  if (!art::StandardDexFile::IsMagicValid(header->magic_) &&
+      !art::CompactDexFile::IsMagicValid(header->magic_)) {
+    return false;
+  }
+
+  if (__builtin_add_overflow(dex_file_offset_in_file, header->file_size_, &length) ||
+      static_cast<uint64_t>(buf.st_size) < length) {
+    return false;
+  }
+
+  art::DexFileLoader loader;
   std::string error_msg;
-  std::unique_ptr<art_api::dex::DexFile> art_dex_file =
-      OpenFromFd(fd, dex_file_offset_in_file, file, &error_msg);
-  if (art_dex_file == nullptr) {
-    return nullptr;
-  }
-
-  return std::unique_ptr<DexFileFromFile>(new DexFileFromFile(std::move(*art_dex_file.release())));
+  auto dex = loader.Open(&memory[dex_file_offset_in_file], header->file_size_, "", 0, nullptr,
+                         false, false, &error_msg);
+  dex_file_.reset(dex.release());
+  return dex_file_ != nullptr;
 }
 
-std::unique_ptr<DexFileFromMemory> DexFileFromMemory::Create(uint64_t dex_file_offset_in_memory,
-                                                             Memory* memory,
-                                                             const std::string& name) {
-  std::vector<uint8_t> backing_memory;
-
-  for (size_t size = 0;;) {
-    std::string error_msg;
-    std::unique_ptr<art_api::dex::DexFile> art_dex_file =
-        OpenFromMemory(backing_memory.data(), &size, name, &error_msg);
-
-    if (art_dex_file != nullptr) {
-      return std::unique_ptr<DexFileFromMemory>(
-          new DexFileFromMemory(std::move(*art_dex_file.release()), std::move(backing_memory)));
-    }
-
-    if (!error_msg.empty()) {
-      return nullptr;
-    }
-
-    backing_memory.resize(size);
-    if (!memory->ReadFully(dex_file_offset_in_memory, backing_memory.data(),
-                           backing_memory.size())) {
-      return nullptr;
-    }
+bool DexFileFromMemory::Open(uint64_t dex_file_offset_in_memory, Memory* memory) {
+  memory_.resize(sizeof(art::DexFile::Header));
+  if (!memory->ReadFully(dex_file_offset_in_memory, memory_.data(), memory_.size())) {
+    return false;
   }
+
+  art::DexFile::Header* header = reinterpret_cast<art::DexFile::Header*>(memory_.data());
+  uint32_t file_size = header->file_size_;
+  if (art::CompactDexFile::IsMagicValid(header->magic_)) {
+    // Compact dex file store data section separately so that it can be shared.
+    // Therefore we need to extend the read memory range to include it.
+    // TODO: This might be wasteful as we might read data in between as well.
+    //       In practice, this should be fine, as such sharing only happens on disk.
+    uint32_t computed_file_size;
+    if (__builtin_add_overflow(header->data_off_, header->data_size_, &computed_file_size)) {
+      return false;
+    }
+    if (computed_file_size > file_size) {
+      file_size = computed_file_size;
+    }
+  } else if (!art::StandardDexFile::IsMagicValid(header->magic_)) {
+    return false;
+  }
+
+  memory_.resize(file_size);
+  if (!memory->ReadFully(dex_file_offset_in_memory, memory_.data(), memory_.size())) {
+    return false;
+  }
+
+  header = reinterpret_cast<art::DexFile::Header*>(memory_.data());
+
+  art::DexFileLoader loader;
+  std::string error_msg;
+  auto dex =
+      loader.Open(memory_.data(), header->file_size_, "", 0, nullptr, false, false, &error_msg);
+  dex_file_.reset(dex.release());
+  return dex_file_ != nullptr;
 }
 
 }  // namespace unwindstack
diff --git a/libunwindstack/DexFile.h b/libunwindstack/DexFile.h
index 5797dee..c123158 100644
--- a/libunwindstack/DexFile.h
+++ b/libunwindstack/DexFile.h
@@ -25,41 +25,48 @@
 #include <utility>
 #include <vector>
 
-#include <art_api/ext_dex_file.h>
+#include <dex/dex_file-inl.h>
 
 namespace unwindstack {
 
-class DexFile : protected art_api::dex::DexFile {
+class DexFile {
  public:
+  DexFile() = default;
   virtual ~DexFile() = default;
 
   bool GetMethodInformation(uint64_t dex_offset, std::string* method_name, uint64_t* method_offset);
 
-  static std::unique_ptr<DexFile> Create(uint64_t dex_file_offset_in_memory, Memory* memory,
-                                         MapInfo* info);
+  static DexFile* Create(uint64_t dex_file_offset_in_memory, Memory* memory, MapInfo* info);
 
  protected:
-  DexFile(art_api::dex::DexFile&& art_dex_file) : art_api::dex::DexFile(std::move(art_dex_file)) {}
+  void Init();
+
+  std::unique_ptr<const art::DexFile> dex_file_;
+  std::map<uint32_t, std::pair<uint64_t, uint32_t>> method_cache_;  // dex offset to method index.
+
+  uint32_t class_def_index_ = 0;
 };
 
 class DexFileFromFile : public DexFile {
  public:
-  static std::unique_ptr<DexFileFromFile> Create(uint64_t dex_file_offset_in_file,
-                                                 const std::string& file);
+  DexFileFromFile() = default;
+  virtual ~DexFileFromFile();
+
+  bool Open(uint64_t dex_file_offset_in_file, const std::string& name);
 
  private:
-  DexFileFromFile(art_api::dex::DexFile&& art_dex_file) : DexFile(std::move(art_dex_file)) {}
+  void* mapped_memory_ = nullptr;
+  size_t size_ = 0;
 };
 
 class DexFileFromMemory : public DexFile {
  public:
-  static std::unique_ptr<DexFileFromMemory> Create(uint64_t dex_file_offset_in_memory,
-                                                   Memory* memory, const std::string& name);
+  DexFileFromMemory() = default;
+  virtual ~DexFileFromMemory() = default;
+
+  bool Open(uint64_t dex_file_offset_in_memory, Memory* memory);
 
  private:
-  DexFileFromMemory(art_api::dex::DexFile&& art_dex_file, std::vector<uint8_t>&& memory)
-      : DexFile(std::move(art_dex_file)), memory_(std::move(memory)) {}
-
   std::vector<uint8_t> memory_;
 };
 
diff --git a/libunwindstack/DexFiles.cpp b/libunwindstack/DexFiles.cpp
index 63a77e5..451a0b9 100644
--- a/libunwindstack/DexFiles.cpp
+++ b/libunwindstack/DexFiles.cpp
@@ -48,7 +48,11 @@
 DexFiles::DexFiles(std::shared_ptr<Memory>& memory, std::vector<std::string>& search_libs)
     : Global(memory, search_libs) {}
 
-DexFiles::~DexFiles() {}
+DexFiles::~DexFiles() {
+  for (auto& entry : files_) {
+    delete entry.second;
+  }
+}
 
 void DexFiles::ProcessArch() {
   switch (arch()) {
@@ -133,11 +137,10 @@
   DexFile* dex_file;
   auto entry = files_.find(dex_file_offset);
   if (entry == files_.end()) {
-    std::unique_ptr<DexFile> new_dex_file = DexFile::Create(dex_file_offset, memory_.get(), info);
-    dex_file = new_dex_file.get();
-    files_[dex_file_offset] = std::move(new_dex_file);
+    dex_file = DexFile::Create(dex_file_offset, memory_.get(), info);
+    files_[dex_file_offset] = dex_file;
   } else {
-    dex_file = entry->second.get();
+    dex_file = entry->second;
   }
   return dex_file;
 }
diff --git a/libunwindstack/include/unwindstack/DexFiles.h b/libunwindstack/include/unwindstack/DexFiles.h
index 0336173..c202a33 100644
--- a/libunwindstack/include/unwindstack/DexFiles.h
+++ b/libunwindstack/include/unwindstack/DexFiles.h
@@ -66,7 +66,7 @@
 
   std::mutex lock_;
   bool initialized_ = false;
-  std::unordered_map<uint64_t, std::unique_ptr<DexFile>> files_;
+  std::unordered_map<uint64_t, DexFile*> files_;
 
   uint64_t entry_addr_ = 0;
   uint64_t (DexFiles::*read_entry_ptr_func_)(uint64_t) = nullptr;
diff --git a/libunwindstack/tests/DexFileTest.cpp b/libunwindstack/tests/DexFileTest.cpp
index 21ca47b..95d2176 100644
--- a/libunwindstack/tests/DexFileTest.cpp
+++ b/libunwindstack/tests/DexFileTest.cpp
@@ -21,37 +21,44 @@
 #include <unordered_map>
 
 #include <android-base/file.h>
-#include <dex/dex_file.h>
-#include <gtest/gtest.h>
+
 #include <unwindstack/MapInfo.h>
 #include <unwindstack/Memory.h>
 
+#include <dex/code_item_accessors-inl.h>
+#include <dex/standard_dex_file.h>
+
+#include <gtest/gtest.h>
+
 #include "DexFile.h"
+
 #include "DexFileData.h"
 #include "MemoryFake.h"
 
 namespace unwindstack {
 
 TEST(DexFileTest, from_file_open_non_exist) {
-  EXPECT_TRUE(DexFileFromFile::Create(0, "/file/does/not/exist") == nullptr);
+  DexFileFromFile dex_file;
+  ASSERT_FALSE(dex_file.Open(0, "/file/does/not/exist"));
 }
 
 TEST(DexFileTest, from_file_open_too_small) {
   TemporaryFile tf;
   ASSERT_TRUE(tf.fd != -1);
 
-  ASSERT_EQ(sizeof(art::DexFile::Header) - 1,
+  ASSERT_EQ(sizeof(art::DexFile::Header) - 2,
             static_cast<size_t>(
-                TEMP_FAILURE_RETRY(write(tf.fd, kDexData, sizeof(art::DexFile::Header) - 1))));
+                TEMP_FAILURE_RETRY(write(tf.fd, kDexData, sizeof(art::DexFile::Header)) - 2)));
 
   // Header too small.
-  EXPECT_TRUE(DexFileFromFile::Create(0, tf.path) == nullptr);
+  DexFileFromFile dex_file;
+  ASSERT_FALSE(dex_file.Open(0, tf.path));
 
   // Header correct, file too small.
   ASSERT_EQ(0, lseek(tf.fd, 0, SEEK_SET));
   ASSERT_EQ(sizeof(art::DexFile::Header), static_cast<size_t>(TEMP_FAILURE_RETRY(write(
                                               tf.fd, kDexData, sizeof(art::DexFile::Header)))));
-  EXPECT_TRUE(DexFileFromFile::Create(0, tf.path) == nullptr);
+  ASSERT_FALSE(dex_file.Open(0, tf.path));
 }
 
 TEST(DexFileTest, from_file_open) {
@@ -61,7 +68,8 @@
   ASSERT_EQ(sizeof(kDexData),
             static_cast<size_t>(TEMP_FAILURE_RETRY(write(tf.fd, kDexData, sizeof(kDexData)))));
 
-  EXPECT_TRUE(DexFileFromFile::Create(0, tf.path) != nullptr);
+  DexFileFromFile dex_file;
+  ASSERT_TRUE(dex_file.Open(0, tf.path));
 }
 
 TEST(DexFileTest, from_file_open_non_zero_offset) {
@@ -72,31 +80,35 @@
   ASSERT_EQ(sizeof(kDexData),
             static_cast<size_t>(TEMP_FAILURE_RETRY(write(tf.fd, kDexData, sizeof(kDexData)))));
 
-  EXPECT_TRUE(DexFileFromFile::Create(0x100, tf.path) != nullptr);
+  DexFileFromFile dex_file;
+  ASSERT_TRUE(dex_file.Open(0x100, tf.path));
 }
 
 TEST(DexFileTest, from_memory_fail_too_small_for_header) {
   MemoryFake memory;
 
   memory.SetMemory(0x1000, kDexData, sizeof(art::DexFile::Header) - 1);
+  DexFileFromMemory dex_file;
 
-  EXPECT_TRUE(DexFileFromMemory::Create(0x1000, &memory, "") == nullptr);
+  ASSERT_FALSE(dex_file.Open(0x1000, &memory));
 }
 
 TEST(DexFileTest, from_memory_fail_too_small_for_data) {
   MemoryFake memory;
 
   memory.SetMemory(0x1000, kDexData, sizeof(kDexData) - 2);
+  DexFileFromMemory dex_file;
 
-  EXPECT_TRUE(DexFileFromMemory::Create(0x1000, &memory, "") == nullptr);
+  ASSERT_FALSE(dex_file.Open(0x1000, &memory));
 }
 
 TEST(DexFileTest, from_memory_open) {
   MemoryFake memory;
 
   memory.SetMemory(0x1000, kDexData, sizeof(kDexData));
+  DexFileFromMemory dex_file;
 
-  EXPECT_TRUE(DexFileFromMemory::Create(0x1000, &memory, "") != nullptr);
+  ASSERT_TRUE(dex_file.Open(0x1000, &memory));
 }
 
 TEST(DexFileTest, create_using_file) {
@@ -109,7 +121,8 @@
 
   MemoryFake memory;
   MapInfo info(nullptr, 0, 0x10000, 0, 0x5, tf.path);
-  EXPECT_TRUE(DexFile::Create(0x500, &memory, &info) != nullptr);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x500, &memory, &info));
+  ASSERT_TRUE(dex_file != nullptr);
 }
 
 TEST(DexFileTest, create_using_file_non_zero_start) {
@@ -122,7 +135,8 @@
 
   MemoryFake memory;
   MapInfo info(nullptr, 0x100, 0x10000, 0, 0x5, tf.path);
-  EXPECT_TRUE(DexFile::Create(0x600, &memory, &info) != nullptr);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x600, &memory, &info));
+  ASSERT_TRUE(dex_file != nullptr);
 }
 
 TEST(DexFileTest, create_using_file_non_zero_offset) {
@@ -135,21 +149,24 @@
 
   MemoryFake memory;
   MapInfo info(nullptr, 0x100, 0x10000, 0x200, 0x5, tf.path);
-  EXPECT_TRUE(DexFile::Create(0x400, &memory, &info) != nullptr);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x400, &memory, &info));
+  ASSERT_TRUE(dex_file != nullptr);
 }
 
 TEST(DexFileTest, create_using_memory_empty_file) {
   MemoryFake memory;
   memory.SetMemory(0x4000, kDexData, sizeof(kDexData));
   MapInfo info(nullptr, 0x100, 0x10000, 0x200, 0x5, "");
-  EXPECT_TRUE(DexFile::Create(0x4000, &memory, &info) != nullptr);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x4000, &memory, &info));
+  ASSERT_TRUE(dex_file != nullptr);
 }
 
 TEST(DexFileTest, create_using_memory_file_does_not_exist) {
   MemoryFake memory;
   memory.SetMemory(0x4000, kDexData, sizeof(kDexData));
   MapInfo info(nullptr, 0x100, 0x10000, 0x200, 0x5, "/does/not/exist");
-  EXPECT_TRUE(DexFile::Create(0x4000, &memory, &info) != nullptr);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x4000, &memory, &info));
+  ASSERT_TRUE(dex_file != nullptr);
 }
 
 TEST(DexFileTest, create_using_memory_file_is_malformed) {
@@ -162,13 +179,22 @@
   MemoryFake memory;
   memory.SetMemory(0x4000, kDexData, sizeof(kDexData));
   MapInfo info(nullptr, 0x4000, 0x10000, 0x200, 0x5, "/does/not/exist");
-  std::unique_ptr<DexFile> dex_file = DexFile::Create(0x4000, &memory, &info);
+  std::unique_ptr<DexFile> dex_file(DexFile::Create(0x4000, &memory, &info));
   ASSERT_TRUE(dex_file != nullptr);
 
   // Check it came from memory by clearing memory and verifying it fails.
   memory.Clear();
-  dex_file = DexFile::Create(0x4000, &memory, &info);
-  EXPECT_TRUE(dex_file == nullptr);
+  dex_file.reset(DexFile::Create(0x4000, &memory, &info));
+  ASSERT_TRUE(dex_file == nullptr);
+}
+
+TEST(DexFileTest, get_method_not_opened) {
+  std::string method("something");
+  uint64_t method_offset = 100;
+  DexFile dex_file;
+  dex_file.GetMethodInformation(0x100, &method, &method_offset);
+  EXPECT_EQ("something", method);
+  EXPECT_EQ(100U, method_offset);
 }
 
 TEST(DexFileTest, get_method) {