Improve detection of already loaded libraries

Linker is now able to resolve symlinked libraries correctly.

soinfo is extended to save the graph of dependencies during
load/unload. Dependencies are used only in CallConstructor.

Bug: 9741592
Change-Id: Id9c48a74c46aa89bcdf3d54ec2f8ba3d398130b1

2 files changed, 98 insertions, 0 deletions

diff --git a/linker/tests/Android.mk b/linker/tests/Android.mk
index 600fe69..831cfcb 100644
--- a/linker/tests/Android.mk
+++ b/linker/tests/Android.mk
@@ -30,6 +30,7 @@ LOCAL_CFLAGS += -g -Wall -Wextra -Werror -std=gnu++11
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../libc/
 
 LOCAL_SRC_FILES := \
+  linked_list_test.cpp \
   linker_allocator_test.cpp \
   ../linker_allocator.cpp
 
diff --git a/linker/tests/linked_list_test.cpp b/linker/tests/linked_list_test.cpp
new file mode 100644
index 0000000..31ec7d5
--- /dev/null
+++ b/linker/tests/linked_list_test.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2013 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 <stdlib.h>
+#include <string>
+#include <sstream>
+
+#include <gtest/gtest.h>
+
+#include "../linked_list.h"
+
+namespace {
+
+bool alloc_called = false;
+bool free_called = false;
+
+class LinkedListTestAllocator {
+ public:
+  typedef LinkedListEntry<const char> entry_t;
+
+  static entry_t* alloc() {
+    alloc_called = true;
+    return reinterpret_cast<entry_t*>(::malloc(sizeof(entry_t)));
+  }
+
+  static void free(entry_t* p) {
+    free_called = true;
+    ::free(p);
+  }
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(LinkedListTestAllocator);
+};
+
+typedef LinkedList<const char, LinkedListTestAllocator> test_list_t;
+
+std::string test_list_to_string(test_list_t& list) {
+  std::stringstream ss;
+  list.for_each([&] (const char* c) {
+    ss << c;
+  });
+
+  return ss.str();
+}
+
+};
+
+TEST(linked_list, simple) {
+  alloc_called = free_called = false;
+  test_list_t list;
+  ASSERT_EQ("", test_list_to_string(list));
+  ASSERT_TRUE(!alloc_called);
+  ASSERT_TRUE(!free_called);
+  list.push_front("a");
+  ASSERT_TRUE(alloc_called);
+  ASSERT_TRUE(!free_called);
+  ASSERT_EQ("a", test_list_to_string(list));
+  list.push_front("b");
+  ASSERT_EQ("ba", test_list_to_string(list));
+  list.push_front("c");
+  list.push_front("d");
+  ASSERT_EQ("dcba", test_list_to_string(list));
+  ASSERT_TRUE(alloc_called);
+  ASSERT_TRUE(!free_called);
+  alloc_called = free_called = false;
+  list.remove_if([] (const char* c) {
+    return *c == 'c';
+  });
+
+  ASSERT_TRUE(!alloc_called);
+  ASSERT_TRUE(!free_called);
+
+  ASSERT_EQ("dba", test_list_to_string(list));
+  alloc_called = free_called = false;
+  list.remove_if([] (const char* c) {
+    return *c == '2';
+  });
+  ASSERT_TRUE(!alloc_called);
+  ASSERT_TRUE(!free_called);
+  ASSERT_EQ("dba", test_list_to_string(list));
+  list.clear();
+  ASSERT_TRUE(!alloc_called);
+  ASSERT_TRUE(free_called);
+  ASSERT_EQ("", test_list_to_string(list));
+}