General purpose memory allocator for linker.

 Add basic general purpose memory allocator to
 linker in order to enable usage of other libraries
 like libziparchive.

Change-Id: I4a680ebb36ed5ba67c61249f81dba9f567808434

2 files changed, 199 insertions, 1 deletions

diff --git a/linker/tests/Android.mk b/linker/tests/Android.mk
index 9a08bec..35992c5 100644
--- a/linker/tests/Android.mk
+++ b/linker/tests/Android.mk
@@ -29,6 +29,11 @@ LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../libc/
 LOCAL_SRC_FILES := \
   linked_list_test.cpp \
   linker_block_allocator_test.cpp \
-  ../linker_block_allocator.cpp
+  ../linker_block_allocator.cpp \
+  linker_memory_allocator_test.cpp \
+  ../linker_allocator.cpp
+
+# for __libc_fatal
+LOCAL_SRC_FILES += ../../libc/bionic/libc_logging.cpp
 
 include $(BUILD_NATIVE_TEST)
diff --git a/linker/tests/linker_memory_allocator_test.cpp b/linker/tests/linker_memory_allocator_test.cpp
new file mode 100644
index 0000000..f002a0d
--- /dev/null
+++ b/linker/tests/linker_memory_allocator_test.cpp
@@ -0,0 +1,193 @@
+/*
+ * 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.h>
+#include <sys/mman.h>
+
+#include <gtest/gtest.h>
+
+#include "../linker_allocator.h"
+
+#include <unistd.h>
+
+namespace {
+
+/*
+ * this one has size below allocator cap which is 2*sizeof(void*)
+ */
+struct test_struct_small {
+  char dummy_str[5];
+};
+
+struct test_struct_large {
+  char dummy_str[1009];
+};
+
+struct test_struct_huge {
+  char dummy_str[73939];
+};
+
+struct test_struct_512 {
+  char dummy_str[503];
+};
+
+};
+
+static size_t kPageSize = sysconf(_SC_PAGE_SIZE);
+
+TEST(linker_memory, test_alloc_0) {
+  LinkerMemoryAllocator allocator;
+  void* ptr = allocator.alloc(0);
+  ASSERT_TRUE(ptr != nullptr);
+  free(ptr);
+}
+
+TEST(linker_memory, test_free_nullptr) {
+  LinkerMemoryAllocator allocator;
+  allocator.free(nullptr);
+}
+
+TEST(linker_memory, test_realloc) {
+  LinkerMemoryAllocator allocator;
+  uint32_t* array = reinterpret_cast<uint32_t*>(allocator.alloc(512));
+  const size_t array_size = 512 / sizeof(uint32_t);
+
+  uint32_t model[1000];
+
+  model[0] = 1;
+  model[1] = 1;
+
+  for (size_t i = 2; i < 1000; ++i) {
+    model[i] = model[i - 1] + model[i - 2];
+  }
+
+  memcpy(array, model, array_size);
+
+  uint32_t* reallocated_ptr = reinterpret_cast<uint32_t*>(allocator.realloc(array, 1024));
+
+  ASSERT_TRUE(reallocated_ptr != nullptr);
+  ASSERT_TRUE(reallocated_ptr != array);
+
+  ASSERT_TRUE(memcmp(reallocated_ptr, model, array_size) == 0);
+
+  array = reallocated_ptr;
+
+  memcpy(array, model, 2*array_size);
+
+  reallocated_ptr = reinterpret_cast<uint32_t*>(allocator.realloc(array, 62));
+
+  ASSERT_TRUE(reallocated_ptr == array);
+
+  reallocated_ptr = reinterpret_cast<uint32_t*>(allocator.realloc(array, 4000));
+
+  ASSERT_TRUE(reallocated_ptr != nullptr);
+  ASSERT_TRUE(reallocated_ptr != array);
+
+  ASSERT_TRUE(memcmp(reallocated_ptr, model, array_size * 2) == 0);
+
+  array = reallocated_ptr;
+
+  memcpy(array, model, 4000);
+
+  reallocated_ptr = reinterpret_cast<uint32_t*>(allocator.realloc(array, 64000));
+
+  ASSERT_TRUE(reallocated_ptr != nullptr);
+  ASSERT_TRUE(reallocated_ptr != array);
+
+  ASSERT_TRUE(memcmp(reallocated_ptr, model, 4000) == 0);
+
+  ASSERT_EQ(nullptr, realloc(reallocated_ptr, 0));
+}
+
+TEST(linker_memory, test_small_smoke) {
+  LinkerMemoryAllocator allocator;
+
+  uint8_t zeros[16];
+  memset(zeros, 0, sizeof(zeros));
+
+  test_struct_small* ptr1 =
+      reinterpret_cast<test_struct_small*>(allocator.alloc(sizeof(test_struct_small)));
+  test_struct_small* ptr2 =
+      reinterpret_cast<test_struct_small*>(allocator.alloc(sizeof(test_struct_small)));
+
+  ASSERT_TRUE(ptr1 != nullptr);
+  ASSERT_TRUE(ptr2 != nullptr);
+  ASSERT_EQ(reinterpret_cast<uintptr_t>(ptr1)+16, reinterpret_cast<uintptr_t>(ptr2));
+  ASSERT_TRUE(memcmp(ptr1, zeros, 16) == 0);
+
+  allocator.free(ptr1);
+  allocator.free(ptr2);
+}
+
+TEST(linker_memory, test_huge_smoke) {
+  LinkerMemoryAllocator allocator;
+
+  // this should trigger proxy-to-mmap
+  test_struct_huge* ptr1 =
+      reinterpret_cast<test_struct_huge*>(allocator.alloc(sizeof(test_struct_huge)));
+  test_struct_huge* ptr2 =
+      reinterpret_cast<test_struct_huge*>(allocator.alloc(sizeof(test_struct_huge)));
+
+  ASSERT_TRUE(ptr1 != nullptr);
+  ASSERT_TRUE(ptr2 != nullptr);
+
+  ASSERT_TRUE(
+      reinterpret_cast<uintptr_t>(ptr1)/kPageSize != reinterpret_cast<uintptr_t>(ptr2)/kPageSize);
+  allocator.free(ptr2);
+  allocator.free(ptr1);
+}
+
+TEST(linker_memory, test_large) {
+  LinkerMemoryAllocator allocator;
+
+  test_struct_large* ptr1 =
+      reinterpret_cast<test_struct_large*>(allocator.alloc(sizeof(test_struct_large)));
+  test_struct_large* ptr2 =
+      reinterpret_cast<test_struct_large*>(allocator.alloc(1024));
+
+  ASSERT_TRUE(ptr1 != nullptr);
+  ASSERT_TRUE(ptr2 != nullptr);
+
+  ASSERT_EQ(reinterpret_cast<uintptr_t>(ptr1) + 1024, reinterpret_cast<uintptr_t>(ptr2));
+
+  // let's allocate until we reach the next page.
+  size_t n = kPageSize / sizeof(test_struct_large) + 1 - 2;
+  test_struct_large* objects[n];
+
+  for (size_t i = 0; i < n; ++i) {
+    test_struct_large* obj_ptr =
+        reinterpret_cast<test_struct_large*>(allocator.alloc(sizeof(test_struct_large)));
+    ASSERT_TRUE(obj_ptr != nullptr);
+    objects[i] = obj_ptr;
+  }
+
+  test_struct_large* ptr_to_free =
+      reinterpret_cast<test_struct_large*>(allocator.alloc(sizeof(test_struct_large)));
+
+  ASSERT_TRUE(ptr_to_free != nullptr);
+
+  allocator.free(ptr1);
+
+  for (size_t i=0; i<n; ++i) {
+    allocator.free(objects[i]);
+  }
+
+  allocator.free(ptr2);
+  allocator.free(ptr_to_free);
+}
+
+