From: Dmitriy Ivanov <dimitry@google.com>
Date: Mon, 1 Sep 2014 23:15:52 +0000 (-0700)
Subject: Introduce size-based r/w allocators
X-Git-Tag: android-x86-7.1-r1~757^2~707^2
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=0cd83ebb0e9784827d9ec0a8028a710e73a28b2b;p=android-x86%2Fbionic.git

Introduce size-based r/w allocators

Change-Id: I75165fc392e5380124039e6db49b0f559c8a518e
---

diff --git a/linker/linker.cpp b/linker/linker.cpp
index 919f8c04a..16730d663 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -627,10 +627,42 @@ done:
     return nullptr;
 }
 
+// Each size has it's own allocator.
+template<size_t size>
+class SizeBasedAllocator {
+ public:
+  static void* alloc() {
+    return allocator_.alloc();
+  }
+
+  static void free(void* ptr) {
+    allocator_.free(ptr);
+  }
 
+ private:
+  static LinkerBlockAllocator allocator_;
+};
+
+template<size_t size>
+LinkerBlockAllocator SizeBasedAllocator<size>::allocator_(size);
+
+template<typename T>
+class TypeBasedAllocator {
+ public:
+  static T* alloc() {
+    return reinterpret_cast<T*>(SizeBasedAllocator<sizeof(T)>::alloc());
+  }
+
+  static void free(T* ptr) {
+    SizeBasedAllocator<sizeof(T)>::free(ptr);
+  }
+};
+
+template <typename T>
+using linked_list_t = LinkedList<T, TypeBasedAllocator<LinkedListEntry<T>>>;
+
+typedef linked_list_t<soinfo> SoinfoLinkedList;
 
-// Another soinfo list allocator to use in dlsym. We don't reuse
-// SoinfoListAllocator because it is write-protected most of the time.
 static LinkerAllocator<LinkedListEntry<soinfo>> g_soinfo_list_allocator_rw;
 class SoinfoListAllocatorRW {
  public:
@@ -646,8 +678,9 @@ class SoinfoListAllocatorRW {
 // This is used by dlsym(3).  It performs symbol lookup only within the
 // specified soinfo object and its dependencies in breadth first order.
 ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name) {
-  LinkedList<soinfo, SoinfoListAllocatorRW> visit_list;
-  LinkedList<soinfo, SoinfoListAllocatorRW> visited;
+  SoinfoLinkedList visit_list;
+  SoinfoLinkedList visited;
+
   visit_list.push_back(si);
   soinfo* current_soinfo;
   while ((current_soinfo = visit_list.pop_front()) != nullptr) {