1 files changed, 137 insertions, 0 deletions
diff --git a/base/allocator/generic_allocators.cc b/base/allocator/generic_allocators.cc
new file mode 100644
index 0000000..6ea36ec
--- /dev/null
+++ b/base/allocator/generic_allocators.cc
@@ -0,0 +1,137 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// When possible, we implement allocator functions on top of the basic
+// low-level functions malloc() and free().  This way, including a new
+// allocator is as simple as providing just a small interface.
+//
+// As such, this file should not contain any allocator-specific code.
+
+// Implement a C++ style allocation, which always calls the new_handler
+// on failure.
+inline void* generic_cpp_alloc(size_t size, bool nothrow) {
+  void* ptr;
+  for (;;) {
+    ptr = malloc(size);
+    if (ptr)
+      return ptr;
+    if (!call_new_handler(nothrow))
+      break;
+  }
+  return ptr;
+}
+
+extern "C++" {
+
+void* __cdecl operator new(size_t size) {
+  return generic_cpp_alloc(size, false);
+}
+
+void operator delete(void* p) __THROW {
+  free(p);
+}
+
+void* operator new[](size_t size) {
+  return generic_cpp_alloc(size, false);
+}
+
+void operator delete[](void* p) __THROW {
+  free(p);
+}
+
+void* operator new(size_t size, const std::nothrow_t& nt) __THROW {
+  return generic_cpp_alloc(size, true);
+}
+
+void* operator new[](size_t size, const std::nothrow_t& nt) __THROW {
+  return generic_cpp_alloc(size, true);
+}
+
+// This function behaves similarly to MSVC's _set_new_mode.
+// If flag is 0 (default), calls to malloc will behave normally.
+// If flag is 1, calls to malloc will behave like calls to new,
+// and the std_new_handler will be invoked on failure.
+// Returns the previous mode.
+int _set_new_mode(int flag) __THROW {
+  int old_mode = new_mode;
+  new_mode = flag;
+  return old_mode;
+}
+
+}  // extern "C++"
+
+extern "C" {
+
+void* calloc(size_t n, size_t elem_size) __THROW {
+  // Overflow check
+  const size_t size = n * elem_size;
+  if (elem_size != 0 && size / elem_size != n) return NULL;
+
+  void* result = malloc(size);
+  if (result != NULL) {
+    memset(result, 0, size);
+  }
+  return result;
+}
+
+void cfree(void* p) __THROW {
+  free(p);
+}
+
+#ifdef WIN32
+
+void* _recalloc(void* p, size_t n, size_t elem_size) {
+  if (!p)
+    return calloc(n, elem_size);
+
+  // This API is a bit odd.
+  // Note: recalloc only guarantees zeroed memory when p is NULL.
+  //   Generally, calls to malloc() have padding.  So a request
+  //   to malloc N bytes actually malloc's N+x bytes.  Later, if
+  //   that buffer is passed to recalloc, we don't know what N
+  //   was anymore.  We only know what N+x is.  As such, there is
+  //   no way to know what to zero out.
+  const size_t size = n * elem_size;
+  if (elem_size != 0 && size / elem_size != n) return NULL;
+  return realloc(p, size);
+}
+
+void* _calloc_impl(size_t n, size_t size) {
+  return calloc(n, size);
+}
+
+#ifndef NDEBUG
+#undef malloc
+#undef free
+#undef calloc
+int _CrtDbgReport(int, const char*, int, const char*, const char*, ...) {
+  return 0;
+}
+
+int _CrtDbgReportW(int, const wchar_t*, int, const wchar_t*,
+                   const wchar_t*, ...) {
+  return 0;
+}
+
+int _CrtSetReportMode(int, int) {
+  return 0;
+}
+
+void* _malloc_dbg(size_t size, int , const char*, int) {
+  return malloc(size);
+}
+
+void _free_dbg(void* ptr, int) {
+  free(ptr);
+}
+
+void* _calloc_dbg(size_t n, size_t size, int, const char*, int) {
+  return calloc(n, size);
+}
+#endif  // NDEBUG
+
+#endif  // WIN32
+
+}  // extern C
+