Hookup the generic heap intercept for Windows.

base/allocator/allocator_shim_override_ucrt_symbols_win.h

+// Copyright 2016 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.
+
+// This header defines symbols to override the same functions in the Visual C++
+// CRT implementation.
+
+#ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_UCRT_SYMBOLS_WIN_H_
+#error This header is meant to be included only once by allocator_shim.cc
+#endif
+#define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_UCRT_SYMBOLS_WIN_H_
+
+#include <malloc.h>
+
+extern "C" {
+
+void* (*malloc_unchecked)(size_t) = &base::allocator::UncheckedAlloc;
+
+namespace {
+
+int win_new_mode = 0;
+
+}  // namespace
+
+// 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.
+//
+// Replaces _set_new_mode in ucrt\heap\new_mode.cpp
+int _set_new_mode(int flag) {
+  // The MS CRT calls this function early on in startup, so this serves as a low
+  // overhead proof that the allocator shim is in place for this process.
+  base::allocator::g_is_win_shim_layer_initialized = true;
+  int old_mode = win_new_mode;
+  win_new_mode = flag;
+
+  base::allocator::SetCallNewHandlerOnMallocFailure(win_new_mode != 0);
+
+  return old_mode;
+}
+
+// Replaces _query_new_mode in ucrt\heap\new_mode.cpp
+int _query_new_mode() {
+  return win_new_mode;
+}
+
+// These symbols override the CRT's implementation of the same functions.
+__declspec(restrict) void* malloc(size_t size) {
+  return ShimMalloc(size);
+}
+
+void free(void* ptr) {
+  ShimFree(ptr);
+}
+
+__declspec(restrict) void* realloc(void* ptr, size_t size) {
+  return ShimRealloc(ptr, size);
+}
+
+__declspec(restrict) void* calloc(size_t n, size_t size) {
+  return ShimCalloc(n, size);
+}
+
+// The default dispatch translation unit has to define also the following
+// symbols (unless they are ultimately routed to the system symbols):
+//   void malloc_stats(void);
+//   int mallopt(int, int);
+//   struct mallinfo mallinfo(void);
+//   size_t malloc_size(void*);
+//   size_t malloc_usable_size(const void*);
+
+}  // extern "C"