Hookup the generic heap intercept for Windows.

base/allocator/allocator_shim.cc

 // 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.
 
 #include "base/allocator/allocator_shim.h"
 
 #include <errno.h>
-#include <unistd.h>
 
 #include <new>
 
 #include "base/atomicops.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 
+#if !defined(OS_WIN)
+#include <unistd.h>
+#else
+#include "base/allocator/allocator_impl_win.h"
+#endif
+
 // No calls to malloc / new in this file. They would would cause re-entrancy of
 // the shim, which is hard to deal with. Keep this code as simple as possible
 // and don't use any external C++ object here, not even //base ones. Even if
 // they are safe to use today, in future they might be refactored.
 
 namespace {
 
 using namespace base;
 
 subtle::AtomicWord g_chain_head = reinterpret_cast<subtle::AtomicWord>(
     &allocator::AllocatorDispatch::default_dispatch);
 
 bool g_call_new_handler_on_malloc_failure = false;
 subtle::Atomic32 g_new_handler_lock = 0;
 
 // In theory this should be just base::ThreadChecker. But we can't afford
 // the luxury of a LazyInstance<ThreadChecker> here as it would cause a new().
 bool CalledOnValidThread() {
   using subtle::Atomic32;
   const Atomic32 kInvalidTID = static_cast<Atomic32>(kInvalidThreadId);
   static Atomic32 g_tid = kInvalidTID;
   Atomic32 cur_tid = static_cast<Atomic32>(PlatformThread::CurrentId());
   Atomic32 prev_tid =
       subtle::NoBarrier_CompareAndSwap(&g_tid, kInvalidTID, cur_tid);
   return prev_tid == kInvalidTID || prev_tid == cur_tid;
 }
 
 inline size_t GetPageSize() {
+#if defined(OS_WIN)
+  return 4096;
+#else
   static size_t pagesize = 0;
   if (!pagesize)
     pagesize = sysconf(_SC_PAGESIZE);
   return pagesize;
+#endif
 }
 
 // Calls the std::new handler thread-safely. Returns true if a new_handler was
 // set and called, false if no new_handler was set.
-bool CallNewHandler() {
+bool CallNewHandler(size_t size) {
+#if defined(OS_WIN)
+  return base::allocator::WinCallNewHandler(size);
+#else
   // TODO(primiano): C++11 has introduced ::get_new_handler() which is supposed
   // to be thread safe and would avoid the spinlock boilerplate here. However
   // it doesn't seem to be available yet in the Linux chroot headers yet.
   std::new_handler nh;
   {
     while (subtle::Acquire_CompareAndSwap(&g_new_handler_lock, 0, 1))
       PlatformThread::YieldCurrentThread();
     nh = std::set_new_handler(0);
     ignore_result(std::set_new_handler(nh));
     subtle::Release_Store(&g_new_handler_lock, 0);
   }
   if (!nh)
     return false;
   (*nh)();
   // Assume the new_handler will abort if it fails. Exception are disabled and
   // we don't support the case of a new_handler throwing std::bad_balloc.
   return true;
+#endif
 }
 
 inline const allocator::AllocatorDispatch* GetChainHead() {
   // TODO(primiano): Just use NoBarrier_Load once crbug.com/593344 is fixed.
   // Unfortunately due to that bug NoBarrier_Load() is mistakenly fully
   // barriered on Linux+Clang, and that causes visible perf regressons.
   return reinterpret_cast<const allocator::AllocatorDispatch*>(
 #if defined(OS_LINUX) && defined(__clang__)
       *static_cast<const volatile subtle::AtomicWord*>(&g_chain_head)
 #else
@@ skipping 59 matching lines @@
 //   - If the std::new_handler is set:
 //     - Assume it will abort() if it fails (very likely the new_handler will
 //       just suicide priting a message).
 //     - Assume it did succeed if it returns, in which case reattempt the alloc.
 
 void* ShimCppNew(size_t size) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   void* ptr;
   do {
     ptr = chain_head->alloc_function(chain_head, size);
-  } while (!ptr && CallNewHandler());
+  } while (!ptr && CallNewHandler(size));
   return ptr;
 }
 
 void ShimCppDelete(void* address) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   return chain_head->free_function(chain_head, address);
 }
 
 void* ShimMalloc(size_t size) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   void* ptr;
   do {
     ptr = chain_head->alloc_function(chain_head, size);
-  } while (!ptr && g_call_new_handler_on_malloc_failure && CallNewHandler());
+  } while (!ptr && g_call_new_handler_on_malloc_failure &&
+           CallNewHandler(size));
   return ptr;
 }
 
 void* ShimCalloc(size_t n, size_t size) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   void* ptr;
   do {
     ptr = chain_head->alloc_zero_initialized_function(chain_head, n, size);
-  } while (!ptr && g_call_new_handler_on_malloc_failure && CallNewHandler());
+  } while (!ptr && g_call_new_handler_on_malloc_failure &&
+           CallNewHandler(size));
   return ptr;
 }
 
 void* ShimRealloc(void* address, size_t size) {
   // realloc(size == 0) means free() and might return a nullptr. We should
   // not call the std::new_handler in that case, though.
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   void* ptr;
   do {
     ptr = chain_head->realloc_function(chain_head, address, size);
   } while (!ptr && size && g_call_new_handler_on_malloc_failure &&
-           CallNewHandler());
+           CallNewHandler(size));
   return ptr;
 }
 
 void* ShimMemalign(size_t alignment, size_t size) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   void* ptr;
   do {
     ptr = chain_head->alloc_aligned_function(chain_head, alignment, size);
-  } while (!ptr && g_call_new_handler_on_malloc_failure && CallNewHandler());
+  } while (!ptr && g_call_new_handler_on_malloc_failure &&
+           CallNewHandler(size));
   return ptr;
 }
 
 int ShimPosixMemalign(void** res, size_t alignment, size_t size) {
   // posix_memalign is supposed to check the arguments. See tc_posix_memalign()
   // in tc_malloc.cc.
   if (((alignment % sizeof(void*)) != 0) ||
       ((alignment & (alignment - 1)) != 0) || (alignment == 0)) {
     return EINVAL;
   }
@@ skipping 14 matching lines @@
     size = (size + GetPageSize() - 1) & ~(GetPageSize() - 1);
   }
   return ShimMemalign(GetPageSize(), size);
 }
 
 void ShimFree(void* address) {
   const allocator::AllocatorDispatch* const chain_head = GetChainHead();
   return chain_head->free_function(chain_head, address);
 }
 
+#if defined(OS_WIN)
+
+void* (*malloc_unchecked)(size_t) = &base::allocator::UncheckedAlloc;

[Sigurður Ásgeirsson, 2016/07/11 19:51:51]

I'm unhappy about putting this code here for some reason, but maybe this is OK?

+
+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;
+}
+
+#endif
+
 }  // extern "C"
 
+#if !defined(OS_WIN)

[Sigurður Ásgeirsson, 2016/07/11 19:51:51]

this needs a different implementation on Win, as per the libc intercepts, as I
don't think the link-time name aliasing trick is available on Win.

 // Cpp symbols (new / delete) should always be routed through the shim layer.
 #include "base/allocator/allocator_shim_override_cpp_symbols.h"
+#endif
 
 // Android does not support symbol interposition. The way malloc symbols are
 // intercepted on Android is by using link-time -wrap flags.
 #if !defined(OS_ANDROID)
 // Ditto for plain malloc() / calloc() / free() etc. symbols.
 #include "base/allocator/allocator_shim_override_libc_symbols.h"
 #else
 #include "base/allocator/allocator_shim_override_linker_wrapped_symbols.h"
 #endif
 
 // In the case of tcmalloc we also want to plumb into the glibc hooks
 // to avoid that allocations made in glibc itself (e.g., strdup()) get
 // accidentally performed on the glibc heap instead of the tcmalloc one.
 #if defined(USE_TCMALLOC)
 #include "base/allocator/allocator_shim_override_glibc_weak_symbols.h"
 #endif
 
 // Cross-checks.
 
 #if defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
 #error The allocator shim should not be compiled when building for memory tools.
 #endif
 
 #if (defined(__GNUC__) && defined(__EXCEPTIONS)) || \
     (defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS)
 #error This code cannot be used when exceptions are turned on.
 #endif