Add AlignedVector and use it for vector<MEMORY_BASIC_INFORMATION64>

util/stdlib/aligned_allocator.cc

+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// 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 "util/stdlib/aligned_allocator.h"
+
+#include <algorithm>
+
+#include "build/build_config.h"
+
+#if defined(OS_POSIX)
+#include <stdlib.h>
+#elif defined(OS_WIN)
+#include <malloc.h>
+#include <xutility>

[scottmg, 2015/12/04 19:58:51]

_Xbad_alloc is only there in VS2012+ I think, but I guess we won't worry about
that. :)

+#endif  // OS_POSIX
+
+namespace {
+
+// Throws std::bad_alloc() by calling an internal function provided by the C++
+// library to do so. This works even if C++ exceptions are disabled, causing
+// program termination if uncaught.
+void ThrowBadAlloc() {
+#if defined(OS_POSIX)
+  // This works with both libc++ and libstdc++.
+  std::__throw_bad_alloc();
+#elif defined(OS_WIN)
+  std::_Xbad_alloc();
+#endif  // OS_POSIX
+}
+
+}  // namespace
+
+namespace crashpad {
+namespace internal {
+
+void* AlignedAllocate(size_t alignment, size_t size) {
+#if defined(OS_POSIX)
+  // posix_memalign() requires that alignment be at least sizeof(void*), so the
+  // power-of-2 check needs to happen before potentially changing the alignment.
+  if (alignment == 0 || alignment & (alignment - 1)) {
+    ThrowBadAlloc();
+  }
+
+  void* pointer;
+  if (posix_memalign(&pointer, std::max(alignment, sizeof(void*)), size) != 0) {
+    ThrowBadAlloc();
+  }
+#elif defined(OS_WIN)
+  void* pointer = _aligned_malloc(size, alignment);
+  if (pointer == nullptr) {
+    ThrowBadAlloc();
+  }
+#endif  // OS_POSIX
+
+  return pointer;
+}
+
+void AlignedFree(void* pointer) {
+#if defined(OS_POSIX)
+  free(pointer);
+#elif defined(OS_WIN)
+  _aligned_free(pointer);
+#endif  // OS_POSIX
+}
+
+}  // namespace internal
+}  // namespace crashpad