win: Implement exception snapshot

util/win/nt_internals.cc

Index: util/win/nt_internals.cc
diff --git a/util/win/nt_internals.cc b/util/win/nt_internals.cc
new file mode 100644
index 0000000000000000000000000000000000000000..01f889b95f492e2017116ff9e7e4429eb3298046
--- /dev/null
+++ b/util/win/nt_internals.cc
@@ -0,0 +1,91 @@
+// 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/win/nt_internals.h"
+
+#include "base/logging.h"
+
+namespace crashpad {
+
+NTSTATUS NtQuerySystemInformation(
+    SYSTEM_INFORMATION_CLASS system_information_class,
+    PVOID system_information,
+    ULONG system_information_length,
+    PULONG return_length) {
+  static decltype(::NtQuerySystemInformation)* nt_query_system_information =
+      reinterpret_cast<decltype(::NtQuerySystemInformation)*>(GetProcAddress(
+          LoadLibrary(L"ntdll.dll"), "NtQuerySystemInformation"));
+  DCHECK(nt_query_system_information);
+  return nt_query_system_information(system_information_class,
+                                     system_information,
+                                     system_information_length,
+                                     return_length);
+}
+
+NTSTATUS NtQueryInformationThread(HANDLE thread_handle,
+                                  THREADINFOCLASS thread_information_class,
+                                  PVOID thread_information,
+                                  ULONG thread_information_length,
+                                  PULONG return_length) {
+  static decltype(::NtQueryInformationThread)* nt_query_information_thread =
+      reinterpret_cast<decltype(::NtQueryInformationThread)*>(GetProcAddress(
+          LoadLibrary(L"ntdll.dll"), "NtQueryInformationThread"));
+  DCHECK(nt_query_information_thread);
+  return nt_query_information_thread(thread_handle,
+                                     thread_information_class,
+                                     thread_information,
+                                     thread_information_length,
+                                     return_length);
+}
+
+// The 4th argument is CLIENT_ID*, but as we can't typedef that, we simply cast
+// to void* here.
+typedef NTSTATUS(WINAPI* NtOpenThreadFunction)(
+    PHANDLE ThreadHandle,
+    ACCESS_MASK DesiredAccess,
+    POBJECT_ATTRIBUTES ObjectAttributes,
+    const void* ClientId);
+
+template <class Traits>
+NTSTATUS NtOpenThread(PHANDLE thread_handle,
+                      ACCESS_MASK desired_access,
+                      POBJECT_ATTRIBUTES object_attributes,
+                      const process_types::CLIENT_ID<Traits>* client_id) {
+  static NtOpenThreadFunction nt_open_thread =
+      reinterpret_cast<NtOpenThreadFunction>(
+          GetProcAddress(LoadLibrary(L"ntdll.dll"), "NtOpenThread"));
+  DCHECK(nt_open_thread);
+  return nt_open_thread(thread_handle,
+                        desired_access,
+                        object_attributes,
+                        static_cast<const void*>(client_id));
+}
+
+// Explicit instantiations with the only 2 valid template arguments to avoid
+// putting the body of the function in the header.
+template NTSTATUS NtOpenThread<process_types::internal::Traits32>(
+    PHANDLE thread_handle,
+    ACCESS_MASK desired_access,
+    POBJECT_ATTRIBUTES object_attributes,
+    const process_types::CLIENT_ID<process_types::internal::Traits32>*
+        client_id);
+
+template NTSTATUS NtOpenThread<process_types::internal::Traits64>(
+    PHANDLE thread_handle,
+    ACCESS_MASK desired_access,
+    POBJECT_ATTRIBUTES object_attributes,
+    const process_types::CLIENT_ID<process_types::internal::Traits64>*
+        client_id);
+
+}  // namespace crashpad