Add MinidumpExceptionWriter and its test

minidump/minidump_exception_writer.cc

Index: minidump/minidump_exception_writer.cc
diff --git a/minidump/minidump_exception_writer.cc b/minidump/minidump_exception_writer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2a990f044932d47c7a56d18a1bfc143ad9b9ce19
--- /dev/null
+++ b/minidump/minidump_exception_writer.cc
@@ -0,0 +1,90 @@
+// Copyright 2014 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 "minidump/minidump_exception_writer.h"
+
+#include "base/logging.h"
+
+namespace crashpad {
+
+MinidumpExceptionWriter::MinidumpExceptionWriter()
+    : MinidumpStreamWriter(), exception_(), context_(NULL) {
+}
+
+void MinidumpExceptionWriter::SetContext(MinidumpContextWriter* context) {
+  DCHECK_EQ(state(), kStateMutable);
+
+  context_ = context;
+}
+
+void MinidumpExceptionWriter::SetExceptionInformation(
+    const std::vector<uint64_t>& exception_information) {
+  DCHECK_EQ(state(), kStateMutable);
+
+  const size_t parameters = exception_information.size();
+  const size_t kMaxParameters =
+      arraysize(exception_.ExceptionRecord.ExceptionInformation);
+  CHECK_LE(parameters, kMaxParameters);
+
+  exception_.ExceptionRecord.NumberParameters = parameters;
+  size_t parameter = 0;
+  for (; parameter < parameters; ++parameter) {
+    exception_.ExceptionRecord.ExceptionInformation[parameter] =
+        exception_information[parameter];
+  }
+  for (; parameter < kMaxParameters; ++parameter) {
+    exception_.ExceptionRecord.ExceptionInformation[parameter] = 0;
+  }
+}
+
+bool MinidumpExceptionWriter::Freeze() {
+  DCHECK_EQ(state(), kStateMutable);
+  CHECK(context_);
+
+  if (!MinidumpStreamWriter::Freeze()) {
+    return false;
+  }
+
+  context_->RegisterLocationDescriptor(&exception_.ThreadContext);
+
+  return true;
+}
+
+size_t MinidumpExceptionWriter::SizeOfObject() {
+  DCHECK_GE(state(), kStateFrozen);
+
+  return sizeof(exception_);
+}
+
+std::vector<internal::MinidumpWritable*> MinidumpExceptionWriter::Children() {
+  DCHECK_GE(state(), kStateFrozen);
+  DCHECK(context_);
+
+  std::vector<MinidumpWritable*> children;
+  children.push_back(context_);
+
+  return children;
+}
+
+bool MinidumpExceptionWriter::WriteObject(FileWriterInterface* file_writer) {
+  DCHECK_EQ(state(), kStateWritable);
+
+  return file_writer->Write(&exception_, sizeof(exception_));
+}
+
+MinidumpStreamType MinidumpExceptionWriter::StreamType() const {
+  return kMinidumpStreamTypeException;
+}
+
+}  // namespace crashpad