Extract the exception record from the minidump

Change-Id: Ia622560960513e24b21184532f2272a09b9cdc95
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1986339
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>

src/google_breakpad/processor/exception_record.h

@@ -0,0 +1,124 @@
+// Copyright (c) 2019 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// exception_record.h: A snapshot of an exception record.
+//
+// Author: Ivan Penkov
+
+#ifndef THIRD_PARTY_BREAKPAD_SRC_GOOGLE_BREAKPAD_PROCESSOR_EXCEPTION_RECORD_H_
+#define THIRD_PARTY_BREAKPAD_SRC_GOOGLE_BREAKPAD_PROCESSOR_EXCEPTION_RECORD_H_
+
+#include <vector>
+
+namespace google_breakpad {
+
+// Additional argument that describes the exception.
+class ExceptionParameter {
+ public:
+  ExceptionParameter(uint64_t value, const string& description)
+      : value_(value), description_(description) {}
+  // Accessors. See the data declarations below.
+  uint64_t value() const { return value_; }
+  void set_value(uint64_t value) { value_ = value; }
+  const string& description() const { return description_; }
+  void set_description(const string& description) {
+    description_ = description;
+  }
+
+ private:
+  // Parameter value.
+  uint64_t value_;
+  // Human readable description/interpretation of the above value.
+  string description_;
+};
+
+// A snapshot of an exception record. Contains exception record details: code,
+// flags, address, parameters.
+class ExceptionRecord {
+ public:
+  // Accessors. See the data declarations below.
+  uint32_t code() const { return code_; }
+  const string& code_description() const { return code_description_; }
+  void set_code(uint32_t code, const string& description) {
+    code_ = code;
+    code_description_ = description;
+  }
+
+  uint32_t flags() const { return flags_; }
+  const string& flags_description() const { return flags_description_; }
+  void set_flags(uint32_t flags, const string& description) {
+    flags_ = flags;
+    flags_description_ = description;
+  }
+
+  uint64_t nested_exception_record_address() const {
+    return nested_exception_record_address_;
+  }
+  void set_nested_exception_record_address(
+      uint64_t nested_exception_record_address) {
+    nested_exception_record_address_ = nested_exception_record_address;
+  }
+
+  uint64_t address() const { return address_; }
+  void set_address(uint64_t address) { address_ = address; }
+
+  const std::vector<ExceptionParameter>* parameters() const {
+    return &parameters_;
+  }
+  void add_parameter(uint64_t value, const string& description) {
+    parameters_.push_back(ExceptionParameter(value, description));
+  }
+
+ private:
+  // Exception code.
+  uint32_t code_;
+  string code_description_;
+
+  // Exception flags.
+  uint32_t flags_;
+  string flags_description_;
+
+  // The address of an associated MDException structure. Exception records can
+  // be chained together to provide additional information when nested
+  // exceptions occur.
+  uint64_t nested_exception_record_address_;
+
+  // The memory address that caused the exception.  For data access errors,
+  // this will be the data address that caused the fault.  For code errors,
+  // this will be the address of the instruction that caused the fault.
+  uint64_t address_;
+
+  // An array of additional arguments that describe the exception.
+  std::vector<ExceptionParameter> parameters_;
+};
+
+}  // namespace google_breakpad
+
+
+#endif  // THIRD_PARTY_BREAKPAD_SRC_GOOGLE_BREAKPAD_PROCESSOR_EXCEPTION_RECORD_H_

src/google_breakpad/processor/process_state.h

@@ -40,6 +40,7 @@
 #include "common/using_std_string.h"
 #include "google_breakpad/common/breakpad_types.h"
 #include "google_breakpad/processor/code_modules.h"
+#include "google_breakpad/processor/exception_record.h"
 #include "google_breakpad/processor/minidump.h"
 #include "google_breakpad/processor/system_info.h"
 #include "processor/linked_ptr.h"
@@ -105,6 +106,7 @@ class ProcessState {
   uint64_t crash_address() const { return crash_address_; }
   string assertion() const { return assertion_; }
   int requesting_thread() const { return requesting_thread_; }
+  const ExceptionRecord* exception_record() const { return &exception_record_; }
   const vector<CallStack*>* threads() const { return &threads_; }
   const vector<MemoryRegion*>* thread_memory_regions() const {
     return &thread_memory_regions_;
@@ -166,6 +168,9 @@ class ProcessState {
   // indicating that the dump thread is not available.
   int requesting_thread_;
 
+  // Exception record details: code, flags, address, parameters.
+  ExceptionRecord exception_record_;
+
   // Stacks for each thread (except possibly the exception handler
   // thread) at the time of the crash.
   vector<CallStack*> threads_;

src/processor/minidump_processor.cc

@@ -116,6 +116,25 @@ ProcessResult MinidumpProcessor::Process(
 
     process_state->crash_reason_ = GetCrashReason(
         dump, &process_state->crash_address_);
+
+    process_state->exception_record_.set_code(
+        exception->exception()->exception_record.exception_code,
+        // TODO(ivanpe): Populate description.
+        /* description = */ "");
+    process_state->exception_record_.set_flags(
+        exception->exception()->exception_record.exception_flags,
+        // TODO(ivanpe): Populate description.
+        /* description = */ "");
+    process_state->exception_record_.set_nested_exception_record_address(
+        exception->exception()->exception_record.exception_record);
+    process_state->exception_record_.set_address(process_state->crash_address_);
+    for (uint32_t i = 0;
+         i < exception->exception()->exception_record.number_parameters; i++) {
+      process_state->exception_record_.add_parameter(
+          exception->exception()->exception_record.exception_information[i],
+          // TODO(ivanpe): Populate description.
+          /* description = */ "");
+    }
   }
 
   // This will just return an empty string if it doesn't exist.