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+// Copyright 2013 Google LLC
+//
+// 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 LLC 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.
+
+/* stackwalker_riscv64.h: riscv64-specific stackwalker.
+ *
+ * Provides stack frames given riscv64 register context and a memory region
+ * corresponding to a riscv64 stack.
+ *
+ * Author: Iacopo Colonnelli
+ */
+
+#ifndef PROCESSOR_STACKWALKER_RISCV64_H__
+#define PROCESSOR_STACKWALKER_RISCV64_H__
+
+#include "google_breakpad/common/minidump_format.h"
+#include "google_breakpad/processor/stackwalker.h"
+
+namespace google_breakpad {
+
+class CodeModules;
+
+class StackwalkerRISCV64 : public Stackwalker {
+public:
+  // Context is a riscv context object that gives access to riscv-specific
+  // register state corresponding to the innermost called frame to be
+  // included in the stack.  The other arguments are passed directly
+  // through to the base Stackwalker constructor.
+  StackwalkerRISCV64(const SystemInfo* system_info,
+                     const MDRawContextRISCV64* context,
+                     MemoryRegion* memory,
+                     const CodeModules* modules,
+                     StackFrameSymbolizer* frame_symbolizer);
+
+  // Change the context validity mask of the frame returned by
+  // GetContextFrame to VALID. This is only for use by unit tests; the
+  // default behavior is correct for all application code.
+  void SetContextFrameValidity(int valid) {
+    context_frame_validity_ = valid;
+  }
+
+private:
+  // Implementation of Stackwalker, using riscv context and stack conventions.
+  virtual StackFrame* GetContextFrame();
+  virtual StackFrame* GetCallerFrame(
+      const CallStack* stack, bool stack_scan_allowed);
+
+  // Use cfi_frame_info (derived from STACK CFI records) to construct
+  // the frame that called frames.back(). The caller takes ownership
+  // of the returned frame. Return NULL on failure.
+  StackFrameRISCV64* GetCallerByCFIFrameInfo(
+      const vector<StackFrame*>& frames, CFIFrameInfo* cfi_frame_info);
+
+  // Use the frame pointer. The caller takes ownership of the returned frame.
+  // Return NULL on failure.
+  StackFrameRISCV64* GetCallerByFramePointer(
+      const vector<StackFrame*>& frames);
+
+  // Scan the stack for plausible return addresses. The caller takes ownership
+  // of the returned frame. Return NULL on failure.
+  StackFrameRISCV64* GetCallerByStackScan(
+      const vector<StackFrame*>& frames);
+
+  // Stores the CPU context corresponding to the innermost stack frame to
+  // be returned by GetContextFrame.
+  const MDRawContextRISCV64* context_;
+
+  // Validity mask for youngest stack frame. This is always
+  // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of
+  // unit tests.
+  int context_frame_validity_;
+};
+
+}  // namespace google_breakpad
+
+#endif // PROCESSOR_STACKWALKER_RISCV64_H__