1 files changed, 135 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/other/ProcessedStack.h b/toolkit/components/telemetry/other/ProcessedStack.h
new file mode 100644
index 0000000000..375cab37a7
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+++ b/toolkit/components/telemetry/other/ProcessedStack.h
@@ -0,0 +1,135 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef ProcessedStack_h__
+#define ProcessedStack_h__
+
+#include <vector>
+
+#include "ipc/IPCMessageUtils.h"
+#include "ipc/IPCMessageUtilsSpecializations.h"
+#include "mozilla/ipc/MessageChannel.h"
+#include "mozilla/Vector.h"
+#include "nsStringFwd.h"
+#include "shared-libraries.h"
+
+namespace mozilla {
+namespace Telemetry {
+
+// This class represents a stack trace and the modules referenced in that trace.
+// It is designed to be easy to read and write to disk or network and doesn't
+// include any logic on how to collect or read the information it stores.
+class ProcessedStack {
+ public:
+  ProcessedStack();
+  size_t GetStackSize() const;
+  size_t GetNumModules() const;
+
+  struct Frame {
+    // The offset of this program counter in its module or an absolute pc.
+    uintptr_t mOffset;
+    // The index to pass to GetModule to get the module this program counter
+    // was in.
+    uint16_t mModIndex;
+  };
+  struct Module {
+    // The file name, /foo/bar/libxul.so for example.
+    // It can contain unicode characters.
+    nsString mName;
+    nsCString mBreakpadId;
+
+    bool operator==(const Module& other) const;
+  };
+
+  const Frame& GetFrame(unsigned aIndex) const;
+  void AddFrame(const Frame& aFrame);
+  const Module& GetModule(unsigned aIndex) const;
+  void AddModule(const Module& aFrame);
+
+  void Clear();
+
+ private:
+  std::vector<Module> mModules;
+  std::vector<Frame> mStack;
+};
+
+// Get the current list of loaded modules, filter and pair it to the provided
+// stack. We let the caller collect the stack since different callers have
+// different needs (current thread X main thread, stopping the thread, etc).
+ProcessedStack GetStackAndModules(const std::vector<uintptr_t>& aPCs);
+
+// This class optimizes repeated calls to GetStackAndModules.
+class BatchProcessedStackGenerator {
+ public:
+  BatchProcessedStackGenerator();
+  ProcessedStack GetStackAndModules(const std::vector<uintptr_t>& aPCs);
+
+  template <typename AllocatorPolicy>
+  ProcessedStack GetStackAndModules(
+      const Vector<void*, 0, AllocatorPolicy>& aPCs) {
+    return GetStackAndModules(reinterpret_cast<const uintptr_t*>(aPCs.begin()),
+                              reinterpret_cast<const uintptr_t*>(aPCs.end()));
+  }
+
+ private:
+  ProcessedStack GetStackAndModules(const uintptr_t* aBegin,
+                                    const uintptr_t* aEnd);
+#if defined(MOZ_GECKO_PROFILER)
+  SharedLibraryInfo mSortedRawModules;
+#endif
+};
+
+}  // namespace Telemetry
+}  // namespace mozilla
+
+namespace IPC {
+
+template <>
+struct ParamTraits<mozilla::Telemetry::ProcessedStack::Module> {
+  typedef mozilla::Telemetry::ProcessedStack::Module paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam) {
+    WriteParam(aWriter, aParam.mName);
+    WriteParam(aWriter, aParam.mBreakpadId);
+  }
+
+  static bool Read(MessageReader* aReader, paramType* aResult) {
+    if (!ReadParam(aReader, &aResult->mName)) {
+      return false;
+    }
+
+    if (!ReadParam(aReader, &aResult->mBreakpadId)) {
+      return false;
+    }
+
+    return true;
+  }
+};
+
+template <>
+struct ParamTraits<mozilla::Telemetry::ProcessedStack::Frame> {
+  typedef mozilla::Telemetry::ProcessedStack::Frame paramType;
+
+  static void Write(MessageWriter* aWriter, const paramType& aParam) {
+    WriteParam(aWriter, aParam.mOffset);
+    WriteParam(aWriter, aParam.mModIndex);
+  }
+
+  static bool Read(MessageReader* aReader, paramType* aResult) {
+    if (!ReadParam(aReader, &aResult->mOffset)) {
+      return false;
+    }
+
+    if (!ReadParam(aReader, &aResult->mModIndex)) {
+      return false;
+    }
+
+    return true;
+  }
+};
+
+}  // namespace IPC
+
+#endif  // ProcessedStack_h__