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-rw-r--r--tools/profiler/public/ProfilerCodeAddressService.h52
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diff --git a/tools/profiler/public/ProfilerCodeAddressService.h b/tools/profiler/public/ProfilerCodeAddressService.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 ProfilerCodeAddressService_h
+#define ProfilerCodeAddressService_h
+
+#include "CodeAddressService.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+// This SymbolTable struct, and the CompactSymbolTable struct in the
+// profiler rust module, have the exact same memory layout.
+// nsTArray and ThinVec are FFI-compatible, because the thin-vec crate is
+// being compiled with the "gecko-ffi" feature enabled.
+struct SymbolTable {
+ SymbolTable() = default;
+ SymbolTable(SymbolTable&& aOther) = default;
+
+ nsTArray<uint32_t> mAddrs;
+ nsTArray<uint32_t> mIndex;
+ nsTArray<uint8_t> mBuffer;
+};
+
+} // namespace mozilla
+
+/**
+ * Cache and look up function symbol names.
+ *
+ * We don't template this on AllocPolicy since we need to use nsTArray in
+ * SymbolTable above, which doesn't work with AllocPolicy. (We can't switch
+ * to Vector, as we would lose FFI compatibility with ThinVec.)
+ */
+class ProfilerCodeAddressService : public mozilla::CodeAddressService<> {
+ public:
+ // Like GetLocation, but only returns the symbol name.
+ bool GetFunction(const void* aPc, nsACString& aResult);
+
+ private:
+#if defined(XP_LINUX) || defined(XP_FREEBSD)
+ // Map of library names (owned by mLibraryStrings) to SymbolTables filled
+ // in by profiler_get_symbol_table.
+ mozilla::HashMap<const char*, mozilla::SymbolTable,
+ mozilla::DefaultHasher<const char*>, AllocPolicy>
+ mSymbolTables;
+#endif
+};
+
+#endif // ProfilerCodeAddressService_h