зеркало из https://github.com/mozilla/gecko-dev.git
53 строки
1.7 KiB
C++
53 строки
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ProfilerCodeAddressService_h
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#define ProfilerCodeAddressService_h
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#include "CodeAddressService.h"
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#include "nsTArray.h"
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namespace mozilla {
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// This SymbolTable struct, and the CompactSymbolTable struct in the
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// profiler rust module, have the exact same memory layout.
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// nsTArray and ThinVec are FFI-compatible, because the thin-vec crate is
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// being compiled with the "gecko-ffi" feature enabled.
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struct SymbolTable {
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SymbolTable() = default;
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SymbolTable(SymbolTable&& aOther) = default;
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nsTArray<uint32_t> mAddrs;
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nsTArray<uint32_t> mIndex;
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nsTArray<uint8_t> mBuffer;
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};
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} // namespace mozilla
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/**
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* Cache and look up function symbol names.
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*
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* We don't template this on AllocPolicy since we need to use nsTArray in
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* SymbolTable above, which doesn't work with AllocPolicy. (We can't switch
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* to Vector, as we would lose FFI compatibility with ThinVec.)
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*/
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class ProfilerCodeAddressService : public mozilla::CodeAddressService<> {
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public:
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// Like GetLocation, but only returns the symbol name.
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bool GetFunction(const void* aPc, nsACString& aResult);
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private:
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#if defined(XP_LINUX) || defined(XP_FREEBSD)
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// Map of library names (owned by mLibraryStrings) to SymbolTables filled
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// in by profiler_get_symbol_table.
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mozilla::HashMap<const char*, mozilla::SymbolTable,
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mozilla::DefaultHasher<const char*>, AllocPolicy>
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mSymbolTables;
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#endif
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};
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#endif // ProfilerCodeAddressService_h
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