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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
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