mirror of
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85 lines
2.6 KiB
C++
85 lines
2.6 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 mozjemalloc_h
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#define mozjemalloc_h
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#include "mozjemalloc_types.h"
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#include "mozilla/MacroArgs.h"
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// Macro helpers
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#define MACRO_CALL(a, b) a b
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// Can't use macros recursively, so we need another one doing the same as above.
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#define MACRO_CALL2(a, b) a b
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#define ARGS_HELPER(name, ...) \
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MACRO_CALL2(MOZ_PASTE_PREFIX_AND_ARG_COUNT(name, ##__VA_ARGS__), \
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(__VA_ARGS__))
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#define TYPED_ARGS0()
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#define TYPED_ARGS1(t1) t1 arg1
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#define TYPED_ARGS2(t1, t2) TYPED_ARGS1(t1), t2 arg2
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#define TYPED_ARGS3(t1, t2, t3) TYPED_ARGS2(t1, t2), t3 arg3
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#define ARGS0()
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#define ARGS1(t1) arg1
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#define ARGS2(t1, t2) ARGS1(t1), arg2
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#define ARGS3(t1, t2, t3) ARGS2(t1, t2), arg3
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#ifdef MOZ_MEMORY
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// Generic interface exposing the whole public allocator API
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// This facilitates the implementation of things like replace-malloc.
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// Note: compilers are expected to be able to optimize out `this`.
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template<typename T>
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struct Allocator : public T
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{
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#define MALLOC_DECL(name, return_type, ...) \
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static return_type name(__VA_ARGS__);
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#include "malloc_decls.h"
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};
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// The MozJemalloc allocator
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struct MozJemallocBase
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{
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};
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typedef Allocator<MozJemallocBase> MozJemalloc;
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#ifdef MOZ_REPLACE_MALLOC
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// The replace-malloc allocator
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struct ReplaceMallocBase
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{
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};
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typedef Allocator<ReplaceMallocBase> ReplaceMalloc;
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typedef ReplaceMalloc DefaultMalloc;
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#else
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typedef MozJemalloc DefaultMalloc;
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#endif
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#endif // MOZ_MEMORY
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// Dummy implementation of the moz_arena_* API, falling back to a given
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// implementation of the base allocator.
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template<typename T>
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struct DummyArenaAllocator
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{
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static arena_id_t moz_create_arena(void) { return 0; }
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static void moz_dispose_arena(arena_id_t) {}
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#define MALLOC_DECL(name, return_type, ...) \
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static return_type moz_arena_##name(arena_id_t, \
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ARGS_HELPER(TYPED_ARGS, ##__VA_ARGS__)) \
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{ \
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return T::name(ARGS_HELPER(ARGS, ##__VA_ARGS__)); \
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}
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#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC_BASE
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#include "malloc_decls.h"
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};
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#endif
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