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/*
* Copyright (c) 2020 Andrew Kelley
*
* This file is part of zig, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#ifndef ZIG_HEAP_HPP
#define ZIG_HEAP_HPP
#include "util_base.hpp"
#include "mem.hpp"
namespace heap {
struct BootstrapAllocator final : mem::Allocator {
void init(const char *name);
void deinit();
void destruct(Allocator *allocator) {}
private:
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate(const mem::TypeInfo &info, size_t count) final;
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate_nonzero(const mem::TypeInfo &info, size_t count) final;
void *internal_reallocate(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void *internal_reallocate_nonzero(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void internal_deallocate(const mem::TypeInfo &info, void *ptr, size_t count) final;
};
struct CAllocator final : mem::Allocator {
void init(const char *name);
void deinit();
static CAllocator *construct(mem::Allocator *allocator, const char *name);
void destruct(mem::Allocator *allocator) final;
private:
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate(const mem::TypeInfo &info, size_t count) final;
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate_nonzero(const mem::TypeInfo &info, size_t count) final;
void *internal_reallocate(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void *internal_reallocate_nonzero(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void internal_deallocate(const mem::TypeInfo &info, void *ptr, size_t count) final;
};
//
// arena allocator
//
// - allocations are backed by the underlying allocator's memory
// - allocations are N:1 relationship to underlying allocations
// - dellocations are noops
// - deinit() releases all underlying memory
//
struct ArenaAllocator final : mem::Allocator {
void init(Allocator *backing, const char *name);
void deinit();
static ArenaAllocator *construct(mem::Allocator *allocator, mem::Allocator *backing, const char *name);
void destruct(mem::Allocator *allocator) final;
private:
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate(const mem::TypeInfo &info, size_t count) final;
ATTRIBUTE_RETURNS_NOALIAS void *internal_allocate_nonzero(const mem::TypeInfo &info, size_t count) final;
void *internal_reallocate(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void *internal_reallocate_nonzero(const mem::TypeInfo &info, void *old_ptr, size_t old_count, size_t new_count) final;
void internal_deallocate(const mem::TypeInfo &info, void *ptr, size_t count) final;
struct Impl;
Impl *impl;
};
extern BootstrapAllocator bootstrap_allocator_state;
extern mem::Allocator &bootstrap_allocator;
extern CAllocator c_allocator_state;
extern mem::Allocator &c_allocator;
} // namespace heap
#endif
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