genode/repos/libports/src/lib/libc/internal/mem_alloc.h
Norman Feske 648bcd1505 libc: unify use of namespaces
This patch unifies the patterns of using the 'Genode' and 'Libc'
namespaces.

Types defined in the 'internal/' headers reside in the 'Libc'
namespace. The code in the headers does not need to use the
'Libc::' prefix.

Compilation units import the 'Libc' namespace after the definition of
local types. Local types reside in the 'Libc' namespace (and should
eventually move to an 'internal/' header).

Since the 'Libc' namespace imports the 'Genode' namespace, there is
no need to use the 'Genode::' prefix. Consequently, code in the
compilation units rarely need to qualify the 'Genode' or 'Libc'
namespaces.

There are a few cases where the 'Libc', the 'Genode', and the global
(libc) namespaces are ambigious. In these cases, an explicit
clarification is needed:

- 'Genode::Allocator' differs from 'Libc::Allocator'.
- 'Genode::Env' differs from 'Libc::Env'.
- Genode's string functions (strcmp, memcpy, strcpy) conflict
  with the names of the (global) libc functions.
- There exist both 'Genode::uint64_t' and the libc'c 'uint64_t'.

Issue #3497
2019-11-19 14:10:55 +01:00

139 lines
3.4 KiB
C++

/*
* \brief Allocator for anonymous memory used by libc
* \author Norman Feske
* \date 2012-05-18
*/
/*
* Copyright (C) 2012-2019 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU Affero General Public License version 3.
*/
#ifndef _LIBC__INTERNAL__MEM_ALLOC_H_
#define _LIBC__INTERNAL__MEM_ALLOC_H_
/* Genode includes */
#include <base/ram_allocator.h>
#include <base/allocator_avl.h>
#include <base/env.h>
#include <util/list.h>
#include <rm_session/rm_session.h>
/* libc-internal includes */
#include <internal/types.h>
namespace Libc {
struct Mem_alloc
{
virtual void *alloc(size_t size, size_t align_log2) = 0;
virtual void free(void *ptr) = 0;
virtual size_t size_at(void const *ptr) const = 0;
};
/**
* Return singleton instance of the memory allocator
*/
Mem_alloc *mem_alloc(bool executable = false);
class Mem_alloc_impl : public Mem_alloc
{
private:
enum {
MIN_CHUNK_SIZE = 4*1024, /* in machine words */
MAX_CHUNK_SIZE = 1024*1024
};
class Dataspace : public List<Dataspace>::Element
{
public:
Ram_dataspace_capability cap;
void *local_addr;
Dataspace(Ram_dataspace_capability c, void *a)
: cap(c), local_addr(a) {}
inline void * operator new(__SIZE_TYPE__, void* addr) {
return addr; }
inline void operator delete(void*) { }
};
class Dataspace_pool : public List<Dataspace>
{
private:
Ram_allocator *_ram; /* RAM session for backing store */
Region_map *_region_map; /* region map of address space */
bool const _executable; /* whether to allocate executable dataspaces */
public:
/**
* Constructor
*/
Dataspace_pool(Ram_allocator *ram,
Region_map *rm, bool executable) :
_ram(ram), _region_map(rm),
_executable(executable)
{ }
/**
* Destructor
*/
~Dataspace_pool();
/**
* Expand dataspace by specified size
*
* \param size number of bytes to add to the dataspace pool
* \param md_alloc allocator to expand. This allocator is also
* used for meta data allocation (only after
* being successfully expanded).
* \throw Region_map::Invalid_dataspace,
* Region_map::Region_conflict
* \return 0 on success or negative error code
*/
int expand(size_t size, Range_allocator *alloc);
void reassign_resources(Ram_allocator *ram, Region_map *rm) {
_ram = ram, _region_map = rm; }
};
Lock mutable _lock;
Dataspace_pool _ds_pool; /* list of dataspaces */
Allocator_avl _alloc; /* local allocator */
size_t _chunk_size;
/**
* Try to allocate block at our local allocator
*
* \return true on success
*
* This function is a utility used by 'alloc' to avoid
* code duplication.
*/
bool _try_local_alloc(size_t size, void **out_addr);
public:
Mem_alloc_impl(Region_map &rm, Ram_allocator &ram,
bool executable = false)
:
_ds_pool(&ram, &rm, executable),
_alloc(0),
_chunk_size(MIN_CHUNK_SIZE)
{ }
void *alloc(size_t size, size_t align_log2);
void free(void *ptr);
size_t size_at(void const *ptr) const;
};
}
#endif /* _LIBC__INTERNAL__MEM_ALLOC_H_ */