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base/ram.h: rename Unmapped... to Constrained...

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The 'Allocation' template clears the way for precisely differentiating
allocators via (a variety of) C++ types. It turns out that this approach
alleviate the need to consider the differentiation between
mapped/unmapped in ram.h.

With the new approach, a mapped allocator can be built as a template
taking a ram allocator (constrained/unconstrained) and a local
region-map (core local_rm, env local_rm) as ingredients.

Since the differentiation between constrained/unconstrained has its
natural place at ram.h, name the current RAM allocator
'Ram::Constrained_allocator', in anticipation of a future
'Ram::Unconstrained_allocator' with weakened error conditions.

Issue
This commit is contained in:
Norman Feske 2025-04-06 11:58:32 +02:00
parent 08010003e3
commit 30e200f4ae
2 changed files with 6 additions and 6 deletions
repos/base/include/base
ram.hram_allocator.h

8
repos/base/include/base/ram.h

@ -28,7 +28,7 @@ namespace Genode::Ram {
using Capability = Genode::Capability<Dataspace>;
using Error = Alloc_error;
struct Unmapped_allocator;
struct Constrained_allocator;
template <typename> struct Accounted_allocator;
}
@ -37,7 +37,7 @@ namespace Genode::Ram {
/**
* Allocator of RAM inaccessible by the component at allocation time
*/
struct Genode::Ram::Unmapped_allocator : Interface, Noncopyable
struct Genode::Ram::Constrained_allocator : Interface, Noncopyable
{
struct Attr
{
@ -46,7 +46,7 @@ struct Genode::Ram::Unmapped_allocator : Interface, Noncopyable
};
using Error = Ram::Error;
using Allocation = Genode::Allocation<Unmapped_allocator>;
using Allocation = Genode::Allocation<Constrained_allocator>;
using Result = Allocation::Attempt;
virtual Result try_alloc(size_t size, Cache cache = CACHED) = 0;
@ -136,7 +136,7 @@ struct Genode::Ram::Accounted_allocator : ALLOC
namespace Genode::Ram {
/* shortcuts for the most commonly used type of allocator */
using Allocator = Unmapped_allocator;
using Allocator = Constrained_allocator;
using Allocation = Allocator::Allocation;
}

4
repos/base/include/base/ram_allocator.h

@ -29,7 +29,7 @@ namespace Genode {
}
struct Genode::Ram_allocator : Ram::Unmapped_allocator
struct Genode::Ram_allocator : Ram::Constrained_allocator
{
/**
* Allocate RAM
@ -71,7 +71,7 @@ struct Genode::Ram_allocator : Ram::Unmapped_allocator
}
/* type aliases used for API transition */
using Alloc_result = Ram::Unmapped_allocator::Result;
using Alloc_result = Ram::Constrained_allocator::Result;
using Alloc_error = Ram::Error;
using Denied = Genode::Denied;
};