[kernel] Remove last of old allocator interface

Removing the `allocator.h` file defining the `kutil::allocator`
interface, now that explicit allocators are not being passed around.
Also removed the unused `frame_allocator::raw_allocator` class and
`kutil::invalid_allocator` object.

Tags: memory

src/libraries/kutil/heap_allocator.cpp

@@ -157,21 +157,4 @@ heap_allocator::pop_free(unsigned size)
 	return block;
 }
 
-
-class invalid_allocator :
-	public allocator
-{
-public:
-	virtual void * allocate(size_t) override {
-		kassert(false, "Attempting to allocate from allocator::invalid");
-		return nullptr;
-	}
-
-	virtual void free(void *) override {
-		kassert(false, "Attempting to free from allocator::invalid");
-	}
-} _invalid_allocator;
-
-allocator &allocator::invalid = _invalid_allocator;
-
 } // namespace kutil

src/libraries/kutil/include/kutil/allocator.h

@@ -1,31 +0,0 @@
-#pragma once
-/// \file allocator.h
-/// Allocator interface
-
-#include <stdint.h>
-#include "kernel_memory.h"
-
-namespace kutil {
-
-class allocator
-{
-public:
-	/// Allocate memory.
-	/// \arg length  The amount of memory to allocate, in bytes
-	/// \returns     A pointer to the allocated memory, or nullptr if
-	///              allocation failed.
-	virtual void * allocate(size_t size) = 0;
-
-	/// Free a previous allocation.
-	/// \arg p  A pointer previously retuned by allocate()
-	virtual void free(void *p) = 0;
-
-	template <typename T>
-	inline T * allocate(unsigned count) {
-		return reinterpret_cast<T*>(allocate(count * sizeof(T)));
-	}
-
-	static allocator &invalid;
-};
-
-} // namespace kutil

src/libraries/kutil/include/kutil/heap_allocator.h

@@ -3,14 +3,12 @@
 /// A buddy allocator for a memory heap
 
 #include <stddef.h>
-#include "kutil/allocator.h"
 
 namespace kutil {
 
 
 /// Allocator for a given heap range
-class heap_allocator :
-	public allocator
+class heap_allocator
 {
 public:
 	/// Default constructor creates a valid but empty heap.
@@ -25,11 +23,11 @@ public:
 	/// \arg length  The amount of memory to allocate, in bytes
 	/// \returns     A pointer to the allocated memory, or nullptr if
 	///              allocation failed.
-	virtual void * allocate(size_t length) override;
+	virtual void * allocate(size_t length);
 
 	/// Free a previous allocation.
 	/// \arg p  A pointer previously retuned by allocate()
-	virtual void free(void *p) override;
+	virtual void free(void *p);
 
 	/// Minimum block size is (2^min_size). Must be at least 6.
 	static const unsigned min_size = 6;

src/libraries/kutil/include/kutil/vector.h

@@ -4,7 +4,6 @@
 
 #include <algorithm>
 #include <utility>
-#include "kutil/allocator.h"
 #include "kutil/memory.h"
 
 namespace kutil {

src/libraries/kutil/include/kutil/vm_space.h

@@ -3,7 +3,6 @@
 /// Structure for tracking a range of virtual memory addresses
 
 #include <stdint.h>
-#include "kutil/allocator.h"
 #include "kutil/avl_tree.h"
 
 namespace kutil {