From c200dd832789afa298ba45e0b9efdec96c0e92cc Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Sun, 5 Dec 2021 11:55:10 -0800
Subject: Chore: simplified allocator interfaces.

I was never happy with the allocator/reallocator split.
It was originally designed to accomodate things like arenas that don't
free. But the majority of the time you don't care about this.
---
 include/base/fmt.h    |  4 ++--
 include/base/memory.h | 24 +++++++++++++-----------
 2 files changed, 15 insertions(+), 13 deletions(-)

(limited to 'include')

diff --git a/include/base/fmt.h b/include/base/fmt.h
index 92e3261..d4176e8 100644
--- a/include/base/fmt.h
+++ b/include/base/fmt.h
@@ -22,7 +22,7 @@ struct fmt·State
     int (*flush)(fmt·State *);
     struct {
         void *heap;
-        mem·Reallocator mem;
+        mem·Allocator mem;
     };
 };
 
@@ -64,7 +64,7 @@ char *fmt·vesprint(char *buf, char *end, char *fmt, va_list args);
 
 /* low-level interface: used for custom printing verbs */
 int   fmt·open(int fd, int len, char *buf, fmt·State *);    // creates a buffer on a file
-int   fmt·make(mem·Reallocator mem, void *heap, fmt·State *); // creates an in-memory buffer
+int   fmt·make(mem·Allocator mem, void *heap, fmt·State *); // creates an in-memory buffer
 void  fmt·free(fmt·State *); // releases an in-memory buffer
 
 int   fmt·do(fmt·State *, char *fmt);
diff --git a/include/base/memory.h b/include/base/memory.h
index dd00992..767e948 100644
--- a/include/base/memory.h
+++ b/include/base/memory.h
@@ -21,6 +21,7 @@ typedef struct mem·BufHead
     byte  buf[];
 } mem·BufHead;
 
+#define mem·buffer(x)        x*
 #define mem·bufhdr(b)        ((mem·BufHead*)((uint8*)(b)-offsetof(mem·BufHead, buf)))
 #define mem·buflen(b)        ((b) ? (mem·bufhdr(b)->len) : 0)
 #define mem·bufcap(b)        ((b) ? (mem·bufhdr(b)->cap) : 0)
@@ -44,26 +45,27 @@ void* mem·bufgrow(void*, vlong, vlong);
 // memory allocation
 
 /* interfaces */
+typedef struct mem·Pool  mem·Pool;
+typedef struct mem·Arena mem·Arena;
+
 typedef struct mem·Allocator {
     void *(*alloc)(void *heap, uint n, ulong size);
+    void *(*realloc)(void *iface, void *ptr, uint n, ulong size);
     void  (*free)(void *heap, void *ptr);
 } mem·Allocator;
 
-extern mem·Allocator sys·Memory;
+extern mem·Allocator base·Memory; /* standard allocator */
 
-typedef struct mem·Reallocator {
-    void *(*alloc)(void *iface, uint n, ulong size);
-    void *(*realloc)(void *iface, void *ptr, uint n, ulong size);
-    void  (*free)(void *iface, void *ptr);
-} mem·Reallocator;
+/* pool allocator (manages free list) */
+mem·Pool  *mem·makepool(mem·Allocator from, void*);
+void       mem·freepool(mem·Pool);
 
-extern mem·Reallocator sys·FullMemory;
-
-/* simple memory arena */
-typedef struct mem·Arena mem·Arena;
+void      *mem·poolalloc(mem·Pool *, uintptr n, uintptr size);
+void      *mem·poolrealloc(mem·Pool *, void *, uintptr n, uintptr size);
+void       mem·poolfree(mem·Pool *, void *);
 
+/* simple arena allocator (heterogeneous bump) */
 mem·Arena *mem·makearena(mem·Allocator from, void*);
 void      *mem·arenaalloc(mem·Arena *A, uint n, ulong size); 
 void       mem·freearena(mem·Arena *A);
-
 extern mem·Allocator mem·ArenaAllocator;
-- 
cgit v1.2.1