一些基础组件

Memory/c_ArenaAllocator.c

@@ -0,0 +1 @@
+#include <c_ArenaAllocator.h>

Memory/c_ArenaAllocator.h

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+#ifndef INCLUDED_C_ARENAALLOCATOR_H
+#define INCLUDED_C_ARENAALLOCATOR_H
+
+#ifndef INCLUDED_C_ALLOCATOR_H
+#include <c_Allocator.h>
+#endif /*INCLUDED_C_ALLOCATOR_H*/
+
+
+#ifndef INCLUDED_C_ARENA_H
+#include <c_Arena.h>
+#endif /*INCLUDED_C_ARENA_H*/
+
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+typedef struct {
+    c_Arena_t* arena;
+}c_ArenaAllocator_t;
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+C_STATIC_FORCE_INLINE
+void c_ArenaAllocator_Init(c_ArenaAllocator_t* self, c_Arena_t* arena) {
+    self->arena = arena;
+}
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+
+C_STATIC_FORCE_INLINE
+C_ALLOCATOR_ALLOC_FN(c_ArenaAllocator_Alloc) {
+    c_ArenaAllocator_t* self = (c_ArenaAllocator_t*)ud;
+    if (!self || !self->arena) return NULL;
+    return c_Arena_Alloc(self->arena, (int)nBytes);
+}
+
+C_STATIC_FORCE_INLINE
+C_ALLOCATOR_FREE_FN(c_ArenaAllocator_Free) {
+    c_ArenaAllocator_t* self = (c_ArenaAllocator_t*)ud;
+    if (!self || !self->arena) return;
+    c_Arena_Free(self->arena, ptr);
+}
+
+C_STATIC_FORCE_INLINE
+C_ALLOCATOR_REALLOC_FN(c_ArenaAllocator_Realloc) {
+    c_ArenaAllocator_t* self = (c_ArenaAllocator_t*)ud;
+    if (!self || !self->arena) return NULL;
+
+    // 情况 1: 指针为空，直接分配新内存
+    if (!ptr) {
+        return c_Arena_Alloc(self->arena, (int)nNewSize);
+    }
+
+    // 情况 2: 新大小为 0，直接释放内存
+    if (nNewSize==0) {
+        c_Arena_Free(self->arena, ptr);
+        return NULL;
+    }
+
+
+    // 情况 3: 伙伴块大小不匹配（需要升级或降级阶数），申请新块
+    return c_Arena_Resize(self->arena, ptr, nOldSize, nNewSize);
+}
+
+/* ------------------------------------------------------------------------------------------------------------------ */
+/*  */
+
+C_STATIC_FORCE_INLINE
+c_Allocator_t c_ArenaAllocator_Build(c_ArenaAllocator_t* self, c_Arena_t* arena) {
+    c_ArenaAllocator_Init(self, arena);
+    c_Allocator_t allocator={0};
+    allocator.ud = self;
+    allocator.alloc = c_ArenaAllocator_Alloc;
+    allocator.free = c_ArenaAllocator_Free;
+    allocator.realloc = c_ArenaAllocator_Realloc;
+    return allocator;
+}
+
+#endif /*INCLUDED_C_ARENAALLOCATOR_H*/