Memory pool manager.

Instead of doing intricate malloc/free tracking during compiling, allocate
everything (which would be discarded after compiling) from a pool that can
be freed en masse when done.

1 files changed, 142 insertions, 0 deletions

diff --git a/src/mesa/shader/slang/slang_mem.c b/src/mesa/shader/slang/slang_mem.c
new file mode 100644
index 00000000000..c7be9a7dc1a
--- /dev/null
+++ b/src/mesa/shader/slang/slang_mem.c
@@ -0,0 +1,142 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5.3
+ *
+ * Copyright (C) 2005-2007  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file slang_mem.c
+ *
+ * Memory manager for GLSL compiler.  The general idea is to do all
+ * allocations out of a large pool then just free the pool when done
+ * compiling to avoid intricate malloc/free tracking and memory leaks.
+ *
+ * \author Brian Paul
+ */
+
+#include "context.h"
+#include "slang_mem.h"
+
+#define GRANULARITY 8
+#define ROUND_UP(B)  ( ((B) + (GRANULARITY - 1)) & ~(GRANULARITY - 1) )
+
+
+slang_mempool *
+_slang_new_mempool(GLuint initialSize)
+{
+   slang_mempool *pool = (slang_mempool *) _mesa_calloc(sizeof(slang_mempool));
+   if (pool) {
+      pool->Data = (char *) _mesa_calloc(initialSize);
+      if (!pool->Data) {
+         _mesa_free(pool);
+         return NULL;
+      }
+      pool->Size = initialSize;
+      pool->Used = 0;
+   }
+   return pool;
+}
+
+
+void
+_slang_delete_mempool(slang_mempool *pool)
+{
+   GLuint total = 0;
+   while (pool) {
+      slang_mempool *next = pool->Next;
+      total += pool->Used;
+      _mesa_free(pool->Data);
+      _mesa_free(pool);
+      pool = next;
+   }
+   printf("TOTAL USED %u\n", total);
+}
+
+
+/**
+ * Alloc 'bytes' from shader mempool.
+ */
+void *
+_slang_alloc(GLuint bytes)
+{
+   slang_mempool *pool;
+   GET_CURRENT_CONTEXT(ctx);
+
+   pool = (slang_mempool *) ctx->Shader.MemPool;
+
+   while (pool) {
+      if (pool->Used + bytes <= pool->Size) {
+         /* found room */
+         void *addr = (void *) (pool->Data + pool->Used);
+         pool->Used += ROUND_UP(bytes);
+         /*printf("alloc %u  Used %u\n", bytes, pool->Used);*/
+         return addr;
+      }
+      else if (pool->Next) {
+         /* try next block */
+         pool = pool->Next;
+      }
+      else {
+         /* alloc new pool */
+         assert(bytes <= pool->Size); /* XXX or max2() */
+         pool->Next = _slang_new_mempool(pool->Size);
+         if (!pool->Next) {
+            /* we're _really_ out of memory */
+            return NULL;
+         }
+         else {
+            pool->Used = ROUND_UP(bytes);
+            return (void *) pool->Data;
+         }
+      }
+   }
+   return NULL;
+}
+
+
+void *
+_slang_realloc(void *oldBuffer, GLuint oldSize, GLuint newSize)
+{
+   const GLuint copySize = (oldSize < newSize) ? oldSize : newSize;
+   void *newBuffer = _slang_alloc(newSize);
+   if (newBuffer && oldBuffer && copySize > 0)
+      _mesa_memcpy(newBuffer, oldBuffer, copySize);
+   return newBuffer;
+}
+
+
+/**
+ * Clone string, storing in current mempool.
+ */
+char *
+_slang_strdup(const char *s)
+{
+   if (s) {
+      size_t l = _mesa_strlen(s);
+      char *s2 = (char *) _slang_alloc(l + 1);
+      if (s2)
+         _mesa_strcpy(s2, s);
+      return s2;
+   }
+   else {
+      return NULL;
+   }
+}