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src/util/u_pointer.h

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+/**************************************************************************
+ * 
+ * Copyright 2007-2008 VMware, Inc.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
+ * 
+ **************************************************************************/
+
+#ifndef U_POINTER_H
+#define U_POINTER_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline intptr_t
+pointer_to_intptr( const void *p )
+{
+   union {
+      const void *p;
+      intptr_t i;
+   } pi;
+   pi.p = p;
+   return pi.i;
+}
+
+static inline void *
+intptr_to_pointer( intptr_t i )
+{
+   union {
+      void *p;
+      intptr_t i;
+   } pi;
+   pi.i = i;
+   return pi.p;
+}
+
+static inline uintptr_t
+pointer_to_uintptr( const void *ptr )
+{
+   union {
+      const void *p;
+      uintptr_t u;
+   } pu;
+   pu.p = ptr;
+   return pu.u;
+}
+
+static inline void *
+uintptr_to_pointer( uintptr_t u )
+{
+   union {
+      void *p;
+      uintptr_t u;
+   } pu;
+   pu.u = u;
+   return pu.p;
+}
+
+/**
+ * Return a pointer aligned to next multiple of N bytes.
+ */
+static inline void *
+align_pointer( const void *unaligned, uintptr_t alignment )
+{
+   uintptr_t aligned = (pointer_to_uintptr( unaligned ) + alignment - 1) & ~(alignment - 1);
+   return uintptr_to_pointer( aligned );
+}
+
+
+/**
+ * Return a pointer aligned to next multiple of 16 bytes.
+ */
+static inline void *
+align16( void *unaligned )
+{
+   return align_pointer( unaligned, 16 );
+}
+
+typedef void (*func_pointer)(void);
+
+static inline func_pointer
+pointer_to_func( void *p )
+{
+   union {
+      void *p;
+      func_pointer f;
+   } pf;
+   pf.p = p;
+   return pf.f;
+}
+
+static inline void *
+func_to_pointer( func_pointer f )
+{
+   union {
+      void *p;
+      func_pointer f;
+   } pf;
+   pf.f = f;
+   return pf.p;
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* U_POINTER_H */