Add palloc0 function to inline MemSet for newNode call.

2 files changed, 23 insertions, 7 deletions

diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h
index aad54a9c26c..cec75309210 100644
--- a/src/include/nodes/nodes.h
+++ b/src/include/nodes/nodes.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: nodes.h,v 1.121 2002/11/06 00:00:44 tgl Exp $
+ * $Id: nodes.h,v 1.122 2002/11/10 02:17:25 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -262,6 +262,24 @@ typedef struct Node
 
 #define nodeTag(nodeptr)		(((Node*)(nodeptr))->type)
 
+/*
+ *	There is no way to dereference the palloc'ed pointer to assign the
+ *	tag, and return the pointer itself, so we need a holder variable.
+ *	Fortunately, this function isn't recursive so we just define
+ *	a global variable for this purpose.
+ */
+extern Node *newNodeMacroHolder;
+
+#define newNode(size, tag) \
+( \
+	AssertMacro((size) >= sizeof(Node)),		/* need the tag, at least */ \
+\
+	newNodeMacroHolder = (Node *) palloc0(size), \
+	newNodeMacroHolder->type = (tag), \
+	newNodeMacroHolder \
+)
+
+
 #define makeNode(_type_)		((_type_ *) newNode(sizeof(_type_),T_##_type_))
 #define NodeSetTag(nodeptr,t)	(((Node*)(nodeptr))->type = (t))
 
@@ -284,11 +302,6 @@ typedef struct Node
  */
 
 /*
- * nodes/nodes.c
- */
-extern Node *newNode(Size size, NodeTag tag);
-
-/*
  * nodes/{outfuncs.c,print.c}
  */
 extern char *nodeToString(void *obj);
diff --git a/src/include/utils/palloc.h b/src/include/utils/palloc.h
index 44adc1ed969..89b5c151a2c 100644
--- a/src/include/utils/palloc.h
+++ b/src/include/utils/palloc.h
@@ -21,7 +21,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: palloc.h,v 1.21 2002/10/11 04:16:44 momjian Exp $
+ * $Id: palloc.h,v 1.22 2002/11/10 02:17:25 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -46,9 +46,12 @@ extern DLLIMPORT MemoryContext CurrentMemoryContext;
  * Fundamental memory-allocation operations (more are in utils/memutils.h)
  */
 extern void *MemoryContextAlloc(MemoryContext context, Size size);
+extern void *MemoryContextAllocZero(MemoryContext context, Size size);
 
 #define palloc(sz)	MemoryContextAlloc(CurrentMemoryContext, (sz))
 
+#define palloc0(sz)	MemoryContextAllocZero(CurrentMemoryContext, (sz))
+
 extern void pfree(void *pointer);
 
 extern void *repalloc(void *pointer, Size size);