Start adding some debugging features to talloc based on Samba's

ancient mem_man.c:

Each TALLOC_CTX now has a field to store its purpose, to aid in
tracking down memory bloat.  A new call talloc_init_named() should be
used instead of talloc_init() so that this is set.

Added talloc_vasprintf to be called by varargs functions.
(This used to be commit 25b97a743573b8c5e0ac886e4bfab581c11b3714)

2 files changed, 48 insertions, 7 deletions

diff --git a/source3/include/talloc.h b/source3/include/talloc.h
index 89c2f82e05..8e20cc028a 100644
--- a/source3/include/talloc.h
+++ b/source3/include/talloc.h
@@ -5,6 +5,7 @@
    Version 3.0
    Samba temporary memory allocation functions
    Copyright (C) Andrew Tridgell 2000
+   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -27,9 +28,18 @@ struct talloc_chunk {
 	void *ptr;
 };
 
+
+/**
+ * talloc allocation pool.  All allocated blocks can be freed in one go.
+ **/
 typedef struct {
 	struct talloc_chunk *list;
 	size_t total_alloc_size;
+
+	/** The name recorded for this pool, if any.  Should describe
+	 * the purpose for which it was allocated.  The string is
+	 * allocated within the pool. **/
+	char *name;
 } TALLOC_CTX;
 
 #endif
diff --git a/source3/lib/talloc.c b/source3/lib/talloc.c
index 262219bdaf..13393c1a69 100644
--- a/source3/lib/talloc.c
+++ b/source3/lib/talloc.c
@@ -3,6 +3,7 @@
    Version 3.0
    Samba temporary memory allocation functions
    Copyright (C) Andrew Tridgell 2000
+   Copyright (C) 2001 by Martin Pool <mbp@samba.org>
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -35,7 +36,7 @@
 
 #include "includes.h"
 
-/* initialise talloc context. */
+/** Create a new talloc context. **/
 TALLOC_CTX *talloc_init(void)
 {
 	TALLOC_CTX *t;
@@ -49,7 +50,27 @@ TALLOC_CTX *talloc_init(void)
 	return t;
 }
 
-/* allocate a bit of memory from the specified pool */
+
+
+/**
+ * Create a new talloc context, with a name specifying its purpose.
+ * Please call this in preference to talloc_init().
+ **/
+TALLOC_CTX *talloc_init_named(char const *fmt, ...)
+{
+	TALLOC_CTX *t;
+	va_list ap;
+
+	t = talloc_init();
+	va_start(ap, fmt);
+	t->name = talloc_vasprintf(t, fmt, ap);
+	va_end(ap);
+
+	return t;
+}
+
+
+/** Allocate a bit of memory from the specified pool **/
 void *talloc(TALLOC_CTX *t, size_t size)
 {
 	void *p;
@@ -166,24 +187,34 @@ char *talloc_strdup(TALLOC_CTX *t, const char *p)
 	return talloc_memdup(t, p, strlen(p) + 1);
 }
 
-/* allocate a bit of memory from the specified pool */
+/**
+ * Perform string formatting, and return a pointer to newly allocated
+ * memory holding the result, inside a memory pool.
+ **/
 char *talloc_asprintf(TALLOC_CTX *t, const char *fmt, ...)
 {
 	va_list ap;
-	int len;
 	char *ret;
 
 	/* work out how long it will be */
 	va_start(ap, fmt);
-	len = vsnprintf(NULL, 0, fmt, ap);
+	ret = talloc_vasprintf(t, fmt, ap);
 	va_end(ap);
+	return ret;
+}
+
+
+char *talloc_vasprintf(TALLOC_CTX *t, const char *fmt, va_list ap)
+{	
+	int len;
+	char *ret;
 	
+	len = vsnprintf(NULL, 0, fmt, ap);
+
 	ret = talloc(t, len+1);
 	if (!ret) return NULL;
 
-	va_start(ap, fmt);
 	vsnprintf(ret, len+1, fmt, ap);
-	va_end(ap);
 
 	return ret;
 }