From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Fri, 11 Nov 2005 16:02:47 +0000 (+0000)
Subject: working gentest
X-Git-Tag: v0.12.20~2170
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=6ef4987c3c6a9fbf5e9742bb679f1632ea7733f5;p=lttv.git

working gentest

git-svn-id: http://ltt.polymtl.ca/svn@1319 04897980-b3bd-0310-b5e0-8ef037075253
---

diff --git a/genevent-new/gentest.c b/genevent-new/gentest.c
new file mode 100644
index 00000000..4f12814c
--- /dev/null
+++ b/genevent-new/gentest.c
@@ -0,0 +1,413 @@
+
+#include <assert.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define min(a,b) (((a)<(b))?a:b)
+#define max(a,b) (((a)>(b))?a:b)
+#define BUG_ON(a) assert(!(a))
+
+/* Calculate the offset needed to align the type */
+static inline unsigned int ltt_align(size_t align_drift,
+																		 size_t size_of_type)
+{
+	size_t alignment = min(sizeof(void*), size_of_type);
+
+	return ((alignment - align_drift) & (alignment-1));
+}
+
+
+/* TEMPLATE */
+
+enum lttng_tasklet_priority {
+	LTTNG_LOW,
+	LTTNG_HIGH,
+};
+
+enum lttng_irq_mode {
+	LTTNG_user,
+	LTTNG_kernel,
+};
+
+struct lttng_mystruct2 {
+	unsigned int irq_id;
+	enum lttng_irq_mode mode;
+	//struct lttng_mystruct teststr1;
+};
+
+
+size_t lttng_get_size_mystruct2(
+		struct lttng_mystruct2 *obj)
+{
+	size_t size=0, locsize;
+	
+	locsize = sizeof(unsigned int);
+	size += ltt_align(size, locsize) + locsize;
+	
+	locsize = sizeof(enum lttng_irq_mode);
+	size += ltt_align(size, locsize) + locsize;
+
+	BUG_ON(sizeof(struct lttng_mystruct2) != size);
+
+	return sizeof(struct lttng_mystruct2);
+}
+
+size_t lttng_get_alignment_mystruct2(
+		struct lttng_mystruct2 *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+	
+	localign = sizeof(enum lttng_irq_mode);
+	align = max(align, localign);
+
+	return align;
+}
+
+void lttng_write_mystruct2(void **to,
+		void **from,
+		size_t *len,
+		struct lttng_mystruct2 *obj)
+{
+	size_t align, size;
+
+	align = lttng_get_alignment_mystruct2(obj);
+	size = lttng_get_size_mystruct2(obj);
+
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
+	} else {
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
+	}
+	
+	*len += size;
+}
+
+
+
+#define LTTNG_ARRAY_SIZE_mystruct_myarray 10
+typedef uint64_t lttng_array_mystruct_myarray[LTTNG_ARRAY_SIZE_mystruct_myarray];
+
+size_t lttng_get_size_array_mystruct_myarray(
+		lttng_array_mystruct_myarray obj)
+{
+	size_t size=0, locsize;
+	
+	locsize = sizeof(uint64_t);
+	/* ltt_align == 0 always*/
+	//size += ltt_align(size, locsize) + (LTTNG_ARRAY_SIZE_mystruct_myarray * locsize);
+	BUG_ON(ltt_align(size, locsize) != 0);
+	size += LTTNG_ARRAY_SIZE_mystruct_myarray * locsize;
+
+	BUG_ON(size != LTTNG_ARRAY_SIZE_mystruct_myarray * sizeof(uint64_t));
+
+	return size;
+}
+
+size_t lttng_get_alignment_array_mystruct_myarray(
+		lttng_array_mystruct_myarray obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(uint64_t);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_array_mystruct_myarray(void **to,
+		void **from,
+		size_t *len,
+		lttng_array_mystruct_myarray obj)
+{
+	size_t align, size;
+	
+	align = lttng_get_alignment_array_mystruct_myarray(obj);
+	size = lttng_get_size_array_mystruct_myarray(obj);
+
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
+	} else {
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
+	}
+	
+	*len += size;
+}
+
+
+typedef struct lttng_sequence_mystruct_mysequence lttng_sequence_mystruct_mysequence;
+struct lttng_sequence_mystruct_mysequence {
+	unsigned int len;
+	double *array;
+};
+
+
+size_t lttng_get_size_sequence_mystruct_mysequence(
+																 lttng_sequence_mystruct_mysequence *obj)
+{
+	size_t size=0, locsize;
+	
+	locsize = sizeof(unsigned int);
+	size += ltt_align(size, locsize) + locsize;
+
+	locsize = sizeof(double);
+	size += ltt_align(size, locsize) + (obj->len * locsize);
+
+	return size;
+}
+
+size_t lttng_get_alignment_sequence_mystruct_mysequence(
+																 lttng_sequence_mystruct_mysequence *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+
+	localign = sizeof(double);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_sequence_mystruct_mysequence(void **to,
+		void **from,
+		size_t *len,
+		lttng_sequence_mystruct_mysequence *obj)
+{
+	size_t align, size;
+	void *varfrom;
+	size_t varlen=0;
+	
+	/* Flush pending memcpy */
+	if(*len != 0) {
+		memcpy(*to, *from, *len);
+		*to += *len;
+		*len = 0;
+	}
+
+	align = lttng_get_alignment_sequence_mystruct_mysequence(obj);
+	//no need size = lttng_get_size_sequence_mystruct_mysequence(obj);
+
+	/* Align output */
+	*to += ltt_align((size_t)(*to), align);
+	
+	/* Copy members */
+	*to += ltt_align((size_t)*to, sizeof(unsigned int));
+	varfrom = &obj->len;
+	varlen += sizeof(unsigned int);
+	memcpy(*to, varfrom, varlen);
+	*to += varlen;
+	varlen = 0;
+
+	*to += ltt_align((size_t)*to, sizeof(double));
+	varfrom = obj->array;
+	varlen += obj->len * sizeof(double);
+	memcpy(*to, varfrom, varlen);
+	*to += varlen;
+	varlen = 0;
+
+	/* Put source *from just after the C sequence */
+	*from = obj+1;
+}
+
+
+
+union lttng_mystruct_myunion {
+	double myfloat;
+	unsigned long myulong;
+};
+
+
+size_t lttng_get_size_mystruct_myunion(
+																 union lttng_mystruct_myunion *obj)
+{
+	size_t size=0, locsize;
+	
+	locsize = sizeof(double);
+	size = max(size, locsize);
+
+	locsize = sizeof(unsigned long);
+	size = max(size, locsize);
+
+	BUG_ON(size != sizeof(union lttng_mystruct_myunion));
+
+	return size;
+}
+
+
+size_t lttng_get_alignment_mystruct_myunion(
+																 union lttng_mystruct_myunion *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(double);
+	align = max(align, localign);
+
+	localign = sizeof(unsigned long);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_mystruct_myunion(void **to,
+		void **from,
+		size_t *len,
+		union lttng_mystruct_myunion *obj)
+{
+	size_t align, size;
+	
+	align = lttng_get_alignment_mystruct_myunion(obj);
+	size = lttng_get_size_mystruct_myunion(obj);
+
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
+	} else {
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
+	}
+	
+	*len += size;
+}
+
+
+struct lttng_mystruct {
+	unsigned int irq_id;
+	enum lttng_irq_mode mode;
+	struct lttng_mystruct2 teststr;
+	lttng_array_mystruct_myarray myarray;
+	lttng_sequence_mystruct_mysequence mysequence;
+	union lttng_mystruct_myunion myunion;
+};
+
+size_t lttng_get_size_mystruct(
+		struct lttng_mystruct *obj)
+{
+	size_t size=0, locsize, localign;
+	
+	locsize = sizeof(unsigned int);
+	size += ltt_align(size, locsize) + locsize;
+	
+	locsize = sizeof(enum lttng_irq_mode);
+	size += ltt_align(size, locsize) + locsize;
+
+	localign = lttng_get_alignment_mystruct2(&obj->teststr);
+	locsize = lttng_get_size_mystruct2(&obj->teststr);
+	size += ltt_align(size, localign) + locsize;
+	
+	localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray);
+	locsize = lttng_get_size_array_mystruct_myarray(obj->myarray);
+	size += ltt_align(size, localign) + locsize;
+	
+	localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence);
+	locsize = lttng_get_size_sequence_mystruct_mysequence(&obj->mysequence);
+	size += ltt_align(size, localign) + locsize;
+	
+	localign = lttng_get_alignment_mystruct_myunion(&obj->myunion);
+	locsize = lttng_get_size_mystruct_myunion(&obj->myunion);
+	size += ltt_align(size, localign) + locsize;
+
+	return size;
+}
+
+
+size_t lttng_get_alignment_mystruct(
+		struct lttng_mystruct *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+	
+	localign = sizeof(enum lttng_irq_mode);
+	align = max(align, localign);
+
+	localign = lttng_get_alignment_mystruct2(&obj->teststr);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_mystruct_myunion(&obj->myunion);
+	align = max(align, localign);
+
+	return align;
+}
+
+void lttng_write_mystruct(void **to,
+		void **from,
+		size_t *len,
+		struct lttng_mystruct *obj)
+{
+	size_t align, size;
+	
+	align = lttng_get_alignment_mystruct(obj);
+	// no need : contains variable size fields.
+	// locsize = lttng_get_size_mystruct(obj);
+
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
+	} else {
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
+	}
+	
+	/* Contains variable sized fields : must explode the structure */
+	
+	size = sizeof(unsigned int);
+	*len += ltt_align((size_t)(*to+*len), size) + size;
+	
+	size = sizeof(enum lttng_irq_mode);
+	*len += ltt_align((size_t)(*to+*len), size) + size;
+
+	lttng_write_mystruct2(to, from, len, &obj->teststr);
+
+	lttng_write_array_mystruct_myarray(to, from, len, obj->myarray);
+
+	/* Variable length field */
+	lttng_write_sequence_mystruct_mysequence(to, from, len, &obj->mysequence);
+	
+	lttng_write_mystruct_myunion(to, from, len, &obj->myunion);
+
+	/* Don't forget to flush last write..... */
+}
+
+
+
+
+
+
+void main()
+{
+	struct lttng_mystruct test;
+	test.mysequence.len = 20;
+	test.mysequence.array = malloc(20);
+
+	size_t size = lttng_get_size_mystruct(&test);
+	size_t align = lttng_get_alignment_mystruct(&test);
+
+	void *buf = malloc(align + size);
+	void *to = buf;
+	void *from = &test;
+	size_t len = 0;
+
+	lttng_write_mystruct(&to, &from, &len, &test);
+	/* Final flush */
+	/* Flush pending memcpy */
+	if(len != 0) {
+		memcpy(to, from, len);
+		to += len;
+		from += len;
+		len = 0;
+	}
+	
+	free(test.mysequence.array);
+	free(buf);
+}
diff --git a/genevent-new/ltt-facility-test-template.h b/genevent-new/ltt-facility-test-template.h
index c7e50ca4..b5efa41c 100644
--- a/genevent-new/ltt-facility-test-template.h
+++ b/genevent-new/ltt-facility-test-template.h
@@ -7,6 +7,7 @@
 
 /* Named types */
 
+
 enum lttng_tasklet_priority {
 	LTTNG_LOW,
 	LTTNG_HIGH,
@@ -23,42 +24,54 @@ struct lttng_mystruct2 {
 	//struct lttng_mystruct teststr1;
 };
 
-size_t lttng_get_size_mystruct2(size_t *ret_align,
+
+size_t lttng_get_size_mystruct2(
 		struct lttng_mystruct2 *obj)
 {
-	size_t size=0, align=0, locsize, localign;
+	size_t size=0, locsize;
 	
 	locsize = sizeof(unsigned int);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + locsize;
 	
 	locsize = sizeof(enum lttng_irq_mode);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + locsize;
 
-	*ret_align = align;
+	BUG_ON(sizeof(struct lttng_mystruct2) != size);
+
+	return sizeof(struct lttng_mystruct2);
+}
+
+size_t lttng_get_alignment_mystruct2(
+		struct lttng_mystruct2 *obj)
+{
+	size_t align=0, localign;
 	
-	return size;
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+	
+	localign = sizeof(enum lttng_irq_mode);
+	align = max(align, localign);
+
+	return align;
 }
 
-void lttng_write_mystruct2(void **ws,
-		void **we,
+void lttng_write_mystruct2(void **to,
+		void **from,
+		size_t *len,
 		struct lttng_mystruct2 *obj)
 {
-	size_t align=0, locsize, localign;
+	size_t align, size;
 
-	locsize = lttng_get_size_mystruct2(&align, 
-		obj);
+	align = lttng_get_alignment_mystruct2(obj);
+	size = lttng_get_size_mystruct2(obj);
 
-	if(*ws == *we) {
-		*we += ltt_align(*we, align);
-		*ws = *we;
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
 	} else {
-		*we += ltt_align(*we, align);	/* C alignment, ok to do a memcpy of it */
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
 	}
 	
-	BUG_ON(locsize != sizeof(struct lttng_mystruct2));
-	*we += locsize;
+	*len += size;
 }
 
 
@@ -66,39 +79,51 @@ void lttng_write_mystruct2(void **ws,
 #define LTTNG_ARRAY_SIZE_mystruct_myarray 10
 typedef uint64_t lttng_array_mystruct_myarray[LTTNG_ARRAY_SIZE_mystruct_myarray];
 
-size_t lttng_get_size_array_mystruct_myarray(size_t *ret_align,
+size_t lttng_get_size_array_mystruct_myarray(
 		lttng_array_mystruct_myarray obj)
 {
-	size_t size=0, align=0, locsize, localign;
+	size_t size=0, locsize;
 	
 	locsize = sizeof(uint64_t);
-	align = max(align, locsize);
-	size += ltt_align(size, locsize) + (LTTNG_ARRAY_SIZE_mystruct_myarray * locsize);
+	/* ltt_align == 0 always*/
+	//size += ltt_align(size, locsize) + (LTTNG_ARRAY_SIZE_mystruct_myarray * locsize);
+	BUG_ON(ltt_align(size, locsize) != 0);
+	size += LTTNG_ARRAY_SIZE_mystruct_myarray * locsize;
+
+	BUG_ON(size != LTTNG_ARRAY_SIZE_mystruct_myarray * sizeof(uint64_t));
 
-	*ret_align = align;
-	
 	return size;
 }
 
-void lttng_write_array_mystruct_myarray(void **ws,
-		void **we,
-		struct lttng_mystruct2 *obj)
+size_t lttng_get_alignment_array_mystruct_myarray(
+		lttng_array_mystruct_myarray obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(uint64_t);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_array_mystruct_myarray(void **to,
+		void **from,
+		size_t *len,
+		lttng_array_mystruct_myarray obj)
 {
-	size_t align=0, locsize, localign;
+	size_t align, size;
 	
-	locsize = lttng_get_size_array_mystruct_myarray(&align, 
-		obj);
+	align = lttng_get_alignment_array_mystruct_myarray(obj);
+	size = lttng_get_size_array_mystruct_myarray(obj);
 
-	if(*ws == *we) {
-		*we += ltt_align(*we, align);
-		*ws = *we;
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
 	} else {
-		*we += ltt_align(*we, align);	/* C alignment, ok to do a memcpy of it */
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
 	}
 	
-	BUG_ON(locsize != LTTNG_ARRAY_SIZE_mystruct_myarray * sizeof(uint64_t));
-
-	*we += locsize;
+	*len += size;
 }
 
 
@@ -109,53 +134,74 @@ struct lttng_sequence_mystruct_mysequence {
 };
 
 
-size_t lttng_get_size_sequence_mystruct_mysequence(size_t *ret_align,
+size_t lttng_get_size_sequence_mystruct_mysequence(
 																 lttng_sequence_mystruct_mysequence *obj)
 {
-	size_t size=0, align=0, locsize, localign;
+	size_t size=0, locsize;
 	
 	locsize = sizeof(unsigned int);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + locsize;
 
 	locsize = sizeof(double);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + (obj->len * locsize);
 
-	*ret_align = align;
-
 	return size;
 }
 
-void lttng_write_sequence_mystruct_mysequence(void **ws,
-		void **we,
+size_t lttng_get_alignment_sequence_mystruct_mysequence(
+																 lttng_sequence_mystruct_mysequence *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+
+	localign = sizeof(double);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_sequence_mystruct_mysequence(void **to,
+		void **from,
+		size_t *len,
 		lttng_sequence_mystruct_mysequence *obj)
 {
-	size_t align=0, locsize, localign;
+	size_t align, size;
+	void *varfrom;
+	size_t varlen=0;
 	
 	/* Flush pending memcpy */
-	if(*ws != *we) {
-		memcpy(*ws, obj, *we-*ws);
-		*ws = *we;
+	if(*len != 0) {
+		memcpy(*to, *from, *len);
+		*to += *len;
+		*len = 0;
 	}
-	
-	lttng_get_size_sequence_mystruct_mysequence(&align, 
-		obj);
 
-	*we += ltt_align(*we, align);
-	*ws = *we;
+	align = lttng_get_alignment_sequence_mystruct_mysequence(obj);
+	//no need size = lttng_get_size_sequence_mystruct_mysequence(obj);
+
+	/* Align output */
+	*to += ltt_align((size_t)(*to), align);
 	
-	*we += ltt_align(*we, sizeof(unsigned int));
-	*ws = *we;
-	*we += sizeof(unsigned int);
-	memcpy(*ws, &obj->len, *we-*ws);
-	*ws = *we;
+	/* Copy members */
+	*to += ltt_align((size_t)*to, sizeof(unsigned int));
+	varfrom = &obj->len;
+	varlen += sizeof(unsigned int);
+	memcpy(*to, varfrom, varlen);
+	*to += varlen;
+	varlen = 0;
+
+	*to += ltt_align((size_t)*to, sizeof(double));
+	varfrom = obj->array;
+	varlen += obj->len * sizeof(double);
+	memcpy(*to, varfrom, varlen);
+	*to += varlen;
+	varlen = 0;
 
-	*we += ltt_align(*we, sizeof(double));
-	*ws = *we;
-	*we += obj->len * sizeof(double);
-	memcpy(*ws, obj->array, *we-*ws);
-	*ws = *we;
+	/* Put source *from just after the C sequence */
+	*from = obj+1;
 }
 
 
@@ -165,44 +211,56 @@ union lttng_mystruct_myunion {
 	unsigned long myulong;
 };
 
-size_t lttng_get_size_mystruct_myunion(size_t *ret_align,
+
+size_t lttng_get_size_mystruct_myunion(
 																 union lttng_mystruct_myunion *obj)
 {
-	size_t size=0, align=0, locsize, localign;
+	size_t size=0, locsize;
 	
 	locsize = sizeof(double);
-	align = max(align, locsize);
 	size = max(size, locsize);
 
 	locsize = sizeof(unsigned long);
-	align = max(align, locsize);
 	size = max(size, locsize);
 
-	*ret_align = align;
+	BUG_ON(size != sizeof(union lttng_mystruct_myunion));
 
 	return size;
 }
 
 
-void lttng_write_mystruct_myunion(void **ws,
-		void **we,
+size_t lttng_get_alignment_mystruct_myunion(
+																 union lttng_mystruct_myunion *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(double);
+	align = max(align, localign);
+
+	localign = sizeof(unsigned long);
+	align = max(align, localign);
+
+	return align;
+}
+
+
+void lttng_write_mystruct_myunion(void **to,
+		void **from,
+		size_t *len,
 		union lttng_mystruct_myunion *obj)
 {
-	size_t align=0, locsize, localign;
+	size_t align, size;
 	
-	locsize = lttng_get_size_mystruct_myunion(&align, 
-		obj);
+	align = lttng_get_alignment_mystruct_myunion(obj);
+	size = lttng_get_size_mystruct_myunion(obj);
 
-	if(*ws == *we) {
-		*we += ltt_align(*we, align);
-		*ws = *we;
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
 	} else {
-		*we += ltt_align(*we, align);	/* C alignment, ok to do a memcpy of it */
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
 	}
 	
-	BUG_ON(locsize != sizeof(union lttng_mystruct_myunion));
-
-	*we += locsize;
+	*len += size;
 }
 
 
@@ -215,94 +273,103 @@ struct lttng_mystruct {
 	union lttng_mystruct_myunion myunion;
 };
 
-size_t lttng_get_size_mystruct(size_t *ret_align,
+size_t lttng_get_size_mystruct(
 		struct lttng_mystruct *obj)
 {
-	size_t size=0, align=0, locsize, localign;
+	size_t size=0, locsize, localign;
 	
 	locsize = sizeof(unsigned int);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + locsize;
 	
 	locsize = sizeof(enum lttng_irq_mode);
-	align = max(align, locsize);
 	size += ltt_align(size, locsize) + locsize;
 
-	locsize = lttng_get_size_mystruct2(&localign,
-			&obj->teststr);
-	align = max(align, localign);
+	localign = lttng_get_alignment_mystruct2(&obj->teststr);
+	locsize = lttng_get_size_mystruct2(&obj->teststr);
 	size += ltt_align(size, localign) + locsize;
 	
-	locsize = lttng_get_size_array_mystruct_myarray(&localign,
-			obj->myarray);
-	align = max(align, localign);
+	localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray);
+	locsize = lttng_get_size_array_mystruct_myarray(obj->myarray);
 	size += ltt_align(size, localign) + locsize;
 	
-	locsize = lttng_get_size_sequence_mystruct_mysequence(&localign,
-			&obj->mysequence);
-	align = max(align, localign);
+	localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence);
+	locsize = lttng_get_size_sequence_mystruct_mysequence(&obj->mysequence);
 	size += ltt_align(size, localign) + locsize;
 	
-	locsize = lttng_get_size_mystruct_myunion(&localign,
-			&obj->myunion);
-	align = max(align, localign);
+	localign = lttng_get_alignment_mystruct_myunion(&obj->myunion);
+	locsize = lttng_get_size_mystruct_myunion(&obj->myunion);
 	size += ltt_align(size, localign) + locsize;
 
-	*ret_align = align;
-
 	return size;
 }
 
-struct lttng_mystruct {
-	unsigned int irq_id;
-	enum lttng_irq_mode mode;
-	struct lttng_mystruct2 teststr;
-	lttng_array_mystruct_myarray myarray;
-	lttng_sequence_mystruct_mysequence mysequence;
-	union lttng_mystruct_myunion myunion;
-};
 
+size_t lttng_get_alignment_mystruct(
+		struct lttng_mystruct *obj)
+{
+	size_t align=0, localign;
+	
+	localign = sizeof(unsigned int);
+	align = max(align, localign);
+	
+	localign = sizeof(enum lttng_irq_mode);
+	align = max(align, localign);
 
-void lttng_write_mystruct(void **ws,
-		void **we,
+	localign = lttng_get_alignment_mystruct2(&obj->teststr);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_array_mystruct_myarray(obj->myarray);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_sequence_mystruct_mysequence(&obj->mysequence);
+	align = max(align, localign);
+	
+	localign = lttng_get_alignment_mystruct_myunion(&obj->myunion);
+	align = max(align, localign);
+
+	return align;
+}
+
+void lttng_write_mystruct(void **to,
+		void **from,
+		size_t *len,
 		struct lttng_mystruct *obj)
 {
-	size_t align=0, locsize, localign;
+	size_t align, size;
 	
-	lttng_get_size_mystruct(&align, 
-		obj);
+	align = lttng_get_alignment_mystruct(obj);
+	// no need : contains variable size fields.
+	// locsize = lttng_get_size_mystruct(obj);
 
-	if(*ws == *we) {
-		*we += ltt_align(*we, align);
-		*ws = *we;
+	if(*len == 0) {
+		*to += ltt_align((size_t)(*to), align);	/* align output */
 	} else {
-		*we += ltt_align(*we, align);	/* C alignment, ok to do a memcpy of it */
+		*len += ltt_align((size_t)(*to+*len), align);	/* C alignment, ok to do a memcpy of it */
 	}
 	
-	locsize = sizeof(unsigned int);
-	*we += ltt_align(*we, locsize) + locsize;
+	/* Contains variable sized fields : must explode the structure */
 	
-	locsize = sizeof(enum lttng_irq_mode);
-	*we += ltt_align(*we, locsize) + locsize;
+	size = sizeof(unsigned int);
+	*len += ltt_align((size_t)(*to+*len), size) + size;
+	
+	size = sizeof(enum lttng_irq_mode);
+	*len += ltt_align((size_t)(*to+*len), size) + size;
 
-	lttng_write_mystruct2(ws, we, 
-			&obj->teststr);
+	lttng_write_mystruct2(to, from, len, &obj->teststr);
 
-	lttng_write_array_mystruct_myarray(ws, we, 
-			obj->myarray);
+	lttng_write_array_mystruct_myarray(to, from, len, obj->myarray);
 
 	/* Variable length field */
-	lttng_write_sequence_mystruct_mysequence(ws, we, 
-			&obj->mysequence);
+	lttng_write_sequence_mystruct_mysequence(to, from, len, &obj->mysequence);
 	
-	lttng_write_mystruct_myunion(ws, we, 
-			obj->myunion);
+	lttng_write_mystruct_myunion(to, from, len, &obj->myunion);
 
 	/* Don't forget to flush last write..... */
 }
 
 
 
+
 /* Event syscall_entry structures */
 
 /* Event syscall_entry logging function */