The canary is basically just to give a better debugging message when you
ralloc_free() something that wasn't rallocated. Reduces maximum memory
usage of apitrace replay of the dota2 demo by 60MB on my 64-bit system (so
half that on a real 32-bit dota2 environment).
---
src/glsl/ralloc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/glsl/ralloc.c b/src/glsl/ralloc.c
index e79dad7..36bc61f 100644
--- a/src/glsl/ralloc.c
+++ b/src/glsl/ralloc.c
@@ -53,8 +53,10 @@ _CRTIMP int _vscprintf(const char *format, va_list argptr);
struct ralloc_header
{
+#ifdef DEBUG
/* A canary value used to determine whether a pointer is ralloc'd. */
unsigned canary;
+#endif
struct ralloc_header *parent;
@@ -78,7 +80,9 @@ get_header(const void *ptr)
{
ralloc_header *info = (ralloc_header *) (((char *) ptr) -
sizeof(ralloc_header));
+#ifdef DEBUG
assert(info->canary == CANARY);
+#endif
return info;
}
@@ -117,7 +121,9 @@ ralloc_size(const void *ctx, size_t size)
add_child(parent, info);
+#ifdef DEBUG
info->canary = CANARY;
+#endif
return PTR_FROM_HEADER(info);
}
--
1.8.4.rc3
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
