Attachment 343230 Details for Bug 186885 – Patch

[patch] Patch

wtf-wk-define-type.diff (text/plain), 3.75 KB, created by Carlos Garcia Campos on 2018-06-21 03:25:24 PDT

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Creator: Carlos Garcia Campos

Created: 2018-06-21 03:25:24 PDT

Size: 3.75 KB

patch

obsolete

>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index 63c500aa2cf..afea01758eb 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,29 @@
>+2018-06-21  Carlos Garcia Campos  <cgarcia@igalia.com>
>+
>+        [GLIB] improve get_type() fast path in WEBKIT_DEFINE_TYPE
>+        https://bugs.webkit.org/show_bug.cgi?id=186885
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This is a backport of glib commit
>+        https://gitlab.gnome.org/GNOME/glib/commit/e924f777369710221c3e0a9d7bf40392a27d1fa4
>+
>+        "The -fstack-protector-strong used in many distributions by default has a
>+        rather drastic slowdown of the fast path in generated _get_type()
>+        functions using G_DEFINE_* macros. The amount can vary by architecture,
>+        GCC version, and compiler flags.
>+
>+        To work around this, and ensure a higher probability that our fast-path
>+        will match what we had previously, we need to break out the slow-path
>+        (registering the type) into a secondary function that is not a candidate
>+        for inlining.
>+
>+        This ensures that the common case (type registered, return the GType id)
>+        is the hot path and handled in the prologue of the generated assembly even
>+        when -fstack-protector-strong is enabled."
>+
>+        * wtf/glib/WTFGType.h:
>+
> 2018-06-20  Yusuke Suzuki  <utatane.tea@gmail.com>
> 
>         [GTK][WPE][Nicosia] Add name for Nicosia Painting Threads
>diff --git a/Source/WTF/wtf/glib/WTFGType.h b/Source/WTF/wtf/glib/WTFGType.h
>index 7f1cf4dc374..17612e697d0 100644
>--- a/Source/WTF/wtf/glib/WTFGType.h
>+++ b/Source/WTF/wtf/glib/WTFGType.h
>@@ -46,6 +46,7 @@ static void destroy##structName(structName* data) \
> #define _WEBKIT_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \
> \
> static void type_name##_class_init(TypeName##Class* klass); \
>+static GType type_name##_get_type_once(void); \
> static gpointer type_name##_parent_class = 0; \
> static void type_name##_finalize(GObject* object) \
> { \
>@@ -68,23 +69,30 @@ static void type_name##_init(TypeName* self, gpointer) \
>     TypeName##Private* priv = G_TYPE_INSTANCE_GET_PRIVATE(self, type_name##_get_type(), TypeName##Private); \
>     self->priv = priv; \
>     new (priv) TypeName##Private(); \
>-}\
>+} \
>+\
> GType type_name##_get_type(void) \
> { \
>     static volatile gsize g_define_type_id__volatile = 0; \
>     if (g_once_init_enter(&g_define_type_id__volatile)) { \
>-        GType g_define_type_id = \
>-            g_type_register_static_simple( \
>-                TYPE_PARENT, \
>-                g_intern_static_string(#TypeName), \
>-                sizeof(TypeName##Class), \
>-                (GClassInitFunc)type_name##_class_intern_init, \
>-                sizeof(TypeName), \
>-                (GInstanceInitFunc)type_name##_init, \
>-                (GTypeFlags)flags); \
>-        // Custom code follows.
>-#define _WEBKIT_DEFINE_TYPE_EXTENDED_END() \
>+        GType g_define_type_id = type_name##_get_type_once(); \
>         g_once_init_leave(&g_define_type_id__volatile, g_define_type_id); \
>     } \
>     return g_define_type_id__volatile; \
>-} // Closes type_name##_get_type().
>+} /* Closes type_name##_get_type(). */ \
>+\
>+G_GNUC_NO_INLINE static GType type_name##_get_type_once(void) \
>+{ \
>+    GType g_define_type_id =  \
>+        g_type_register_static_simple( \
>+            TYPE_PARENT, \
>+            g_intern_static_string(#TypeName), \
>+            sizeof(TypeName##Class), \
>+            (GClassInitFunc)(void (*)(void))type_name##_class_intern_init, \
>+            sizeof(TypeName), \
>+            (GInstanceInitFunc)(void (*)(void))type_name##_init, \
>+            (GTypeFlags)flags); \
>+    /* Custom code follows. */
>+#define _WEBKIT_DEFINE_TYPE_EXTENDED_END() \
>+    return g_define_type_id; \
>+} /* Closes type_name##_get_type_once() */

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Attachments on bug 186885: 343230 | 343232