Merge webkit.org at r58033 : Initial merge by git

Change-Id: If006c38561af287c50cd578d251629b51e4d8cd1

1 files changed, 80 insertions, 0 deletions

diff --git a/JavaScriptCore/wtf/StaticConstructors.h b/JavaScriptCore/wtf/StaticConstructors.h
new file mode 100644
index 0000000..97af339
--- /dev/null
+++ b/JavaScriptCore/wtf/StaticConstructors.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef StaticConstructors_h
+#define StaticConstructors_h
+
+// We need to avoid having static constructors. We achieve this
+// with two separate methods for GCC and MSVC. Both methods prevent the static
+// initializers from being registered and called on program startup. On GCC, we
+// declare the global objects with a different type that can be POD default
+// initialized by the linker/loader. On MSVC we use a special compiler feature
+// to have the CRT ignore our static initializers. The constructors will never
+// be called and the objects will be left uninitialized.
+//
+// With both of these approaches, we must define and explicitly call an init
+// routine that uses placement new to create the objects and overwrite the
+// uninitialized placeholders.
+//
+// This is not completely portable, but is what we have for now without
+// changing how a lot of code accesses these global objects.
+
+#ifdef SKIP_STATIC_CONSTRUCTORS_ON_MSVC
+// - Assume that all includes of this header want ALL of their static
+//   initializers ignored. This is currently the case. This means that if
+//   a .cc includes this header (or it somehow gets included), all static
+//   initializers after the include will not be executed.
+// - We do this with a pragma, so that all of the static initializer pointers
+//   go into our own section, and the CRT won't call them. Eventually it would
+//   be nice if the section was discarded, because we don't want the pointers.
+//   See: http://msdn.microsoft.com/en-us/library/7977wcck(VS.80).aspx
+#pragma warning(disable:4075)
+#pragma init_seg(".unwantedstaticinits")
+#endif
+
+#ifndef SKIP_STATIC_CONSTRUCTORS_ON_GCC
+    // Define an global in the normal way.
+#if COMPILER(MSVC7)
+#define DEFINE_GLOBAL(type, name) \
+    const type name;
+#elif COMPILER(WINSCW)
+#define DEFINE_GLOBAL(type, name, arg...) \
+    const type name;
+#else
+#define DEFINE_GLOBAL(type, name, ...) \
+    const type name;
+#endif
+
+#else
+// Define an correctly-sized array of pointers to avoid static initialization.
+// Use an array of pointers instead of an array of char in case there is some alignment issue.
+#if COMPILER(MSVC7)
+#define DEFINE_GLOBAL(type, name) \
+    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];
+#elif COMPILER(WINSCW)
+#define DEFINE_GLOBAL(type, name, arg...) \
+    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];
+#else
+#define DEFINE_GLOBAL(type, name, ...) \
+    void * name[(sizeof(type) + sizeof(void *) - 1) / sizeof(void *)];
+#endif
+#endif
+
+#endif // StaticConstructors_h