Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 123 insertions, 0 deletions

diff --git a/js/src/jstypes.h b/js/src/jstypes.h
new file mode 100644
index 0000000000..83205fabaa
--- /dev/null
+++ b/js/src/jstypes.h
@@ -0,0 +1,123 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** File:                jstypes.h
+** Description: Definitions of NSPR's basic types
+**
+** Prototypes and macros used to make up for deficiencies in ANSI environments
+** that we have found.
+**
+** Since we do not wrap <stdlib.h> and all the other standard headers, authors
+** of portable code will not know in general that they need these definitions.
+** Instead of requiring these authors to find the dependent uses in their code
+** and take the following steps only in those C files, we take steps once here
+** for all C files.
+**/
+
+#ifndef jstypes_h
+#define jstypes_h
+
+#include "mozilla/Casting.h"
+#include "mozilla/Types.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+// jstypes.h is (or should be!) included by every file in SpiderMonkey.
+// js-config.h also should be included by every file. So include it here.
+#include "js-config.h"
+
+/*
+ * The linkage of JS API functions differs depending on whether the file is
+ * used within the JS library or not. Any source file within the JS
+ * interpreter should define EXPORT_JS_API whereas any client of the library
+ * should not. STATIC_JS_API is used to build JS as a static library.
+ */
+#if defined(STATIC_JS_API)
+#  define JS_PUBLIC_API
+#  define JS_PUBLIC_DATA
+#elif defined(EXPORT_JS_API) || defined(STATIC_EXPORTABLE_JS_API)
+#  define JS_PUBLIC_API MOZ_EXPORT
+#  define JS_PUBLIC_DATA MOZ_EXPORT
+#else
+#  define JS_PUBLIC_API MOZ_IMPORT_API
+#  define JS_PUBLIC_DATA MOZ_IMPORT_DATA
+#endif
+
+/***********************************************************************
+** MACROS:      JS_BEGIN_MACRO
+**              JS_END_MACRO
+** DESCRIPTION:
+**      Macro body brackets so that macros with compound statement definitions
+**      behave syntactically more like functions when called.
+***********************************************************************/
+#define JS_BEGIN_MACRO do {
+#define JS_END_MACRO \
+  }                  \
+  while (0)
+
+/***********************************************************************
+** FUNCTIONS:   Bit
+**              BitMask
+** DESCRIPTION:
+** Bit masking functions.  XXX n must be <= 31 to be portable
+***********************************************************************/
+namespace js {
+constexpr uint32_t Bit(uint32_t n) { return uint32_t(1) << n; }
+
+constexpr uint32_t BitMask(uint32_t n) { return Bit(n) - 1; }
+}  // namespace js
+
+/***********************************************************************
+** FUNCTIONS:   HowMany
+**              RoundUp
+**              RoundDown
+**              Round
+** DESCRIPTION:
+**      Commonly used functions for operations on compatible types.
+***********************************************************************/
+namespace js {
+constexpr size_t HowMany(size_t x, size_t y) { return (x + y - 1) / y; }
+
+constexpr size_t RoundUp(size_t x, size_t y) { return HowMany(x, y) * y; }
+
+constexpr size_t RoundDown(size_t x, size_t y) { return (x / y) * y; }
+
+constexpr size_t Round(size_t x, size_t y) { return ((x + y / 2) / y) * y; }
+}  // namespace js
+
+#if (defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ == 8) || \
+    (defined(UINTPTR_MAX) && UINTPTR_MAX == 0xFFFFFFFFFFFFFFFFu)
+#  define JS_BITS_PER_WORD 64
+#else
+#  define JS_BITS_PER_WORD 32
+#endif
+
+static_assert(sizeof(void*) == 8 ? JS_BITS_PER_WORD == 64
+                                 : JS_BITS_PER_WORD == 32,
+              "preprocessor and compiler must agree");
+
+/***********************************************************************
+** MACROS:      JS_FUNC_TO_DATA_PTR
+**              JS_DATA_TO_FUNC_PTR
+** DESCRIPTION:
+**      Macros to convert between function and data pointers of the same
+**      size. Use them like this:
+**
+**      JSGetterOp nativeGetter;
+**      JSObject* scriptedGetter;
+**      ...
+**      scriptedGetter = JS_FUNC_TO_DATA_PTR(JSObject*, nativeGetter);
+**      ...
+**      nativeGetter = JS_DATA_TO_FUNC_PTR(JSGetterOp, scriptedGetter);
+**
+***********************************************************************/
+
+#define JS_FUNC_TO_DATA_PTR(type, fun) (mozilla::BitwiseCast<type>(fun))
+#define JS_DATA_TO_FUNC_PTR(type, ptr) (mozilla::BitwiseCast<type>(ptr))
+
+#endif /* jstypes_h */