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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /mfbt/Types.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- 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/. */
+
+/* mfbt foundational types and macros. */
+
+#ifndef mozilla_Types_h
+#define mozilla_Types_h
+
+/*
+ * This header must be valid C and C++, includable by code embedding either
+ * SpiderMonkey or Gecko.
+ */
+
+/* Expose all <stdint.h> types and size_t. */
+#include <stddef.h>
+#include <stdint.h>
+
+/* Implement compiler and linker macros needed for APIs. */
+
+/*
+ * MOZ_EXPORT is used to declare and define a symbol or type which is externally
+ * visible to users of the current library. It encapsulates various decorations
+ * needed to properly export the method's symbol.
+ *
+ * api.h:
+ * extern MOZ_EXPORT int MeaningOfLife(void);
+ * extern MOZ_EXPORT int LuggageCombination;
+ *
+ * api.c:
+ * int MeaningOfLife(void) { return 42; }
+ * int LuggageCombination = 12345;
+ *
+ * If you are merely sharing a method across files, just use plain |extern|.
+ * These macros are designed for use by library interfaces -- not for normal
+ * methods or data used cross-file.
+ */
+#if defined(WIN32)
+# define MOZ_EXPORT __declspec(dllexport)
+#else /* Unix */
+# ifdef HAVE_VISIBILITY_ATTRIBUTE
+# define MOZ_EXPORT __attribute__((visibility("default")))
+# elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+# define MOZ_EXPORT __global
+# else
+# define MOZ_EXPORT /* nothing */
+# endif
+#endif
+
+
+/*
+ * Whereas implementers use MOZ_EXPORT to declare and define library symbols,
+ * users use MOZ_IMPORT_API and MOZ_IMPORT_DATA to access them. Most often the
+ * implementer of the library will expose an API macro which expands to either
+ * the export or import version of the macro, depending upon the compilation
+ * mode.
+ */
+#ifdef _WIN32
+# if defined(__MWERKS__)
+# define MOZ_IMPORT_API /* nothing */
+# else
+# define MOZ_IMPORT_API __declspec(dllimport)
+# endif
+#else
+# define MOZ_IMPORT_API MOZ_EXPORT
+#endif
+
+#if defined(_WIN32) && !defined(__MWERKS__)
+# define MOZ_IMPORT_DATA __declspec(dllimport)
+#else
+# define MOZ_IMPORT_DATA MOZ_EXPORT
+#endif
+
+/*
+ * Consistent with the above comment, the MFBT_API and MFBT_DATA macros expose
+ * export mfbt declarations when building mfbt, and they expose import mfbt
+ * declarations when using mfbt.
+ */
+#if defined(IMPL_MFBT)
+# define MFBT_API MOZ_EXPORT
+# define MFBT_DATA MOZ_EXPORT
+#else
+ /*
+ * On linux mozglue is linked in the program and we link libxul.so with
+ * -z,defs. Normally that causes the linker to reject undefined references in
+ * libxul.so, but as a loophole it allows undefined references to weak
+ * symbols. We add the weak attribute to the import version of the MFBT API
+ * macros to exploit this.
+ */
+# if defined(MOZ_GLUE_IN_PROGRAM)
+# define MFBT_API __attribute__((weak)) MOZ_IMPORT_API
+# define MFBT_DATA __attribute__((weak)) MOZ_IMPORT_DATA
+# else
+# define MFBT_API MOZ_IMPORT_API
+# define MFBT_DATA MOZ_IMPORT_DATA
+# endif
+#endif
+
+/*
+ * C symbols in C++ code must be declared immediately within |extern "C"|
+ * blocks. However, in C code, they need not be declared specially. This
+ * difference is abstracted behind the MOZ_BEGIN_EXTERN_C and MOZ_END_EXTERN_C
+ * macros, so that the user need not know whether he is being used in C or C++
+ * code.
+ *
+ * MOZ_BEGIN_EXTERN_C
+ *
+ * extern MOZ_EXPORT int MostRandomNumber(void);
+ * ...other declarations...
+ *
+ * MOZ_END_EXTERN_C
+ *
+ * This said, it is preferable to just use |extern "C"| in C++ header files for
+ * its greater clarity.
+ */
+#ifdef __cplusplus
+# define MOZ_BEGIN_EXTERN_C extern "C" {
+# define MOZ_END_EXTERN_C }
+#else
+# define MOZ_BEGIN_EXTERN_C
+# define MOZ_END_EXTERN_C
+#endif
+
+/*
+ * GCC's typeof is available when decltype is not.
+ */
+#if defined(__GNUC__) && defined(__cplusplus) && \
+ !defined(__GXX_EXPERIMENTAL_CXX0X__) && __cplusplus < 201103L
+# define decltype __typeof__
+#endif
+
+#endif /* mozilla_Types_h */