Introduce nvim namespace: Move files.

Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.

src/nvim/func_attr.h

@@ -0,0 +1,110 @@
+#ifndef NEOVIM_FUNC_ATTR_H
+#define NEOVIM_FUNC_ATTR_H
+
+// gcc and clang expose their version as follows:
+//
+// gcc 4.7.2:
+//   __GNUC__          = 4
+//   __GNUC_MINOR__    = 7
+//   __GNUC_PATCHLEVEL = 2
+//
+// clang 3.4 (claims compat with gcc 4.2.1):
+//   __GNUC__          = 4
+//   __GNUC_MINOR__    = 2
+//   __GNUC_PATCHLEVEL = 1
+//   __clang__         = 1
+//   __clang_major__   = 3
+//   __clang_minor__   = 4
+//
+// To view the default defines of these compilers, you can perform:
+//
+// $ gcc -E -dM - </dev/null
+// $ echo | clang -dM -E -
+
+#ifdef __GNUC__
+  // place defines for all gnulikes here, for now that's gcc, clang and
+  // intel.
+
+  // place these after the argument list of the function declaration
+  // (not definition), like so:
+  // void myfunc(void) FUNC_ATTR_ALWAYS_INLINE;
+  #define FUNC_ATTR_MALLOC __attribute__((malloc))
+  #define FUNC_ATTR_ALLOC_ALIGN(x) __attribute__((alloc_align(x)))
+  #define FUNC_ATTR_PURE __attribute__ ((pure))
+  #define FUNC_ATTR_CONST __attribute__((const))
+  #define FUNC_ATTR_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+  #define FUNC_ATTR_ALWAYS_INLINE __attribute__((always_inline))
+  #define FUNC_ATTR_UNUSED __attribute__((unused))
+
+  #ifdef __clang__
+    // clang only
+  #elif defined(__INTEL_COMPILER)
+    // intel only
+  #else
+    #define GCC_VERSION \
+           (__GNUC__ * 10000 + \
+            __GNUC_MINOR__ * 100 + \
+            __GNUC_PATCHLEVEL__)
+    // gcc only
+    #define FUNC_ATTR_ALLOC_SIZE(x) __attribute__((alloc_size(x)))
+    #define FUNC_ATTR_ALLOC_SIZE_PROD(x,y) __attribute__((alloc_size(x,y)))
+    #define FUNC_ATTR_NONNULL_ALL __attribute__((nonnull))
+    #define FUNC_ATTR_NONNULL_ARG(...) __attribute__((nonnull(__VA_ARGS__)))
+    #if GCC_VERSION >= 40900
+      #define FUNC_ATTR_NONNULL_RET __attribute__((returns_nonnull))
+    #endif
+  #endif
+#endif
+
+// define function attributes that haven't been defined for this specific
+// compiler.
+
+#ifndef FUNC_ATTR_MALLOC
+  #define FUNC_ATTR_MALLOC
+#endif
+
+#ifndef FUNC_ATTR_ALLOC_SIZE
+  #define FUNC_ATTR_ALLOC_SIZE(x)
+#endif
+
+#ifndef FUNC_ATTR_ALLOC_SIZE_PROD
+  #define FUNC_ATTR_ALLOC_SIZE_PROD(x,y)
+#endif
+
+#ifndef FUNC_ATTR_ALLOC_ALIGN
+  #define FUNC_ATTR_ALLOC_ALIGN(x)
+#endif
+
+#ifndef FUNC_ATTR_PURE
+  #define FUNC_ATTR_PURE
+#endif
+
+#ifndef FUNC_ATTR_CONST
+  #define FUNC_ATTR_CONST
+#endif
+
+#ifndef FUNC_ATTR_WARN_UNUSED_RESULT
+  #define FUNC_ATTR_WARN_UNUSED_RESULT
+#endif
+
+#ifndef FUNC_ATTR_ALWAYS_INLINE
+  #define FUNC_ATTR_ALWAYS_INLINE
+#endif
+
+#ifndef FUNC_ATTR_UNUSED
+  #define FUNC_ATTR_UNUSED
+#endif
+
+#ifndef FUNC_ATTR_NONNULL_ALL
+  #define FUNC_ATTR_NONNULL_ALL
+#endif
+
+#ifndef FUNC_ATTR_NONNULL_ARG
+  #define FUNC_ATTR_NONNULL_ARG(...)
+#endif
+
+#ifndef FUNC_ATTR_NONNULL_RET
+  #define FUNC_ATTR_NONNULL_RET
+#endif
+
+#endif // NEOVIM_FUNC_ATTR_H