1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 /** 7 * Defines the common macros such as assert, inline, ... 8 */ 9 10 #inline c 11 12 /* 13 * @addtogroup PP 14 * @{ 15 */ 16 17 /* Use PP_INLINE to tell the compiler to inline functions. The main purpose of 18 * inline functions in ppapi is to allow us to define convenience functions in 19 * the ppapi header files, without requiring clients or implementers to link a 20 * PPAPI C library. The "inline" keyword is not supported by pre-C99 C 21 * compilers (such as MS Visual Studio 2008 and older versions of GCC). MSVS 22 * supports __forceinline and GCC supports __inline__. Use of the static 23 * keyword ensures (in C) that the function is not compiled on its own, which 24 * could cause multiple definition errors. 25 * http://msdn.microsoft.com/en-us/library/z8y1yy88.aspx 26 * http://gcc.gnu.org/onlinedocs/gcc/Inline.html 27 */ 28 #if defined(__cplusplus) 29 /* The inline keyword is part of C++ and guarantees we won't get multiple 30 * definition errors. 31 */ 32 # define PP_INLINE inline 33 #else 34 # if defined(_MSC_VER) 35 # define PP_INLINE static __forceinline 36 # else 37 # define PP_INLINE static __inline__ 38 # endif 39 #endif 40 41 /* This is a compile-time assertion useful for ensuring that a given type is 42 a given number of bytes wide. The size of the array is designed to be 1 43 (which should always be valid) if the enum's size is SIZE, and otherwise the 44 size of the array will be -1 (which all/most compilers should flag as an 45 error). This is wrapped inside a struct, because if it is a simple global 46 we get multiple definition errors at link time. 47 48 NAME is the name of the type without any spaces or the struct or enum 49 keywords. 50 51 CTYPENAME is the typename required by C. I.e., for a struct or enum, the 52 appropriate keyword must be included. 53 54 SIZE is the expected size in bytes. 55 */ 56 #define PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, CTYPENAME, SIZE) \ 57 struct PP_Dummy_Struct_For_##NAME { \ 58 char _COMPILE_ASSERT_FAILED_The_type_named_ \ 59 ## NAME ## _is_not_ ## SIZE ## \ 60 _bytes_wide[(sizeof(CTYPENAME) == SIZE) ? 1 : -1]; } 61 62 /* PP_COMPILE_ASSERT_SIZE_IN_BYTES is for typenames that contain no spaces. 63 E.g.: 64 PP_COMPILE_ASSERT_SIZE_IN_BYTES(int, 4); 65 typedef struct { int a; } Foo; 66 PP_COMPILE_ASSERT_SIZE_IN_BYTES(Foo, 4); 67 */ 68 #define PP_COMPILE_ASSERT_SIZE_IN_BYTES(NAME, SIZE) \ 69 PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, NAME, SIZE) 70 71 /* PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES is for typenames that contain 'struct' 72 in C. That is, struct names that are not typedefs. 73 E.g.: 74 struct Foo { int a; }; 75 PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(Foo, 4); 76 */ 77 #define PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(NAME, SIZE) \ 78 PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, struct NAME, SIZE) 79 80 /* PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES is for typenames that contain 'enum' 81 in C. That is, enum names that are not typedefs. 82 E.g.: 83 enum Bar { A = 0, B = 1 }; 84 PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(Foo, 4); 85 */ 86 #define PP_COMPILE_ASSERT_ENUM_SIZE_IN_BYTES(NAME, SIZE) \ 87 PP_COMPILE_ASSERT_SIZE_IN_BYTES_IMPL(NAME, enum NAME, SIZE) 88 89 /** 90 * @} 91 * End of addtogroup PP 92 */ 93 94 #endinl 95
