diff options
Diffstat (limited to 'src/lib/cc/compat_compiler.h')
| -rw-r--r-- | src/lib/cc/compat_compiler.h | 51 |
1 files changed, 37 insertions, 14 deletions
diff --git a/src/lib/cc/compat_compiler.h b/src/lib/cc/compat_compiler.h index fbe6a38f1f..015b5af320 100644 --- a/src/lib/cc/compat_compiler.h +++ b/src/lib/cc/compat_compiler.h @@ -1,6 +1,6 @@ /* Copyright (c) 2003-2004, Roger Dingledine * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2019, The Tor Project, Inc. */ + * Copyright (c) 2007-2020, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -65,8 +65,6 @@ /* Temporarily enable and disable warnings. */ #ifdef __GNUC__ -# define PRAGMA_STRINGIFY_(s) #s -# define PRAGMA_JOIN_STRINGIFY_(a,b) PRAGMA_STRINGIFY_(a ## b) /* Support for macro-generated pragmas (c99) */ # define PRAGMA_(x) _Pragma (#x) # ifdef __clang__ @@ -78,17 +76,17 @@ /* we have push/pop support */ # define DISABLE_GCC_WARNING(warningopt) \ PRAGMA_DIAGNOSTIC_(push) \ - PRAGMA_DIAGNOSTIC_(ignored PRAGMA_JOIN_STRINGIFY_(-W,warningopt)) + PRAGMA_DIAGNOSTIC_(ignored warningopt) # define ENABLE_GCC_WARNING(warningopt) \ PRAGMA_DIAGNOSTIC_(pop) #else /* !(defined(__clang__) || GCC_VERSION >= 406) */ /* older version of gcc: no push/pop support. */ # define DISABLE_GCC_WARNING(warningopt) \ - PRAGMA_DIAGNOSTIC_(ignored PRAGMA_JOIN_STRINGIFY_(-W,warningopt)) + PRAGMA_DIAGNOSTIC_(ignored warningopt) # define ENABLE_GCC_WARNING(warningopt) \ - PRAGMA_DIAGNOSTIC_(warning PRAGMA_JOIN_STRINGIFY_(-W,warningopt)) + PRAGMA_DIAGNOSTIC_(warning warningopt) #endif /* defined(__clang__) || GCC_VERSION >= 406 */ -#else /* !(defined(__GNUC__)) */ +#else /* !defined(__GNUC__) */ /* not gcc at all */ # define DISABLE_GCC_WARNING(warning) # define ENABLE_GCC_WARNING(warning) @@ -200,8 +198,8 @@ /** Macro: yield a pointer to the field at position <b>off</b> within the * structure <b>st</b>. Example: * <pre> - * struct a { int foo; int bar; } x; - * off_t bar_offset = offsetof(struct a, bar); + * struct a_t { int foo; int bar; } x; + * ptrdiff_t bar_offset = offsetof(struct a_t, bar); * int *bar_p = STRUCT_VAR_P(&x, bar_offset); * *bar_p = 3; * </pre> @@ -211,10 +209,10 @@ /** Macro: yield a pointer to an enclosing structure given a pointer to * a substructure at offset <b>off</b>. Example: * <pre> - * struct base { ... }; - * struct subtype { int x; struct base b; } x; - * struct base *bp = &x.base; - * struct *sp = SUBTYPE_P(bp, struct subtype, b); + * struct base_t { ... }; + * struct subtype_t { int x; struct base_t b; } x; + * struct base_t *bp = &x.base; + * struct *sp = SUBTYPE_P(bp, struct subtype_t, b); * </pre> */ #define SUBTYPE_P(p, subtype, basemember) \ @@ -223,4 +221,29 @@ /** Macro: Yields the number of elements in array x. */ #define ARRAY_LENGTH(x) ((sizeof(x)) / sizeof(x[0])) -#endif /* !defined(TOR_COMPAT_H) */ +/** + * "Eat" a semicolon that somebody puts at the end of a top-level macro. + * + * Frequently, we want to declare a macro that people will use at file scope, + * and we want to allow people to put a semicolon after the macro. + * + * This declaration of a struct can be repeated any number of times, and takes + * a trailing semicolon afterwards. + **/ +#define EAT_SEMICOLON \ + struct dummy_semicolon_eater__ + +/** + * Tell our static analysis tool to believe that (clang's scan-build or + * coverity scan) that an expression might be true. We use this to suppress + * dead-code warnings. + **/ +#if defined(__COVERITY__) || defined(__clang_analyzer__) +/* By calling getenv, we force the analyzer not to conclude that 'expr' is + * false. */ +#define POSSIBLE(expr) ((expr) || getenv("STATIC_ANALYZER_DEADCODE_DUMMY_")) +#else +#define POSSIBLE(expr) (expr) +#endif /* defined(__COVERITY__) || defined(__clang_analyzer__) */ + +#endif /* !defined(TOR_COMPAT_COMPILER_H) */ |