X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Flttng%2Fust-compiler.h;h=e610f98272ff91a366ce10cc15f99d827276a9a8;hb=1c1968450409b3c159a3000f9e1a968ff1e5f7e8;hp=f0ec8d0c41d86a73304f3a23b495840168d12537;hpb=9f5ade14faf36df6429d9c6e1d0360854a5669d0;p=lttng-ust.git diff --git a/include/lttng/ust-compiler.h b/include/lttng/ust-compiler.h index f0ec8d0c..e610f982 100644 --- a/include/lttng/ust-compiler.h +++ b/include/lttng/ust-compiler.h @@ -1,15 +1,23 @@ -/* - * SPDX-License-Identifier: MIT - * - * Copyright (C) 2011-2012 Mathieu Desnoyers - * Copyright (C) 2011-2012 Paul Woegerer - */ +// SPDX-FileCopyrightText: 2011-2012 Mathieu Desnoyers +// SPDX-FileCopyrightText: 2011-2012 Paul Woegerer +// +// SPDX-License-Identifier: MIT #ifndef _LTTNG_UST_COMPILER_H #define _LTTNG_UST_COMPILER_H #include +/* + * By default, LTTng-UST uses the priority 150 for the tracepoint and probe + * provider constructors to trace tracepoints located within + * constructors/destructors with a higher priority value within the same + * module. This priority can be overridden by the application. + */ +#ifndef LTTNG_UST_CONSTRUCTOR_PRIO +#define LTTNG_UST_CONSTRUCTOR_PRIO 150 +#endif + #define lttng_ust_notrace __attribute__((no_instrument_function)) /* @@ -32,10 +40,10 @@ * g++ 4.8 and prior do not support C99 compound literals. Therefore, * force allocating those on the heap with these C++ compilers. */ -#if defined (__cplusplus) && defined (__GNUC__) && \ - (__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8)) -# ifndef LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP -# define LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP +#if defined (__cplusplus) && !defined (__clang__) && defined (__GNUC__) && \ + ((__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8))) +# ifndef LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP +# define LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP # endif #endif @@ -44,16 +52,16 @@ * Compound literals are part of the C99 and C11 standards, but not * part of the C++ standards. However, those are supported by both g++ and * clang. In order to be strictly C++11 compliant, defining - * LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header + * LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header * allocates those on the heap in C++. * * Example use: - * static struct mystruct *var = __LTTNG_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 }); + * static struct mystruct *var = LTTNG_UST_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 }); */ -#if defined (__cplusplus) && defined (LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP) -#define __LTTNG_COMPOUND_LITERAL(type, ...) new (type) __VA_ARGS__ +#if defined (__cplusplus) && defined (LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP) +#define LTTNG_UST_COMPOUND_LITERAL(type, ...) new (type) __VA_ARGS__ #else -#define __LTTNG_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ } +#define LTTNG_UST_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ } #endif /* @@ -65,22 +73,90 @@ * static assertion. This parameter must be a valid C identifier as it will * be used as a typedef name. */ -#if defined (__cplusplus) || __STDC_VERSION__ >= 201112L -#define lttng_static_assert(predicate, msg, c_identifier_msg) \ +#ifdef __cplusplus +#define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \ static_assert(predicate, msg) +#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) +#define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \ + _Static_assert(predicate, msg) #else /* * Evaluates the predicate and emit a compilation error on failure. * - * If the predicate evaluates to true, this macro emits a typedef of an array - * of size 0. + * If the predicate evaluates to true, this macro emits a function + * prototype with an argument type which is an array of size 0. * - * If the predicate evaluates to false, this macro emits a typedef of an array - * of negative size which is invalid in C and forces a compiler error. The msg - * parameter is used in the tentative typedef so it is printed to the user. + * If the predicate evaluates to false, this macro emits a function + * prototype with an argument type which is an array of negative size + * which is invalid in C and forces a compiler error. The + * c_identifier_msg parameter is used as the argument identifier so it + * is printed to the user when the error is reported. */ -#define lttng_static_assert(predicate, msg, c_identifier_msg) \ - typedef char lttng_static_assert_##c_identifier_msg[2*!!(predicate)-1]; +#define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \ + void lttng_ust_static_assert_proto(char c_identifier_msg[2*!!(predicate)-1]) +#endif + +/* Combine two tokens. */ +#define LTTNG_UST_COMPILER__COMBINE_TOKENS(_tokena, _tokenb) \ + _tokena##_tokenb +#define LTTNG_UST_COMPILER_COMBINE_TOKENS(_tokena, _tokenb) \ + LTTNG_UST_COMPILER__COMBINE_TOKENS(_tokena, _tokenb) +/* + * Wrap constructor and destructor functions to invoke them as functions with + * the constructor/destructor GNU C attributes, which ensures that those + * constructors/destructors are ordered before/after C++ + * constructors/destructors. + * + * Wrap constructor and destructor functions as the constructor/destructor of a + * variable defined within an anonymous namespace when building as C++ with + * LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP defined. With this option, + * there are no guarantees that the events in C++ constructors/destructors will + * be traced. + */ +#if defined (__cplusplus) && defined (LTTNG_UST_ALLOCATE_COMPOUND_LITERAL_ON_HEAP) +#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func, \ + destructor_func, ...) \ +namespace lttng { \ +namespace ust { \ +namespace details { \ +class LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \ + name) { \ +public: \ + LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() __VA_ARGS__; \ + ~LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() __VA_ARGS__; \ +}; \ +LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)::LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() \ +{ \ + constructor_func(); \ +} \ +LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)::~LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_destructor_, name)() \ +{ \ + destructor_func(); \ +} \ +} \ +} \ +} \ + \ +namespace { \ +const lttng::ust::details::LTTNG_UST_COMPILER_COMBINE_TOKENS( \ + lttng_ust_constructor_destructor_, name) \ + LTTNG_UST_COMPILER_COMBINE_TOKENS(name, registration_instance); \ +} +#else +#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func, \ + destructor_func, ...) \ + static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \ + __attribute__((constructor(LTTNG_UST_CONSTRUCTOR_PRIO))) __VA_ARGS__; \ + static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \ + { \ + constructor_func(); \ + } \ + static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \ + __attribute__((destructor(LTTNG_UST_CONSTRUCTOR_PRIO))) __VA_ARGS__; \ + static void LTTNG_UST_COMPILER_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \ + { \ + destructor_func(); \ + } #endif #endif /* _LTTNG_UST_COMPILER_H */