X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Flttng%2Fust-compiler.h;h=e610f98272ff91a366ce10cc15f99d827276a9a8;hb=HEAD;hp=c938361d496ed84e1b924f0e69da489b8e3893f9;hpb=05bfa3dc3a6e6b2ece3686a5f384b6645c2a5010;p=lttng-ust.git diff --git a/include/lttng/ust-compiler.h b/include/lttng/ust-compiler.h index c938361d..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)) /* @@ -68,73 +76,86 @@ #ifdef __cplusplus #define lttng_ust_static_assert(predicate, msg, c_identifier_msg) \ static_assert(predicate, msg) -#elif __STDC_VERSION__ >= 201112L +#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_ust_static_assert(predicate, msg, c_identifier_msg) \ - typedef char lttng_ust_static_assert_##c_identifier_msg[2*!!(predicate)-1] + 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 when building as C, or as the - * constructor/destructor of a variable defined within an anonymous namespace - * when building as C++. + * 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. */ -#ifdef __cplusplus -#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func, \ - destructor_func, ...) \ -namespace lttng { \ -namespace ust { \ -namespace details { \ -class LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \ - name) { \ -public: \ - LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \ - name)() __VA_ARGS__ \ - { \ - constructor_func(); \ - } \ - ~LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_constructor_destructor_, \ - name)() __VA_ARGS__ \ - { \ - destructor_func(); \ - } \ -}; \ -} \ -} \ -} \ - \ -namespace { \ -const lttng::ust::details::LTTNG_UST__TP_COMBINE_TOKENS( \ - lttng_ust_constructor_destructor_, name) \ - LTTNG_UST__TP_COMBINE_TOKENS(name, registration_instance); \ +#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 /* __cplusplus */ -#define LTTNG_UST_DECLARE_CONSTRUCTOR_DESTRUCTOR(name, constructor_func, \ - destructor_func, ...) \ - static void LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \ - __attribute__((constructor)) __VA_ARGS__; \ - static void LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_constructor_, name)(void) \ - { \ - constructor_func(); \ - } \ - static void LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \ - __attribute__((destructor)) __VA_ARGS__; \ - static void LTTNG_UST__TP_COMBINE_TOKENS(lttng_ust_destructor_, name)(void) \ - { \ - destructor_func(); \ +#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