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/* compiler.h
* Copyright (C) 2007-2015, Parrot Foundation.
* Overview:
* defines compiler capabilities and attributes
*/
#ifndef PARROT_COMPILER_H_GUARD
#define PARROT_COMPILER_H_GUARD
/* darwin clang! */
#ifndef __WORDSIZE
# define __WORDSIZE (sizeof(void*) * 8)
#endif
/*
* This set of macros define capabilities that may or may not be available
* for a given compiler. They are based on GCC's and CLANG's __attribute__ functionality.
*/
#ifdef HASATTRIBUTE_NEVER_WORKS
# error This attribute can never succeed. Something has mis-sniffed your configuration.
#endif
#ifdef HASATTRIBUTE_DEPRECATED
# ifdef _MSC_VER
# define __attribute__deprecated__ __declspec(deprecated)
# else
# define __attribute__deprecated__ __attribute__((__deprecated__))
# endif
#else
# define __attribute__deprecated__
#endif
#if defined(HASATTRIBUTE_FORMAT_GNU_PRINTF)
# define __attribute__format__(y, z) __attribute__ ((format (gnu_printf, (y), (z))))
#elif defined(HASATTRIBUTE_FORMAT_MS_PRINTF)
# define __attribute__format__(y, z) __attribute__ ((format (ms_printf, (y), (z))))
#elif defined(HASATTRIBUTE_FORMAT_PRINTF)
# define __attribute__format__(y, z) __attribute__ ((format (printf, (y), (z))))
#else
# define __attribute__format__(y, z)
#endif
#ifdef HASATTRIBUTE_MALLOC
# define __attribute__malloc__ __attribute__((__malloc__))
#else
# define __attribute__malloc__
#endif
#if defined(HASATTRIBUTE_NONNULL) && !defined(__cplusplus)
/* g++ has some problem with this attribute */
# define __attribute__nonnull__(a) __attribute__((__nonnull__(a)))
#else
# define __attribute__nonnull__(a)
#endif
#ifdef HASATTRIBUTE_NORETURN
# ifdef _MSC_VER
# define __attribute__noreturn__ __declspec(noreturn)
# else
# define __attribute__noreturn__ __attribute__((__noreturn__))
# endif
#else
# define __attribute__noreturn__
#endif
#ifdef HASATTRIBUTE_PURE
# define __attribute__pure__ __attribute__((__pure__))
#else
# define __attribute__pure__
#endif
#ifdef HASATTRIBUTE_CONST
# define __attribute__const__ __attribute__((__const__))
#else
# define __attribute__const__
#endif
#ifdef HASATTRIBUTE_UNUSED
# define __attribute__unused__ __attribute__((__unused__))
#else
# define __attribute__unused__
#endif
#ifdef HASATTRIBUTE_WARN_UNUSED_RESULT
# define __attribute__warn_unused_result__ __attribute__((__warn_unused_result__))
#elif defined(_MSC_VER) && _MSC_VER > 1600 && defined(PARROT_HAS_HEADER_SAL)
# define __attribute__warn_unused_result__ _Check_return_
#else
# define __attribute__warn_unused_result__
#endif
#ifdef HASATTRIBUTE_HOT
# define __attribute__hot__ __attribute__((__hot__))
#else
# define __attribute__hot__
#endif
#ifdef HASATTRIBUTE_COLD
# define __attribute__cold__ __attribute__((__cold__))
#else
# define __attribute__cold__
#endif
#ifdef HASATTRIBUTE_RETURNS_NONNULL
# define __attribute__returns_nonnull__ __attribute__((returns_nonnull))
#else
# define __attribute__returns_nonnull__
#endif
/* Shim arguments are arguments that must be included in your function,
* but serve no purpose inside. Mark them with the SHIM() macro so that
* the compiler and/or lint know that it's OK it's unused. Shim arguments
* get "_unused" added to them so that you can't accidentally use them
* without removing the shim designation.
*/
#define SHIM(a) /*@unused@*/ a ##_unused __attribute__unused__
/* UNUSED() is the old way we handled shim arguments Should still be
used in cases where the argument should, at some point be used.
*/
#ifdef __clang__
# define UNUSED(a) (void)(a);
#else
# define UNUSED(a) /*@-noeffect*/if (0) (void)(a)/*@=noeffect*/;
#endif
#ifdef PARROT_HAS_HEADER_SAL
/*
* Microsoft provides two annotations mechanisms. __declspec, which has been
* around for a while, and Microsoft's standard source code annotation
* language (SAL), introduced with Visual C++ 8.0.
* See <http://msdn.microsoft.com/en-us/library/ms182032.aspx>,
* <http://msdn2.microsoft.com/en-us/library/ms235402(VS.80).aspx>,
* <http://msdn2.microsoft.com/en-us/library/dabb5z75(VS.80).aspx>.
*/
# include <sal.h>
/* TODO: New syntax: _Ret_maybenull_ http://msdn.microsoft.com/en-us/library/jj159525.aspx */
# define PARROT_CAN_RETURN_NULL /*@null@*/ __maybenull
# define PARROT_CANNOT_RETURN_NULL /*@notnull@*/ __notnull
#else
# define PARROT_CAN_RETURN_NULL /*@null@*/
# define PARROT_CANNOT_RETURN_NULL /*@notnull@*/ __attribute__returns_nonnull__
#endif /* PARROT_HAS_HEADER_SAL */
#define PARROT_DEPRECATED __attribute__deprecated__
#define PARROT_IGNORABLE_RESULT
#define PARROT_WARN_UNUSED_RESULT __attribute__warn_unused_result__
#define PARROT_PURE_FUNCTION __attribute__pure__ __attribute__warn_unused_result__
/* Pure functions have no side-effects, and depend only on parms or globals. e.g. strlen() */
/* "Many functions have no effects except the return value and their
return value depends only on the parameters and/or global
variables. Such a function can be subject to common subexpression
elimination and loop optimization just as an arithmetic operator
would be. For example, "PARROT_PURE_FUNCTION int square(int x)"
says that the hypothetical function square is safe to call fewer
times than the program says.
Some of common examples of pure functions are strlen or
memcmp. Interesting non-pure functions are functions with infinite
loops or those depending on volatile memory or other system resource,
that may change between two consecutive calls (such as feof in a
multithreading environment)." -- http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
*/
#define PARROT_CONST_FUNCTION __attribute__const__ __attribute__warn_unused_result__
/* Const functions are pure functions, and also do not examine targets of
pointer args or globals. e.g. sqrt() */
/* "Many functions do not examine any values except their arguments,
and have no effects except the return value. Basically this is just
slightly more strict class than the pure attribute below, since
function is not allowed to read global memory. Note that a function
that has pointer arguments and examines the data pointed to must
not be declared const. Likewise, a function that calls a non-const
function usually must not be const. It does not make sense for a
const function to return void."
-- http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
*/
#define PARROT_DOES_NOT_RETURN /*@noreturn@*/ __attribute__noreturn__
#define PARROT_DOES_NOT_RETURN_WHEN_FALSE /*@noreturnwhenfalse@*/
#define PARROT_MALLOC /*@only@*/ __attribute__malloc__ \
__attribute__warn_unused_result__
/* Hot functions can be optimized by the compiler. */
#define PARROT_HOT __attribute__hot__
#define PARROT_COLD __attribute__cold__
/* Macros for exposure tracking for splint. */
/* See http://www.splint.org/manual/html/all.html section 6.2 */
#define PARROT_OBSERVER /*@observer@*/
#define PARROT_EXPOSED /*@exposed@*/
/* Function argument instrumentation */
/* For explanations of the annotations, see http://www.splint.org/manual/manual.html */
#ifdef PARROT_HAS_HEADER_SAL
# define NOTNULL(x) /*@notnull@*/ __notnull x
/* The pointer passed may not be NULL */
# define NULLOK(x) /*@null@*/ __maybenull x
/* The pointer passed may be NULL */
# define ARGIN(x) /*@in@*/ /*@notnull@*/ __in x
# define ARGIN_FORMAT(x) /*@in@*/ /*@notnull@*/ __in x
# define ARGIN_NULLOK(x) /*@in@*/ /*@null@*/ __in_opt x
/* The pointer target must be completely defined before being passed */
/* to the function. */
# define ARGOUT(x) /*@out@*/ /*@notnull@*/ __out x
# define ARGOUT_NULLOK(x) /*@out@*/ /*@null@*/ __out_opt x
/* The pointer target will be defined by the function */
# define ARGMOD(x) /*@in@*/ /*@notnull@*/ __inout x
# define ARGMOD_NULLOK(x) /*@in@*/ /*@null@*/ __inout_opt x
/* The pointer target must be completely defined before being passed, */
/* and MAY be modified by the function. */
# define FUNC_MODIFIES(x) /*@modifies x@*/
/* Never applied by a human, only by the headerizer. */
#else
# define NOTNULL(x) /*@notnull@*/ x
/* The pointer passed may not be NULL */
# define NULLOK(x) /*@null@*/ x
/* The pointer passed may be NULL */
# define ARGIN(x) /*@in@*/ /*@notnull@*/ x
# define ARGIN_FORMAT(x) /*@in@*/ /*@notnull@*/ x
# define ARGIN_NULLOK(x) /*@in@*/ /*@null@*/ x
/* The pointer target must be completely defined before being passed */
/* to the function. */
# define ARGOUT(x) /*@out@*/ /*@notnull@*/ x
# define ARGOUT_NULLOK(x) /*@out@*/ /*@null@*/ x
/* The pointer target will be defined by the function */
# define ARGMOD(x) /*@in@*/ /*@notnull@*/ x
# define ARGMOD_NULLOK(x) /*@in@*/ /*@null@*/ x
/* The pointer target must be completely defined before being passed, */
/* and MAY be modified by the function. */
# define FUNC_MODIFIES(x) /*@modifies x@*/
/* Never applied by a human, only by the headerizer. */
#endif
#define ARGFREE(x) /*@only@*/ /*@out@*/ /*@null@*/ x
/* From the Splint manual: The parameter to free() must reference */
/* an unshared object. Since the parameter is declared using "only", */
/* the caller may not use the referenced object after the call, and */
/* may not pass in a reference to a shared object. There is nothing */
/* special about malloc and free -- their behavior can be described */
/* entirely in terms of the provided annotations. */
#define ARGFREE_NOTNULL(x) /*@only@*/ /*@out@*/ /*@notnull@*/ x
#define PARROT_NO_ADDRESS_SAFETY_ANALYSIS
/* We violate ASAN in Parrot_x_execute_on_exit_handlers() and trace_mem_block() */
#if defined(__clang__) && defined(__has_feature)
# if __has_feature(address_sanitizer)
# undef PARROT_NO_ADDRESS_SAFETY_ANALYSIS
# define PARROT_NO_ADDRESS_SAFETY_ANALYSIS __attribute__((no_address_safety_analysis))
# endif
#endif
#endif /* PARROT_COMPILER_H_GUARD */
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
*/