/* * Copyright (c) 1994 by Xerox Corporation. All rights reserved. * Copyright (c) 1996 by Silicon Graphics. All rights reserved. * Copyright (c) 1998 by Fergus Henderson. All rights reserved. * Copyright (c) 2000-2009 by Hewlett-Packard Development Company. * All rights reserved. * Copyright (c) 2008-2020 Ivan Maidanski * * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. * * Permission is hereby granted to use or copy this program * for any purpose, provided the above notices are retained on all copies. * Permission to modify the code and to distribute modified code is granted, * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice.
*/
/* This should never be included directly; it is included only from gc.h. */ /* We separate it only to make gc.h more suitable as documentation. */ #ifdefined(GC_H)
/* Convenient internal macro to test version of GCC. */ #ifdefined(__GNUC__) && defined(__GNUC_MINOR__) # define GC_GNUC_PREREQ(major, minor) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((major) << 16) + (minor)) #else # define GC_GNUC_PREREQ(major, minor) 0 /* FALSE */ #endif
/* Some tests for old macros. These violate our namespace rules and */ /* will disappear shortly. Use the GC_ names. */ #ifdefined(SOLARIS_THREADS) || defined(_SOLARIS_THREADS) \
|| defined(_SOLARIS_PTHREADS) || defined(GC_SOLARIS_PTHREADS) /* We no longer support old style Solaris threads. */ /* GC_SOLARIS_THREADS now means pthreads. */ # ifndef GC_SOLARIS_THREADS # define GC_SOLARIS_THREADS # endif #endif #ifdefined(IRIX_THREADS) # define GC_IRIX_THREADS #endif #ifdefined(DGUX_THREADS) && !defined(GC_DGUX386_THREADS) # define GC_DGUX386_THREADS #endif #ifdefined(AIX_THREADS) # define GC_AIX_THREADS #endif #ifdefined(HPUX_THREADS) # define GC_HPUX_THREADS #endif #ifdefined(OSF1_THREADS) # define GC_OSF1_THREADS #endif #ifdefined(LINUX_THREADS) # define GC_LINUX_THREADS #endif #ifdefined(WIN32_THREADS) # define GC_WIN32_THREADS #endif #ifdefined(RTEMS_THREADS) # define GC_RTEMS_PTHREADS #endif #ifdefined(USE_LD_WRAP) # define GC_USE_LD_WRAP #endif
#ifdefined(GC_WIN32_PTHREADS) && !defined(GC_WIN32_THREADS) /* Using pthreads-win32 library (or other Win32 implementation). */ # define GC_WIN32_THREADS #endif
#if !defined(_REENTRANT) && defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS) /* Better late than never. This fails if system headers that depend */ /* on this were previously included. */ # define _REENTRANT 1 #endif
#define __GC #if !defined(_WIN32_WCE) || defined(__GNUC__) # include <stddef.h> # ifdefined(__MINGW32__) && !defined(_WIN32_WCE) # include <stdint.h> /* We mention uintptr_t. */ /* Perhaps this should be included in pure msft environments */ /* as well? */ # endif #else/* _WIN32_WCE */ /* Yet more kludges for WinCE. */ # include <stdlib.h> /* size_t is defined here */ # ifndef _PTRDIFF_T_DEFINED /* ptrdiff_t is not defined */ # define _PTRDIFF_T_DEFINED typedeflong ptrdiff_t; # endif #endif/* _WIN32_WCE */
#ifndef GC_ATTR_MALLOC /* 'malloc' attribute should be used for all malloc-like functions */ /* (to tell the compiler that a function may be treated as if any */ /* non-NULL pointer it returns cannot alias any other pointer valid */ /* when the function returns). If the client code violates this rule */ /* by using custom GC_oom_func then define GC_OOM_FUNC_RETURNS_ALIAS. */ # ifdef GC_OOM_FUNC_RETURNS_ALIAS # define GC_ATTR_MALLOC /* empty */ # elif GC_GNUC_PREREQ(3, 1) # define GC_ATTR_MALLOC __attribute__((__malloc__)) # elif defined(_MSC_VER) && (_MSC_VER >= 1900) && !defined(__EDG__) # define GC_ATTR_MALLOC \
__declspec(allocator) __declspec(noalias) __declspec(restrict) # elif defined(_MSC_VER) && _MSC_VER >= 1400 # define GC_ATTR_MALLOC __declspec(noalias) __declspec(restrict) # else # define GC_ATTR_MALLOC # endif #endif
/* If we're on a platform on which we can't save call stacks, but */ /* gcc is normally used, we go ahead and define GC_ADD_CALLER. */ /* We make this decision independent of whether gcc is actually being */ /* used, in order to keep the interface consistent, and allow mixing */ /* of compilers. */ /* This may also be desirable if it is possible but expensive to */ /* retrieve the call chain. */ #if (defined(__linux__) || defined(__DragonFly__) || defined(__FreeBSD__) \
|| defined(__FreeBSD_kernel__) || defined(__HAIKU__) \
|| defined(__NetBSD__) || defined(__OpenBSD__) \
|| defined(HOST_ANDROID) || defined(__ANDROID__)) \
&& !defined(GC_CAN_SAVE_CALL_STACKS) # define GC_ADD_CALLER # if GC_GNUC_PREREQ(2, 95) /* gcc knows how to retrieve return address, but we don't know */ /* how to generate call stacks. */ # define GC_RETURN_ADDR (GC_word)__builtin_return_address(0) # if GC_GNUC_PREREQ(4, 0) && (defined(__i386__) || defined(__amd64__) \
|| defined(__x86_64__) /* and probably others... */) \
&& !defined(GC_NO_RETURN_ADDR_PARENT) # define GC_HAVE_RETURN_ADDR_PARENT # define GC_RETURN_ADDR_PARENT \
(GC_word)__builtin_extract_return_addr(__builtin_return_address(1)) /* Note: a compiler might complain that calling */ /* __builtin_return_address with a nonzero argument is unsafe. */ # endif # else /* Just pass 0 for gcc compatibility. */ # define GC_RETURN_ADDR 0 # endif #endif/* !GC_CAN_SAVE_CALL_STACKS */
#ifdef GC_PTHREADS
# if (defined(GC_DARWIN_THREADS) || defined(GC_WIN32_PTHREADS) \
|| defined(__native_client__) || defined(GC_RTEMS_PTHREADS)) \
&& !defined(GC_NO_DLOPEN) /* Either there is no dlopen() or we do not need to intercept it. */ # define GC_NO_DLOPEN # endif
# if (defined(GC_DARWIN_THREADS) || defined(GC_WIN32_PTHREADS) \
|| defined(GC_OPENBSD_THREADS) || defined(__native_client__)) \
&& !defined(GC_NO_PTHREAD_SIGMASK) /* Either there is no pthread_sigmask() or no need to intercept it. */ # define GC_NO_PTHREAD_SIGMASK # endif
# ifdefined(__native_client__) /* At present, NaCl pthread_create() prototype does not have */ /* "const" for its "attr" argument; also, NaCl pthread_exit() one */ /* does not have "noreturn" attribute. */ # ifndef GC_PTHREAD_CREATE_CONST # define GC_PTHREAD_CREATE_CONST /* empty */ # endif # ifndef GC_HAVE_PTHREAD_EXIT # define GC_HAVE_PTHREAD_EXIT # define GC_PTHREAD_EXIT_ATTRIBUTE /* empty */ # endif # endif
# if !defined(GC_HAVE_PTHREAD_EXIT) \
&& !defined(HOST_ANDROID) && !defined(__ANDROID__) \
&& (defined(GC_LINUX_THREADS) || defined(GC_SOLARIS_THREADS)) # define GC_HAVE_PTHREAD_EXIT /* Intercept pthread_exit on Linux and Solaris. */ # if GC_GNUC_PREREQ(2, 7) # define GC_PTHREAD_EXIT_ATTRIBUTE __attribute__((__noreturn__)) # elif defined(__NORETURN) /* used in Solaris */ # define GC_PTHREAD_EXIT_ATTRIBUTE __NORETURN # else # define GC_PTHREAD_EXIT_ATTRIBUTE /* empty */ # endif # endif
# if (!defined(GC_HAVE_PTHREAD_EXIT) || defined(__native_client__)) \
&& !defined(GC_NO_PTHREAD_CANCEL) /* Either there is no pthread_cancel() or no need to intercept it. */ # define GC_NO_PTHREAD_CANCEL # endif
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