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* Facebook -> Meta in copyright rg --files | xargs sed -i 's#Copyright (c) Facebook, Inc. and its affiliates.#Copyright (c) Meta Platforms, Inc. and affiliates.#g' * Manual tweaks
185 lines
5.1 KiB
C
185 lines
5.1 KiB
C
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#ifndef incl_HPHP_PORTABILITY_H_
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#define incl_HPHP_PORTABILITY_H_
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// From folly/Likely.h
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#if defined(__GNUC__) && __GNUC__ >= 4
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#define LIKELY(x) (__builtin_expect((x), 1))
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#define UNLIKELY(x) (__builtin_expect((x), 0))
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#else
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#define LIKELY(x) (x)
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#define UNLIKELY(x) (x)
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#endif
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//////////////////////////////////////////////////////////////////////
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/*
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* Various macros to make certain things conditional on either
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* compiler or architecture.
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*
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* Currently we don't *really* compile on anything other than gcc or
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* sometimes clang, and there are some parts of the code using
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* __attribute__ stuff directly, but some things go through these
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* macros to make it maybe easier to change later.
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*/
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//////////////////////////////////////////////////////////////////////
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// TODO: does clang define __GNUC__ ?
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#ifndef __GNUC__
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# define __attribute__(x)
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#endif
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//////////////////////////////////////////////////////////////////////
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#ifdef ATTRIBUTE_UNUSED
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# undef ATTRIBUTE_UNUSED
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#endif
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#ifdef ATTRIBUTE_NORETURN
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# undef ATTRIBUTE_NORETURN
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#endif
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#ifdef ATTRIBUTE_PRINTF
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# undef ATTRIBUTE_PRINTF
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#endif
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#ifdef ATTRIBUTE_PRINTF_STRING
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# undef ATTRIBUTE_PRINTF_STRING
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#endif
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#define ATTRIBUTE_PRINTF_STRING FOLLY_PRINTF_FORMAT
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#ifdef _MSC_VER
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#define ATTRIBUTE_NORETURN __declspec(noreturn)
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#define ATTRIBUTE_PRINTF(a1, a2)
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#ifndef __thread
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# define __thread __declspec(thread)
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#endif
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#define ATTRIBUTE_UNUSED
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#define ALWAYS_INLINE __forceinline
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#define EXTERNALLY_VISIBLE
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#define FLATTEN
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#define NEVER_INLINE __declspec(noinline)
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#define UNUSED
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#else
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#define ATTRIBUTE_NORETURN __attribute__((__noreturn__))
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#define ATTRIBUTE_PRINTF(a1, a2) \
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__attribute__((__format__ (__printf__, a1, a2)))
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#define ATTRIBUTE_UNUSED __attribute__((__unused__))
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#define ALWAYS_INLINE inline __attribute__((__always_inline__))
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#define EXTERNALLY_VISIBLE __attribute__((__externally_visible__))
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#define FLATTEN __attribute__((__flatten__))
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#define NEVER_INLINE __attribute__((__noinline__))
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#define UNUSED __attribute__((__unused__))
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#endif
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#ifdef DEBUG
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# define DEBUG_ONLY /* nop */
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#else
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# define DEBUG_ONLY UNUSED
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#endif
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/*
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* We need to keep some unreferenced functions from being removed by
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* the linker. There is no compile time mechanism for doing this, but
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* by putting them in the same section as some other, referenced function
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* in the same file, we can keep them around.
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*
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* So this macro should be used to mark at least one function that is
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* referenced, and other functions that are not referenced in the same
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* file.
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*
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* Note: this may not work properly with LTO. We'll revisit when/if we
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* move to it.
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*/
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#ifndef __APPLE__
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# define KEEP_SECTION \
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__attribute__((__section__(".text.keep")))
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#else
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# define KEEP_SECTION \
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__attribute__((__section__(".text,.text.keep")))
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#endif
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#if defined(__APPLE__)
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// OS X has a macro "isset" defined in this header. Force the include so we can
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// make sure the macro gets undef'd. (I think this also applies to BSD, but we
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// can cross that road when we come to it.)
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# include <sys/param.h>
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# ifdef isset
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# undef isset
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# endif
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#endif
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//////////////////////////////////////////////////////////////////////
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#if defined(__x86_64__)
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# if defined(__clang__)
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# define DECLARE_FRAME_POINTER(fp) \
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ActRec* fp; \
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asm volatile("mov %%rbp, %0" : "=r" (fp) ::)
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# else
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# define DECLARE_FRAME_POINTER(fp) register ActRec* fp asm("rbp");
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# endif
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#elif defined(_M_X64)
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// TODO: FIXME! Without this implemented properly, the JIT
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// will fail "pretty spectacularly".
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# define DECLARE_FRAME_POINTER(fp) \
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always_assert(false); \
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register ActRec* fp = nullptr;
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#elif defined(__AARCH64EL__)
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# if defined(__clang__)
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# error Clang implementation not done for ARM
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# endif
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# define DECLARE_FRAME_POINTER(fp) register ActRec* fp asm("x29");
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#elif defined(__powerpc64__)
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# if defined(__clang__)
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# error Clang implementation not done for PPC64
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# endif
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# define DECLARE_FRAME_POINTER(fp) register ActRec* fp = (ActRec*) __builtin_frame_address(0);
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#else
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# error What are the stack and frame pointers called on your architecture?
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#endif
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//////////////////////////////////////////////////////////////////////
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// We reserve the exit status 127 to signal a failure in the
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// interpreter. 127 is a valid exit code on all reasonable
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// architectures: POSIX requires at least 8 unsigned bits and
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// Windows 32 signed bits.
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#define HPHP_EXIT_FAILURE 127
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//////////////////////////////////////////////////////////////////////
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#if FACEBOOK
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// Linking in libbfd is a gigantic PITA. If you want this yourself in a non-FB
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// build, feel free to define HAVE_LIBBFD and specify the right options to link
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// in libbfd.a in the extra C++ options.
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#define HAVE_LIBBFD 1
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#endif
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#ifndef PACKAGE
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// The value doesn't matter, but it must be defined before you include
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// bfd.h
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#define PACKAGE "hhvm"
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#endif
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//////////////////////////////////////////////////////////////////////
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#endif
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