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226 lines
7.3 KiB
C
226 lines
7.3 KiB
C
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_COMPILER_SPECIFIC_H_
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#define BASE_COMPILER_SPECIFIC_H_
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#include "build/build_config.h"
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#if defined(COMPILER_MSVC)
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// For _Printf_format_string_.
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#include <sal.h>
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// Macros for suppressing and disabling warnings on MSVC.
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//
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// Warning numbers are enumerated at:
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// http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx
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//
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// The warning pragma:
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// http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx
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//
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// Using __pragma instead of #pragma inside macros:
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// http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
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// MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and
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// for the next line of the source file.
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#define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress:n))
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// MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.
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// The warning remains disabled until popped by MSVC_POP_WARNING.
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#define MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
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__pragma(warning(disable:n))
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// Pop effects of innermost MSVC_PUSH_* macro.
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#define MSVC_POP_WARNING() __pragma(warning(pop))
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#define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))
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#define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))
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#else // Not MSVC
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#define _Printf_format_string_
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#define MSVC_SUPPRESS_WARNING(n)
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#define MSVC_PUSH_DISABLE_WARNING(n)
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#define MSVC_POP_WARNING()
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#define MSVC_DISABLE_OPTIMIZE()
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#define MSVC_ENABLE_OPTIMIZE()
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#endif // COMPILER_MSVC
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// Annotate a variable indicating it's ok if the variable is not used.
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// (Typically used to silence a compiler warning when the assignment
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// is important for some other reason.)
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// Use like:
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// int x = ...;
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// ALLOW_UNUSED_LOCAL(x);
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#define ALLOW_UNUSED_LOCAL(x) (void)x
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// Annotate a typedef or function indicating it's ok if it's not used.
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// Use like:
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// typedef Foo Bar ALLOW_UNUSED_TYPE;
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#if defined(COMPILER_GCC) || defined(__clang__)
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#define ALLOW_UNUSED_TYPE __attribute__((unused))
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#else
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#define ALLOW_UNUSED_TYPE
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#endif
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// Annotate a function indicating it should not be inlined.
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// Use like:
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// NOINLINE void DoStuff() { ... }
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#if defined(COMPILER_GCC)
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#define NOINLINE __attribute__((noinline))
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#elif defined(COMPILER_MSVC)
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#define NOINLINE __declspec(noinline)
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#else
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#define NOINLINE
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#endif
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#if defined(COMPILER_GCC) && defined(NDEBUG)
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#define ALWAYS_INLINE inline __attribute__((__always_inline__))
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#elif defined(COMPILER_MSVC) && defined(NDEBUG)
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#define ALWAYS_INLINE __forceinline
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#else
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#define ALWAYS_INLINE inline
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#endif
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// Specify memory alignment for structs, classes, etc.
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// Use like:
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// class ALIGNAS(16) MyClass { ... }
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// ALIGNAS(16) int array[4];
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//
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// In most places you can use the C++11 keyword "alignas", which is preferred.
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//
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// But compilers have trouble mixing __attribute__((...)) syntax with
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// alignas(...) syntax.
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//
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// Doesn't work in clang or gcc:
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// struct alignas(16) __attribute__((packed)) S { char c; };
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// Works in clang but not gcc:
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// struct __attribute__((packed)) alignas(16) S2 { char c; };
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// Works in clang and gcc:
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// struct alignas(16) S3 { char c; } __attribute__((packed));
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//
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// There are also some attributes that must be specified *before* a class
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// definition: visibility (used for exporting functions/classes) is one of
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// these attributes. This means that it is not possible to use alignas() with a
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// class that is marked as exported.
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#if defined(COMPILER_MSVC)
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#define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
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#elif defined(COMPILER_GCC)
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#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
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#endif
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// Annotate a function indicating the caller must examine the return value.
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// Use like:
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// int foo() WARN_UNUSED_RESULT;
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// To explicitly ignore a result, see |ignore_result()| in base/macros.h.
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#undef WARN_UNUSED_RESULT
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#if defined(COMPILER_GCC) || defined(__clang__)
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#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define WARN_UNUSED_RESULT
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#endif
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// Tell the compiler a function is using a printf-style format string.
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// |format_param| is the one-based index of the format string parameter;
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// |dots_param| is the one-based index of the "..." parameter.
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// For v*printf functions (which take a va_list), pass 0 for dots_param.
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// (This is undocumented but matches what the system C headers do.)
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#if defined(COMPILER_GCC) || defined(__clang__)
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#define PRINTF_FORMAT(format_param, dots_param) \
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__attribute__((format(printf, format_param, dots_param)))
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#else
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#define PRINTF_FORMAT(format_param, dots_param)
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#endif
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// WPRINTF_FORMAT is the same, but for wide format strings.
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// This doesn't appear to yet be implemented in any compiler.
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// See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38308 .
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#define WPRINTF_FORMAT(format_param, dots_param)
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// If available, it would look like:
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// __attribute__((format(wprintf, format_param, dots_param)))
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// Sanitizers annotations.
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#if defined(__has_attribute)
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#if __has_attribute(no_sanitize)
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#define NO_SANITIZE(what) __attribute__((no_sanitize(what)))
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#endif
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#endif
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#if !defined(NO_SANITIZE)
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#define NO_SANITIZE(what)
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#endif
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// MemorySanitizer annotations.
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#if defined(MEMORY_SANITIZER) && !defined(OS_NACL)
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#include <sanitizer/msan_interface.h>
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// Mark a memory region fully initialized.
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// Use this to annotate code that deliberately reads uninitialized data, for
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// example a GC scavenging root set pointers from the stack.
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#define MSAN_UNPOISON(p, size) __msan_unpoison(p, size)
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// Check a memory region for initializedness, as if it was being used here.
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// If any bits are uninitialized, crash with an MSan report.
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// Use this to sanitize data which MSan won't be able to track, e.g. before
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// passing data to another process via shared memory.
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#define MSAN_CHECK_MEM_IS_INITIALIZED(p, size) \
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__msan_check_mem_is_initialized(p, size)
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#else // MEMORY_SANITIZER
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#define MSAN_UNPOISON(p, size)
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#define MSAN_CHECK_MEM_IS_INITIALIZED(p, size)
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#endif // MEMORY_SANITIZER
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// DISABLE_CFI_PERF -- Disable Control Flow Integrity for perf reasons.
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#if !defined(DISABLE_CFI_PERF)
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#if defined(__clang__) && defined(OFFICIAL_BUILD)
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#define DISABLE_CFI_PERF __attribute__((no_sanitize("cfi")))
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#else
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#define DISABLE_CFI_PERF
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#endif
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#endif
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// Macro useful for writing cross-platform function pointers.
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#if !defined(CDECL)
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#if defined(OS_WIN)
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#define CDECL __cdecl
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#else // defined(OS_WIN)
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#define CDECL
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#endif // defined(OS_WIN)
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#endif // !defined(CDECL)
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// Macro for hinting that an expression is likely to be false.
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#if !defined(UNLIKELY)
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#if defined(COMPILER_GCC) || defined(__clang__)
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#define UNLIKELY(x) __builtin_expect(!!(x), 0)
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#else
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#define UNLIKELY(x) (x)
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#endif // defined(COMPILER_GCC)
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#endif // !defined(UNLIKELY)
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#if !defined(LIKELY)
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#if defined(COMPILER_GCC) || defined(__clang__)
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#define LIKELY(x) __builtin_expect(!!(x), 1)
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#else
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#define LIKELY(x) (x)
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#endif // defined(COMPILER_GCC)
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#endif // !defined(LIKELY)
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// Compiler feature-detection.
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// clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension
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#if defined(__has_feature)
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#define HAS_FEATURE(FEATURE) __has_feature(FEATURE)
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#else
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#define HAS_FEATURE(FEATURE) 0
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#endif
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// Macro for telling -Wimplicit-fallthrough that a fallthrough is intentional.
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#if defined(__clang__)
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#define FALLTHROUGH [[clang::fallthrough]]
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#else
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#define FALLTHROUGH
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#endif
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#endif // BASE_COMPILER_SPECIFIC_H_
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