internal_defs.h

//===-- internal_defs.h -----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef SCUDO_INTERNAL_DEFS_H_
#define SCUDO_INTERNAL_DEFS_H_

#include "platform.h"

#include <stdint.h>

#ifndef SCUDO_DEBUG
#define SCUDO_DEBUG 0
#endif

#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))

// String related macros.

#define STRINGIFY_(S) #S
#define STRINGIFY(S) STRINGIFY_(S)
#define CONCATENATE_(S, C) S##C
#define CONCATENATE(S, C) CONCATENATE_(S, C)

// Attributes & builtins related macros.

#define INTERFACE __attribute__((visibility("default")))
#define HIDDEN __attribute__((visibility("hidden")))
#define WEAK __attribute__((weak))
#define ALWAYS_INLINE inline __attribute__((always_inline))
#define ALIAS(X) __attribute__((alias(X)))
#define FORMAT(F, A) __attribute__((format(printf, F, A)))
#define NOINLINE __attribute__((noinline))
#define NORETURN __attribute__((noreturn))
#define LIKELY(X) __builtin_expect(!!(X), 1)
#define UNLIKELY(X) __builtin_expect(!!(X), 0)
#if defined(__i386__) || defined(__x86_64__)
// __builtin_prefetch(X) generates prefetchnt0 on x86
#define PREFETCH(X) __asm__("prefetchnta (%0)" : : "r"(X))
#else
#define PREFETCH(X) __builtin_prefetch(X)
#endif
#define UNUSED __attribute__((unused))
#define USED __attribute__((used))
#define NOEXCEPT noexcept

namespace scudo {

typedef unsigned long uptr;
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef signed long sptr;
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef signed long long s64;

// The following two functions have platform specific implementations.
void outputRaw(const char *Buffer);
void NORETURN die();

#define RAW_CHECK_MSG(Expr, Msg)                                               \
  do {                                                                         \
    if (UNLIKELY(!(Expr))) {                                                   \
      outputRaw(Msg);                                                          \
      die();                                                                   \
    }                                                                          \
  } while (false)

#define RAW_CHECK(Expr) RAW_CHECK_MSG(Expr, #Expr)

void NORETURN reportCheckFailed(const char *File, int Line,
                                const char *Condition, u64 Value1, u64 Value2);

#define CHECK_IMPL(C1, Op, C2)                                                 \
  do {                                                                         \
    scudo::u64 V1 = (scudo::u64)(C1);                                          \
    scudo::u64 V2 = (scudo::u64)(C2);                                          \
    if (UNLIKELY(!(V1 Op V2))) {                                               \
      scudo::reportCheckFailed(__FILE__, __LINE__,                             \
                               "(" #C1 ") " #Op " (" #C2 ")", V1, V2);         \
      scudo::die();                                                            \
    }                                                                          \
  } while (false)

#define CHECK(A) CHECK_IMPL((A), !=, 0)
#define CHECK_EQ(A, B) CHECK_IMPL((A), ==, (B))
#define CHECK_NE(A, B) CHECK_IMPL((A), !=, (B))
#define CHECK_LT(A, B) CHECK_IMPL((A), <, (B))
#define CHECK_LE(A, B) CHECK_IMPL((A), <=, (B))
#define CHECK_GT(A, B) CHECK_IMPL((A), >, (B))
#define CHECK_GE(A, B) CHECK_IMPL((A), >=, (B))

#if SCUDO_DEBUG
#define DCHECK(A) CHECK(A)
#define DCHECK_EQ(A, B) CHECK_EQ(A, B)
#define DCHECK_NE(A, B) CHECK_NE(A, B)
#define DCHECK_LT(A, B) CHECK_LT(A, B)
#define DCHECK_LE(A, B) CHECK_LE(A, B)
#define DCHECK_GT(A, B) CHECK_GT(A, B)
#define DCHECK_GE(A, B) CHECK_GE(A, B)
#else
#define DCHECK(A)
#define DCHECK_EQ(A, B)
#define DCHECK_NE(A, B)
#define DCHECK_LT(A, B)
#define DCHECK_LE(A, B)
#define DCHECK_GT(A, B)
#define DCHECK_GE(A, B)
#endif

// The superfluous die() call effectively makes this macro NORETURN.
#define UNREACHABLE(Msg)                                                       \
  do {                                                                         \
    CHECK(0 && Msg);                                                           \
    die();                                                                     \
  } while (0)

} // namespace scudo

#endif // SCUDO_INTERNAL_DEFS_H_