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📄 allocator_config.h(2.57 KB)
📄 atomic_helpers.h(4.16 KB)
📄 bytemap.h(992 B)
📄 checksum.cpp(2.52 KB)
📄 checksum.h(1.67 KB)
📄 chunk.h(5.83 KB)
📄 combined.h(40.99 KB)
📄 common.cpp(874 B)
📄 common.h(5.29 KB)
📄 crc32_hw.cpp(656 B)
📄 flags.cpp(2.09 KB)
📄 flags.h(975 B)
📄 flags.inc(2.41 KB)
📄 flags_parser.cpp(4.38 KB)
📄 flags_parser.h(1.23 KB)
📄 fuchsia.cpp(6.04 KB)
📄 fuchsia.h(695 B)
📁 fuzz
📁 include
📄 internal_defs.h(4.61 KB)
📄 linux.cpp(6.1 KB)
📄 linux.h(2.77 KB)
📄 list.h(4.95 KB)
📄 local_cache.h(5.21 KB)
📄 memtag.h(7.21 KB)
📄 mutex.h(1.69 KB)
📄 platform.h(2.03 KB)
📄 primary32.h(18.05 KB)
📄 primary64.h(17.3 KB)
📄 quarantine.h(9.64 KB)
📄 release.cpp(522 B)
📄 release.h(10.27 KB)
📄 report.cpp(6.62 KB)
📄 report.h(1.97 KB)
📄 secondary.h(13.22 KB)
📄 size_class_map.h(9.9 KB)
📄 stack_depot.h(4.47 KB)
📄 stats.h(2.77 KB)
📄 string_utils.cpp(7.93 KB)
📄 string_utils.h(1.05 KB)
📄 tsd.h(1.84 KB)
📄 tsd_exclusive.h(4.03 KB)
📄 tsd_shared.h(5.53 KB)
📄 vector.h(3.07 KB)
📄 wrappers_c.cpp(1.19 KB)
📄 wrappers_c.h(1.46 KB)
📄 wrappers_c.inc(8.6 KB)
📄 wrappers_c_bionic.cpp(2.23 KB)
📄 wrappers_c_checks.h(1.99 KB)
📄 wrappers_cpp.cpp(4.53 KB)

Editing: common.h

//===-- common.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_COMMON_H_
#define SCUDO_COMMON_H_

#include "internal_defs.h"

#include "fuchsia.h"
#include "linux.h"

#include <stddef.h>
#include <string.h>

namespace scudo {

template <class Dest, class Source> inline Dest bit_cast(const Source &S) {
  static_assert(sizeof(Dest) == sizeof(Source), "");
  Dest D;
  memcpy(&D, &S, sizeof(D));
  return D;
}

inline constexpr uptr roundUpTo(uptr X, uptr Boundary) {
  return (X + Boundary - 1) & ~(Boundary - 1);
}

inline constexpr uptr roundDownTo(uptr X, uptr Boundary) {
  return X & ~(Boundary - 1);
}

inline constexpr bool isAligned(uptr X, uptr Alignment) {
  return (X & (Alignment - 1)) == 0;
}

template <class T> constexpr T Min(T A, T B) { return A < B ? A : B; }

template <class T> constexpr T Max(T A, T B) { return A > B ? A : B; }

template <class T> void Swap(T &A, T &B) {
  T Tmp = A;
  A = B;
  B = Tmp;
}

inline bool isPowerOfTwo(uptr X) { return (X & (X - 1)) == 0; }

inline uptr getMostSignificantSetBitIndex(uptr X) {
  DCHECK_NE(X, 0U);
  return SCUDO_WORDSIZE - 1U - static_cast<uptr>(__builtin_clzl(X));
}

inline uptr roundUpToPowerOfTwo(uptr Size) {
  DCHECK(Size);
  if (isPowerOfTwo(Size))
    return Size;
  const uptr Up = getMostSignificantSetBitIndex(Size);
  DCHECK_LT(Size, (1UL << (Up + 1)));
  DCHECK_GT(Size, (1UL << Up));
  return 1UL << (Up + 1);
}

inline uptr getLeastSignificantSetBitIndex(uptr X) {
  DCHECK_NE(X, 0U);
  return static_cast<uptr>(__builtin_ctzl(X));
}

inline uptr getLog2(uptr X) {
  DCHECK(isPowerOfTwo(X));
  return getLeastSignificantSetBitIndex(X);
}

inline u32 getRandomU32(u32 *State) {
  // ANSI C linear congruential PRNG (16-bit output).
  // return (*State = *State * 1103515245 + 12345) >> 16;
  // XorShift (32-bit output).
  *State ^= *State << 13;
  *State ^= *State >> 17;
  *State ^= *State << 5;
  return *State;
}

inline u32 getRandomModN(u32 *State, u32 N) {
  return getRandomU32(State) % N; // [0, N)
}

template <typename T> inline void shuffle(T *A, u32 N, u32 *RandState) {
  if (N <= 1)
    return;
  u32 State = *RandState;
  for (u32 I = N - 1; I > 0; I--)
    Swap(A[I], A[getRandomModN(&State, I + 1)]);
  *RandState = State;
}

// Hardware specific inlinable functions.

inline void yieldProcessor(u8 Count) {
#if defined(__i386__) || defined(__x86_64__)
  __asm__ __volatile__("" ::: "memory");
  for (u8 I = 0; I < Count; I++)
    __asm__ __volatile__("pause");
#elif defined(__aarch64__) || defined(__arm__)
  __asm__ __volatile__("" ::: "memory");
  for (u8 I = 0; I < Count; I++)
    __asm__ __volatile__("yield");
#endif
  __asm__ __volatile__("" ::: "memory");
}

// Platform specific functions.

extern uptr PageSizeCached;
uptr getPageSizeSlow();
inline uptr getPageSizeCached() {
  // Bionic uses a hardcoded value.
  if (SCUDO_ANDROID)
    return 4096U;
  if (LIKELY(PageSizeCached))
    return PageSizeCached;
  return getPageSizeSlow();
}

// Returns 0 if the number of CPUs could not be determined.
u32 getNumberOfCPUs();

const char *getEnv(const char *Name);

u64 getMonotonicTime();

u32 getThreadID();

// Our randomness gathering function is limited to 256 bytes to ensure we get
// as many bytes as requested, and avoid interruptions (on Linux).
constexpr uptr MaxRandomLength = 256U;
bool getRandom(void *Buffer, uptr Length, bool Blocking = false);

// Platform memory mapping functions.

#define MAP_ALLOWNOMEM (1U << 0)
#define MAP_NOACCESS (1U << 1)
#define MAP_RESIZABLE (1U << 2)
#define MAP_MEMTAG (1U << 3)

// Our platform memory mapping use is restricted to 3 scenarios:
// - reserve memory at a random address (MAP_NOACCESS);
// - commit memory in a previously reserved space;
// - commit memory at a random address.
// As such, only a subset of parameters combinations is valid, which is checked
// by the function implementation. The Data parameter allows to pass opaque
// platform specific data to the function.
// Returns nullptr on error or dies if MAP_ALLOWNOMEM is not specified.
void *map(void *Addr, uptr Size, const char *Name, uptr Flags = 0,
          MapPlatformData *Data = nullptr);

// Indicates that we are getting rid of the whole mapping, which might have
// further consequences on Data, depending on the platform.
#define UNMAP_ALL (1U << 0)

void unmap(void *Addr, uptr Size, uptr Flags = 0,
           MapPlatformData *Data = nullptr);

void releasePagesToOS(uptr BaseAddress, uptr Offset, uptr Size,
                      MapPlatformData *Data = nullptr);

// Internal map & unmap fatal error. This must not call map().
void NORETURN dieOnMapUnmapError(bool OutOfMemory = false);

// Logging related functions.

void setAbortMessage(const char *Message);

struct BlockInfo {
  uptr BlockBegin;
  uptr BlockSize;
  uptr RegionBegin;
  uptr RegionEnd;
};

constexpr unsigned char PatternFillByte = 0xAB;

enum FillContentsMode {
  NoFill = 0,
  ZeroFill = 1,
  PatternOrZeroFill = 2 // Pattern fill unless the memory is known to be
                        // zero-initialized already.
};

} // namespace scudo

#endif // SCUDO_COMMON_H_

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Editing: common.h

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