libc/fuzzing/math/SingleInputSingleOutputDiff.h

   1 //===-- Template to diff single-input-single-output functions ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_FUZZING_MATH_SINGLE_INPUT_SINGLE_OUTPUT_DIFF_H
  10 #define LLVM_LIBC_FUZZING_MATH_SINGLE_INPUT_SINGLE_OUTPUT_DIFF_H
  11
  12 #include "fuzzing/math/Compare.h"
  13
  14 #include <stddef.h>
  15 #include <stdint.h>
  16
  17 template <typename T> using SingleInputSingleOutputFunc = T (*)(T);
  18
  19 template <typename T>
  20 void SingleInputSingleOutputDiff(SingleInputSingleOutputFunc<T> func1,
  21                                  SingleInputSingleOutputFunc<T> func2,
  22                                  const uint8_t *data, size_t size) {
  23   if (size < sizeof(T))
  24     return;
  25
  26   T x = *reinterpret_cast<const T *>(data);
  27
  28   T result1 = func1(x);
  29   T result2 = func2(x);
  30
  31   if (!ValuesEqual(result1, result2))
  32     __builtin_trap();
  33 }
  34
  35 template <typename T1, typename T2>
  36 using SingleInputSingleOutputWithSideEffectFunc = T1 (*)(T1, T2 *);
  37
  38 template <typename T1, typename T2>
  39 void SingleInputSingleOutputWithSideEffectDiff(
  40     SingleInputSingleOutputWithSideEffectFunc<T1, T2> func1,
  41     SingleInputSingleOutputWithSideEffectFunc<T1, T2> func2,
  42     const uint8_t *data, size_t size) {
  43   if (size < sizeof(T1))
  44     return;
  45
  46   T1 x = *reinterpret_cast<const T1 *>(data);
  47   T2 sideEffect1, sideEffect2;
  48
  49   T1 result1 = func1(x, &sideEffect1);
  50   T1 result2 = func2(x, &sideEffect2);
  51
  52   if (!ValuesEqual(result1, result2))
  53     __builtin_trap();
  54
  55   if (!ValuesEqual(sideEffect1, sideEffect2))
  56     __builtin_trap();
  57 }
  58
  59 #endif // LLVM_LIBC_FUZZING_MATH_SINGLE_INPUT_SINGLE_OUTPUT_DIFF_H