libc/test/UnitTest/MemoryMatcher.cpp

   1 //===-- MemoryMatcher.cpp ---------------------------------------*- 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 #include "MemoryMatcher.h"
  10
  11 #include "test/UnitTest/Test.h"
  12
  13 using LIBC_NAMESPACE::testing::tlog;
  14
  15 namespace LIBC_NAMESPACE {
  16 namespace testing {
  17
  18 template <typename T>
  19 bool equals(const cpp::span<T> &Span1, const cpp::span<T> &Span2,
  20             bool &mismatch_size, size_t &mismatch_index) {
  21   if (Span1.size() != Span2.size()) {
  22     mismatch_size = true;
  23     return false;
  24   }
  25   for (size_t Index = 0; Index < Span1.size(); ++Index)
  26     if (Span1[Index] != Span2[Index]) {
  27       mismatch_index = Index;
  28       return false;
  29     }
  30   return true;
  31 }
  32
  33 bool MemoryMatcher::match(MemoryView actualValue) {
  34   actual = actualValue;
  35   return equals(expected, actual, mismatch_size, mismatch_index);
  36 }
  37
  38 static void display(char C) {
  39   const auto print = [](unsigned char I) {
  40     tlog << static_cast<char>(I < 10 ? '0' + I : 'A' + I - 10);
  41   };
  42   print(static_cast<unsigned char>(C) / 16);
  43   print(static_cast<unsigned char>(C) & 15);
  44 }
  45
  46 static void display(MemoryView View) {
  47   for (auto C : View) {
  48     tlog << ' ';
  49     display(C);
  50   }
  51 }
  52
  53 void MemoryMatcher::explainError() {
  54   if (mismatch_size) {
  55     tlog << "Size mismatch :";
  56     tlog << "expected : ";
  57     tlog << expected.size();
  58     tlog << '\n';
  59     tlog << "actual   : ";
  60     tlog << actual.size();
  61     tlog << '\n';
  62   } else {
  63     tlog << "Mismatch at position : ";
  64     tlog << mismatch_index;
  65     tlog << " / ";
  66     tlog << expected.size();
  67     tlog << "\n";
  68     tlog << "expected :";
  69     display(expected);
  70     tlog << '\n';
  71     tlog << "actual   :";
  72     display(actual);
  73     tlog << '\n';
  74   }
  75 }
  76
  77 } // namespace testing
  78 } // namespace LIBC_NAMESPACE