osb/source/test/gtest/gtest-printers.cc

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// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Google Test - The Google C++ Testing and Mocking Framework
//
// This file implements a universal value printer that can print a
// value of any type T:
//
// void ::testing::internal::UniversalPrinter<T>::Print(value, ostream_ptr);
//
// It uses the << operator when possible, and prints the bytes in the
// object otherwise. A user can override its behavior for a class
// type Foo by defining either operator<<(::std::ostream&, const Foo&)
// or void PrintTo(const Foo&, ::std::ostream*) in the namespace that
// defines Foo.
#include "gtest/gtest-printers.h"
#include <stdio.h>
#include <cctype>
#include <cstdint>
#include <cwchar>
#include <ostream> // NOLINT
#include <string>
#include <type_traits>
#include "internal/gtest-port.h"
#include "gtest-internal-inl.h"
namespace testing {
namespace {
using ::std::ostream;
// Prints a segment of bytes in the given object.
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_
GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_
void PrintByteSegmentInObjectTo(const unsigned char* obj_bytes, size_t start,
size_t count, ostream* os) {
char text[5] = "";
for (size_t i = 0; i != count; i++) {
const size_t j = start + i;
if (i != 0) {
// Organizes the bytes into groups of 2 for easy parsing by
// human.
if ((j % 2) == 0)
*os << ' ';
else
*os << '-';
}
GTEST_SNPRINTF_(text, sizeof(text), "%02X", obj_bytes[j]);
*os << text;
}
}
// Prints the bytes in the given value to the given ostream.
void PrintBytesInObjectToImpl(const unsigned char* obj_bytes, size_t count,
ostream* os) {
// Tells the user how big the object is.
*os << count << "-byte object <";
const size_t kThreshold = 132;
const size_t kChunkSize = 64;
// If the object size is bigger than kThreshold, we'll have to omit
// some details by printing only the first and the last kChunkSize
// bytes.
if (count < kThreshold) {
PrintByteSegmentInObjectTo(obj_bytes, 0, count, os);
} else {
PrintByteSegmentInObjectTo(obj_bytes, 0, kChunkSize, os);
*os << " ... ";
// Rounds up to 2-byte boundary.
const size_t resume_pos = (count - kChunkSize + 1) / 2 * 2;
PrintByteSegmentInObjectTo(obj_bytes, resume_pos, count - resume_pos, os);
}
*os << ">";
}
// Helpers for widening a character to char32_t. Since the standard does not
// specify if char / wchar_t is signed or unsigned, it is important to first
// convert it to the unsigned type of the same width before widening it to
// char32_t.
template <typename CharType>
char32_t ToChar32(CharType in) {
return static_cast<char32_t>(
static_cast<typename std::make_unsigned<CharType>::type>(in));
}
} // namespace
namespace internal {
// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
// given object. The delegation simplifies the implementation, which
// uses the << operator and thus is easier done outside of the
// ::testing::internal namespace, which contains a << operator that
// sometimes conflicts with the one in STL.
void PrintBytesInObjectTo(const unsigned char* obj_bytes, size_t count,
ostream* os) {
PrintBytesInObjectToImpl(obj_bytes, count, os);
}
// Depending on the value of a char (or wchar_t), we print it in one
// of three formats:
// - as is if it's a printable ASCII (e.g. 'a', '2', ' '),
// - as a hexadecimal escape sequence (e.g. '\x7F'), or
// - as a special escape sequence (e.g. '\r', '\n').
enum CharFormat { kAsIs, kHexEscape, kSpecialEscape };
// Returns true if c is a printable ASCII character. We test the
// value of c directly instead of calling isprint(), which is buggy on
// Windows Mobile.
inline bool IsPrintableAscii(char32_t c) { return 0x20 <= c && c <= 0x7E; }
// Prints c (of type char, char8_t, char16_t, char32_t, or wchar_t) as a
// character literal without the quotes, escaping it when necessary; returns how
// c was formatted.
template <typename Char>
static CharFormat PrintAsCharLiteralTo(Char c, ostream* os) {
const char32_t u_c = ToChar32(c);
switch (u_c) {
case L'\0':
*os << "\\0";
break;
case L'\'':
*os << "\\'";
break;
case L'\\':
*os << "\\\\";
break;
case L'\a':
*os << "\\a";
break;
case L'\b':
*os << "\\b";
break;
case L'\f':
*os << "\\f";
break;
case L'\n':
*os << "\\n";
break;
case L'\r':
*os << "\\r";
break;
case L'\t':
*os << "\\t";
break;
case L'\v':
*os << "\\v";
break;
default:
if (IsPrintableAscii(u_c)) {
*os << static_cast<char>(c);
return kAsIs;
} else {
ostream::fmtflags flags = os->flags();
*os << "\\x" << std::hex << std::uppercase << static_cast<int>(u_c);
os->flags(flags);
return kHexEscape;
}
}
return kSpecialEscape;
}
// Prints a char32_t c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char32_t c, ostream* os) {
switch (c) {
case L'\'':
*os << "'";
return kAsIs;
case L'"':
*os << "\\\"";
return kSpecialEscape;
default:
return PrintAsCharLiteralTo(c, os);
}
}
static const char* GetCharWidthPrefix(char) { return ""; }
static const char* GetCharWidthPrefix(signed char) { return ""; }
static const char* GetCharWidthPrefix(unsigned char) { return ""; }
#ifdef __cpp_char8_t
static const char* GetCharWidthPrefix(char8_t) { return "u8"; }
#endif
static const char* GetCharWidthPrefix(char16_t) { return "u"; }
static const char* GetCharWidthPrefix(char32_t) { return "U"; }
static const char* GetCharWidthPrefix(wchar_t) { return "L"; }
// Prints a char c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char c, ostream* os) {
return PrintAsStringLiteralTo(ToChar32(c), os);
}
#ifdef __cpp_char8_t
static CharFormat PrintAsStringLiteralTo(char8_t c, ostream* os) {
return PrintAsStringLiteralTo(ToChar32(c), os);
}
#endif
static CharFormat PrintAsStringLiteralTo(char16_t c, ostream* os) {
return PrintAsStringLiteralTo(ToChar32(c), os);
}
static CharFormat PrintAsStringLiteralTo(wchar_t c, ostream* os) {
return PrintAsStringLiteralTo(ToChar32(c), os);
}
// Prints a character c (of type char, char8_t, char16_t, char32_t, or wchar_t)
// and its code. '\0' is printed as "'\\0'", other unprintable characters are
// also properly escaped using the standard C++ escape sequence.
template <typename Char>
void PrintCharAndCodeTo(Char c, ostream* os) {
// First, print c as a literal in the most readable form we can find.
*os << GetCharWidthPrefix(c) << "'";
const CharFormat format = PrintAsCharLiteralTo(c, os);
*os << "'";
// To aid user debugging, we also print c's code in decimal, unless
// it's 0 (in which case c was printed as '\\0', making the code
// obvious).
if (c == 0) return;
*os << " (" << static_cast<int>(c);
// For more convenience, we print c's code again in hexadecimal,
// unless c was already printed in the form '\x##' or the code is in
// [1, 9].
if (format == kHexEscape || (1 <= c && c <= 9)) {
// Do nothing.
} else {
*os << ", 0x" << String::FormatHexInt(static_cast<int>(c));
}
*os << ")";
}
void PrintTo(unsigned char c, ::std::ostream* os) { PrintCharAndCodeTo(c, os); }
void PrintTo(signed char c, ::std::ostream* os) { PrintCharAndCodeTo(c, os); }
// Prints a wchar_t as a symbol if it is printable or as its internal
// code otherwise and also as its code. L'\0' is printed as "L'\\0'".
void PrintTo(wchar_t wc, ostream* os) { PrintCharAndCodeTo(wc, os); }
// TODO(dcheng): Consider making this delegate to PrintCharAndCodeTo() as well.
void PrintTo(char32_t c, ::std::ostream* os) {
*os << std::hex << "U+" << std::uppercase << std::setfill('0') << std::setw(4)
<< static_cast<uint32_t>(c);
}
// gcc/clang __{u,}int128_t
#if defined(__SIZEOF_INT128__)
void PrintTo(__uint128_t v, ::std::ostream* os) {
if (v == 0) {
*os << "0";
return;
}
// Buffer large enough for ceil(log10(2^128))==39 and the null terminator
char buf[40];
char* p = buf + sizeof(buf);
// Some configurations have a __uint128_t, but no support for built in
// division. Do manual long division instead.
uint64_t high = static_cast<uint64_t>(v >> 64);
uint64_t low = static_cast<uint64_t>(v);
*--p = 0;
while (high != 0 || low != 0) {
uint64_t high_mod = high % 10;
high = high / 10;
// This is the long division algorithm specialized for a divisor of 10 and
// only two elements.
// Notable values:
// 2^64 / 10 == 1844674407370955161
// 2^64 % 10 == 6
const uint64_t carry = 6 * high_mod + low % 10;
low = low / 10 + high_mod * 1844674407370955161 + carry / 10;
char digit = static_cast<char>(carry % 10);
*--p = static_cast<char>('0' + digit);
}
*os << p;
}
void PrintTo(__int128_t v, ::std::ostream* os) {
__uint128_t uv = static_cast<__uint128_t>(v);
if (v < 0) {
*os << "-";
uv = -uv;
}
PrintTo(uv, os);
}
#endif // __SIZEOF_INT128__
// Prints the given array of characters to the ostream. CharType must be either
// char, char8_t, char16_t, char32_t, or wchar_t.
// The array starts at begin, the length is len, it may include '\0' characters
// and may not be NUL-terminated.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_ GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_ static CharFormat
PrintCharsAsStringTo(const CharType* begin, size_t len, ostream* os) {
const char* const quote_prefix = GetCharWidthPrefix(*begin);
*os << quote_prefix << "\"";
bool is_previous_hex = false;
CharFormat print_format = kAsIs;
for (size_t index = 0; index < len; ++index) {
const CharType cur = begin[index];
if (is_previous_hex && IsXDigit(cur)) {
// Previous character is of '\x..' form and this character can be
// interpreted as another hexadecimal digit in its number. Break string to
// disambiguate.
*os << "\" " << quote_prefix << "\"";
}
is_previous_hex = PrintAsStringLiteralTo(cur, os) == kHexEscape;
// Remember if any characters required hex escaping.
if (is_previous_hex) {
print_format = kHexEscape;
}
}
*os << "\"";
return print_format;
}
// Prints a (const) char/wchar_t array of 'len' elements, starting at address
// 'begin'. CharType must be either char or wchar_t.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_ GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_ static void
UniversalPrintCharArray(const CharType* begin, size_t len,
ostream* os) {
// The code
// const char kFoo[] = "foo";
// generates an array of 4, not 3, elements, with the last one being '\0'.
//
// Therefore when printing a char array, we don't print the last element if
// it's '\0', such that the output matches the string literal as it's
// written in the source code.
if (len > 0 && begin[len - 1] == '\0') {
PrintCharsAsStringTo(begin, len - 1, os);
return;
}
// If, however, the last element in the array is not '\0', e.g.
// const char kFoo[] = { 'f', 'o', 'o' };
// we must print the entire array. We also print a message to indicate
// that the array is not NUL-terminated.
PrintCharsAsStringTo(begin, len, os);
*os << " (no terminating NUL)";
}
// Prints a (const) char array of 'len' elements, starting at address 'begin'.
void UniversalPrintArray(const char* begin, size_t len, ostream* os) {
UniversalPrintCharArray(begin, len, os);
}
#ifdef __cpp_char8_t
// Prints a (const) char8_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char8_t* begin, size_t len, ostream* os) {
UniversalPrintCharArray(begin, len, os);
}
#endif
// Prints a (const) char16_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char16_t* begin, size_t len, ostream* os) {
UniversalPrintCharArray(begin, len, os);
}
// Prints a (const) char32_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char32_t* begin, size_t len, ostream* os) {
UniversalPrintCharArray(begin, len, os);
}
// Prints a (const) wchar_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const wchar_t* begin, size_t len, ostream* os) {
UniversalPrintCharArray(begin, len, os);
}
namespace {
// Prints a null-terminated C-style string to the ostream.
template <typename Char>
void PrintCStringTo(const Char* s, ostream* os) {
if (s == nullptr) {
*os << "NULL";
} else {
*os << ImplicitCast_<const void*>(s) << " pointing to ";
PrintCharsAsStringTo(s, std::char_traits<Char>::length(s), os);
}
}
} // anonymous namespace
void PrintTo(const char* s, ostream* os) { PrintCStringTo(s, os); }
#ifdef __cpp_char8_t
void PrintTo(const char8_t* s, ostream* os) { PrintCStringTo(s, os); }
#endif
void PrintTo(const char16_t* s, ostream* os) { PrintCStringTo(s, os); }
void PrintTo(const char32_t* s, ostream* os) { PrintCStringTo(s, os); }
// MSVC compiler can be configured to define whar_t as a typedef
// of unsigned short. Defining an overload for const wchar_t* in that case
// would cause pointers to unsigned shorts be printed as wide strings,
// possibly accessing more memory than intended and causing invalid
// memory accesses. MSVC defines _NATIVE_WCHAR_T_DEFINED symbol when
// wchar_t is implemented as a native type.
#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
// Prints the given wide C string to the ostream.
void PrintTo(const wchar_t* s, ostream* os) { PrintCStringTo(s, os); }
#endif // wchar_t is native
namespace {
bool ContainsUnprintableControlCodes(const char* str, size_t length) {
const unsigned char* s = reinterpret_cast<const unsigned char*>(str);
for (size_t i = 0; i < length; i++) {
unsigned char ch = *s++;
if (std::iscntrl(ch)) {
switch (ch) {
case '\t':
case '\n':
case '\r':
break;
default:
return true;
}
}
}
return false;
}
bool IsUTF8TrailByte(unsigned char t) { return 0x80 <= t && t <= 0xbf; }
bool IsValidUTF8(const char* str, size_t length) {
const unsigned char* s = reinterpret_cast<const unsigned char*>(str);
for (size_t i = 0; i < length;) {
unsigned char lead = s[i++];
if (lead <= 0x7f) {
continue; // single-byte character (ASCII) 0..7F
}
if (lead < 0xc2) {
return false; // trail byte or non-shortest form
} else if (lead <= 0xdf && (i + 1) <= length && IsUTF8TrailByte(s[i])) {
++i; // 2-byte character
} else if (0xe0 <= lead && lead <= 0xef && (i + 2) <= length &&
IsUTF8TrailByte(s[i]) && IsUTF8TrailByte(s[i + 1]) &&
// check for non-shortest form and surrogate
(lead != 0xe0 || s[i] >= 0xa0) &&
(lead != 0xed || s[i] < 0xa0)) {
i += 2; // 3-byte character
} else if (0xf0 <= lead && lead <= 0xf4 && (i + 3) <= length &&
IsUTF8TrailByte(s[i]) && IsUTF8TrailByte(s[i + 1]) &&
IsUTF8TrailByte(s[i + 2]) &&
// check for non-shortest form
(lead != 0xf0 || s[i] >= 0x90) &&
(lead != 0xf4 || s[i] < 0x90)) {
i += 3; // 4-byte character
} else {
return false;
}
}
return true;
}
void ConditionalPrintAsText(const char* str, size_t length, ostream* os) {
if (!ContainsUnprintableControlCodes(str, length) &&
IsValidUTF8(str, length)) {
*os << "\n As Text: \"" << str << "\"";
}
}
} // anonymous namespace
void PrintStringTo(const ::std::string& s, ostream* os) {
if (PrintCharsAsStringTo(s.data(), s.size(), os) == kHexEscape) {
if (GTEST_FLAG_GET(print_utf8)) {
ConditionalPrintAsText(s.data(), s.size(), os);
}
}
}
#ifdef __cpp_char8_t
void PrintU8StringTo(const ::std::u8string& s, ostream* os) {
PrintCharsAsStringTo(s.data(), s.size(), os);
}
#endif
void PrintU16StringTo(const ::std::u16string& s, ostream* os) {
PrintCharsAsStringTo(s.data(), s.size(), os);
}
void PrintU32StringTo(const ::std::u32string& s, ostream* os) {
PrintCharsAsStringTo(s.data(), s.size(), os);
}
#if GTEST_HAS_STD_WSTRING
void PrintWideStringTo(const ::std::wstring& s, ostream* os) {
PrintCharsAsStringTo(s.data(), s.size(), os);
}
#endif // GTEST_HAS_STD_WSTRING
} // namespace internal
} // namespace testing