unittests/Support/NativeFormatTests.cpp

   1 //===- llvm/unittest/Support/NativeFormatTests.cpp - formatting tests -----===//
   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 "llvm/ADT/SmallString.h"
  10 #include "llvm/Support/NativeFormatting.h"
  11 #include "llvm/Support/raw_ostream.h"
  12 #include "gtest/gtest.h"
  13
  14 #include <type_traits>
  15
  16 using namespace llvm;
  17
  18 namespace {
  19
  20 template <typename T> std::string format_number(T N, IntegerStyle Style) {
  21   std::string S;
  22   llvm::raw_string_ostream Str(S);
  23   write_integer(Str, N, 0, Style);
  24   Str.flush();
  25   return S;
  26 }
  27
  28 std::string format_number(uint64_t N, HexPrintStyle Style,
  29                           Optional<size_t> Width = None) {
  30   std::string S;
  31   llvm::raw_string_ostream Str(S);
  32   write_hex(Str, N, Style, Width);
  33   Str.flush();
  34   return S;
  35 }
  36
  37 std::string format_number(double D, FloatStyle Style,
  38                           Optional<size_t> Precision = None) {
  39   std::string S;
  40   llvm::raw_string_ostream Str(S);
  41   write_double(Str, D, Style, Precision);
  42   Str.flush();
  43   return S;
  44 }
  45
  46 // Test basic number formatting with various styles and default width and
  47 // precision.
  48 TEST(NativeFormatTest, BasicIntegerTests) {
  49   // Simple integers with no decimal.
  50   EXPECT_EQ("0", format_number(0, IntegerStyle::Integer));
  51   EXPECT_EQ("2425", format_number(2425, IntegerStyle::Integer));
  52   EXPECT_EQ("-2425", format_number(-2425, IntegerStyle::Integer));
  53
  54   EXPECT_EQ("0", format_number(0LL, IntegerStyle::Integer));
  55   EXPECT_EQ("257257257235709",
  56             format_number(257257257235709LL, IntegerStyle::Integer));
  57   EXPECT_EQ("-257257257235709",
  58             format_number(-257257257235709LL, IntegerStyle::Integer));
  59
  60   // Number formatting.
  61   EXPECT_EQ("0", format_number(0, IntegerStyle::Number));
  62   EXPECT_EQ("2,425", format_number(2425, IntegerStyle::Number));
  63   EXPECT_EQ("-2,425", format_number(-2425, IntegerStyle::Number));
  64   EXPECT_EQ("257,257,257,235,709",
  65             format_number(257257257235709LL, IntegerStyle::Number));
  66   EXPECT_EQ("-257,257,257,235,709",
  67             format_number(-257257257235709LL, IntegerStyle::Number));
  68
  69   // Hex formatting.
  70   // lower case, prefix.
  71   EXPECT_EQ("0x0", format_number(0, HexPrintStyle::PrefixLower));
  72   EXPECT_EQ("0xbeef", format_number(0xbeefLL, HexPrintStyle::PrefixLower));
  73   EXPECT_EQ("0xdeadbeef",
  74             format_number(0xdeadbeefLL, HexPrintStyle::PrefixLower));
  75
  76   // upper-case, prefix.
  77   EXPECT_EQ("0x0", format_number(0, HexPrintStyle::PrefixUpper));
  78   EXPECT_EQ("0xBEEF", format_number(0xbeefLL, HexPrintStyle::PrefixUpper));
  79   EXPECT_EQ("0xDEADBEEF",
  80             format_number(0xdeadbeefLL, HexPrintStyle::PrefixUpper));
  81
  82   // lower-case, no prefix
  83   EXPECT_EQ("0", format_number(0, HexPrintStyle::Lower));
  84   EXPECT_EQ("beef", format_number(0xbeefLL, HexPrintStyle::Lower));
  85   EXPECT_EQ("deadbeef", format_number(0xdeadbeefLL, HexPrintStyle::Lower));
  86
  87   // upper-case, no prefix.
  88   EXPECT_EQ("0", format_number(0, HexPrintStyle::Upper));
  89   EXPECT_EQ("BEEF", format_number(0xbeef, HexPrintStyle::Upper));
  90   EXPECT_EQ("DEADBEEF", format_number(0xdeadbeef, HexPrintStyle::Upper));
  91 }
  92
  93 // Test basic floating point formatting with various styles and default width
  94 // and precision.
  95 TEST(NativeFormatTest, BasicFloatingPointTests) {
  96   // Double
  97   EXPECT_EQ("0.000000e+00", format_number(0.0, FloatStyle::Exponent));
  98   EXPECT_EQ("-0.000000e+00", format_number(-0.0, FloatStyle::Exponent));
  99   EXPECT_EQ("1.100000e+00", format_number(1.1, FloatStyle::Exponent));
 100   EXPECT_EQ("1.100000E+00", format_number(1.1, FloatStyle::ExponentUpper));
 101
 102   // Default precision is 2 for floating points.
 103   EXPECT_EQ("1.10", format_number(1.1, FloatStyle::Fixed));
 104   EXPECT_EQ("1.34", format_number(1.34, FloatStyle::Fixed));
 105   EXPECT_EQ("1.34", format_number(1.344, FloatStyle::Fixed));
 106   EXPECT_EQ("1.35", format_number(1.346, FloatStyle::Fixed));
 107 }
 108
 109 // Test common boundary cases and min/max conditions.
 110 TEST(NativeFormatTest, BoundaryTests) {
 111   // Min and max.
 112   EXPECT_EQ("18446744073709551615",
 113             format_number(UINT64_MAX, IntegerStyle::Integer));
 114
 115   EXPECT_EQ("9223372036854775807",
 116             format_number(INT64_MAX, IntegerStyle::Integer));
 117   EXPECT_EQ("-9223372036854775808",
 118             format_number(INT64_MIN, IntegerStyle::Integer));
 119
 120   EXPECT_EQ("4294967295", format_number(UINT32_MAX, IntegerStyle::Integer));
 121   EXPECT_EQ("2147483647", format_number(INT32_MAX, IntegerStyle::Integer));
 122   EXPECT_EQ("-2147483648", format_number(INT32_MIN, IntegerStyle::Integer));
 123
 124   EXPECT_EQ("nan", format_number(std::numeric_limits<double>::quiet_NaN(),
 125                                  FloatStyle::Fixed));
 126   EXPECT_EQ("INF", format_number(std::numeric_limits<double>::infinity(),
 127                                  FloatStyle::Fixed));
 128 }
 129
 130 TEST(NativeFormatTest, HexTests) {
 131   // Test hex formatting with different widths and precisions.
 132
 133   // Width less than the value should print the full value anyway.
 134   EXPECT_EQ("0x0", format_number(0, HexPrintStyle::PrefixLower, 0));
 135   EXPECT_EQ("0xabcde", format_number(0xABCDE, HexPrintStyle::PrefixLower, 3));
 136
 137   // Precision greater than the value should pad with 0s.
 138   // TODO: The prefix should not be counted in the precision.  But unfortunately
 139   // it is and we have to live with it unless we fix all existing users of
 140   // prefixed hex formatting.
 141   EXPECT_EQ("0x000", format_number(0, HexPrintStyle::PrefixLower, 5));
 142   EXPECT_EQ("0x0abcde", format_number(0xABCDE, HexPrintStyle::PrefixLower, 8));
 143
 144   EXPECT_EQ("00000", format_number(0, HexPrintStyle::Lower, 5));
 145   EXPECT_EQ("000abcde", format_number(0xABCDE, HexPrintStyle::Lower, 8));
 146
 147   // Try printing more digits than can fit in a uint64.
 148   EXPECT_EQ("0x00000000000000abcde",
 149             format_number(0xABCDE, HexPrintStyle::PrefixLower, 21));
 150 }
 151
 152 TEST(NativeFormatTest, IntegerTests) {
 153   EXPECT_EQ("-10", format_number(-10, IntegerStyle::Integer));
 154   EXPECT_EQ("-100", format_number(-100, IntegerStyle::Integer));
 155   EXPECT_EQ("-1000", format_number(-1000, IntegerStyle::Integer));
 156   EXPECT_EQ("-1234567890", format_number(-1234567890, IntegerStyle::Integer));
 157   EXPECT_EQ("10", format_number(10, IntegerStyle::Integer));
 158   EXPECT_EQ("100", format_number(100, IntegerStyle::Integer));
 159   EXPECT_EQ("1000", format_number(1000, IntegerStyle::Integer));
 160   EXPECT_EQ("1234567890", format_number(1234567890, IntegerStyle::Integer));
 161 }
 162
 163 TEST(NativeFormatTest, CommaTests) {
 164   EXPECT_EQ("0", format_number(0, IntegerStyle::Number));
 165   EXPECT_EQ("10", format_number(10, IntegerStyle::Number));
 166   EXPECT_EQ("100", format_number(100, IntegerStyle::Number));
 167   EXPECT_EQ("1,000", format_number(1000, IntegerStyle::Number));
 168   EXPECT_EQ("1,234,567,890", format_number(1234567890, IntegerStyle::Number));
 169
 170   EXPECT_EQ("-10", format_number(-10, IntegerStyle::Number));
 171   EXPECT_EQ("-100", format_number(-100, IntegerStyle::Number));
 172   EXPECT_EQ("-1,000", format_number(-1000, IntegerStyle::Number));
 173   EXPECT_EQ("-1,234,567,890", format_number(-1234567890, IntegerStyle::Number));
 174 }
 175 }