diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/strings/charconv_test.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/strings/charconv_test.cc | 780 |
1 files changed, 0 insertions, 780 deletions
diff --git a/third_party/abseil_cpp/absl/strings/charconv_test.cc b/third_party/abseil_cpp/absl/strings/charconv_test.cc deleted file mode 100644 index 9090e9c89c50..000000000000 --- a/third_party/abseil_cpp/absl/strings/charconv_test.cc +++ /dev/null @@ -1,780 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// https://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include "absl/strings/charconv.h" - -#include <cstdlib> -#include <string> - -#include "gmock/gmock.h" -#include "gtest/gtest.h" -#include "absl/strings/internal/pow10_helper.h" -#include "absl/strings/str_cat.h" -#include "absl/strings/str_format.h" - -#ifdef _MSC_FULL_VER -#define ABSL_COMPILER_DOES_EXACT_ROUNDING 0 -#define ABSL_STRTOD_HANDLES_NAN_CORRECTLY 0 -#else -#define ABSL_COMPILER_DOES_EXACT_ROUNDING 1 -#define ABSL_STRTOD_HANDLES_NAN_CORRECTLY 1 -#endif - -namespace { - -using absl::strings_internal::Pow10; - -#if ABSL_COMPILER_DOES_EXACT_ROUNDING - -// Tests that the given string is accepted by absl::from_chars, and that it -// converts exactly equal to the given number. -void TestDoubleParse(absl::string_view str, double expected_number) { - SCOPED_TRACE(str); - double actual_number = 0.0; - absl::from_chars_result result = - absl::from_chars(str.data(), str.data() + str.length(), actual_number); - EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(result.ptr, str.data() + str.length()); - EXPECT_EQ(actual_number, expected_number); -} - -void TestFloatParse(absl::string_view str, float expected_number) { - SCOPED_TRACE(str); - float actual_number = 0.0; - absl::from_chars_result result = - absl::from_chars(str.data(), str.data() + str.length(), actual_number); - EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(result.ptr, str.data() + str.length()); - EXPECT_EQ(actual_number, expected_number); -} - -// Tests that the given double or single precision floating point literal is -// parsed correctly by absl::from_chars. -// -// These convenience macros assume that the C++ compiler being used also does -// fully correct decimal-to-binary conversions. -#define FROM_CHARS_TEST_DOUBLE(number) \ - { \ - TestDoubleParse(#number, number); \ - TestDoubleParse("-" #number, -number); \ - } - -#define FROM_CHARS_TEST_FLOAT(number) \ - { \ - TestFloatParse(#number, number##f); \ - TestFloatParse("-" #number, -number##f); \ - } - -TEST(FromChars, NearRoundingCases) { - // Cases from "A Program for Testing IEEE Decimal-Binary Conversion" - // by Vern Paxson. - - // Forms that should round towards zero. (These are the hardest cases for - // each decimal mantissa size.) - FROM_CHARS_TEST_DOUBLE(5.e125); - FROM_CHARS_TEST_DOUBLE(69.e267); - FROM_CHARS_TEST_DOUBLE(999.e-026); - FROM_CHARS_TEST_DOUBLE(7861.e-034); - FROM_CHARS_TEST_DOUBLE(75569.e-254); - FROM_CHARS_TEST_DOUBLE(928609.e-261); - FROM_CHARS_TEST_DOUBLE(9210917.e080); - FROM_CHARS_TEST_DOUBLE(84863171.e114); - FROM_CHARS_TEST_DOUBLE(653777767.e273); - FROM_CHARS_TEST_DOUBLE(5232604057.e-298); - FROM_CHARS_TEST_DOUBLE(27235667517.e-109); - FROM_CHARS_TEST_DOUBLE(653532977297.e-123); - FROM_CHARS_TEST_DOUBLE(3142213164987.e-294); - FROM_CHARS_TEST_DOUBLE(46202199371337.e-072); - FROM_CHARS_TEST_DOUBLE(231010996856685.e-073); - FROM_CHARS_TEST_DOUBLE(9324754620109615.e212); - FROM_CHARS_TEST_DOUBLE(78459735791271921.e049); - FROM_CHARS_TEST_DOUBLE(272104041512242479.e200); - FROM_CHARS_TEST_DOUBLE(6802601037806061975.e198); - FROM_CHARS_TEST_DOUBLE(20505426358836677347.e-221); - FROM_CHARS_TEST_DOUBLE(836168422905420598437.e-234); - FROM_CHARS_TEST_DOUBLE(4891559871276714924261.e222); - FROM_CHARS_TEST_FLOAT(5.e-20); - FROM_CHARS_TEST_FLOAT(67.e14); - FROM_CHARS_TEST_FLOAT(985.e15); - FROM_CHARS_TEST_FLOAT(7693.e-42); - FROM_CHARS_TEST_FLOAT(55895.e-16); - FROM_CHARS_TEST_FLOAT(996622.e-44); - FROM_CHARS_TEST_FLOAT(7038531.e-32); - FROM_CHARS_TEST_FLOAT(60419369.e-46); - FROM_CHARS_TEST_FLOAT(702990899.e-20); - FROM_CHARS_TEST_FLOAT(6930161142.e-48); - FROM_CHARS_TEST_FLOAT(25933168707.e-13); - FROM_CHARS_TEST_FLOAT(596428896559.e20); - - // Similarly, forms that should round away from zero. - FROM_CHARS_TEST_DOUBLE(9.e-265); - FROM_CHARS_TEST_DOUBLE(85.e-037); - FROM_CHARS_TEST_DOUBLE(623.e100); - FROM_CHARS_TEST_DOUBLE(3571.e263); - FROM_CHARS_TEST_DOUBLE(81661.e153); - FROM_CHARS_TEST_DOUBLE(920657.e-023); - FROM_CHARS_TEST_DOUBLE(4603285.e-024); - FROM_CHARS_TEST_DOUBLE(87575437.e-309); - FROM_CHARS_TEST_DOUBLE(245540327.e122); - FROM_CHARS_TEST_DOUBLE(6138508175.e120); - FROM_CHARS_TEST_DOUBLE(83356057653.e193); - FROM_CHARS_TEST_DOUBLE(619534293513.e124); - FROM_CHARS_TEST_DOUBLE(2335141086879.e218); - FROM_CHARS_TEST_DOUBLE(36167929443327.e-159); - FROM_CHARS_TEST_DOUBLE(609610927149051.e-255); - FROM_CHARS_TEST_DOUBLE(3743626360493413.e-165); - FROM_CHARS_TEST_DOUBLE(94080055902682397.e-242); - FROM_CHARS_TEST_DOUBLE(899810892172646163.e283); - FROM_CHARS_TEST_DOUBLE(7120190517612959703.e120); - FROM_CHARS_TEST_DOUBLE(25188282901709339043.e-252); - FROM_CHARS_TEST_DOUBLE(308984926168550152811.e-052); - FROM_CHARS_TEST_DOUBLE(6372891218502368041059.e064); - FROM_CHARS_TEST_FLOAT(3.e-23); - FROM_CHARS_TEST_FLOAT(57.e18); - FROM_CHARS_TEST_FLOAT(789.e-35); - FROM_CHARS_TEST_FLOAT(2539.e-18); - FROM_CHARS_TEST_FLOAT(76173.e28); - FROM_CHARS_TEST_FLOAT(887745.e-11); - FROM_CHARS_TEST_FLOAT(5382571.e-37); - FROM_CHARS_TEST_FLOAT(82381273.e-35); - FROM_CHARS_TEST_FLOAT(750486563.e-38); - FROM_CHARS_TEST_FLOAT(3752432815.e-39); - FROM_CHARS_TEST_FLOAT(75224575729.e-45); - FROM_CHARS_TEST_FLOAT(459926601011.e15); -} - -#undef FROM_CHARS_TEST_DOUBLE -#undef FROM_CHARS_TEST_FLOAT -#endif - -float ToFloat(absl::string_view s) { - float f; - absl::from_chars(s.data(), s.data() + s.size(), f); - return f; -} - -double ToDouble(absl::string_view s) { - double d; - absl::from_chars(s.data(), s.data() + s.size(), d); - return d; -} - -// A duplication of the test cases in "NearRoundingCases" above, but with -// expected values expressed with integers, using ldexp/ldexpf. These test -// cases will work even on compilers that do not accurately round floating point -// literals. -TEST(FromChars, NearRoundingCasesExplicit) { - EXPECT_EQ(ToDouble("5.e125"), ldexp(6653062250012735, 365)); - EXPECT_EQ(ToDouble("69.e267"), ldexp(4705683757438170, 841)); - EXPECT_EQ(ToDouble("999.e-026"), ldexp(6798841691080350, -129)); - EXPECT_EQ(ToDouble("7861.e-034"), ldexp(8975675289889240, -153)); - EXPECT_EQ(ToDouble("75569.e-254"), ldexp(6091718967192243, -880)); - EXPECT_EQ(ToDouble("928609.e-261"), ldexp(7849264900213743, -900)); - EXPECT_EQ(ToDouble("9210917.e080"), ldexp(8341110837370930, 236)); - EXPECT_EQ(ToDouble("84863171.e114"), ldexp(4625202867375927, 353)); - EXPECT_EQ(ToDouble("653777767.e273"), ldexp(5068902999763073, 884)); - EXPECT_EQ(ToDouble("5232604057.e-298"), ldexp(5741343011915040, -1010)); - EXPECT_EQ(ToDouble("27235667517.e-109"), ldexp(6707124626673586, -380)); - EXPECT_EQ(ToDouble("653532977297.e-123"), ldexp(7078246407265384, -422)); - EXPECT_EQ(ToDouble("3142213164987.e-294"), ldexp(8219991337640559, -988)); - EXPECT_EQ(ToDouble("46202199371337.e-072"), ldexp(5224462102115359, -246)); - EXPECT_EQ(ToDouble("231010996856685.e-073"), ldexp(5224462102115359, -247)); - EXPECT_EQ(ToDouble("9324754620109615.e212"), ldexp(5539753864394442, 705)); - EXPECT_EQ(ToDouble("78459735791271921.e049"), ldexp(8388176519442766, 166)); - EXPECT_EQ(ToDouble("272104041512242479.e200"), ldexp(5554409530847367, 670)); - EXPECT_EQ(ToDouble("6802601037806061975.e198"), ldexp(5554409530847367, 668)); - EXPECT_EQ(ToDouble("20505426358836677347.e-221"), - ldexp(4524032052079546, -722)); - EXPECT_EQ(ToDouble("836168422905420598437.e-234"), - ldexp(5070963299887562, -760)); - EXPECT_EQ(ToDouble("4891559871276714924261.e222"), - ldexp(6452687840519111, 757)); - EXPECT_EQ(ToFloat("5.e-20"), ldexpf(15474250, -88)); - EXPECT_EQ(ToFloat("67.e14"), ldexpf(12479722, 29)); - EXPECT_EQ(ToFloat("985.e15"), ldexpf(14333636, 36)); - EXPECT_EQ(ToFloat("7693.e-42"), ldexpf(10979816, -150)); - EXPECT_EQ(ToFloat("55895.e-16"), ldexpf(12888509, -61)); - EXPECT_EQ(ToFloat("996622.e-44"), ldexpf(14224264, -150)); - EXPECT_EQ(ToFloat("7038531.e-32"), ldexpf(11420669, -107)); - EXPECT_EQ(ToFloat("60419369.e-46"), ldexpf(8623340, -150)); - EXPECT_EQ(ToFloat("702990899.e-20"), ldexpf(16209866, -61)); - EXPECT_EQ(ToFloat("6930161142.e-48"), ldexpf(9891056, -150)); - EXPECT_EQ(ToFloat("25933168707.e-13"), ldexpf(11138211, -32)); - EXPECT_EQ(ToFloat("596428896559.e20"), ldexpf(12333860, 82)); - - - EXPECT_EQ(ToDouble("9.e-265"), ldexp(8168427841980010, -930)); - EXPECT_EQ(ToDouble("85.e-037"), ldexp(6360455125664090, -169)); - EXPECT_EQ(ToDouble("623.e100"), ldexp(6263531988747231, 289)); - EXPECT_EQ(ToDouble("3571.e263"), ldexp(6234526311072170, 833)); - EXPECT_EQ(ToDouble("81661.e153"), ldexp(6696636728760206, 472)); - EXPECT_EQ(ToDouble("920657.e-023"), ldexp(5975405561110124, -109)); - EXPECT_EQ(ToDouble("4603285.e-024"), ldexp(5975405561110124, -110)); - EXPECT_EQ(ToDouble("87575437.e-309"), ldexp(8452160731874668, -1053)); - EXPECT_EQ(ToDouble("245540327.e122"), ldexp(4985336549131723, 381)); - EXPECT_EQ(ToDouble("6138508175.e120"), ldexp(4985336549131723, 379)); - EXPECT_EQ(ToDouble("83356057653.e193"), ldexp(5986732817132056, 625)); - EXPECT_EQ(ToDouble("619534293513.e124"), ldexp(4798406992060657, 399)); - EXPECT_EQ(ToDouble("2335141086879.e218"), ldexp(5419088166961646, 713)); - EXPECT_EQ(ToDouble("36167929443327.e-159"), ldexp(8135819834632444, -536)); - EXPECT_EQ(ToDouble("609610927149051.e-255"), ldexp(4576664294594737, -850)); - EXPECT_EQ(ToDouble("3743626360493413.e-165"), ldexp(6898586531774201, -549)); - EXPECT_EQ(ToDouble("94080055902682397.e-242"), ldexp(6273271706052298, -800)); - EXPECT_EQ(ToDouble("899810892172646163.e283"), ldexp(7563892574477827, 947)); - EXPECT_EQ(ToDouble("7120190517612959703.e120"), ldexp(5385467232557565, 409)); - EXPECT_EQ(ToDouble("25188282901709339043.e-252"), - ldexp(5635662608542340, -825)); - EXPECT_EQ(ToDouble("308984926168550152811.e-052"), - ldexp(5644774693823803, -157)); - EXPECT_EQ(ToDouble("6372891218502368041059.e064"), - ldexp(4616868614322430, 233)); - - EXPECT_EQ(ToFloat("3.e-23"), ldexpf(9507380, -98)); - EXPECT_EQ(ToFloat("57.e18"), ldexpf(12960300, 42)); - EXPECT_EQ(ToFloat("789.e-35"), ldexpf(10739312, -130)); - EXPECT_EQ(ToFloat("2539.e-18"), ldexpf(11990089, -72)); - EXPECT_EQ(ToFloat("76173.e28"), ldexpf(9845130, 86)); - EXPECT_EQ(ToFloat("887745.e-11"), ldexpf(9760860, -40)); - EXPECT_EQ(ToFloat("5382571.e-37"), ldexpf(11447463, -124)); - EXPECT_EQ(ToFloat("82381273.e-35"), ldexpf(8554961, -113)); - EXPECT_EQ(ToFloat("750486563.e-38"), ldexpf(9975678, -120)); - EXPECT_EQ(ToFloat("3752432815.e-39"), ldexpf(9975678, -121)); - EXPECT_EQ(ToFloat("75224575729.e-45"), ldexpf(13105970, -137)); - EXPECT_EQ(ToFloat("459926601011.e15"), ldexpf(12466336, 65)); -} - -// Common test logic for converting a string which lies exactly halfway between -// two target floats. -// -// mantissa and exponent represent the precise value between two floating point -// numbers, `expected_low` and `expected_high`. The floating point -// representation to parse in `StrCat(mantissa, "e", exponent)`. -// -// This function checks that an input just slightly less than the exact value -// is rounded down to `expected_low`, and an input just slightly greater than -// the exact value is rounded up to `expected_high`. -// -// The exact value should round to `expected_half`, which must be either -// `expected_low` or `expected_high`. -template <typename FloatType> -void TestHalfwayValue(const std::string& mantissa, int exponent, - FloatType expected_low, FloatType expected_high, - FloatType expected_half) { - std::string low_rep = mantissa; - low_rep[low_rep.size() - 1] -= 1; - absl::StrAppend(&low_rep, std::string(1000, '9'), "e", exponent); - - FloatType actual_low = 0; - absl::from_chars(low_rep.data(), low_rep.data() + low_rep.size(), actual_low); - EXPECT_EQ(expected_low, actual_low); - - std::string high_rep = - absl::StrCat(mantissa, std::string(1000, '0'), "1e", exponent); - FloatType actual_high = 0; - absl::from_chars(high_rep.data(), high_rep.data() + high_rep.size(), - actual_high); - EXPECT_EQ(expected_high, actual_high); - - std::string halfway_rep = absl::StrCat(mantissa, "e", exponent); - FloatType actual_half = 0; - absl::from_chars(halfway_rep.data(), halfway_rep.data() + halfway_rep.size(), - actual_half); - EXPECT_EQ(expected_half, actual_half); -} - -TEST(FromChars, DoubleRounding) { - const double zero = 0.0; - const double first_subnormal = nextafter(zero, 1.0); - const double second_subnormal = nextafter(first_subnormal, 1.0); - - const double first_normal = DBL_MIN; - const double last_subnormal = nextafter(first_normal, 0.0); - const double second_normal = nextafter(first_normal, 1.0); - - const double last_normal = DBL_MAX; - const double penultimate_normal = nextafter(last_normal, 0.0); - - // Various test cases for numbers between two representable floats. Each - // call to TestHalfwayValue tests a number just below and just above the - // halfway point, as well as the number exactly between them. - - // Test between zero and first_subnormal. Round-to-even tie rounds down. - TestHalfwayValue( - "2." - "470328229206232720882843964341106861825299013071623822127928412503377536" - "351043759326499181808179961898982823477228588654633283551779698981993873" - "980053909390631503565951557022639229085839244910518443593180284993653615" - "250031937045767824921936562366986365848075700158576926990370631192827955" - "855133292783433840935197801553124659726357957462276646527282722005637400" - "648549997709659947045402082816622623785739345073633900796776193057750674" - "017632467360096895134053553745851666113422376667860416215968046191446729" - "184030053005753084904876539171138659164623952491262365388187963623937328" - "042389101867234849766823508986338858792562830275599565752445550725518931" - "369083625477918694866799496832404970582102851318545139621383772282614543" - "7693412532098591327667236328125", - -324, zero, first_subnormal, zero); - - // first_subnormal and second_subnormal. Round-to-even tie rounds up. - TestHalfwayValue( - "7." - "410984687618698162648531893023320585475897039214871466383785237510132609" - "053131277979497545424539885696948470431685765963899850655339096945981621" - "940161728171894510697854671067917687257517734731555330779540854980960845" - "750095811137303474765809687100959097544227100475730780971111893578483867" - "565399878350301522805593404659373979179073872386829939581848166016912201" - "945649993128979841136206248449867871357218035220901702390328579173252022" - "052897402080290685402160661237554998340267130003581248647904138574340187" - "552090159017259254714629617513415977493871857473787096164563890871811984" - "127167305601704549300470526959016576377688490826798697257336652176556794" - "107250876433756084600398490497214911746308553955635418864151316847843631" - "3080237596295773983001708984375", - -324, first_subnormal, second_subnormal, second_subnormal); - - // last_subnormal and first_normal. Round-to-even tie rounds up. - TestHalfwayValue( - "2." - "225073858507201136057409796709131975934819546351645648023426109724822222" - "021076945516529523908135087914149158913039621106870086438694594645527657" - "207407820621743379988141063267329253552286881372149012981122451451889849" - "057222307285255133155755015914397476397983411801999323962548289017107081" - "850690630666655994938275772572015763062690663332647565300009245888316433" - "037779791869612049497390377829704905051080609940730262937128958950003583" - "799967207254304360284078895771796150945516748243471030702609144621572289" - "880258182545180325707018860872113128079512233426288368622321503775666622" - "503982534335974568884423900265498198385487948292206894721689831099698365" - "846814022854243330660339850886445804001034933970427567186443383770486037" - "86162277173854562306587467901408672332763671875", - -308, last_subnormal, first_normal, first_normal); - - // first_normal and second_normal. Round-to-even tie rounds down. - TestHalfwayValue( - "2." - "225073858507201630123055637955676152503612414573018013083228724049586647" - "606759446192036794116886953213985520549032000903434781884412325572184367" - "563347617020518175998922941393629966742598285899994830148971433555578567" - "693279306015978183162142425067962460785295885199272493577688320732492479" - "924816869232247165964934329258783950102250973957579510571600738343645738" - "494324192997092179207389919761694314131497173265255020084997973676783743" - "155205818804439163810572367791175177756227497413804253387084478193655533" - "073867420834526162513029462022730109054820067654020201547112002028139700" - "141575259123440177362244273712468151750189745559978653234255886219611516" - "335924167958029604477064946470184777360934300451421683607013647479513962" - "13837722826145437693412532098591327667236328125", - -308, first_normal, second_normal, first_normal); - - // penultimate_normal and last_normal. Round-to-even rounds down. - TestHalfwayValue( - "1." - "797693134862315608353258760581052985162070023416521662616611746258695532" - "672923265745300992879465492467506314903358770175220871059269879629062776" - "047355692132901909191523941804762171253349609463563872612866401980290377" - "995141836029815117562837277714038305214839639239356331336428021390916694" - "57927874464075218944", - 308, penultimate_normal, last_normal, penultimate_normal); -} - -// Same test cases as DoubleRounding, now with new and improved Much Smaller -// Precision! -TEST(FromChars, FloatRounding) { - const float zero = 0.0; - const float first_subnormal = nextafterf(zero, 1.0); - const float second_subnormal = nextafterf(first_subnormal, 1.0); - - const float first_normal = FLT_MIN; - const float last_subnormal = nextafterf(first_normal, 0.0); - const float second_normal = nextafterf(first_normal, 1.0); - - const float last_normal = FLT_MAX; - const float penultimate_normal = nextafterf(last_normal, 0.0); - - // Test between zero and first_subnormal. Round-to-even tie rounds down. - TestHalfwayValue( - "7." - "006492321624085354618647916449580656401309709382578858785341419448955413" - "42930300743319094181060791015625", - -46, zero, first_subnormal, zero); - - // first_subnormal and second_subnormal. Round-to-even tie rounds up. - TestHalfwayValue( - "2." - "101947696487225606385594374934874196920392912814773657635602425834686624" - "028790902229957282543182373046875", - -45, first_subnormal, second_subnormal, second_subnormal); - - // last_subnormal and first_normal. Round-to-even tie rounds up. - TestHalfwayValue( - "1." - "175494280757364291727882991035766513322858992758990427682963118425003064" - "9651730385585324256680905818939208984375", - -38, last_subnormal, first_normal, first_normal); - - // first_normal and second_normal. Round-to-even tie rounds down. - TestHalfwayValue( - "1." - "175494420887210724209590083408724842314472120785184615334540294131831453" - "9442813071445925743319094181060791015625", - -38, first_normal, second_normal, first_normal); - - // penultimate_normal and last_normal. Round-to-even rounds down. - TestHalfwayValue("3.40282336497324057985868971510891282432", 38, - penultimate_normal, last_normal, penultimate_normal); -} - -TEST(FromChars, Underflow) { - // Check that underflow is handled correctly, according to the specification - // in DR 3081. - double d; - float f; - absl::from_chars_result result; - - std::string negative_underflow = "-1e-1000"; - const char* begin = negative_underflow.data(); - const char* end = begin + negative_underflow.size(); - d = 100.0; - result = absl::from_chars(begin, end, d); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_TRUE(std::signbit(d)); // negative - EXPECT_GE(d, -std::numeric_limits<double>::min()); - f = 100.0; - result = absl::from_chars(begin, end, f); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_TRUE(std::signbit(f)); // negative - EXPECT_GE(f, -std::numeric_limits<float>::min()); - - std::string positive_underflow = "1e-1000"; - begin = positive_underflow.data(); - end = begin + positive_underflow.size(); - d = -100.0; - result = absl::from_chars(begin, end, d); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_FALSE(std::signbit(d)); // positive - EXPECT_LE(d, std::numeric_limits<double>::min()); - f = -100.0; - result = absl::from_chars(begin, end, f); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_FALSE(std::signbit(f)); // positive - EXPECT_LE(f, std::numeric_limits<float>::min()); -} - -TEST(FromChars, Overflow) { - // Check that overflow is handled correctly, according to the specification - // in DR 3081. - double d; - float f; - absl::from_chars_result result; - - std::string negative_overflow = "-1e1000"; - const char* begin = negative_overflow.data(); - const char* end = begin + negative_overflow.size(); - d = 100.0; - result = absl::from_chars(begin, end, d); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_TRUE(std::signbit(d)); // negative - EXPECT_EQ(d, -std::numeric_limits<double>::max()); - f = 100.0; - result = absl::from_chars(begin, end, f); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_TRUE(std::signbit(f)); // negative - EXPECT_EQ(f, -std::numeric_limits<float>::max()); - - std::string positive_overflow = "1e1000"; - begin = positive_overflow.data(); - end = begin + positive_overflow.size(); - d = -100.0; - result = absl::from_chars(begin, end, d); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_FALSE(std::signbit(d)); // positive - EXPECT_EQ(d, std::numeric_limits<double>::max()); - f = -100.0; - result = absl::from_chars(begin, end, f); - EXPECT_EQ(result.ptr, end); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_FALSE(std::signbit(f)); // positive - EXPECT_EQ(f, std::numeric_limits<float>::max()); -} - -TEST(FromChars, RegressionTestsFromFuzzer) { - absl::string_view src = "0x21900000p00000000099"; - float f; - auto result = absl::from_chars(src.data(), src.data() + src.size(), f); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); -} - -TEST(FromChars, ReturnValuePtr) { - // Check that `ptr` points one past the number scanned, even if that number - // is not representable. - double d; - absl::from_chars_result result; - - std::string normal = "3.14@#$%@#$%"; - result = absl::from_chars(normal.data(), normal.data() + normal.size(), d); - EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(result.ptr - normal.data(), 4); - - std::string overflow = "1e1000@#$%@#$%"; - result = absl::from_chars(overflow.data(), - overflow.data() + overflow.size(), d); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_EQ(result.ptr - overflow.data(), 6); - - std::string garbage = "#$%@#$%"; - result = absl::from_chars(garbage.data(), - garbage.data() + garbage.size(), d); - EXPECT_EQ(result.ec, std::errc::invalid_argument); - EXPECT_EQ(result.ptr - garbage.data(), 0); -} - -// Check for a wide range of inputs that strtod() and absl::from_chars() exactly -// agree on the conversion amount. -// -// This test assumes the platform's strtod() uses perfect round_to_nearest -// rounding. -TEST(FromChars, TestVersusStrtod) { - for (int mantissa = 1000000; mantissa <= 9999999; mantissa += 501) { - for (int exponent = -300; exponent < 300; ++exponent) { - std::string candidate = absl::StrCat(mantissa, "e", exponent); - double strtod_value = strtod(candidate.c_str(), nullptr); - double absl_value = 0; - absl::from_chars(candidate.data(), candidate.data() + candidate.size(), - absl_value); - ASSERT_EQ(strtod_value, absl_value) << candidate; - } - } -} - -// Check for a wide range of inputs that strtof() and absl::from_chars() exactly -// agree on the conversion amount. -// -// This test assumes the platform's strtof() uses perfect round_to_nearest -// rounding. -TEST(FromChars, TestVersusStrtof) { - for (int mantissa = 1000000; mantissa <= 9999999; mantissa += 501) { - for (int exponent = -43; exponent < 32; ++exponent) { - std::string candidate = absl::StrCat(mantissa, "e", exponent); - float strtod_value = strtof(candidate.c_str(), nullptr); - float absl_value = 0; - absl::from_chars(candidate.data(), candidate.data() + candidate.size(), - absl_value); - ASSERT_EQ(strtod_value, absl_value) << candidate; - } - } -} - -// Tests if two floating point values have identical bit layouts. (EXPECT_EQ -// is not suitable for NaN testing, since NaNs are never equal.) -template <typename Float> -bool Identical(Float a, Float b) { - return 0 == memcmp(&a, &b, sizeof(Float)); -} - -// Check that NaNs are parsed correctly. The spec requires that -// std::from_chars on "NaN(123abc)" return the same value as std::nan("123abc"). -// How such an n-char-sequence affects the generated NaN is unspecified, so we -// just test for symmetry with std::nan and strtod here. -// -// (In Linux, this parses the value as a number and stuffs that number into the -// free bits of a quiet NaN.) -TEST(FromChars, NaNDoubles) { - for (std::string n_char_sequence : - {"", "1", "2", "3", "fff", "FFF", "200000", "400000", "4000000000000", - "8000000000000", "abc123", "legal_but_unexpected", - "99999999999999999999999", "_"}) { - std::string input = absl::StrCat("nan(", n_char_sequence, ")"); - SCOPED_TRACE(input); - double from_chars_double; - absl::from_chars(input.data(), input.data() + input.size(), - from_chars_double); - double std_nan_double = std::nan(n_char_sequence.c_str()); - EXPECT_TRUE(Identical(from_chars_double, std_nan_double)); - - // Also check that we match strtod()'s behavior. This test assumes that the - // platform has a compliant strtod(). -#if ABSL_STRTOD_HANDLES_NAN_CORRECTLY - double strtod_double = strtod(input.c_str(), nullptr); - EXPECT_TRUE(Identical(from_chars_double, strtod_double)); -#endif // ABSL_STRTOD_HANDLES_NAN_CORRECTLY - - // Check that we can parse a negative NaN - std::string negative_input = "-" + input; - double negative_from_chars_double; - absl::from_chars(negative_input.data(), - negative_input.data() + negative_input.size(), - negative_from_chars_double); - EXPECT_TRUE(std::signbit(negative_from_chars_double)); - EXPECT_FALSE(Identical(negative_from_chars_double, from_chars_double)); - from_chars_double = std::copysign(from_chars_double, -1.0); - EXPECT_TRUE(Identical(negative_from_chars_double, from_chars_double)); - } -} - -TEST(FromChars, NaNFloats) { - for (std::string n_char_sequence : - {"", "1", "2", "3", "fff", "FFF", "200000", "400000", "4000000000000", - "8000000000000", "abc123", "legal_but_unexpected", - "99999999999999999999999", "_"}) { - std::string input = absl::StrCat("nan(", n_char_sequence, ")"); - SCOPED_TRACE(input); - float from_chars_float; - absl::from_chars(input.data(), input.data() + input.size(), - from_chars_float); - float std_nan_float = std::nanf(n_char_sequence.c_str()); - EXPECT_TRUE(Identical(from_chars_float, std_nan_float)); - - // Also check that we match strtof()'s behavior. This test assumes that the - // platform has a compliant strtof(). -#if ABSL_STRTOD_HANDLES_NAN_CORRECTLY - float strtof_float = strtof(input.c_str(), nullptr); - EXPECT_TRUE(Identical(from_chars_float, strtof_float)); -#endif // ABSL_STRTOD_HANDLES_NAN_CORRECTLY - - // Check that we can parse a negative NaN - std::string negative_input = "-" + input; - float negative_from_chars_float; - absl::from_chars(negative_input.data(), - negative_input.data() + negative_input.size(), - negative_from_chars_float); - EXPECT_TRUE(std::signbit(negative_from_chars_float)); - EXPECT_FALSE(Identical(negative_from_chars_float, from_chars_float)); - from_chars_float = std::copysign(from_chars_float, -1.0); - EXPECT_TRUE(Identical(negative_from_chars_float, from_chars_float)); - } -} - -// Returns an integer larger than step. The values grow exponentially. -int NextStep(int step) { - return step + (step >> 2) + 1; -} - -// Test a conversion on a family of input strings, checking that the calculation -// is correct for in-bounds values, and that overflow and underflow are done -// correctly for out-of-bounds values. -// -// input_generator maps from an integer index to a string to test. -// expected_generator maps from an integer index to an expected Float value. -// from_chars conversion of input_generator(i) should result in -// expected_generator(i). -// -// lower_bound and upper_bound denote the smallest and largest values for which -// the conversion is expected to succeed. -template <typename Float> -void TestOverflowAndUnderflow( - const std::function<std::string(int)>& input_generator, - const std::function<Float(int)>& expected_generator, int lower_bound, - int upper_bound) { - // test legal values near lower_bound - int index, step; - for (index = lower_bound, step = 1; index < upper_bound; - index += step, step = NextStep(step)) { - std::string input = input_generator(index); - SCOPED_TRACE(input); - Float expected = expected_generator(index); - Float actual; - auto result = - absl::from_chars(input.data(), input.data() + input.size(), actual); - EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(expected, actual) - << absl::StrFormat("%a vs %a", expected, actual); - } - // test legal values near upper_bound - for (index = upper_bound, step = 1; index > lower_bound; - index -= step, step = NextStep(step)) { - std::string input = input_generator(index); - SCOPED_TRACE(input); - Float expected = expected_generator(index); - Float actual; - auto result = - absl::from_chars(input.data(), input.data() + input.size(), actual); - EXPECT_EQ(result.ec, std::errc()); - EXPECT_EQ(expected, actual) - << absl::StrFormat("%a vs %a", expected, actual); - } - // Test underflow values below lower_bound - for (index = lower_bound - 1, step = 1; index > -1000000; - index -= step, step = NextStep(step)) { - std::string input = input_generator(index); - SCOPED_TRACE(input); - Float actual; - auto result = - absl::from_chars(input.data(), input.data() + input.size(), actual); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_LT(actual, 1.0); // check for underflow - } - // Test overflow values above upper_bound - for (index = upper_bound + 1, step = 1; index < 1000000; - index += step, step = NextStep(step)) { - std::string input = input_generator(index); - SCOPED_TRACE(input); - Float actual; - auto result = - absl::from_chars(input.data(), input.data() + input.size(), actual); - EXPECT_EQ(result.ec, std::errc::result_out_of_range); - EXPECT_GT(actual, 1.0); // check for overflow - } -} - -// Check that overflow and underflow are caught correctly for hex doubles. -// -// The largest representable double is 0x1.fffffffffffffp+1023, and the -// smallest representable subnormal is 0x0.0000000000001p-1022, which equals -// 0x1p-1074. Therefore 1023 and -1074 are the limits of acceptable exponents -// in this test. -TEST(FromChars, HexdecimalDoubleLimits) { - auto input_gen = [](int index) { return absl::StrCat("0x1.0p", index); }; - auto expected_gen = [](int index) { return std::ldexp(1.0, index); }; - TestOverflowAndUnderflow<double>(input_gen, expected_gen, -1074, 1023); -} - -// Check that overflow and underflow are caught correctly for hex floats. -// -// The largest representable float is 0x1.fffffep+127, and the smallest -// representable subnormal is 0x0.000002p-126, which equals 0x1p-149. -// Therefore 127 and -149 are the limits of acceptable exponents in this test. -TEST(FromChars, HexdecimalFloatLimits) { - auto input_gen = [](int index) { return absl::StrCat("0x1.0p", index); }; - auto expected_gen = [](int index) { return std::ldexp(1.0f, index); }; - TestOverflowAndUnderflow<float>(input_gen, expected_gen, -149, 127); -} - -// Check that overflow and underflow are caught correctly for decimal doubles. -// -// The largest representable double is about 1.8e308, and the smallest -// representable subnormal is about 5e-324. '1e-324' therefore rounds away from -// the smallest representable positive value. -323 and 308 are the limits of -// acceptable exponents in this test. -TEST(FromChars, DecimalDoubleLimits) { - auto input_gen = [](int index) { return absl::StrCat("1.0e", index); }; - auto expected_gen = [](int index) { return Pow10(index); }; - TestOverflowAndUnderflow<double>(input_gen, expected_gen, -323, 308); -} - -// Check that overflow and underflow are caught correctly for decimal floats. -// -// The largest representable float is about 3.4e38, and the smallest -// representable subnormal is about 1.45e-45. '1e-45' therefore rounds towards -// the smallest representable positive value. -45 and 38 are the limits of -// acceptable exponents in this test. -TEST(FromChars, DecimalFloatLimits) { - auto input_gen = [](int index) { return absl::StrCat("1.0e", index); }; - auto expected_gen = [](int index) { return Pow10(index); }; - TestOverflowAndUnderflow<float>(input_gen, expected_gen, -45, 38); -} - -} // namespace |