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Edit File: test-bignum-dtoa.cc
// Copyright 2011 the V8 project authors. 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. #include <stdlib.h> #include "v8.h" #include "bignum-dtoa.h" #include "cctest.h" #include "double.h" #include "gay-fixed.h" #include "gay-precision.h" #include "gay-shortest.h" #include "platform.h" using namespace v8::internal; // Removes trailing '0' digits. // Can return the empty string if all digits are 0. static void TrimRepresentation(Vector<char> representation) { int len = StrLength(representation.start()); int i; for (i = len - 1; i >= 0; --i) { if (representation[i] != '0') break; } representation[i + 1] = '\0'; } static const int kBufferSize = 100; TEST(BignumDtoaVariousDoubles) { char buffer_container[kBufferSize]; Vector<char> buffer(buffer_container, kBufferSize); int length; int point; BignumDtoa(1.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("1", buffer.start()); CHECK_EQ(1, point); BignumDtoa(1.0, BIGNUM_DTOA_FIXED, 3, buffer, &length, &point); CHECK_GE(3, length - point); TrimRepresentation(buffer); CHECK_EQ("1", buffer.start()); CHECK_EQ(1, point); BignumDtoa(1.0, BIGNUM_DTOA_PRECISION, 3, buffer, &length, &point); CHECK_GE(3, length); TrimRepresentation(buffer); CHECK_EQ("1", buffer.start()); CHECK_EQ(1, point); BignumDtoa(1.5, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("15", buffer.start()); CHECK_EQ(1, point); BignumDtoa(1.5, BIGNUM_DTOA_FIXED, 10, buffer, &length, &point); CHECK_GE(10, length - point); TrimRepresentation(buffer); CHECK_EQ("15", buffer.start()); CHECK_EQ(1, point); BignumDtoa(1.5, BIGNUM_DTOA_PRECISION, 10, buffer, &length, &point); CHECK_GE(10, length); TrimRepresentation(buffer); CHECK_EQ("15", buffer.start()); CHECK_EQ(1, point); double min_double = 5e-324; BignumDtoa(min_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("5", buffer.start()); CHECK_EQ(-323, point); BignumDtoa(min_double, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); CHECK_GE(5, length - point); TrimRepresentation(buffer); CHECK_EQ("", buffer.start()); BignumDtoa(min_double, BIGNUM_DTOA_PRECISION, 5, buffer, &length, &point); CHECK_GE(5, length); TrimRepresentation(buffer); CHECK_EQ("49407", buffer.start()); CHECK_EQ(-323, point); double max_double = 1.7976931348623157e308; BignumDtoa(max_double, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("17976931348623157", buffer.start()); CHECK_EQ(309, point); BignumDtoa(max_double, BIGNUM_DTOA_PRECISION, 7, buffer, &length, &point); CHECK_GE(7, length); TrimRepresentation(buffer); CHECK_EQ("1797693", buffer.start()); CHECK_EQ(309, point); BignumDtoa(4294967272.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("4294967272", buffer.start()); CHECK_EQ(10, point); BignumDtoa(4294967272.0, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); CHECK_EQ("429496727200000", buffer.start()); CHECK_EQ(10, point); BignumDtoa(4294967272.0, BIGNUM_DTOA_PRECISION, 14, buffer, &length, &point); CHECK_GE(14, length); TrimRepresentation(buffer); CHECK_EQ("4294967272", buffer.start()); CHECK_EQ(10, point); BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("4185580496821357", buffer.start()); CHECK_EQ(299, point); BignumDtoa(4.1855804968213567e298, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point); CHECK_GE(20, length); TrimRepresentation(buffer); CHECK_EQ("41855804968213567225", buffer.start()); CHECK_EQ(299, point); BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("5562684646268003", buffer.start()); CHECK_EQ(-308, point); BignumDtoa(5.5626846462680035e-309, BIGNUM_DTOA_PRECISION, 1, buffer, &length, &point); CHECK_GE(1, length); TrimRepresentation(buffer); CHECK_EQ("6", buffer.start()); CHECK_EQ(-308, point); BignumDtoa(2147483648.0, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("2147483648", buffer.start()); CHECK_EQ(10, point); BignumDtoa(2147483648.0, BIGNUM_DTOA_FIXED, 2, buffer, &length, &point); CHECK_GE(2, length - point); TrimRepresentation(buffer); CHECK_EQ("2147483648", buffer.start()); CHECK_EQ(10, point); BignumDtoa(2147483648.0, BIGNUM_DTOA_PRECISION, 5, buffer, &length, &point); CHECK_GE(5, length); TrimRepresentation(buffer); CHECK_EQ("21475", buffer.start()); CHECK_EQ(10, point); BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("35844466002796428", buffer.start()); CHECK_EQ(299, point); BignumDtoa(3.5844466002796428e+298, BIGNUM_DTOA_PRECISION, 10, buffer, &length, &point); CHECK_GE(10, length); TrimRepresentation(buffer); CHECK_EQ("35844466", buffer.start()); CHECK_EQ(299, point); uint64_t smallest_normal64 = V8_2PART_UINT64_C(0x00100000, 00000000); double v = Double(smallest_normal64).value(); BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("22250738585072014", buffer.start()); CHECK_EQ(-307, point); BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point); CHECK_GE(20, length); TrimRepresentation(buffer); CHECK_EQ("22250738585072013831", buffer.start()); CHECK_EQ(-307, point); uint64_t largest_denormal64 = V8_2PART_UINT64_C(0x000FFFFF, FFFFFFFF); v = Double(largest_denormal64).value(); BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("2225073858507201", buffer.start()); CHECK_EQ(-307, point); BignumDtoa(v, BIGNUM_DTOA_PRECISION, 20, buffer, &length, &point); CHECK_GE(20, length); TrimRepresentation(buffer); CHECK_EQ("2225073858507200889", buffer.start()); CHECK_EQ(-307, point); BignumDtoa(4128420500802942e-24, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("4128420500802942", buffer.start()); CHECK_EQ(-8, point); v = 3.9292015898194142585311918e-10; BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ("39292015898194143", buffer.start()); v = 4194304.0; BignumDtoa(v, BIGNUM_DTOA_FIXED, 5, buffer, &length, &point); CHECK_GE(5, length - point); TrimRepresentation(buffer); CHECK_EQ("4194304", buffer.start()); v = 3.3161339052167390562200598e-237; BignumDtoa(v, BIGNUM_DTOA_PRECISION, 19, buffer, &length, &point); CHECK_GE(19, length); TrimRepresentation(buffer); CHECK_EQ("3316133905216739056", buffer.start()); CHECK_EQ(-236, point); v = 7.9885183916008099497815232e+191; BignumDtoa(v, BIGNUM_DTOA_PRECISION, 4, buffer, &length, &point); CHECK_GE(4, length); TrimRepresentation(buffer); CHECK_EQ("7989", buffer.start()); CHECK_EQ(192, point); v = 1.0000000000000012800000000e+17; BignumDtoa(v, BIGNUM_DTOA_FIXED, 1, buffer, &length, &point); CHECK_GE(1, length - point); TrimRepresentation(buffer); CHECK_EQ("100000000000000128", buffer.start()); CHECK_EQ(18, point); } TEST(BignumDtoaGayShortest) { char buffer_container[kBufferSize]; Vector<char> buffer(buffer_container, kBufferSize); int length; int point; Vector<const PrecomputedShortest> precomputed = PrecomputedShortestRepresentations(); for (int i = 0; i < precomputed.length(); ++i) { const PrecomputedShortest current_test = precomputed[i]; double v = current_test.v; BignumDtoa(v, BIGNUM_DTOA_SHORTEST, 0, buffer, &length, &point); CHECK_EQ(current_test.decimal_point, point); CHECK_EQ(current_test.representation, buffer.start()); } } TEST(BignumDtoaGayFixed) { char buffer_container[kBufferSize]; Vector<char> buffer(buffer_container, kBufferSize); int length; int point; Vector<const PrecomputedFixed> precomputed = PrecomputedFixedRepresentations(); for (int i = 0; i < precomputed.length(); ++i) { const PrecomputedFixed current_test = precomputed[i]; double v = current_test.v; int number_digits = current_test.number_digits; BignumDtoa(v, BIGNUM_DTOA_FIXED, number_digits, buffer, &length, &point); CHECK_EQ(current_test.decimal_point, point); CHECK_GE(number_digits, length - point); TrimRepresentation(buffer); CHECK_EQ(current_test.representation, buffer.start()); } } TEST(BignumDtoaGayPrecision) { char buffer_container[kBufferSize]; Vector<char> buffer(buffer_container, kBufferSize); int length; int point; Vector<const PrecomputedPrecision> precomputed = PrecomputedPrecisionRepresentations(); for (int i = 0; i < precomputed.length(); ++i) { const PrecomputedPrecision current_test = precomputed[i]; double v = current_test.v; int number_digits = current_test.number_digits; BignumDtoa(v, BIGNUM_DTOA_PRECISION, number_digits, buffer, &length, &point); CHECK_EQ(current_test.decimal_point, point); CHECK_GE(number_digits, length); TrimRepresentation(buffer); CHECK_EQ(current_test.representation, buffer.start()); } }