blob: b775c247f756efd513e8bbd502ba5b6df7684df9 [file] [log] [blame]
//===-- Unittests for strtod ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/__support/FPUtil/FPBits.h"
#include "src/errno/libc_errno.h"
#include "src/stdlib/strtod.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/RoundingModeUtils.h"
#include "test/UnitTest/Test.h"
#include <limits.h>
#include <stddef.h>
using __llvm_libc::fputil::testing::ForceRoundingModeTest;
using __llvm_libc::fputil::testing::RoundingMode;
using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
class LlvmLibcStrToDTest : public __llvm_libc::testing::Test,
ForceRoundingModeTest<RoundingMode::Nearest> {
public:
void run_test(const char *inputString, const ptrdiff_t expectedStrLen,
const uint64_t expectedRawData, const int expectedErrno = 0) {
// expectedRawData is the expected double result as a uint64_t, organized
// according to IEEE754:
//
// +-- 1 Sign Bit +-- 52 Mantissa bits
// | |
// | +-------------------------+------------------------+
// | | |
// SEEEEEEEEEEEMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
// | |
// +----+----+
// |
// +-- 11 Exponent Bits
//
// This is so that the result can be compared in parts.
char *str_end = nullptr;
__llvm_libc::fputil::FPBits<double> expected_fp =
__llvm_libc::fputil::FPBits<double>(expectedRawData);
libc_errno = 0;
double result = __llvm_libc::strtod(inputString, &str_end);
if (expectedErrno == 0)
EXPECT_THAT(result, Succeeds<double>(static_cast<double>(expected_fp)));
else
EXPECT_THAT(result, Fails<double>(expectedErrno,
static_cast<double>(expected_fp)));
EXPECT_EQ(str_end - inputString, expectedStrLen);
}
};
TEST_F(LlvmLibcStrToDTest, SimpleTest) {
run_test("123", 3, uint64_t(0x405ec00000000000));
// This should fail on Eisel-Lemire, forcing a fallback to simple decimal
// conversion.
run_test("12345678901234549760", 20, uint64_t(0x43e56a95319d63d8));
// Found while looking for difficult test cases here:
// https://github.com/nigeltao/parse-number-fxx-test-data/blob/main/more-test-cases/golang-org-issue-36657.txt
run_test("1090544144181609348835077142190", 31, uint64_t(0x462b8779f2474dfb));
run_test("0x123", 5, uint64_t(0x4072300000000000));
}
// These are tests that have caused problems in the past.
TEST_F(LlvmLibcStrToDTest, SpecificFailures) {
run_test("3E70000000000000", 16, uint64_t(0x7FF0000000000000), ERANGE);
run_test("358416272e-33", 13, uint64_t(0x3adbbb2a68c9d0b9));
run_test("2.16656806400000023841857910156251e9", 36,
uint64_t(0x41e0246690000001));
run_test("27949676547093071875", 20, uint64_t(0x43f83e132bc608c9));
run_test(
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"000000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000e-800",
806, 0x3ff0000000000000);
run_test(
"100000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000e-799",
806, 0x4024000000000000);
run_test(
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"0000000000e-800",
807, 0x4024000000000000);
run_test(
"10000000000000000000000000000000000000000000000000000000000000000e-64",
69, 0x3ff0000000000000);
run_test(
"100000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000e-128",
134, 0x3ff0000000000000);
run_test("1000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000000000000000e-256",
262, 0x3ff0000000000000);
run_test("1000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"0000000000000000000000000000000000000000000000000000000000000000000"
"00000000000000000000000000000000000000000000e-512",
518, 0x3ff0000000000000);
run_test(
"100000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"00000000000000000e-1024",
1031, 0x3ff0000000000000);
run_test(
"0"
"100000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"00000000000000000e-1024",
1032, 0x3ff0000000000000);
}
TEST_F(LlvmLibcStrToDTest, FuzzFailures) {
run_test("-\xff\xff\xff\xff\xff\xff\xff\x01", 0, uint64_t(0));
run_test("-.????", 0, uint64_t(0));
run_test(
"44444444444444444444444444444444444444444444444444A44444444444444444"
"44444444444*\x99\xff\xff\xff\xff",
50, uint64_t(0x4a3e68fdd0e0b2d8));
run_test("-NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNKNNNNNNNNNNNNNNNNNN?"
"NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN?",
0, uint64_t(0));
run_test("0x.666E40", 9, uint64_t(0x3fd99b9000000000));
// glibc version 2.36 and higher (not tested with lower versions) disagrees
// with this result, but ours is correct for the nearest rounding mode. See
// this bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30220
run_test("0x30000002222225p-1077", 22, uint64_t(0x0006000000444445), ERANGE);
// This value triggered a bug by having an exponent exactly equal to the
// maximum. The overflow checks would accept a value less than the max value
// as valid and greater than the max value as invalid (and set it to the max),
// but an exponent of exactly max value hit the else condition which is
// intended for underflow and set the exponent to the min exponent.
run_test(
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"000000000171946000000000000000000700460000000000000000000000001000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000020000000000000000"
"000000000000563168371187884238877744600000000000000000000000000000523858"
"112470171946000000000000000001719460000000000000000007004600000000000000"
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"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000005238581124701719460000000"
"000000000017194600000000000000000070046000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"200000000000000000E608",
1462, uint64_t(0x7ff0000000000000), ERANGE);
// Same as above but for hex.
run_test("0x0164810157p2047", 17, uint64_t(0x7ff0000000000000), ERANGE);
// This test ensures that only the correct number of characters is accepted.
// An exponent symbol followed by a sign isn't a valid exponent.
run_test("2e+", 1, uint64_t(0x4000000000000000));
run_test("0x2p+", 3, uint64_t(0x4000000000000000));
// This bug was in the handling of very large exponents in the exponent
// marker. Previously anything greater than 10,000 would be set to 10,000.
// This caused incorrect behavior if there were more than 10,000 '0's in the
// input number, and then a correspondingly large exponent. This test case has
// 24,744 zeroes.
run_test(
"0x."
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24755, uint64_t(0x7ff0000000000000), ERANGE);
}