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[APFloat] Ensure that we can properly parse strings that do not have null terminators.

Browse Source 
rdar://14323230

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185397 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman 2013-07-01 23:54:08 +00:00
parent f801b8fe7a
commit b57770387a
2 changed files with 33 additions and 1 deletions
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9
lib/Support/APFloat.cpp
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@ -2481,7 +2481,14 @@ APFloat::convertFromDecimalString(StringRef str, roundingMode rounding_mode)
42039/12655 < L < 28738/8651 [ numerator <= 65536 ]
*/
if (decDigitValue(*D.firstSigDigit) >= 10U) {
// Test if we have a zero number allowing for strings with no null terminators
// and zero decimals with non-zero exponents.
//
// We computed firstSigDigit by ignoring all zeros and dots. Thus if
// D->firstSigDigit equals str.end(), every digit must be a zero and there can
// be at most one dot. On the other hand, if we have a zero with a non-zero
// exponent, then we know that D.firstSigDigit will be non-numeric.
if (decDigitValue(*D.firstSigDigit) >= 10U || D.firstSigDigit == str.end()) {
category = fcZero;
fs = opOK;

25
unittests/ADT/APFloatTest.cpp
View File

@ -538,6 +538,31 @@ TEST(APFloatTest, Zero) {
EXPECT_TRUE(APFloat(-0.0).isNegative());
}
TEST(APFloatTest, DecimalStringsWithoutNullTerminators) {
// Make sure that we can parse strings without null terminators.
// rdar://14323230.
APFloat Val(APFloat::IEEEdouble);
Val.convertFromString(StringRef("0.00", 3),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.0);
Val.convertFromString(StringRef("0.01", 3),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.0);
Val.convertFromString(StringRef("0.09", 3),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.0);
Val.convertFromString(StringRef("0.095", 4),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.09);
Val.convertFromString(StringRef("0.00e+3", 7),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.00);
Val.convertFromString(StringRef("0e+3", 4),
llvm::APFloat::rmNearestTiesToEven);
EXPECT_EQ(Val.convertToDouble(), 0.00);
}
TEST(APFloatTest, fromZeroDecimalString) {
EXPECT_EQ( 0.0, APFloat(APFloat::IEEEdouble, "0").convertToDouble());
EXPECT_EQ(+0.0, APFloat(APFloat::IEEEdouble, "+0").convertToDouble());