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Fix undefined behavior (signed integer overflow) when Clang parses a hexfloat with an enormous exponent. Caught by an existing unit test + -ftrapv. 

llvm-svn: 162505
This commit is contained in:
Richard Smith 2012-08-24 00:01:19 +00:00
parent 281d7998b8
commit 156d92037a
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Support/APFloat.cpp
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@ -196,8 +196,10 @@ totalExponent(StringRef::iterator p, StringRef::iterator end,
assert(value < 10U && "Invalid character in exponent");
unsignedExponent = unsignedExponent * 10 + value;
if (unsignedExponent > 32767)
if (unsignedExponent > 32767) {
overflow = true;
break;
}
}
if (exponentAdjustment > 32767 || exponentAdjustment < -32768)