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Fix left shifts by too large exponents in MCParser

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(which happened only on error recovery path).

This bug was reported by UBSan.

llvm-svn: 216915
This commit is contained in:
Alexey Samsonov 2014-09-02 17:25:29 +00:00
parent ef361be676
commit 18719dd2bd
1 changed files with 8 additions and 7 deletions
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15
lib/MC/MCParser/AsmParser.cpp
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@ -2601,13 +2601,14 @@ bool AsmParser::parseDirectiveFill() {
if (!isUInt<32>(FillExpr) && FillSize > 4)
Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
int64_t NonZeroFillSize = FillSize > 4 ? 4 : FillSize;
FillExpr &= ~0ULL >> (64 - NonZeroFillSize * 8);
for (uint64_t i = 0, e = NumValues; i != e; ++i) {
getStreamer().EmitIntValue(FillExpr, NonZeroFillSize);
if (NonZeroFillSize < FillSize)
getStreamer().EmitIntValue(0, FillSize - NonZeroFillSize);
if (NumValues > 0) {
int64_t NonZeroFillSize = FillSize > 4 ? 4 : FillSize;
FillExpr &= ~0ULL >> (64 - NonZeroFillSize * 8);
for (uint64_t i = 0, e = NumValues; i != e; ++i) {
getStreamer().EmitIntValue(FillExpr, NonZeroFillSize);
if (NonZeroFillSize < FillSize)
getStreamer().EmitIntValue(0, FillSize - NonZeroFillSize);
}
}
return false;