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Fix infinite recursion in MCAsmStreamer::EmitValueImpl.

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If a target can only emit 8-bits data, we would loop in EmitValueImpl
since it will try to split a 32-bits data in 1 chunk of 32-bits.

No test since all current targets can emit 32bits at a time.

Patch by Alexandru Guduleasa!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259399 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2016-02-01 20:36:49 +00:00
parent 59e213f5f1
commit 74894f721a
1 changed files with 5 additions and 7 deletions
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12
lib/MC/MCAsmStreamer.cpp
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@ -720,17 +720,15 @@ void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
report_fatal_error("Don't know how to emit this value.");
// We couldn't handle the requested integer size so we fallback by breaking
// the request down into several, smaller, integers. Since sizes greater
// than eight are invalid and size equivalent to eight should have been
// handled earlier, we use four bytes as our largest piece of granularity.
// the request down into several, smaller, integers.
// Since sizes greater or equal to "Size" are invalid, we use the greatest
// power of 2 that is less than "Size" as our largest piece of granularity.
bool IsLittleEndian = MAI->isLittleEndian();
for (unsigned Emitted = 0; Emitted != Size;) {
unsigned Remaining = Size - Emitted;
// The size of our partial emission must be a power of two less than
// eight.
unsigned EmissionSize = PowerOf2Floor(Remaining);
if (EmissionSize > 4)
EmissionSize = 4;
// Size.
unsigned EmissionSize = PowerOf2Floor(std::min(Remaining, Size - 1));
// Calculate the byte offset of our partial emission taking into account
// the endianness of the target.
unsigned ByteOffset =