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Bug 928738 - Safely pun double and float. r=jandem

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This commit is contained in:
Benjamin Peterson 2013-10-21 11:46:54 -04:00
parent 35558e8e7d
commit 12968871bd
1 changed files with 11 additions and 4 deletions
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15
js/src/jit/IonFrames.cpp
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@ -1249,6 +1249,11 @@ SnapshotIterator::slotReadable(const Slot &slot)
}
}
typedef union {
double d;
float f;
} PunDoubleFloat;
Value
SnapshotIterator::slotValue(const Slot &slot)
{
@ -1258,17 +1263,19 @@ SnapshotIterator::slotValue(const Slot &slot)
case SnapshotReader::FLOAT32_REG:
{
double asDouble = machine_.read(slot.floatReg());
PunDoubleFloat pdf;
pdf.d = machine_.read(slot.floatReg());
// The register contains the encoding of a float32. We just read
// the bits without making any conversion.
float asFloat = *(float*) &asDouble;
float asFloat = pdf.f;
return DoubleValue(asFloat);
}
case SnapshotReader::FLOAT32_STACK:
{
double asDouble = ReadFrameDoubleSlot(fp_, slot.stackSlot());
float asFloat = *(float*) &asDouble; // no conversion, see comment above.
PunDoubleFloat pdf;
pdf.d = ReadFrameDoubleSlot(fp_, slot.stackSlot());
float asFloat = pdf.f; // no conversion, see comment above.
return DoubleValue(asFloat);
}