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DwarfUnit: Make explicit a limitation/bug in enumeration constant emission.

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Filed as PR19712, LLVM fails to detect the right type of an enum
constant when a frontend does not provide an underlying type for the
enumeration type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-05-11 17:04:05 +00:00
parent 87f4cf7028
commit 42e3b31d69
1 changed files with 9 additions and 4 deletions
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13
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
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@ -748,12 +748,17 @@ void DwarfUnit::addBlockByrefAddress(const DbgVariable &DV, DIE &Die,
/// Return true if type encoding is unsigned.
static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
DIDerivedType DTy(Ty);
if (DTy.isDerivedType())
return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
if (DTy.isDerivedType()) {
if (DIType Deriv = DD->resolve(DTy.getTypeDerivedFrom()))
return isUnsignedDIType(DD, Deriv);
// FIXME: Enums without a fixed underlying type have unknown signedness
// here, leading to incorrectly emitted constants.
assert(DTy.getTag() == dwarf::DW_TAG_enumeration_type);
return false;
}
DIBasicType BTy(Ty);
if (!BTy.isBasicType())
return false;
assert(BTy.isBasicType());
unsigned Encoding = BTy.getEncoding();
assert(Encoding == dwarf::DW_ATE_unsigned ||
Encoding == dwarf::DW_ATE_unsigned_char ||