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Add Record::getValueAsOptionalDef().

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Using `?` as an optional marker is very useful in Clang's AST-node
emitters because otherwise we need a separate class just to encode
the presence or absence of a base node reference.
This commit is contained in:
John McCall 2019-10-25 16:23:17 -07:00
parent 6fbcb75321
commit f5df3740fd
2 changed files with 21 additions and 0 deletions
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6
include/llvm/TableGen/Record.h
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@ -1663,6 +1663,12 @@ public:
/// the value is not the right type.
Record *getValueAsDef(StringRef FieldName) const;
/// This method looks up the specified field and returns its value as a
/// Record, returning null if the field exists but is "uninitialized"
/// (i.e. set to `?`), and throwing an exception if the field does not
/// exist or if its value is not the right type.
Record *getValueAsOptionalDef(StringRef FieldName) const;
/// This method looks up the specified field and returns its
/// value as a bit, throwing an exception if the field does not exist or if
/// the value is not the right type.

15
lib/TableGen/Record.cpp
View File

@ -2277,6 +2277,21 @@ Record *Record::getValueAsDef(StringRef FieldName) const {
FieldName + "' does not have a def initializer!");
}
Record *Record::getValueAsOptionalDef(StringRef FieldName) const {
const RecordVal *R = getValue(FieldName);
if (!R || !R->getValue())
PrintFatalError(getLoc(), "Record `" + getName() +
"' does not have a field named `" + FieldName + "'!\n");
if (DefInit *DI = dyn_cast<DefInit>(R->getValue()))
return DI->getDef();
if (isa<UnsetInit>(R->getValue()))
return nullptr;
PrintFatalError(getLoc(), "Record `" + getName() + "', field `" +
FieldName + "' does not have either a def initializer or '?'!");
}
bool Record::getValueAsBit(StringRef FieldName) const {
const RecordVal *R = getValue(FieldName);
if (!R || !R->getValue())