vabridgers added a subscriber: gamesh411.
vabridgers added a comment.
Adding more information, seems this patch's "hack" returns the following
QualType(T, 0).getDesugaredType(T->getDecl()->getASTContext()); ->
ConstantArrayType 0x11413090 'struct __va_list_tag[1]' imported 1
`-RecordType 0x11412ed0 'struct __va_list_tag' imported
`-Record 0x11412e38 '__va_list_tag'
The recent change from @mizvekov returns
T->desugar(); ->
ElaboratedType 0x11442870 '__builtin_va_list' sugar imported
`-TypedefType 0x11442840 '__builtin_va_list' sugar imported
|-Typedef 0x114130e8 '__builtin_va_list'
`-ConstantArrayType 0x11413090 'struct __va_list_tag[1]' imported 1
`-RecordType 0x11412ed0 'struct __va_list_tag' imported
`-Record 0x11412e38 '__va_list_tag'
And the code prior to @mizvekov code returns the following...
T->getDecl()->getASTContext().getTypeDeclType(*ToDeclOrErr); ->
TypedefType 0x11442bf0 'va_list' sugar
|-Typedef 0x113d4ad0 'va_list'
`-ElaboratedType 0x1136dbc0 '__builtin_va_list' sugar
`-TypedefType 0x1136db90 '__builtin_va_list' sugar
|-Typedef 0x1136db38 '__builtin_va_list'
`-ConstantArrayType 0x1136dae0 'struct __va_list_tag[1]' 1
`-RecordType 0x1136d920 'struct __va_list_tag'
`-Record 0x1136d898 '__va_list_tag'
Should import desugar types to a canonical underlying type free of syntactic
sugar? That's not clear to me at least. @gamesh411 pointed out in our debug
session that there are sections of code that iteratively strip sugar until
there's no more sugar left wrapping the type. But there's at least one instance
where only a single level of sugar is removed.
OTOH, I did find a section of code where va_list is not desugared - looks like
for diagnostic purposes - maybe this is a reason to use a solution following
@balazske's finding.
Any suggestions on how to proceed with this?
Thanks
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D136886/new/
https://reviews.llvm.org/D136886
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