[llvm-dev] TableGen !find operator
Paul C. Anagnostopoulos via llvm-dev
llvm-dev at lists.llvm.org
Fri Apr 23 11:01:56 PDT 2021
I've implemented the !find operator for TableGen.
!find(source_string, target_string [, start-pos])
It returns the position of the target_string in the source_string. The
question is: What should it return if the there is no match?
std::string::find() returns npos, which is ~size_t
<https://llvm.org/doxygen/classsize__t.html>(0). TableGen's integers are
signed. So it could return -1, or it could return the maximum positive
signed integer. Or, it could break with tradition and return the length
of the source_string. The easiest thing to test for is -1.
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