This is a perf improvement of about 500ms for our razor code generation
benchmark on my dev box. That's about .8% of the overall execution time of
this benchmark.
This change will remove a bunch of unnessary allocations from the
parsing/code-generation path, and should improve responsiveness.
For reference Enum.HasFlags performs boxing of the enum value, and then
does a type comparison to see if the types are the same. This is
significantly more costly than a normal bitwise and comparison, and it
results in allocations.
These types are allocated for every state transition in the parser (State)
or every character that's read (character reference) and are fairly
compact. Turning them into structs will remove a significant number of unnecessary
allocations in the parser.
For our razor code generation benchmark, making these changes yields about
500-750ms of speedup (out of 40000ms) or about 1%.
- This registration system accepts tag descriptors that it then uses to feed requests for tag helpers.
- Added some infrastructure pieces that are used to build up valid tag helper descriptors.
#70
- These are the fixes to the tests that could not be fixed by altering the core parsing code base.
- Most involve adding TagBlock's, breaking out existing markup blocks and altering some AcceptedCharacter formats.
- Was able to loosen the restrictions on AcceptedCharacter's to allow the body of html tags to accept any character.
#75
GetSourceLocation is frequently called to determine the location mappings
between the original document and the generated code.
The old implementation did a number of ToString and replace operations to
simplify the math on tracking the position - which put it front and center
in our performance measurements - about 25% of all execution time in a
sampling profile of our perf test.
The new code tracks position as code is written, and avoids allocations.
After these changes GetSourceLocation doesn't show up in the profile.
This extensibility point needs to be an override and not a pure visitor due to how the class declaration is created (only 1 right way to write the class).
#76
The largest sub-segment change was removing the Microsoft.TestCommon project. Ultimately it involved touching every test file and re-mapping them to use Xunit directly instead of a helper class which was initially ported over for legacy reasons. Lastly how files were embedded before included the full path to the embedded file; currently there is no path associated with the embedded files so had to make modifications to account for this. This is a temporary change and I left comments in the locations where we'll need to uncomment out old code once embeded files act the same as they used to.
#18
David Fowler
Pranav K
Ryan Nowak
N. Taylor Mullen
Brice Lambson
Wei Wang
Eilon Lipton