src: refactor EndsInANumber in node_url.cc and adds IsIPv4NumberValid #46227
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Removes the use of vector in EndsInANumber and uses IsIPv4NumberValid instead of parsing the number to check if it is valid. Fixes: nodejs/performance#36 Refs: ada-url/ada#36
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hello everyone! |
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@miguelteixeiraa please use the following command: |
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Done! It hasn't changed that much : / |
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Yeah, it seems |
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Of course! |
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Done! |
anonrig
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Jan 16, 2023
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addaleax
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Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1293/ Results |
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Okay, windows problems.. not sure what it is but I'm checking |
anonrig
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Jan 17, 2023
src/node_url.cc
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| char delimiter = '.'; | ||
| auto pointer_start = input.begin(); |
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If you use std::string_view::iterator it might solve the issues related to std::string_view construct on windows.
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Windows build is still failing : /
D:\a\node\node\src\node_url.cc(465,66): error C2440: '<function-style-cast>': cannot convert from 'initializer list' to 'std::string_view' [D:\a\node\node\libnode.vcxproj]
D:\a\node\node\src\node_url.cc(465,66): message : No constructor could take the source type, or constructor overload resolution was ambiguous [D:\a\node\node\libnode.vcxproj]
node_util.cc
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I would like to know if I can go with &(*it); again
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it'd look like this:
std::string_view(&(*pointer_start), pointer_end - pointer_start));
just to make the build pass on windows
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What i understand is that iterators don't need to be pointers although they could be implemented as one. And some implementations of the STL (MSVC++, Mingw) implement interators with special classes (with no pre-difined casts to pointer), so that we cannot use them directly in the string_view constructor that we are using, which needs a charT*.
then we could use * which is overloaded to do what logically mean: convert the iterator type to its pointed-to object, then pass the address of this &(*it).
https://en.cppreference.com/w/cpp/named_req/RandomAccessIterator
https://stackoverflow.com/questions/32654108/c-stdvectoriterator-is-not-a-pointer-why/64910815#64910815
src/node_url.cc
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| return false; | ||
| return IsIPv4NumberValid( | ||
| std::string_view(&*pointer_start, pointer_end - pointer_start)); |
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This is too hacky (even if it's guaranteed safe).
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I'll try a static_cast<const char*>
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@nodejs/cpp-reviewers any recommendations?
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Yeah: I would definitely recommeng to go back to the original "hacky" implementation. It works and looks correct, even if it is not visually pretty. (I'd also not call this pointer if it's an iterator.) const_cast<char*>(pointer_start) doesn't even really make sense since the string_view constructor takes a const char* argument.
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Yes, I think it only works on the other compilers because their implementations for the iterator are:
std::string_view::iterator' (aka 'const char *')
(I purposely caused an error to catch this 'aka' haha)
anonrig
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Jan 17, 2023
anonrig
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anonrig
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Jan 20, 2023
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microbench: cpu: Apple M1 Pro runtime: node v20.0.0-pre (arm64-darwin) -- with this PR -- |
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Are you measuring production build against development build? |
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Thinking a little more, the microbench doesnt seem a good idea anymore. Sorry for that. Please just ignore (but yes, I guess I am) |
This was referenced Jan 21, 2023
addaleax
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Jan 23, 2023
jasnell
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Landed in 762a3a8 |
This was referenced Jan 24, 2023
ruyadorno
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Removes the use of vector in EndsInANumber and uses IsIPv4NumberValid instead of parsing the number to check if it is valid. Fixes: nodejs/performance#36 Refs: ada-url/ada#36 PR-URL: #46227 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>
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juanarbol
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Mar 3, 2023
Removes the use of vector in EndsInANumber and uses IsIPv4NumberValid instead of parsing the number to check if it is valid. Fixes: nodejs/performance#36 Refs: ada-url/ada#36 PR-URL: #46227 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>
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juanarbol
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Removes the use of vector in EndsInANumber and uses IsIPv4NumberValid instead of parsing the number to check if it is valid. Fixes: nodejs/performance#36 Refs: ada-url/ada#36 PR-URL: #46227 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>
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Removes the use of vector in EndsInANumber and uses IsIPv4NumberValid instead of parsing the number to check if it is valid.
Fixes: nodejs/performance#36
Refs: ada-url/ada#36