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10821 :: Why Nim allowing asm stmt at js ?

• ASVI (orginal) [2023-12-31T19:14:11+01:00] view original

  The use of asm instead of emit can be seen for example in nim hashes. If it is supported for historical reasons, then we should make that use obsolete.

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• juancarlospaco (orginal) [2023-12-31T19:45:49+01:00] view original

  They are different, emit may or may not produce a code like:

  
  var result = null;
  
  /* YOUR CODE HERE */
  
  return result;
  
  Run

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• ASVI (orginal) [2023-12-31T20:52:44+01:00] view original

  It produces same code for asm stmt and emit. And there shouldn't be any differences because in genAsmOrEmitStmt logic for emit and asm is same (no differences at all) see https://github.com/nim-lang/Nim/blob/devel/compiler/jsgen.nim#L1139

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• Araq (orginal) [2024-01-01T09:12:54+01:00] view original

  It is used for historical reasons, yes, back then we didn't have .emit IIRC. But I'm not sure if we should deprecate it, what's the problem with it?

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• ASVI (orginal) [2024-01-01T13:17:58+01:00] view original

  We already have an emit that does the same thing

  The name asm itself is a bit confusing, you might think it's an alias for asm.js or something else.

  The asm keyword is used differently on different compiler targets.

  Does anyone (other than some compiler libraries) use asm instead of emit ? If yes, it's a bit strange to use asm somewhere and emit somewhere. By making the asm keyword for js target deprecated, there would be even less use of the asm keyword for js target, reducing the amount of confusion.

  New users might accidentally use a non-universal approach via the asm keyword instead of emit, and then when they learn about asm, try to figure out what the differences are.

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• rel (orginal) [2024-01-02T09:09:11+01:00] view original

  The situation seems to be like "no difference between {.importcpp.} and {.importjs.}" for Js backend. https://forum.nim-lang.org/t/9922

  If "{.importcpp.} == {.importjs.}" in js compiler it is confusing why eg. in "dom.nim" both pragmas are used.

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