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Add jvm backend check for UTF-8 Constant length #19622

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@hamzaremmal hamzaremmal commented Feb 5, 2024

Fix #15850

@hamzaremmal hamzaremmal requested a review from sjrd February 6, 2024 12:45
@sjrd sjrd self-assigned this Feb 6, 2024
@@ -148,6 +148,7 @@ class Compiler {
/** Generate the output of the compilation */
protected def backendPhases: List[List[Phase]] =
List(new backend.sjs.GenSJSIR) :: // Generate .sjsir files for Scala.js (not enabled by default)
List(new GenBCodeChecks) :: // Perform JVM specific checks
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That's an entire new mega phase for a couple checks. We don't want that. Either put the new miniphase in a previous group so that it can be fused with other miniphases, or integrate the checks directly into GenBCode.

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@hamzaremmal hamzaremmal Feb 6, 2024

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I agree, it's just that we don't have mini phases in the backend. I've moved it to the end of the transform phases (just before the backend).

@hamzaremmal hamzaremmal force-pushed the i15850 branch 2 times, most recently from e5274b1 to 259eddf Compare February 6, 2024 22:42
Comment on lines +34 to +35
val UTF8_MAX_LENGTH = 65535
if str.length > UTF8_MAX_LENGTH then
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Huh, so this is not precise enough. It will work for ASCII strings without null characters, but not for all strings. The referenced spec says that the u2 length field is the number of bytes of the encoded string. But null chars and non-ASCII chars take more than 1 byte (up to 6!).

We should simulate the encoding and count the number of bytes actually taken. As a fast-path, we should succeed early if str.length <= (UTF8_MAX_LENGTH / 6), since that is going the overwhelmingly common case.

import core.Symbols.*
import util.SrcPos

final class CheckJVMSpecification extends MiniPhase:
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Consider an end CheckJVMSpecification marker for this class. It spans more than one screen.

override def transformDefDef(tree: DefDef)(using Context): Tree =
val sym = tree.symbol
val memberTpe = atPhase(ctx.base.erasurePhase) { sym.owner.denot.thisType.memberInfo(sym) }
for sig <- GenericSignatures.javaSig(sym, memberTpe) do
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Does this mean we'll compute the Java generic signature twice for every DefDef? Once here and once in the actual back-end? That's not great; it's a somewhat expensive operation.

@sjrd sjrd removed their assignment Feb 27, 2024
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som-snytt commented Jun 7, 2024

On scala 2, I'll try intercepting the error and only then doing a post-mortem.

I wonder if other error messaging would benefit from doing no analysis except after the fact; or maybe "interactive mode" drags apparatus along, which is turned off in batch mode.

Edit: scala/scala#10791

|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|Method signature length exceed the maximum length allowed by the JVM specification.
|Allowed: 65535
|Actual : 496979
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it's an awesome error.

@@ -0,0 +1 @@
val x = 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works better programmatically so we can see what is being tested, but I appreciate that it is reminiscent of "endless screaming" https://fosstodon.org/@[email protected]

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"UTF8 string too large" in GenBCode
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