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Warnings.scala
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Warnings.scala
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/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala.tools
package nsc
package settings
import scala.tools.nsc.Reporting.WarningCategory
/** Settings influencing the printing of warnings.
*/
trait Warnings {
self: MutableSettings =>
val Whelp = BooleanSetting("-W", "Print a synopsis of warning options.")
// Warning semantics.
val fatalWarnings = BooleanSetting("-Werror", "Fail the compilation if there are any warnings.") withAbbreviation "-Xfatal-warnings"
private val WconfDefault = List("cat=deprecation:ws", "cat=feature:ws", "cat=optimizer:ws")
// Note: user-defined settings are added on the right, but the value is reversed before
// it's parsed, so that later defined settings take precedence.
val Wconf = MultiStringSetting(
"-Wconf",
"patterns",
"Configure reporting of compiler warnings; use `help` for details.",
helpText = Some(
s"""Configure compiler warnings.
|Syntax: -Wconf:<filters>:<action>,<filters>:<action>,...
|multiple <filters> are combined with &, i.e., <filter>&...&<filter>
|
|Note: Run with `-Wconf:any:warning-verbose` to print warnings with their category, site,
|and (for deprecations) origin and since-version.
|
|<filter>
| - Any message: any
|
| - Message categories: cat=deprecation, cat=lint, cat=lint-infer-any
| The full list of warning categories is shown at the end of this help text.
|
| - Message content: msg=regex
| The regex need only match some part of the message, not all of it.
|
| - Site where the warning is triggered: site=my\\.package\\..*
| The regex must match the full name (`package.Class.method`) of the warning position.
|
| - Source file name: src=src_managed/.*
| If `-rootdir` is specified, the regex must match the canonical path relative to the
| root directory. Otherwise, the regex must match the canonical path relative to any
| path segment (`b/.*Test.scala` matches `/a/b/XTest.scala` but not `/ab/Test.scala`).
| Use unix-style paths, separated by `/`.
|
| - Origin of deprecation: origin=external\\.package\\..*
| The regex must match the full name (`package.Class.method`) of the deprecated entity.
|
| - Since of deprecation: since<1.24
| Valid operators: <, =, >, valid versions: N, N.M, N.M.P. Compares against the first
| version of the form N, N.M or N.M.P found in the `since` parameter of the deprecation,
| for example `1.2.3` in `@deprecated("", "some lib 1.2.3-foo")`.
|
|<action>
| - error / e
| - warning / w
| - warning-summary / ws (summary with the number of warnings, like for deprecations)
| - warning-verbose / wv (show warning category and site)
| - info / i (infos are not counted as warnings and don't affect `-Werror`)
| - info-summary / is
| - info-verbose / iv
| - silent / s
|
|The default configuration is:
| -Wconf:${WconfDefault.mkString(",")}
|
|User-defined configurations are added to the left. The leftmost rule matching
|a warning message defines the action.
|
|Examples:
| - change every warning into an error: -Wconf:any:error
| - silence certain deprecations: -Wconf:origin=some\\.lib\\..*&since>2.2:s
|
|Full list of message categories:
|${WarningCategory.builtIn.keys.groupBy(_.split('-').head).toList.sortBy(_._1).map(_._2.toList.sorted.mkString(", ")).mkString(" - ", "\n - ", "")}
|
|To suppress warnings locally, use the `scala.annotation.nowarn` annotation.
|
|Note: on the command-line you might need to quote configurations containing `*` or `&`
|to prevent the shell from expanding patterns.""".stripMargin),
prepend = true)
locally { Wconf.tryToSet(WconfDefault); Wconf.clearSetByUser() }
// Non-lint warnings. -- TODO turn into MultiChoiceEnumeration
val warnMacros = ChoiceSetting(
name = "-Wmacros",
helpArg = "mode",
descr = "Enable lint warnings on macro expansions.",
choices = List("none", "before", "after", "both"),
default = "before",
choicesHelp = List(
"Do not inspect expansions or their original trees when generating unused symbol warnings.",
"Only inspect unexpanded user-written code for unused symbols.",
"Only inspect expanded trees when generating unused symbol warnings.",
"Inspect both user-written code and expanded trees when generating unused symbol warnings."
)
) withAbbreviation "-Ywarn-macros"
val warnDeadCode = BooleanSetting("-Wdead-code", "Warn when dead code is identified.") withAbbreviation "-Ywarn-dead-code"
val warnValueDiscard = BooleanSetting("-Wvalue-discard", "Warn when non-Unit expression results are unused.") withAbbreviation "-Ywarn-value-discard"
val warnNumericWiden = BooleanSetting("-Wnumeric-widen", "Warn when numerics are widened.") withAbbreviation "-Ywarn-numeric-widen"
val warnOctalLiteral = BooleanSetting("-Woctal-literal", "Warn on obsolete octal syntax.") withAbbreviation "-Ywarn-octal-literal"
object UnusedWarnings extends MultiChoiceEnumeration {
val Imports = Choice("imports", "Warn if an import selector is not referenced.")
val PatVars = Choice("patvars", "Warn if a variable bound in a pattern is unused.")
val Privates = Choice("privates", "Warn if a private member is unused.")
val Locals = Choice("locals", "Warn if a local definition is unused.")
val Explicits = Choice("explicits", "Warn if an explicit parameter is unused.")
val Implicits = Choice("implicits", "Warn if an implicit parameter is unused.")
val Nowarn = Choice("nowarn", "Warn if a @nowarn annotation does not suppress any warnings.")
val Params = Choice("params", "Enable -Wunused:explicits,implicits.", expandsTo = List(Explicits, Implicits))
val Linted = Choice("linted", "-Xlint:unused.", expandsTo = List(Imports, Privates, Locals, Implicits, Nowarn))
}
// The -Ywarn-unused warning group.
val warnUnused = MultiChoiceSetting(
name = "-Wunused",
helpArg = "warning",
descr = "Enable or disable specific `unused` warnings",
domain = UnusedWarnings,
default = Some(List("_"))
) withAbbreviation "-Ywarn-unused"
def warnUnusedImport = warnUnused contains UnusedWarnings.Imports
def warnUnusedPatVars = warnUnused contains UnusedWarnings.PatVars
def warnUnusedPrivates = warnUnused contains UnusedWarnings.Privates
def warnUnusedLocals = warnUnused contains UnusedWarnings.Locals
def warnUnusedParams = warnUnusedExplicits || warnUnusedImplicits
def warnUnusedExplicits = warnUnused contains UnusedWarnings.Explicits
def warnUnusedImplicits = warnUnused contains UnusedWarnings.Implicits
def warnUnusedNowarn = warnUnused contains UnusedWarnings.Nowarn
val warnExtraImplicit = BooleanSetting("-Wextra-implicit", "Warn when more than one implicit parameter section is defined.") withAbbreviation "-Ywarn-extra-implicit"
val warnSelfImplicit = BooleanSetting("-Wself-implicit", "Warn when an implicit resolves to an enclosing self-definition.") withAbbreviation "-Ywarn-self-implicit"
// Experimental lint warnings that are turned off, but which could be turned on programmatically.
// They are not activated by -Xlint and can't be enabled on the command line because they are not
// created using the standard factory methods.
val warnValueOverrides = {
val flag = new BooleanSetting("value-overrides", "Generated value class method overrides an implementation.")
flag.value = false
flag
}
// Lint warnings
object LintWarnings extends MultiChoiceEnumeration {
class LintWarning(name: String, help: String) extends Choice(name, help)
def LintWarning(name: String, help: String) = new LintWarning(name, help)
val AdaptedArgs = LintWarning("adapted-args", "An argument list was modified to match the receiver.")
val NullaryUnit = LintWarning("nullary-unit", "`def f: Unit` looks like an accessor; add parens to look side-effecting.")
val Inaccessible = LintWarning("inaccessible", "Warn about inaccessible types in method signatures.")
val NullaryOverride = LintWarning("nullary-override", "Non-nullary `def f()` overrides nullary `def f`.")
val InferAny = LintWarning("infer-any", "A type argument was inferred as Any.")
val MissingInterpolator = LintWarning("missing-interpolator", "A string literal appears to be missing an interpolator id.")
val DocDetached = LintWarning("doc-detached", "When running scaladoc, warn if a doc comment is discarded.")
val PrivateShadow = LintWarning("private-shadow", "A private field (or class parameter) shadows a superclass field.")
val TypeParameterShadow = LintWarning("type-parameter-shadow", "A local type parameter shadows a type already in scope.")
val PolyImplicitOverload = LintWarning("poly-implicit-overload", "Parameterized overloaded implicit methods are not visible as view bounds.")
val OptionImplicit = LintWarning("option-implicit", "Option.apply used an implicit view.")
val DelayedInitSelect = LintWarning("delayedinit-select", "Selecting member of DelayedInit.")
val PackageObjectClasses = LintWarning("package-object-classes", "Class or object defined in package object.")
val StarsAlign = LintWarning("stars-align", "In a pattern, a sequence wildcard `_*` should match all of a repeated parameter.")
val Constant = LintWarning("constant", "Evaluation of a constant arithmetic expression resulted in an error.")
val Unused = LintWarning("unused", "Enable -Wunused:imports,privates,locals,implicits,nowarn.")
val NonlocalReturn = LintWarning("nonlocal-return", "A return statement used an exception for flow control.")
val ImplicitNotFound = LintWarning("implicit-not-found", "Check @implicitNotFound and @implicitAmbiguous messages.")
val Serial = LintWarning("serial", "@SerialVersionUID on traits and non-serializable classes.")
val ValPattern = LintWarning("valpattern", "Enable pattern checks in val definitions.")
val EtaZero = LintWarning("eta-zero", "Usage `f` of parameterless `def f()` resulted in eta-expansion, not empty application `f()`.")
val EtaSam = LintWarning("eta-sam", "The Java-defined target interface for eta-expansion was not annotated @FunctionalInterface.")
val Deprecation = LintWarning("deprecation", "Enable -deprecation and also check @deprecated annotations.")
val ByNameImplicit = LintWarning("byname-implicit", "Block adapted by implicit with by-name parameter.")
val RecurseWithDefault = LintWarning("recurse-with-default", "Recursive call used default argument.")
val UnitSpecialization = LintWarning("unit-special", "Warn for specialization of Unit in parameter position.")
def allLintWarnings = values.toSeq.asInstanceOf[Seq[LintWarning]]
}
import LintWarnings._
def warnAdaptedArgs = lint contains AdaptedArgs
def warnNullaryUnit = lint contains NullaryUnit
def warnInaccessible = lint contains Inaccessible
def warnNullaryOverride = lint contains NullaryOverride
def warnInferAny = lint contains InferAny
def warnMissingInterpolator = lint contains MissingInterpolator
def warnDocDetached = lint contains DocDetached
def warnPrivateShadow = lint contains PrivateShadow
def warnTypeParameterShadow = lint contains TypeParameterShadow
def warnPolyImplicitOverload = lint contains PolyImplicitOverload
def warnOptionImplicit = lint contains OptionImplicit
def warnDelayedInit = lint contains DelayedInitSelect
def warnPackageObjectClasses = lint contains PackageObjectClasses
def warnStarsAlign = lint contains StarsAlign
def warnConstant = lint contains Constant
def lintUnused = lint contains Unused
def warnNonlocalReturn = lint contains NonlocalReturn
def lintImplicitNotFound = lint contains ImplicitNotFound
def warnSerialization = lint contains Serial
def lintValPatterns = lint contains ValPattern
def warnEtaZero = lint contains EtaZero
def warnEtaSam = lint contains EtaSam
def lintDeprecation = lint contains Deprecation
def warnByNameImplicit = lint contains ByNameImplicit
def warnRecurseWithDefault = lint contains RecurseWithDefault
def unitSpecialization = lint contains UnitSpecialization
// The Xlint warning group.
val lint = MultiChoiceSetting(
name = "-Xlint",
helpArg = "warning",
descr = "Enable recommended warnings",
domain = LintWarnings,
default = Some(List("_"))
).withPostSetHook { s =>
if (s contains Unused) warnUnused.enable(UnusedWarnings.Linted)
else warnUnused.disable(UnusedWarnings.Linted)
if (s.contains(Deprecation) && deprecation.isDefault) deprecation.value = true
}
// Backward compatibility.
@deprecated("Use fatalWarnings", "2.11.0") def Xwarnfatal = fatalWarnings // used by sbt
private lazy val warnSelectNullable = BooleanSetting("-Xcheck-null", "This option is obsolete and does nothing.")
@deprecated("This option is being removed", "2.11.0") def Xchecknull = warnSelectNullable // used by ide
@deprecated("Use warnDeadCode", "2.11.0") def Ywarndeadcode = warnDeadCode // used by ide
}