Commit Graph

300 Commits

Author SHA1 Message Date
Eugene Yokota 2b621869fc Check for object autoImport in auto plugins. Fixes #1314 2014-05-08 21:54:04 -04:00
Josh Suereth af1c581cbb Rework sbt's loading mechanism to allow `ProjectManipulation` DSL entries to take effect.
This does the following:

* Fragments loading into two stages:  Discovery + Resolution
* Discovery just looks for .sbt files and Projects, while
  loading/compiling them.
* Resolution is responsible for taking discovered projects and
  loaded sbt files and globbing everything together.  This includes
  feeding the project through various manipulations, applying
  AutoPlugin settings/configurations and ordering all the settings.
* Add a bunch of docs
* Add direct DSL `enablePlugins` and test
* Add direct DSL `disablePlugins` and test.
2014-05-07 12:35:17 -04:00
Josh Suereth 746583e718 Alter the DSL slightly to use explicit DslEntry types for settings.
* Create new DSLEntry type for settings so we can categorize what we parse
* Use DSLEntry to help solve the Setting[_] vs. Seq[Setting[_]] implicit fun.
* Hack away any non-Setting[_] DSLEntry for now.
* Add test in build.sbt to make sure the new DSL works.
2014-05-07 12:35:17 -04:00
eugene yokota d198ea4099 Merge pull request #1316 from sbt/wip/fix-broken-build
This doesn't quite fix the build, but gets closer
2014-05-07 12:23:09 -04:00
Josh Suereth 244abd3b6f Scalariforming test code 2014-05-07 11:52:23 -04:00
Martynas Mickevicius f11d3dbce4 Sort setting key names in the inspect tree view. 2014-05-07 14:32:10 +02:00
Eugene Yokota 785b0274ee some more source getting formatted 2014-05-02 18:07:05 -04:00
Eugene Yokota adb41611cf added scalariform 2014-05-01 12:50:07 -04:00
Dan Sanduleac f485270adf Put sbt's derived settings under GlobalScope 2014-05-01 01:35:48 +01:00
Dan Sanduleac 3161d75a41 Decouple DefaultSetting from Setting/DerivedSetting; BuildCommon.derive() produces default settings by default 2014-05-01 01:35:48 +01:00
Jacek Laskowski 95b976b6d4 Detailed help for the reload command (following project's) 2014-04-24 23:53:31 +02:00
eugene yokota 1819276bb8 Merge pull request #1278 from sbt/wip/junit-xml-reporter
Migrate JUnitXmlReporter into sbt as autoplugin
2014-04-22 16:53:02 -04:00
eugene yokota 9d86d56797 Merge pull request #1277 from sbt/fix/issue-1267
Separate location of analysis cache if we're cross compiling scala.
2014-04-22 13:45:49 -04:00
Josh Suereth fc3f6dd1d9 Remove enabling key for JunitXmlReportPlugin.
This migrates JunitXmlReportPlugin to work the way we desire
new sbt features/plugins to work:

* Enabling the feature is having the plugin available.
* Disabling the feature is disabling the plugin
* All code/settings for the feature are isolated to the plugin.
2014-04-22 11:23:15 -04:00
Josh Suereth f5dd022551 Separate location of analysis cache if we're cross compiling scala.
* Add task to determine file-name of analysis cache
* If crossPaths := true, then add scala binary version to the analysis cache name.

This makes it possible to leverage incremental compilation with the `+` command.

Fixes #1267
2014-04-22 11:12:59 -04:00
Josh Suereth 447ae8b1d8 Migrate JUnitXmlReport into an autoplugin. 2014-04-22 10:38:35 -04:00
Bruno Bieth b38b86add5 Added a test reporter for JUnit XML
Taken from https://github.com/chenkelmann/junit_xml_listener and slightly improved.
Activating is now just a matter of setting `testReportJUnitXml` to true.
This not only brings a very handy feature (hudson/jenkins support that syntax),
but gives more options for testing the SBT test infrastructure.
For instance checking that the test output is well segregated during a parallel
test run is just a matter of checking the report output.

Conflicts:
	main/src/main/scala/sbt/Keys.scala
2014-04-22 08:36:52 -04:00
Josh Suereth e076bfa970 Automatically run GC/finalization after each task execution.
Fixes #1223.

* Add a new key to disable forcing the garbage collector to run
  after each task-executioin
* Add a new flag to disable forcing the garbage collector to run
  after each task-exeuction
* Add a hook into EvalauteTask to run System.gc/System.runFinalization
  after each task execution

Review by @eed3si9n
2014-04-21 11:08:05 -04:00
eugene yokota 72d3c4e3eb Merge pull request #1255 from sbt/wip/remove-depreated-evaluate-task-call
Remove deprecated EvaluateTask usage for new, easier to update variant.
2014-04-16 14:33:10 -04:00
eugene yokota 583391a069 Merge pull request #1263 from sbt/wip/docs-and-cleanups
addPlugins => enablePlugins
2014-04-16 13:59:40 -04:00
Antonio Cunei 75f0438946 Use the correct state in buildPluginDefinition()
Within buildPluginDefinition(), the call to setProject() can
(and usually will) return a modified structure together with
the new state.

The subsequent call to evalPluginDef() should use the updated
structure, rather the old stucture that was present before
the setProject() ("pluginDef"); if that is not the case,
the code called by evalPluginDef() will find an inconsistent
structure/state combination, and behave in bizarre ways as
a result.

More in general, it is a bit dangerous to pass to routines
in parallel the two separate state and structure, as the
two may easily inadvertently fall out of alignment, as in this
case.

This patch should be applied to both the 0.13 branch as well
as to a future 0.12.5 release (the corresponding file there
is ./main/Load.scala).
2014-04-16 17:56:49 +02:00
Josh Suereth 51ee5048f0 Rename `addPlugins` to `enablePlugins` to better represent what it does.
This is to disambiguate between `addSbtPlugin` and `enablePlugins` for
autoplugins.
2014-04-15 14:38:11 -04:00
Josh Suereth 1c3231f017 Documentation for EvaluateConfigurations class. 2014-04-15 13:22:40 -04:00
Grzegorz Kossakowski b665b7ecee Merge pull request #1254 from gkossakowski/classFileManager-logging
Add debug logging in ClassfileManager
2014-04-13 16:05:18 +02:00
Grzegorz Kossakowski a7fb54e4df Add debug logging in ClassfileManager
Add logging of various operations the transactional class file manager is
doing. You can pass logger to be used by the transactional class file
manager by using overloaded definition of `ClassfileManager.transactional`
method. The old overload has been deprecated.

The factory methods for class file manager in IncOptions companion object
has been deprecated in favor of using ClassfileManager companion object
directly. The code in Defaults.scala has been updated to use non-deprecated
methods. The logging is turned off by default.

The canonical way of enabling transactional class file manager in sbt
project is:

```
incOptions := incOptions.value.withNewClassfileManager(
  sbt.inc.ClassfileManager.transactional(
    crossTarget.value / "classes.bak",
    (streams in (compile, Compile)).value.log
  )
)
```

It's a bit verbose which shows that the api for this is not the best.
However, I don't expect sbt users to need this code very often.

This patch should help debug the problem described in #1184
2014-04-11 13:42:21 +02:00
Josh Suereth 004d9c3f4a Remove deprecated EvaluateTask usage for new, easier to update variant. 2014-04-10 15:51:55 -04:00
Josh Suereth bc07810f7e Mark new method private[sbt] because no one else should use it. 2014-04-10 13:17:39 -04:00
Josh Suereth 22b99a9a1c Autoplugin confgiurations must be injected first into project.
Fixes #1247
2014-04-10 10:12:00 -04:00
Josh Suereth 10afd46785 Merge pull request #1252 from gkossakowski/hang-in-loading-global-plugins
Pick the right overload in EvaluateTask.runTask
2014-04-10 09:28:51 -04:00
Grzegorz Kossakowski 7fead66244 Pick the right overload in EvaluateTask.runTask
The deprecated method should forward to the other overloaded alternative
but it recursed instead.

This kind of mistake would be easily caught by linter warning about
unused `newConfig` local variable. I hope we'll get there some day.

Fixes #1251
2014-04-10 15:24:07 +02:00
Indrajit Raychaudhuri 7179912387 `DefaultOptions` for resolvers should not resets existing values.
`DefaultOptions.addResolvers` and `DefaultOptions.addPluginResolvers`
should not reset the existing value while adding the new ones. The
names are prefixed with _add_ afterall.
2014-04-10 03:25:54 -05:00
eugene yokota 59b834c679 Merge pull request #1225 from japgolly/shhh_tests
Added setting 'testResultLogger' which allows customisation of test reporting.
2014-04-09 10:37:44 -07:00
Josh Suereth 43c25beeed Fix infinite loop of death. 2014-04-09 10:11:21 -04:00
David Barri 195129a3e7 Added TestResultLogger for customising test feedback.
1) When `test` is run and there are no tests available, omit logging output.
   Especially useful for aggregate modules. `test-only` et al unaffected. (#1185)

2) Added a new setting `testResultLogger` to allow customisation of logging of test results.
2014-04-09 19:14:29 +10:00
Josh Suereth 3890c98115 Remove mutability from the task cancel api.
* Rename TaskCancel to RunningTaskEngine for clarity
* Explicitly pass a state value in TaskCancellationStrategy
* Update hooks to be immutable/safe.
2014-04-08 20:59:50 -04:00
Josh Suereth f42dee8090 Naming fixes to TaskCancellationStrategy to be clearer. 2014-04-08 12:08:30 -04:00
Josh Suereth 8f1ef5395d Improve scaladoc comments for the task cancellation api. 2014-04-08 11:09:23 -04:00
Josh Suereth 171eb19b96 Part #2 of task cancellation hooks.
* Expose new EvaluateTaskConfig throughout all the APIs
* Create a key for cancellation configuration
* Add default values for cancellation in GlobalPlugin
* Create a test to ensure that cancellation can cancel tasks.
* Deprecate all the existing mechanisms of evaluating tasks which
  use the EvaluateConfig API.
2014-04-08 09:23:49 -04:00
Josh Suereth 6e480fc2b6 Fix deprecated 'since' clauses to reflect our actual release versions. 2014-04-07 16:54:32 -04:00
Josh Suereth 2686acd993 Part #1 of cancel-task-hooks - Hooks EvaluateTask.
* Create a new EvaluateTaskConfig which gives us a bit more freedom
  over changign config options to EvaluateTask in the future.
* Create adapted from old EvaluateTask to new EvaluateTask
* Add hooks into signals class to register/remote  a signal listener
  directly, rather than in an "arm" block.
* Create TaskEvaluationCancelHandler to control the strategy of
  who/whom can cancel (sbt-server vs. sbt-terminal).
* Create a null-object for the "can't cancel" scenario so the
  code path is exactly the same.

This commit does not wire settings into the build yet, nor does it
fix the config extractio methods.
2014-04-07 16:42:08 -04:00
Josh Suereth d8e2f594d1 Merge pull request #1065 from jaceklaskowski/string-interpolation-follow-deprecation
Use string interpolation and replace deprecated methods
2014-04-07 11:22:19 -04:00
Eugene Yokota 5f7e68c7dd Auto plugin names are imported with or without autoImport. Fixes #1217 2014-03-27 17:36:40 -04:00
eugene yokota 9dde1ac46e Merge pull request #1215 from eed3si9n/topic/renameaddsettings
Deprecate autoSettings, Rename ProjectSettings => BuildScalaFiles
2014-03-26 14:36:46 -04:00
Eugene Yokota 4f969491d0 Deprecate autoSettings, Rename ProjectSettings => BuildScalaFiles
* autoSettings is renamed to settingSets. Since this was part of 0.13.0
we need to deprecate it first.
2014-03-26 11:35:50 -04:00
Eugene Yokota 1debc48568 Rename GlobalModule -> CorePlugin 2014-03-25 15:49:07 -04:00
Eugene Yokota 3f2f12f5bb Fix PluginsTest 2014-03-25 01:49:08 -04:00
Eugene Yokota 575e657962 Default AutoPlugin to an empty root plugin 2014-03-25 00:20:11 -04:00
Eugene Yokota ff77d0b0f2 Remove def autoImport: Any from AutoPlugin. 2014-03-24 23:04:22 -04:00
Eugene Yokota cc80d216ab Adjusting to 0.13 changes 2014-03-24 20:03:01 -04:00
Eugene Yokota 2c654b2d90 Unifies AutoPlugin and AutoImport. Fixes #1188
* AutoImport trait is subsumed by def autoImport method under
AutoPlugin class.
* When def autoImport is overridden by a lazy val or a val, *.sbt
automatically imports autoImport._.
2014-03-24 19:10:35 -04:00
Eugene Yokota d697c10950 Hide unary_! operator from API 2014-03-24 18:59:14 -04:00
Eugene Yokota 5b1c33dd6e Added conflict report and unit tests 2014-03-22 02:47:11 -04:00
Eugene Yokota e95935a7db Adds conflict check at the end to enforce exclusion requirements. 2014-03-21 01:06:00 -04:00
Eugene Yokota c7dc499fe4 Updated comments. Typo fix per @jozic 2014-03-20 21:47:49 -04:00
Eugene Yokota f8bedf4012 Unifies AutoPlugin and RootPlugin
* Separates def select into def trigger and def requires.
* Setting trigger = noTrigger and requires = empty makes a plugin a
root.
2014-03-20 07:08:33 -04:00
James Roper 9f20f04e16 Allow end users to add Plugins, not just AutoPlugins
This allows plugins to define a Plugins instance that captures both the
plugin and its required dependencies.

Also fixed up some scaladocs that were wrong.
2014-03-18 19:49:38 +11:00
Josh Suereth 7c15eb01f3 When fragmenting Defaults, we mixed back settings in the wrong order.
* packageArtifacts is not cleared by defautlSettings
* Added a test for this behavior (this one test should ensure the ordering for most settings is correct.)

Fixes #1176
2014-03-12 08:50:37 -04:00
Josh Suereth c2f61460c6 Merge pull request #1169 from sbt/wip/fix-override-default
Fix overwrite default to true in deprecated method calls.
2014-03-10 17:17:49 -04:00
Josh Suereth 7413fbe9c0 Doc fix ups from review.
* Fix plugin mispellings
* Clarify `select` behavior.
2014-03-10 16:12:05 -04:00
Josh Suereth 893794a8ba Fix overwrite default to true in deprecated method calls.
We cannot break existing users, but we can deprecate the improper usage.
This is part #2 of the workaround for #1156.  This ensures that
users will stop using the legacy methods after 0.13.2 is out.
2014-03-10 10:44:38 -04:00
Josh Suereth 548b38c7f8 Add note about not exposing fine-grained autoplugin inclusion controlls.
AddSettings should only expose coarse-grained features of AutoPlugins
or else the Logic we use to ensure safe addition completely breaks
down.  Leaving it in the code as an escape hatch if we get desparate,
but we need an alternative for controlling ordering later.
2014-03-10 09:45:25 -04:00
Josh Suereth 3576baa76c Split Defaults.scala into three plugins: Global,Ivy,Jvm.
* GlobalPlugin has defaults for controlling parallelism on tasks, basic command stuff.
* IvyModule has the configuration for resolving/publishing modules to ivy, assuming
  each project is a single module.
* JvmModule has the configuration for compiling/running/testing/packaging Java/Scala
  projects.
2014-03-10 09:45:25 -04:00
Josh Suereth a44a14f2c8 AutoPlugins appropriately participate in AddSettings.
* Add new AutoPlugins type to AddSettings.
* Ensure any Plugins filter doesn't just automatically always add
  autoplugins every time.
* Load.scala can now adjust AutoPlugins ordering

Note: Adjusting autoplugin ordering is dangerous BUT doing a glob
      of "put autoplugin settings here" is generally ok.
2014-03-10 09:45:25 -04:00
Josh Suereth ac9391066b Allow Build.scala project settings to be ordered via AddSettings.
* Create new AddSettings.ProjectSettings that can be used in the Addsettings order.
* Update Load.scala to correctly abide by AddSettings orderings.
2014-03-10 09:45:25 -04:00
Josh Suereth 7f8d21c2f1 Remove Natures from AutoPlugins feature.
* remove the notion of Natures from Autoplugins.
* Update tests to use AutoPlugins with no selection for inclusion.
* Rename exisitng Natures code to Plugins/PluginsDebug.
2014-03-10 09:45:25 -04:00
Josh Suereth dbb47b3ce8 Updates `last` and `export` commands to read from correct key.
Fixes #1155.

It seems that somehow during the 0.13.{1 -> 2 } transition, we
stopped pointing at the correct key for TaskKeys (either that or
task streams are now all associated with the `streams` key).  I
think this may have been inadvertently caused from several
refactorings to enable greater control over the execution of tasks.

This points the `last*` methods at the correct key for tasks,
fixing both `last <key>` and `export <key>` commands.
2014-03-08 14:09:44 -05:00
Josh Suereth a8acc11fb5 Merge pull request #1130 from sbt/wip/auto-plugins
AUTO PLUGIN FEATURE!!!!
2014-02-20 16:08:01 -05:00
Mark Harrah 90134b3af0 'plugins' and 'plugin <name>' commands to inspect plugins
* 'plugins' displays the list of plugins available for each build along with the project IDs each is enabled on
* 'plugin <name>' displays information about a specific plugin in the context of the current project
 - if the plugin is activated on the current project and if so, information about the keys/configurations it provides
 - how the plugin could be activated if possible
* tries to detect when it is run on an aggregating project and adjusts accordingly
 - indicates if an aggregated project has the plugin activated
 - indicates to change to the specific project to get the right context

This is a rough implementation and needs lots of polishing and deduplicating.
The help for the commands needs to be added/expanded.
2014-02-20 13:56:50 -05:00
Mark Harrah 2bf127aaf6 Make BuildDependencies construction a proper function outside of the settings sytem. 2014-02-20 13:28:02 -05:00
Mark Harrah a3d89dc865 Infrastructure for debugging natures and plugins.
* Can provide suggestions for how to define a plugin given a context (a loaded Project in practice).
* When a user requests an undefined key at the command line, can indicate whether any (deactivated) plugins provide the key.

TODO:
* Hook up to the key parser
* Implement 'help <plugin>'
* Determine how to best provide the context (the current project is often an aggregating root, which is not typically a useful context)
2014-02-19 23:04:10 -05:00
Mark Harrah 49bf842b3d Restructure Natures/AutoPlugin types
- remove AutoPlugin.provides
 * name comes from module name
 * AutoPlugin is Nature-like via Basic
- Project.addNatures only accepts varags of Nature values
 * enforces that a user cannot explicitly enable an AutoPlugin
 * drops need for && and - combinators
- Project.excludeNatures accepts varags of AutoPlugin values
 * enforces that only AutoPlugins can be excluded
 * drops need for && and - combinators
2014-02-08 10:23:31 -05:00
Mark Harrah e037731d81 TODO 2014-02-08 10:23:31 -05:00
Mark Harrah eb7da2f689 move Nature-related classes to Natures.scala 2014-02-08 10:23:31 -05:00
Mark Harrah 0fc5f1525e Generate error when multiple AutoPlugins provide the same Nature. 2014-02-08 10:23:31 -05:00
Mark Harrah 708a3b107b minor API updates 2014-02-08 10:23:31 -05:00
Mark Harrah 4feb7d3dc8 Fix typos in AutoPlugin API docs. 2014-02-08 10:23:31 -05:00
Josh Suereth 85753e4035 Merge pull request #1100 from dansanduleac/sessionSettings2
Fixed SessionSettings replacing existing setting
2014-02-02 04:24:49 -08:00
Dan Sanduleac 8bfab5313e Fixed SessionSettings replacing existing setting 2014-01-27 14:55:08 +00:00
Mark Harrah 9264099594 API docs, better terminology for negative cycle checking in logic system. 2014-01-24 14:36:46 -05:00
Mark Harrah 1afd1931c4 Translate errors from logic system to Natures system. 2014-01-24 14:36:46 -05:00
Mark Harrah 09c76f29a3 Discover all sbt-related modules (not just Plugin) and write names to resources for use from binaries. 2014-01-24 14:36:20 -05:00
Mark Harrah 7a38338509 logic system/auto-plugins: Provide deprecated methods for binary compatibility 2014-01-24 14:35:59 -05:00
Mark Harrah 30658f98bb API documentation and comments related to natures 2014-01-24 14:34:15 -05:00
Mark Harrah b8619f4aae Main part of integrating natures into project loading. 2014-01-24 14:34:15 -05:00
Mark Harrah 322f6de655 Logic system supporting auto plugins and initial outline of AutoPlugin and Natures types.
* Not integrated into project loading
 * Doesn't yet check that negation is acyclic before execution
2014-01-24 14:30:12 -05:00
Dan Sanduleac ba4d57b120 Fix binary compatibility with 0.13 2014-01-23 12:07:37 +00:00
Dan Sanduleac 0199a93ffb Expose overwrite flag in IvyActions.publish, and by default only overwrite if it's a snapshot 2014-01-17 10:45:57 +00:00
Josh Suereth 2abe7574df Fixes to the internal API hooks for the sbt server.
* Alter the TaskProgress listener key to be `State => TaskProgress` so it
  can be instantiated from the current server/sbt state.
* Expose the xsbti.Reporter interface for compilation through to sbt builds.
2014-01-14 12:42:40 -05:00
Jacek Laskowski f49ed56c1f Use string interpolation and replace deprecated methods 2014-01-06 14:17:42 +01:00
xuwei-k b6e16f1e95 fix CommandStrings.settingsDetailed 2014-01-05 23:40:02 +09:00
Dan Sanduleac eb8077427e Fix saving session settings 2014-01-02 09:18:54 -05:00
Mark Harrah c669606999 TaskKey[T].previous: Option[T], which returns the value of the task the last time it executed.
This requires a Format[T] to be implicitly available at the call site and requires the task
to be referenced statically (not in a settingDyn call).  References to previous task values
in the form of a ScopedKey[Task[T]] + Format[T] are collected at setting load time in the
'references' setting.  These are used to know which tasks should be persisted (the ScopedKey)
and how to persist them (the Format).

When checking/delegating previous references, rules are slightly different.

A normal reference from a task t in scope s cannot refer to t in s unless
there is an earlier definition of t in s.  However, a previous reference
does not have this restriction.  This commit modifies validateReferenced
to allow this.

TODO: user documentation
TODO: stable selection of the Format when there are multiple .previous calls on the same task
TODO: make it usable in InputTasks, specifically Parsers
2013-12-06 20:45:01 -05:00
Mark Harrah 5d49fcbe78 Include the key name in the streams backing file path to avoid collisions. 2013-12-06 20:43:48 -05:00
Mark Harrah 21a05978de Fix parsing and evaluation of 'all' and 'show'. See comment in evaluatingParser. 2013-12-06 20:43:48 -05:00
Mark Harrah ad60e6c794 Basic predicate combinators for Tags 2013-11-26 22:46:50 -05:00
Mark Harrah d38450b41f Command to run multiple tasks concurrently: 'all a b'. Fixes #628. 2013-11-26 22:46:49 -05:00
Mark Harrah 13041bfb9a Don't mark ExceptionInInitializerError as incompatible plugins: rethrow the cause instead. Fixes #1007. 2013-11-25 21:03:40 -05:00
Mark Harrah 5f7a327e5e Add -Dsbt.cli.nodelegation option to experiment with no delegation for running/showing tasks/settings from the command line.
With this set to true, the following is no longer allowed for example:

> compile:update
2013-11-25 21:03:40 -05:00
Mark Harrah e268db3f80 Propagate argument to 'reload' to load failure handling command. Fixes #973. 2013-11-24 15:19:24 -05:00
Mark Harrah 3b213e59ca Remove the need for resetLocalAttrs. Fixes #994, #952.
The fix was made possible by the very helpful information provided by @retronym.

This commit does two key things:
 1. changes the owner when splicing original trees into new trees
 2. ensures the synthetic trees that get spliced into original trees do not need typechecking

Given this original source (from Defaults.scala):

  ...
  lazy val sourceConfigPaths = Seq(
    ...
    unmanagedSourceDirectories := Seq(scalaSource.value, javaSource.value),
    ...
  )
  ...

After expansion of .value, this looks something like:

    unmanagedSourceDirectories := Seq(
      InputWrapper.wrapInit[File](scalaSource),
      InputWrapper.wrapInit[File](javaSource)
    )

where wrapInit is something like:

    def wrapInit[T](a: Any): T

After expansion of := we have (approximately):

    unmanagedSourceDirectories <<=
      Instance.app( (scalaSource, javaSource) ) {
        $p1: (File, File) =>
          val $q4: File = $p1._1
          val $q3: File = $p1._2
          Seq($q3, $q4)
      }

So,

 a) `scalaSource` and `javaSource` are user trees that are spliced into a tuple constructor after being temporarily held in `InputWrapper.wrapInit`
 b) the constructed tuple `(scalaSource, javaSource)` is passed as an argument to another method call (without going through a val or anything) and shouldn't need owner changing
 c) the synthetic vals $q3 and $q4 need their owner properly set to the anonymous function
 d) the references (Idents) $q3 and $q4 are spliced into the user tree `Seq(..., ...)` and their symbols need to be the Symbol for the referenced vals
 e) generally, treeCopy needs to be used when substituting Trees in order to preserve attributes, like Types and Positions

changeOwner is called on the body `Seq($q3, $q4)` with the original owner sourceConfigPaths to be changed to the new anonymous function.
In this example, no owners are actually changed, but when the body contains vals or anonymous functions, they will.

An example of the compiler crash seen when the symbol of the references is not that of the vals:

symbol value $q3 does not exist in sbt.Defaults.sourceConfigPaths$lzycompute
	at scala.reflect.internal.SymbolTable.abort(SymbolTable.scala:49)
	at scala.tools.nsc.Global.abort(Global.scala:254)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadIdent$1(GenICode.scala:1038)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:1044)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1246)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genLoadArguments$1.apply(GenICode.scala:1244)
   ...

Other problems with the synthetic tree when it is spliced under the original tree often result in type mismatches or some other compiler error that doesn't result in a crash.

If the owner is not changed correctly on the original tree that gets spliced under a synthetic tree, one way it can crash the compiler is:

java.lang.IllegalArgumentException: Could not find proxy for val $q23: java.io.File in List(value $q23, method apply, anonymous class $anonfun$globalCore$5, value globalCore, object Defaults, package sbt, package <root>) (currentOwner= value dir )
   ...
     while compiling: /home/mark/code/sbt/main/src/main/scala/sbt/Defaults.scala
        during phase: global=lambdalift, atPhase=constructors
   ...
  last tree to typer: term $outer
              symbol: value $outer (flags: <synthetic> <paramaccessor> <triedcooking> private[this])
   symbol definition: private[this] val $outer: sbt.BuildCommon
                 tpe: <notype>
       symbol owners: value $outer -> anonymous class $anonfun$87 -> value x$298 -> method derive -> class BuildCommon$class -> package sbt
      context owners: value dir -> value globalCore -> object Defaults -> package sbt
   ...

The problem here is the difference between context owners and the proxy search chain.
2013-11-22 13:08:10 -05:00