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/* __ *\
** ________ ___ / / ___ __ ____ Scala.js tools **
** / __/ __// _ | / / / _ | __ / // __/ (c) 2013-2014, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ |/_// /_\ \ http://scala-js.org/ **
** /____/\___/_/ |_/____/_/ | |__/ /____/ **
** |/____/ **
\* */
package scala.scalajs.tools.optimizer
import scala.scalajs.tools.sem.Semantics
import scala.scalajs.tools.classpath._
import scala.scalajs.tools.logging._
import scala.scalajs.tools.io._
import scala.scalajs.tools.corelib.CoreJSLibs
import com.google.javascript.jscomp.{
SourceFile => ClosureSource,
Compiler => ClosureCompiler,
CompilerOptions => ClosureOptions,
_
}
import scala.collection.JavaConverters._
import scala.collection.immutable.{Seq, Traversable}
import java.net.URI
/** Scala.js Closure optimizer: does advanced optimizations with Closure. */
class ScalaJSClosureOptimizer(semantics: Semantics) {
import ScalaJSClosureOptimizer._
private def toClosureSource(file: VirtualJSFile) =
ClosureSource.fromReader(file.toURI.toString(), file.reader)
private def toClosureInput(file: VirtualJSFile) =
new CompilerInput(toClosureSource(file))
/** Fully optimizes an [[IRClasspath]] by asking the ScalaJSOptimizer to
* emit a closure AST and then compiling this AST directly
*/
def optimizeCP(optimizer: ScalaJSOptimizer,
inputs: Inputs[ScalaJSOptimizer.Inputs[IRClasspath]],
outCfg: OutputConfig, logger: Logger): LinkedClasspath = {
val cp = inputs.input.input
CacheUtils.cached(cp.version, outCfg.output, outCfg.cache) {
logger.info(s"Full Optimizing ${outCfg.output.path}")
val irFastOptInput =
inputs.input.copy(input = inputs.input.input.scalaJSIR)
val irFullOptInput = inputs.copy(input = irFastOptInput)
optimizeIR(optimizer, irFullOptInput, outCfg, logger)
}
new LinkedClasspath(cp.jsLibs, outCfg.output, cp.requiresDOM, cp.version)
}
def optimizeIR(optimizer: ScalaJSOptimizer,
inputs: Inputs[ScalaJSOptimizer.Inputs[Traversable[VirtualScalaJSIRFile]]],
outCfg: OutputConfig, logger: Logger): Unit = {
// Build Closure IR via ScalaJSOptimizer
val builder = new ClosureAstBuilder(outCfg.relativizeSourceMapBase)
optimizer.optimizeIR(inputs.input, outCfg, builder, logger)
// Build a Closure JSModule which includes the core libs
val module = new JSModule("Scala.js")
for (lib <- CoreJSLibs.libs(semantics))
module.add(toClosureInput(lib))
val ast = builder.closureAST
module.add(new CompilerInput(ast, ast.getInputId(), false))
for (export <- inputs.additionalExports)
module.add(toClosureInput(export))
// Compile the module
val closureExterns =
(ScalaJSExternsFile +: inputs.additionalExterns).map(toClosureSource)
val options = closureOptions(outCfg)
val compiler = closureCompiler(logger)
val result = GenIncOptimizer.logTime(logger, "Closure Compiler pass") {
compiler.compileModules(
closureExterns.asJava, List(module).asJava, options)
}
GenIncOptimizer.logTime(logger, "Write Closure result") {
writeResult(result, compiler, outCfg.output)
}
}
private def writeResult(result: Result, compiler: ClosureCompiler,
output: WritableVirtualJSFile): Unit = {
val outputContent = if (result.errors.nonEmpty) ""
else "(function(){'use strict';" + compiler.toSource + "}).call(this);\n"
val sourceMap = Option(compiler.getSourceMap())
// Write optimized code
val w = output.contentWriter
try {
w.write(outputContent)
if (sourceMap.isDefined)
w.write("//# sourceMappingURL=" + output.name + ".map\n")
} finally w.close()
// Write source map (if available)
sourceMap.foreach { sm =>
val w = output.sourceMapWriter
try sm.appendTo(w, output.name)
finally w.close()
}
}
private def closureOptions(optConfig: OptimizerConfig,
noSourceMap: Boolean = false) = {
val options = new ClosureOptions
options.prettyPrint = optConfig.prettyPrint
CompilationLevel.ADVANCED_OPTIMIZATIONS.setOptionsForCompilationLevel(options)
options.setLanguageIn(ClosureOptions.LanguageMode.ECMASCRIPT5)
options.setCheckGlobalThisLevel(CheckLevel.OFF)
if (!noSourceMap && optConfig.wantSourceMap) {
options.setSourceMapOutputPath(optConfig.output.name + ".map")
options.setSourceMapDetailLevel(SourceMap.DetailLevel.ALL)
}
options
}
private def closureCompiler(logger: Logger) = {
val compiler = new ClosureCompiler
compiler.setErrorManager(new LoggerErrorManager(logger))
compiler
}
}
object ScalaJSClosureOptimizer {
/** Inputs of the Scala.js Closure optimizer. */
final case class Inputs[T](
/** Input to optimize (classpath or file-list) */
input: T,
/** Additional externs files to be given to Closure. */
additionalExterns: Seq[VirtualJSFile] = Nil,
/** Additional exports to be given to Closure.
* These files are just appended to the classpath, given to Closure,
* but not used in the Scala.js optimizer pass when direct optimizing
*/
additionalExports: Seq[VirtualJSFile] = Nil
)
/** Configuration the closure part of the optimizer needs.
* See [[OutputConfig]] for a description of the fields.
*/
trait OptimizerConfig {
val output: WritableVirtualJSFile
val cache: Option[WritableVirtualTextFile]
val wantSourceMap: Boolean
val prettyPrint: Boolean
val relativizeSourceMapBase: Option[URI]
}
/** Configuration for the output of the Scala.js Closure optimizer */
final case class OutputConfig(
/** Writer for the output */
output: WritableVirtualJSFile,
/** Cache file */
cache: Option[WritableVirtualTextFile] = None,
/** If true, performs expensive checks of the IR for the used parts. */
checkIR: Boolean = false,
/** If true, the optimizer removes trees that have not been used in the
* last run from the cache. Otherwise, all trees that has been used once,
* are kept in memory. */
unCache: Boolean = true,
/** If true, no optimizations are performed */
disableOptimizer: Boolean = false,
/** If true, nothing is performed incrementally */
batchMode: Boolean = false,
/** Ask to produce source map for the output */
wantSourceMap: Boolean = false,
/** Pretty-print the output. */
prettyPrint: Boolean = false,
/** Base path to relativize paths in the source map */
relativizeSourceMapBase: Option[URI] = None
) extends OptimizerConfig with ScalaJSOptimizer.OptimizerConfig
/** Minimal set of externs to compile Scala.js-emitted code with Closure. */
val ScalaJSExterns = """
/** @constructor */
function Object() {}
Object.protoype.toString = function() {};
/** @constructor */
function Array() {}
Array.prototype.length = 0;
/** @constructor */
function Function() {}
Function.prototype.constructor = function() {};
Function.prototype.call = function() {};
Function.prototype.apply = function() {};
var global = {};
var __ScalaJSEnv = {};
"""
val ScalaJSExternsFile = new MemVirtualJSFile("ScalaJSExterns.js").
withContent(ScalaJSExterns)
}
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