scalac - Online in the Cloud

PROGRAM:

NAME

scalac - Compiler for the Scala 2 language

SYNOPSIS

scalac [ <options> ] <source files>

PARAMETERS

<options>
Command line options. See OPTIONS below.

<source files>
One or more source files to be compiled (such as MyClass.scala).

DESCRIPTION

The scalac tool reads class and object definitions, written in the Scala programming
language, and compiles them into bytecode class files.

By default, the compiler puts each class file in the same directory as its source file.
You can specify a separate destination directory with -d (see OPTIONS, below).

OPTIONS

The compiler has a set of standard options that are supported on the current development
environment and will be supported in future releases. An additional set of non-standard
options are specific to the current virtual machine implementation and are subject to
change in the future. Non-standard options begin with -X.

Standard Options
-Dproperty=value
Pass -Dproperty=value directly to the runtime system.

-J<flag>
Pass <flag> directly to the runtime system.

-P:<plugin:opt>
Pass an option to a plugin

-X Print a synopsis of advanced options.

-bootclasspath <path>
Override location of bootstrap class files (where to find the standard built-in
classes, such as "scala.List").

-classpath <path>
Specify where to find user class files (on Unix-based systems a colon-separated
list of paths, on Windows-based systems, a semicolon-separate list of paths). This
does not override the built-in ("boot") search path.

The default class path is the current directory. Setting the CLASSPATH variable or
using the -classpath command-line option overrides that default, so if you want to
include the current directory in the search path, you must include "." in the new
settings.

-d <directory|jar>
Specify where to place generated class files.

-deprecation
Emit warning and location for usages of deprecated APIs.

Available since Scala version 2.2.1

-encoding <encoding>
Specify character encoding used by source files.

The default value is platform-specific (Linux: "UTF8", Windows: "Cp1252").
Executing the following code in the Scala interpreter will return the default value
on your system:

scala> new java.io.InputStreamReader(System.in).getEncoding

-explaintypes
Explain type errors in more detail.

-extdirs <dirs>
Override location of installed extensions.

-feature
Emit warning and location for usages of features that should be imported
explicitly.

-g:{none,source,line,vars,notailcalls}
"none" generates no debugging info,

"source" generates only the source file attribute,

"line" generates source and line number information,

"vars" generates source, line number and local variable information,

"notailcalls" generates all of the above and will not perform tail call
optimization.

-help Print a synopsis of standard options.

-javabootclasspath <path>
Override Java boot classpath.

-javaextdirs <path>
Override Java extdirs classpath.

-language:<feature>
Enable one or more language features.

-no-specialization
Ignore @specialize annotations.

-nobootcp
Do not use the boot classpath for the Scala jar files.

-nowarn
Generate no warnings

-optimise
Generates faster bytecode by applying optimisations to the program.

-print Print program with all Scala-specific features removed.

-sourcepath <path>
Specify location(s) of source files.

-target:{jvm-1.5,jvm-1.6,jvm-1.7}
"jvm-1.5" target JVM 1.5 (deprecated),

"jvm-1.6" target JVM 1.6 (default),

"jvm-1.7" target JVM 1.7,

-toolcp <path>
Add to the runner classpath.

-unchecked
Enable detailed unchecked (erasure) warnings

Non variable type-arguments in type patterns are unchecked since they are
eliminated by erasure

Available since Scala version 2.3.0

-uniqid
Uniquely tag all identifiers in debugging output.

-usejavacp
Utilize the java.class.path in classpath resolution.

-usemanifestcp
Utilize the manifest in classpath resolution.

-verbose
Output messages about what the compiler is doing

-version
Print product version and exit.

@<file>
A text file containing compiler arguments (options and source files)

Advanced Options
-Xcheckinit
Wrap field accessors to throw an exception on uninitialized access.

-Xdev Enable warnings for developers working on the Scala compiler

-Xdisable-assertions
Generate no assertions and assumptions

-Xelide-below <n>
Calls to @elidable methods are omitted if method priority is lower than argument.

-Xexperimental
Enable experimental extensions

-Xfatal-warnings
Fail the compilation if there are any warnings.

-Xfull-lubs
Retain pre 2.10 behavior of less aggressive truncation of least upper bounds.

-Xfuture
Turn on future language features.

-Xgenerate-phase-graph <file>
Generate the phase graphs (outputs .dot files) to fileX.dot.

-Xlint Enable recommended additional warnings.

-Xlog-free-terms
Print a message when reification creates a free term.

-Xlog-free-types
Print a message when reification resorts to generating a free type.

-Xlog-implicit-conversions
Print a message whenever an implicit conversion is inserted.

-Xlog-implicits
Show more detail on why some implicits are not applicable.

-Xlog-reflective-calls
Print a message when a reflective method call is generated.

-Xmacro-settings:<option>
Custom settings for macros.

-Xmain-class <path>
Class for manifest's Main-Class entry (only useful with -d <jar>).

-Xmax-classfile-name <n>
Maximum filename length for generated classes.

-Xmigration:<version>
Warn about constructs whose behavior may have changed since<version>.

-Xno-forwarders
Do not generate static forwarders in mirror classes.

-Xno-patmat-analysis
Don't perform exhaustivity/unreachability analysis. Also, ignore @switch
annotation.

-Xno-uescape
Disable handling of \u unicode escapes

-Xnojline
Do not use JLine for editing.

-Xplugin:<paths>
Load a plugin from each classpath.

-Xplugin-disable:<plugin>
Disable plugins by name.

-Xplugin-list
Print a synopsis of loaded plugins.

-Xplugin-require:<plugin>
Abort if a named plugin is not loaded.

-Xpluginsdir <path>
Path to search for plugin archives.

-Xprint:<phases>
Print out program after <phases> (see below).

-Xprint-icode[:<phases>]
Log internal icode to *.icode files after<phases> (default: icode).

-Xprint-pos
Print tree positions, as offsets.

-Xprint-types
Print tree types (debugging option).

-Xprompt
Display a prompt after each error (debugging option).

-Xresident
Compiler stays resident, files to compile are read from standard input.

-Xscript <object>
Treat the source file as a script and wrap it in a main method.

-Xshow-class <class>
Show internal representation of class.

-Xshow-object <object>
Show internal representation of object.

-Xshow-phases
Print a synopsis of compiler phases.

-Xsource:<version>
Treat compiler input as Scala source for the specified version, see SI-8126.

-Xsource-reader <classname>
Specify a custom method for reading source files.

-Xstrict-inference
Don't infer known-unsound types.

-Xverify
Verify generic signatures in generated bytecode (asm backend only).

-Y Print a synopsis of private options.

Compilation Phases
parser parse source into ASTs, perform simple desugaring

namer resolve names, attach symbols to named trees

packageobjects
load package objects

typer the meat and potatoes: type the trees

patmat translate match expressions

superaccessors
add super accessors in traits and nested classes

extmethods
add extension methods for inline classes

pickler
serialize symbol tables

refchecks
reference/override checking, translate nested objects

selectiveanf
ANF pre-transform for @cps (CPS plugin)

selectivecps
@cps-driven transform of selectiveanf assignments (CPS plugin)

uncurry
uncurry, translate function values to anonymous classes

tailcalls
replace tail calls by jumps

specialize
@specialized-driven class and method specialization

explicitouter
this refs to outer pointers, translate patterns

erasure
erase types, add interfaces for traits

posterasure
clean up erased inline classes

lazyvals
allocate bitmaps, translate lazy vals into lazified defs

lambdalift
move nested functions to top level

constructors
move field definitions into constructors

flatten
eliminate inner classes

mixin mixin composition

cleanup
platform-specific cleanups, generate reflective calls

delambdafy
remove lambdas

icode generate portable intermediate code

inliner
optimization: do inlining

inlineHandlers
optimization: inline exception handlers

closelim
optimization: eliminate uncalled closures

constopt
optimization: optimize null and other constants

dce optimization: eliminate dead code

jvm generate JVM bytecode

terminal
the last phase in the compiler chain

all matches all phases

ENVIRONMENT

JAVACMD
Specify the java command to be used for running the Scala code. Arguments may be
specified as part of the environment variable; spaces, quotation marks, etc., will
be passed directly to the shell for expansion.

JAVA_HOME
Specify JDK/JRE home directory. This directory is used to locate the java command
unless JAVACMD variable set.

JAVA_OPTS
Specify the options to be passed to the java command defined by JAVACMD.

With Java 1.5 (or newer) one may for example configure the memory usage of the JVM
as follows: JAVA_OPTS="-Xmx512M -Xms16M -Xss16M"

With GNU Java one may configure the memory usage of the GIJ as follows:
JAVA_OPTS="--mx512m --ms16m"

EXAMPLES

Compile a Scala program to the current directory
scalac HelloWorld

Compile a Scala program to the destination directory classes
scalac -d classes HelloWorld.scala

Compile a Scala program using a user-defined java command
env JAVACMD=/usr/local/bin/cacao scalac -d classes HelloWorld.scala

Compile all Scala files found in the source directory src to the destination directory
classes
scalac -d classes src/*.scala

EXIT STATUS

scalac returns a zero exist status if it succeeds to compile the specified input files.
Non zero is returned in case of failure.

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