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gcj.texi: Add chapter about system properties.

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* gcj.texi: Add chapter about system properties.
       Fixed some typos.

From-SVN: r56740
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Mark Wielaard 2002-09-02 15:36:07 +00:00 committed by Mark Wielaard
parent 603f86d7db
commit f60518c8de
2 changed files with 245 additions and 9 deletions
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gcc/java/ChangeLog
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@ -1,3 +1,8 @@
2002-09-01 Mark Wielaard <mark@klomp.org>
* gcj.texi: Add chapter about system properties.
Fixed some typos.
2002-08-26 Tom Tromey <tromey@redhat.com>
* parse.y (try_builtin_assignconv): Allow narrowing primitive

249
gcc/java/gcj.texi
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@ -130,6 +130,7 @@ files and object files, and it can read both Java source code and
* Invoking rmic:: Generate stubs for Remote Method Invocation.
* Invoking rmiregistry:: The remote object registry.
* About CNI:: Description of the Cygnus Native Interface
* System properties:: Modifying runtime behavior of the libgcj library
* Resources:: Where to look for more information
@end menu
@ -282,7 +283,7 @@ If @code{--bootclasspath} was specified, append its value.
Otherwise, append the built-in system directory, @file{libgcj.jar}.
@item
Finaly, if @code{--extdirs} was specified, append the contents of the
Finally, if @code{--extdirs} was specified, append the contents of the
specified directories at the end of the class path. Otherwise, append
the contents of the built-in extdirs at @code{$(prefix)/share/java/ext}.
@end itemize
@ -428,7 +429,7 @@ using JNI, then you must use @code{-fjni}. This option causes
methods.
@item -fno-optimize-static-class-initialization
When the optimization level is greather or equal to @code{-O2},
When the optimization level is greater or equal to @code{-O2},
@command{gcj} will try to optimize the way calls into the runtime are made
to initialize static classes upon their first use (this optimization
isn't carried out if @code{-C} was specified.) When compiling to native
@ -687,7 +688,7 @@ and the Info entries for @file{gcj} and @file{gcc}.
@c man begin DESCRIPTION jcf-dump
This is a class file examiner, similar to @code{javap}. It will print
information about a number of classes, which are specifed by class name
information about a number of classes, which are specified by class name
or file name.
@c man end
@ -1108,7 +1109,7 @@ class java::lang::String : public java::lang::Object
@};
@end example
@noindent The @code{gcjh} tool automatically generates the nessary namespace
@noindent The @code{gcjh} tool automatically generates the necessary namespace
declarations.
@ -1150,7 +1151,7 @@ import @var{package-name}.*;
@end example
@noindent Doing this allows any class from the package @var{package-name} to be
refered to only by its class-name within the program text.
referred to only by its class-name within the program text.
@noindent The same effect can be achieved in C++ like this:
@ -1182,7 +1183,7 @@ so CNI provides a special C++ type for each primitive Java type:
@item @code{void} @tab @code{void} @tab no value
@end multitable
When refering to a Java type You should always use these C++ typenames (e.g.: @code{jint})
When referring to a Java type You should always use these C++ typenames (e.g.: @code{jint})
to avoid disappointment.
@ -1580,7 +1581,7 @@ java::lang:Integer::doubleValue()
@subsection Interface methods
In Java you can call a method using an interface reference. This is
supported, but not completly. @xref{Interfaces}.
supported, but not completely. @xref{Interfaces}.
@ -1824,8 +1825,8 @@ the @code{synchronized} attribute is handled by the
method implementation, it is up to the programmer
of a synchronized native method to handle the synchronization
(in the C++ implementation of the method).
In otherwords, you need to manually add @code{JvSynchronize}
in a @code{native synchornized} method.
In other words, you need to manually add @code{JvSynchronize}
in a @code{native synchronized} method.
@node Invocation
@section Invocation
@ -1945,6 +1946,236 @@ are as in JNI@.
@noindent will be added shortly, as will other functions corresponding to JNI@.
@node System properties
@chapter System properties
The runtime behavior of the @code{libgcj} library can be modified by setting
certain system properties. These properties can be compiled into the program
using the @code{-D@var{name}[=@var{value}]} option to @command{gcj} or by
setting them explicitly in the program by calling the
@code{java.lang.System.setProperty()} method. Some system properties are only
used for informational purposes (like giving a version number or a user name).
A program can inspect the current value of a property by calling the
@code{java.lang.System.getProperty()} method.
@menu
* Standard Properties:: Standard properties supported by @code{libgcj}
* GNU Classpath Properties:: Properties found in Classpath based libraries
* libgcj Runtime Properties:: Properties specific to @code{libgcj}
@end menu
@node Standard Properties
@section Standard Properties
The following properties are normally found in all implementations of the core
libraries for the Java language.
@table @gcctabopt
@item java.version
The @code{libgcj} version number.
@item java.vendor
Set to @samp{The Free Software Foundation, Inc.}
@item java.vendor.url
Set to @uref{http://gcc.gnu.org/java/}.
@item java.home
The directory where @code{gcj} was installed. Taken from the @code{--prefix}
option given to @command{configure}.
@item java.class.version
The class format version number supported by the libgcj byte code interpreter.
(Currently @samp{46.0})
@item java.vm.specification.version
The Virtual Machine Specification version implemented by @code{libgcj}.
(Currently @samp{1.0})
@item java.vm.specification.vendor
The name of the Virtual Machine specification designer.
@item java.vm.specification.name
The name of the Virtual Machine specification
(Set to @samp{Java Virtual Machine Specification}).
@item java.vm.version
The @command{gcj} version number.
@item java.vm.vendor
Set to @samp{The Free Software Foundation, Inc.}
@item java.vm.name
Set to @samp{GNU libgcj}.
@item java.specification.version
The Runtime Environment specification version implemented by @code{libgcj}.
(Currently set to @samp{1.3})
@item java.specification.vendor
The Runtime Environment specification designer.
@item java.specification.name
The name of the Runtime Environment specification
(Set to @samp{Java Platform API Specification}).
@item java.class.path
The paths (jar files, zip files and directories) used for finding class files.
@item java.library.path
Directory path used for finding native libraries. Currently not set.
@item java.io.tmpdir
The directory used to put temporary files in.
@item java.compiler
Name of the Just In Time compiler to use by the byte code interpreter.
Currently not used in @code{libgcj}.
@item java.ext.dirs
Directories containing jar files with extra libraries. Will be used when
resolving classes. Currently not used in @code{libgcj}.
@item java.protocol.handler.pkgs
A @samp{|} separated list of package names that is used to find classes that
implement handlers for @code{java.net.URL}.
@item java.rmi.server.codebase
A list of URLs that is used by the @code{java.rmi.server.RMIClassLoader}
to load classes from.
@item jdbc.drivers
A list of class names that will be loaded by the @code{java.sql.DriverManager}
when it starts up.
@item file.separator
The separator used in when directories are included in a filename
(normally @samp{/} or @samp{\} ).
@item file.encoding
The default character encoding used when converting platform native files to
Unicode (usually set to @samp{8859_1}).
@item path.separator
The standard separator used when a string contains multiple paths
(normally @samp{:} or @samp{;}), the string is usually not a valid character
to use in normal directory names.)
@item line.separator
The default line separator used on the platform (normally @samp{\n}, @samp{\r}
or a combination of those two characters).
@item policy.provider
The class name used for the default policy provider returned by
@code{java.security.Policy.getPolicy}.
@item user.name
The name of the user running the program. Can be the full name, the login name
or empty if unknown.
@item user.home
The default directory to put user specific files in.
@item user.dir
The current working directory from which the program was started.
@item user.language
The default language as used by the @code{java.util.Locale} class.
@item user.region
The default region as used by the @code{java.util.Local} class.
@item user.variant
The default variant of the language and region local used.
@item user.timezone
The default timezone as used by the @code{java.util.TimeZone} class.
@item os.name
The operating system/kernel name that the program runs on.
@item os.arch
The hardware that we are running on.
@item os.version
The version number of the operating system/kernel.
@item awt.appletWarning
The string to display when an untrusted applet is displayed.
Returned by @code{java.awt.Window.getWarningString()} when the window is
``insecure''.
@item awt.toolkit
The class name used for initializing the default @code{java.awt.Toolkit}.
Defaults to @code{gnu.java.awt.peer.gtk.GtkToolkit}.
@end table
@node GNU Classpath Properties
@section GNU Classpath Properties
@code{libgcj} is based on the GNU Classpath (Essential Libraries for Java) a
GNU project to create free core class libraries for use with virtual machines
and compilers for the Java language. The following properties are common to
libraries based on GNU Classpath.
@table @gcctabopt
@item gcj.dumpobject
Enables printing serialization debugging by the @code{java.io.ObjectInput} and
@code{java.io.ObjectOutput} classes when set to something else then the empty
string. Only used when running a debug build of the library.
@end table
@node libgcj Runtime Properties
@section libgcj Runtime Properties
The following properties are specific to the @code{libgcj} runtime and will
normally not be found in other core libraries for the java language.
@table @gcctabopt
@item java.fullversion
The combination of @code{java.vm.name} and @code{java.vm.version}.
@item java.vm.info
Same as @code{java.fullversion}.
@item impl.prefix
Used by the @code{java.net.DatagramSocket} class when set to something else
then the empty string. When set all newly created @code{DatagramSocket}s will
try to load a class @code{java.net.[impl.prefix]DatagramSocketImpl} instead of
the normal @code{java.net.PlainDatagramSocketImpl}.
@item gnu.gcj.runtime.NameFinder.demangle
Whether names in a stack trace should be demangled. Defaults to @code{true}.
@item gnu.gcj.runtime.NameFinder.sanitize
Whether calls to initialize exceptions and starting the runtime system
should be removed from the stack trace. Only done when names are
demangled. Defaults to @code{true}.
@item gnu.gcj.runtime.NameFinder.remove_unknown
Whether calls to unknown functions (class and method names are unknown)
should be removed from the stack trace. Only done when the stack is
sanitized. Ignored if this means no stack trace information would be
available anymore. Defaults to @code{true}.
@item gnu.gcj.runtime.NameFinder.remove_interpreter
Whether runtime interpreter calls (methods in the @code{_Jv_InterpMethod} class
and functions starting with @samp{ffi_}) should be removed from the stack
trace. Only done when the stack is sanitized. Defaults to @code{true}.
@item gnu.gcj.runtime.NameFinder.use_addr2line
Whether an external process (@command{addr2line} or @command{addr2name.awk})
should be used as fallback to convert the addresses to function names when
the runtime is unable to do it through @code{dladdr}.
@end table
@node Resources
@chapter Resources