Short Question - About javac.c where is it?

[mr rupplin]

In building the OpenJDK where may we find the source code file(s) for the javac 
output?

In libjli we find the java.c but locate javac.c returns no results.  How 
curious.

Would you be a friend and help us out.  We love reading.

Thanks,

Max

/sr software developer

Re: Short Question - About javac.c where is it?

[Erik Joelsson]

Hello Max,

Javac, like most of the command line tools in the JDK is written in 
Java, so to look at the actual program, I would recommend starting here 
(assuming current mainline at http://hg.openjdk.java.net/jdk/jdk):


src/jdk.compiler/share/classes/com/sun/tools/javac/Main.java

Most of the executables in the JDK are built from the same launcher src 
file with some different -D macro flags set to control which java class 
gets invoked by that launcher. The source for the launchers is located here:


src/java.base/share/native/launcher/main.c

Does that answer your question?

/Erik


On 2018-07-20 15:31, mr rupplin wrote:

In building the OpenJDK where may we find the source code file(s) for the javac 
output?

In libjli we find the java.c but locate javac.c returns no results.  How 
curious.

Would you be a friend and help us out.  We love reading.

Thanks,

Max

/sr software developer

Re: Short Question - About javac.c where is it?

[mr rupplin]

Hello.

I look and find that we start here:

http://hg.openjdk.java.net/jdk/jdk/file/b0fcf59be391/src/jdk.compiler/share/classes/com/sun/tools/javac/main/Main.java

public Result compile(String[] argv, Context context)

and this leads to:

http://hg.openjdk.java.net/jdk/jdk/file/b0fcf59be391/src/jdk.compiler/share/classes/com/sun/tools/javac/main/JavaCompiler.java

comp.compile(args.getFileObjects(), args.getClassNames(), null, List.nil());


Which leads to genCode:

http://hg.openjdk.java.net/jdk/jdk/file/b0fcf59be391/src/jdk.compiler/share/classes/com/sun/tools/javac/main/JavaCompiler.java

 JavaFileObject genCode(Env env, JCClassDecl cdef) throws 
IOException

Which calls:


return writer.writeClass(cdef.sym);

And so I think if I've understood you (without a debugger running on this end) 
the JavaCompiler (in Java) will do a C compile on various C source code 
documents and share libraries and this will make the native binary "javac".  Is 
that correct?

The file "javac" is a native binary that is produced with a JavaCompiler called 
from the "bash configure && make all" command?

Thanks!

😊 MR/

From: Erik Joelsson 
Sent: Friday, July 20, 2018 6:56 PM
To: mr rupplin; build-dev@openjdk.java.net
Subject: Re: Short Question - About javac.c where is it?

Hello Max,

Javac, like most of the command line tools in the JDK is written in
Java, so to look at the actual program, I would recommend starting here
(assuming current mainline at http://hg.openjdk.java.net/jdk/jdk):

src/jdk.compiler/share/classes/com/sun/tools/javac/Main.java

Most of the executables in the JDK are built from the same launcher src
file with some different -D macro flags set to control which java class
gets invoked by that launcher. The source for the launchers is located here:

src/java.base/share/native/launcher/main.c

Does that answer your question?

/Erik


On 2018-07-20 15:31, mr rupplin wrote:
> In building the OpenJDK where may we find the source code file(s) for the 
> javac output?
>
> In libjli we find the java.c but locate javac.c returns no results.  How 
> curious.
>
> Would you be a friend and help us out.  We love reading.
>
> Thanks,
>
> Max
>
> /sr software developer