Nam H. Pham

Hi Cygwin friends and users,

after an exceptionally long time of development and testing we’re proud
to release Cygwin’s next major version 1.7.1.

This release is a big leap from the former Cygwin releases in a couple
of ways. For the full list we urge you to read the new User’s Guide,
which you can now find in the usual place:

http://cygwin.com/cygwin-ug-net/

There’s a “What’s new” section at

http://cygwin.com/cygwin-ug-net/ov-new1.7.html

The most important changes are:

- The mount table is no longer stored in the registry. Rather, it’s
stored in /etc/fstab and /etc/fstab/$USER. See
http://cygwin.com/cygwin-ug-net/using.html#mount-table

- Support for pathnames beyond the former 260 chars border. PATH_MAX
is now set to 4096, but Cygwin will try to support even longer paths
up to the Windows maxium of 32767 Unicode chars,

- Multiple Cygwin installations can co-exist on a machine, as long
as you keep them separate.

- Support for IPv6.

- Default character set is now UTF-8, but other character sets are
supported via an improved internationalization support. See
http://cygwin.com/cygwin-ug-net/setup-locale.html

- Support for new authentication methods which are supposed to improve
changing the user context without password.

- No more support for Windows 95, Windows 98 and Windows Me.

======================================================================
IMPORTANT NOTES for those who upgrade from an existing Cygwin 1.5.25
installation:

You *must* upgrade to the latest setup.exe from our main web page at
http://cygwin.com/

Moving the mount table from the registry to /etc/fstab works only
automatically for system mount points. User mount points have to be
taken care of manually, using the /usr/bin/copy-user-registry-fstab
script. See http://cygwin.com/cygwin-ug-net/using.html#mount-table
======================================================================

Have fun,
Corinna

Source: http://cygwin.com/ml/cygwin-announce/2009-12/msg00027.html

Comments: Frankly, I rarely used cygwin. Nevertheless, I find it handy recently when I want to use Perl & Unix commands. Even it’s not as convenient as in Linux, it’s small and enough for my needs. Moreover, I like the ideas creating an Unix environment inside Windows. It’s just like an idea of a wooden horse in Trojan War.

Way, after four hours reading, searching, andcoding, I finally understand how to use Eclipse C/C++ Development Tooling (CDT) to parse the C/C++ source code. In detail, it used the Document Object Model (DOM) to parse and update AST whenever there is a change in source file.

The reason I spent so much time solving this problem because of lack in APIs documentation and also I thought that the sample code using CDT is from old version (2.0) in which many APIs were deprecated.

Similar to JDT- the tool parse Java source code to build AST – CDT works in similar steps:

1. Create an IASTTranslationUnit instance
2. Overide abstract class ASTVisior
3. Traverse the IASTTranslationUnit using ASTVisior

Here are the sample code which works with Eclipse SDK 3.5.1 and CDT version 6.0.1:

Import:

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import org.eclipse.cdt.core.dom.ICodeReaderFactory;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.gnu.cpp.GPPLanguage;
import org.eclipse.cdt.core.parser.CodeReader;
import org.eclipse.cdt.core.parser.DefaultLogService;
import org.eclipse.cdt.core.parser.IParserLogService;
import org.eclipse.cdt.core.parser.IScannerInfo;
import org.eclipse.cdt.core.parser.ScannerInfo;

Main program:

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IParserLogService log = new DefaultLogService();
char[] code = readFile("C:\\grep.cpp");
CodeReader reader = new CodeReader(code);
Map definedSymbols = new HashMap();
String[] includePaths = new String[0];
IScannerInfo info = new ScannerInfo(definedSymbols, includePaths);
ICodeReaderFactory readerFactory = FileCodeReaderFactory.getInstance();
 
IASTTranslationUnit translationUnit = GPPLanguage.getDefault()
.getASTTranslationUnit(reader, info, readerFactory, null, log);
 
ASTVisitor visitor = new ImplASTVisitor();
translationUnit.accept(visitor);

Please note that I already override the ASTVisior class with my own one ImplASTVisitor:

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public class ImplASTVisitor extends ASTVisitor {
	public ImplASTVisitor(){
		super.shouldVisitNames = true;
		super.shouldVisitDeclarations = true;
		super.shouldVisitInitializers = true;
		super.shouldVisitParameterDeclarations = true;
		super.shouldVisitDeclarators = true;
		super.shouldVisitDeclSpecifiers = true;
		super.shouldVisitExpressions = true;
		super.shouldVisitStatements = true;
		super.shouldVisitTypeIds = true;
		super.shouldVisitEnumerators = true;
		super.shouldVisitTranslationUnit = true;
		super.shouldVisitProblems = true;
	}
 
	/**
	 * @return continue to continue visiting, abort to stop, skip to not descend
	 *         into this node.
	 */
	public final static int PROCESS_SKIP = 1;
	public final static int PROCESS_ABORT = 2;
	public final static int PROCESS_CONTINUE = 3;
	/**
	 *
	 * visit methods
	 *
	 */
	private void print(IASTNode node){
		System.out.println(node.getRawSignature());
	}
	public int visit(IASTTranslationUnit tu) {
		print(tu);
		return PROCESS_CONTINUE;
	}
	public int visit(IASTName name) {
		print(name);
		return PROCESS_CONTINUE;
	}
 
	public int visit(IASTDeclaration declaration) {
		print(declaration);
		return PROCESS_CONTINUE;
	}
       .....
}

I actually did not write all this portion of code. I read, understand and rewrite it based on the following sources:

• Thanks  Matthew Scarpino for this wonderful article: Building a CDT-based editor, Part 3: Basic CDT parsing

• Thanks Jason Montojo for this sample source code: Nabble

Matrix – one interesting animation project I leaded a four-person team. It was nominated the best animation project in the Virtual Reality class. I had wonderful experience working with my talented classmates. Please enjoy !

Youtube Link: http://www.youtube.com/watch?v=grZba-PLxBU