Description Ryan Prichard 2004-01-11 01:36:06 EST

The CDT parser hangs on certain code involving for statements.  A sample piece
of code which causes a hang is provided below.  I have reproduced the hang with
the sample code on Eclipse 2.1.1 with CDT 1.2, and Eclipse 3.0M5 with CDT 2.0.

From my reading of the source code, the CDT parser handles the init segment of a
for statement by first treating it as a declaration, and if this fails, as an
expression.  With the sample code, the init statement is not a declaration. 
However, the CDT parser appears to process it without error, as a declaration.  

If the code in question were "for (a = 1, b = 2;;);", the CDT parser appears to
treat "a = 1, b = 2" not as an expression but as a declaration of two variables
of type "a".  The first variable has no name and is assigned to 1, and the
second variable has the name "b" and is assigned to 2.  I don't know that this
behavior causes the sample code below to hang the parser, but it seems likely.

Sample code:

int foo()
{
	int one;
	int two;
	
	for (one = 1, two = 2; 0;;);

	{
		int three;

		for (three = 3, two = 4; 0;;);
		for (two = 5; 0;;);
	
		return two + two;
	}
}