Exception handling is broken for delegates on Linux

mclysenk at mtu.edu mclysenk at mtu.edu
Wed May 10 18:00:14 PDT 2006


As of version 0.150, the offsets of the code within a delegate's function
handler are not correctly calculated.  All of them seem to be set relative to
the address of the first delegate declared within the scope.  This results in
the following code breaking.  The windows version does not have this problem.

#class Tester
#{
#	this(void delegate() dg_) { dg = dg_; }
#	void delegate() dg;
#	void stuff() { dg(); }
#}
#
#unittest
#{
#	writefln("Starting test");
#
#	int a = 0;
#	int b = 0;
#	int c = 0;
#	int d = 0;
#
#	try
#	{
#		a++;
#		throw new Exception("test1");
#		a++;
#	}
#	catch(Exception e)
#	{
#		e.print;
#		b++;
#	}
#	finally
#	{
#		c++;
#	}
#
#	writefln("initial test.");
#
#	assert(a == 1);
#	assert(b == 1);
#	assert(c == 1);
#
#	writefln("pass");
#
#	Tester t = new Tester(
#	delegate void()
#	{
#		try
#		{
#			a++;
#			throw new Exception("test2");
#			a++;
#		}
#		catch(Exception e)
#		{
#			b++;
#			throw e;
#			b++;
#		}
#	});
#
#	try
#	{
#		c++;
#		t.stuff();
#		c++;
#	}
#	catch(Exception e)
#	{
#		d++;
#		e.print;
#	}
#
#	assert(a == 2);
#	assert(b == 2);
#	assert(c == 2);
#	assert(d == 1);
#
#
#	int q0 = 0;
#	int q1 = 0;
#	int q2 = 0;
#	int q3 = 0;
#	
#	Tester t2 = new Tester(
#	delegate void()
#	{
#		try
#		{
#			q0++;
#			throw new Exception("test3");
#			q0++;
#		}
#		catch(Exception e)
#		{
#			writefln("Never called.");
#			q1++;
#			throw e;
#			q1++;
#		}
#	});
#
#	try
#	{
#		q2++;
#		t2.stuff();
#		q2++;
#	}
#	catch(Exception e)
#	{
#		q3++;
#		e.print();
#	}
#
#	assert(q0 == 1);
#	assert(q1 == 1);
#	assert(q2 == 1);
#	assert(q3 == 1);
#
#	writefln("Passed!");
#}

The catch block in the second delegate never gets invoked.  On a Linux machine.
My output is as follows:

Starting test
test1
initial test.
pass
test2
test3
Error: AssertError Failure test(117)

While on windows, it passes with:

Starting test
test1
initial test.
pass
test2
Never called.
test3
Passed!


-Mik





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