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Sun, 01 June 2008 17:48

hojtsy
Messages: 241
Registered: January 2006
Location: Budapest, Hungary

Experienced Member

I am using U++ 2008.1beta2 with the embedded MinGW 4.3.0 on WinXp sp2.
I think I have found a code generation bug in MinGW for this code:

#include <Core/Core.h>

struct Test
{
	Test() { Upp::Cout() << "Test::Test()\n"; }
	~Test() { Upp::Cout() << "Test::~Test()\n"; }
};

struct Worker
{
	Worker * Fn1()
	{
		bool throwException = false;
		bool enterLoop = true;
		for(Test t; enterLoop;)
		{
			if(throwException) throw int(3);
			Upp::Cout() << "returning this = " << (void *) this << "\n";
			return this;
		}
	}

	int i;
};

CONSOLE_APP_MAIN
{
	Worker w;
	Upp::Cout() << "&w = " << (const void *) &w << "\n";
	Worker *w2 = w.Fn1();
	Upp::Cout() << "received = " << (const void *) w2 << "\n";
}

output is below. Notice that Fn1 incorrectly returns the null pointer. Both the non-invoked throw and the loop is important: if I remove any of them, the bug doesn't occur. Am I missing something? Wouldn't is be good idea to revert the included MinGW to a stable version?

&w = 0x12FF40
Test::Test()
returning this = 0x12FF40
Test::~Test()
received = 0x0

- hojtsy

[Updated on: Sun, 01 June 2008 18:00]

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