longjmp crashes on Windows

[Maxim Fomin]

On Saturday, 16 November 2013 at 14:14:24 UTC, Piotr Podsiadły 
wrote:
> Hello,
>
> I'm trying to use setjmp and longjmp on Windows with DMD 
> compiler (version 2.064). When compiled as 64-bit application, 
> it works, but 32-bit version crashes inside longjmp. What 
> should be changed to get it to work?
>
> I tried changing value of _JBLEN for x86 to some bigger number 
> (like 1024), but it crashes too.
>
> Code:
>
> import std.stdio;
>
> version(Windows)
> {
> 	version(X86)
> 		enum _JBLEN = 64;
> 	else version(X86_64)
> 		enum _JBLEN = 256;
> 	else version(IA64)
> 		enum _JBLEN = 528;
> 	
> 	alias ubyte[_JBLEN] jmp_buf;
>
> 	extern(C)
> 	{
> 		int _setjmp(ref jmp_buf _Buf);
> 		void longjmp(ref jmp_buf _Buf, int _Value);
> 	}
> 	
> 	alias _setjmp setjmp;
> }

What kind of problem you try to solve by manual defining system 
data structures? Why not use platform independent valid 
declarations? Why did you decide that _JBLEN is 64, 256, 528 
according to version? Why did you decide that having _JBLEN bytes 
filled with zeros is a valid value of jmp_buf object? Why should 
setjmp/longjmp take buffer by reference?

> void main()
> {
> 	jmp_buf env;
> 	uint i;
> 	if(setjmp(env) < 3)
> 	{
> 		writeln("ping");
> 		longjmp(env, ++i);
> 	}
> 	writeln("done");
> }
>
> Call stack:
>
> c:\Users\vbox\Documents\test>test.exe
> ping
> object.Error: Access Violation
> ----------------
> 0x00423F78 in _local_unwind
> 0x004214D0 in longjmp
> 0x0040B300 in void rt.dmain2._d_run_main(int, char**, extern 
> (C) int function(char[][])*).runAll().void __lambda1()
> 0x0040B2D3 in void rt.dmain2._d_run_main(int, char**, extern 
> (C) int function(char[][])*).runAll()
> 0x0040B1EB in _d_run_main
> 0x0040B018 in main
> 0x0042142D in mainCRTStartup
> 0x754F3677 in BaseThreadInitThunk
> 0x77959F42 in RtlInitializeExceptionChain
> 0x77959F15 in RtlInitializeExceptionChain
> ----------------

Try to use proper version of setjmp/jmp_buf from druntime.
By the way, why did you decide to use it in D language in a first 
place?