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Re: RFA: libjava seems to miss some files for win32
On 07/19/2009 02:29 PM, Dave Korn wrote:
> Kai Tietz wrote:
>> There are a lot of issues about casting HANDLE values into jint types,
>> which is for x86 valid, but for x64 can lead potential to pointer
>> truncations. Those part need some review by libjava maintainers. My
>> patch simply casts those kind of pointers via __UINTPTR_TYPE__ into
>> integer scalar before casting it into jint. I put comments at those
>> places, where some rework is necessary.
> Argh. You're replacing a bunch of warnings that draw attention to a real
> problem by a bunch of silent fixmes in the code. That's a bit scary to me.
Me too. That patch will not be accepted.
>> Index: gcc/libjava/gnu/java/net/natPlainSocketImplWin32.cc
>> --- gcc.orig/libjava/gnu/java/net/natPlainSocketImplWin32.cc 2009-07-19 12:06:54.200476000 +0200
>> +++ gcc/libjava/gnu/java/net/natPlainSocketImplWin32.cc 2009-07-19 12:13:45.727476500 +0200
>> @@ -58,7 +58,8 @@
>> // We use native_fd in place of fd here. From leaving fd null we avoid
>> // the double close problem in FileDescriptor.finalize.
>> - native_fd = (jint) hSocket;
>> + // Fixme, it isn't correct to cast a HANDLE to integer scalar here for x64
>> + native_fd = (jint) (__UINTPTR_TYPE__) hSocket;
> Question is, can we change the sizes of the members of class objects, such
> as gnu::java::net::PlainSocketImpl::native_fd, or do these objects and their
> layout form part of an ABI, and/or do they ever get serialised? The Java guys
> will be able to tell us.
Yes, you can change them. Yes, they are part of an ABI. native_fd should be