PATCH: truncated class handling

Patrick Tullmann tullmann at
Mon Apr 15 15:49:13 PDT 2002

I discovered the other day that Kaffe didn't correctly handle
truncated class files (it just segfaulted, and threw a null pointer
exception).  I figured this would be a relatively easy fix (just add
some buffer length checks in various places in readClass).

It wasn't.  The main culprit was kaffeh, which used its own bastarized
version of the readClass macros.  I bashed on kaffeh until it was able
to use the main kaffevm functions for reading classes, and took the
opportunity to clean up a bunch of other things in kaffeh (and some in

A completely unrelated hack to kaffe/scripts/ to automatically
figure out a unique name for KAFFE_DEBUG_TEMPFILE is also included.

The patch (92k) and a ChangeLog entry are available here:

I've attached the ChangeLog entry here.  I can check this in, but want
to know if I should check it in now, or if we should wait for after
the 1.0.7 release.   Other feedback or issues are welcomed, too.


----- ----- ---- ---  ---  --   -    -      -         -               -
Pat Tullmann                                       tullmann at
	      The early bird gets the worm, so sleep in.

Pat Tullmann <pat at>:
	* kaffe/kaffeh/mem.c, kaffe/kaffeh/,
	kaffe/kaffeh/kaffeh-support.h, kaffe/kaffeh/main.c,
	kaffe/kaffeh/sigs.c, kaffe/kaffeh/support.c,
	kaffe/kaffevm/, kaffe/kaffevm/baseClasses.c,
	kaffe/kaffevm/classMethod.c, kaffe/kaffevm/classMethod.h,
	kaffe/kaffevm/classpath.h, kaffe/kaffevm/code.c,
	kaffe/kaffevm/code.h, kaffe/kaffevm/constants.c,
	kaffe/kaffevm/constants.h, kaffe/kaffevm/exception.c,
	kaffe/kaffevm/file.h, kaffe/kaffevm/lookup.c,
	kaffe/kaffevm/readClass.c, kaffe/kaffevm/readClass.h,
	kaffe/kaffevm/support.c, kaffe/kaffevm/utf8const.c:
	Handle truncated classes in readClass.  Also took the
	opportunity to clean up some really ugly macros, and share
	more code between kaffevm and kaffeh.  Moved the buffer
	reading macros used by readClass() into inline functions with
	asserts.  Added many 'const' to various 'char *'.  Split
	kaffeh mem-related code into a new file.  kaffeh overrides
	various functions now, but does not override internal header
	files or macros.  Cleaned up the kaffeh java_lang_* headers.
	Add -Xdebug option to kaffeh, as kaffeh can now use the
	kaffevm debug.c infrastructure.  Moved class-specific constant
	table parsing macros into classMethod.h (out of constants.h).

	* kaffe/kaffeh/mem.c, kaffe/kaffevm/utfconst.h:
	Added as part of above.

	* kaffe/kaffeh/constants.c, kaffe/kaffeh/constants.h,
	* kaffe/kaffeh/file.h, kaffe/kaffeh/readClassConfig.h,
	* kaffe/kaffevm/readClassConfig.h: 
	Removed as part of above.

	* kaffe/kaffevm/debug.c,kaffe/kaffevm/debug.h:
	Added READCLASS flag to debug infrastructure.  dbgSetMaskStr()
	now takes a 'const char*'.  debug.h is usable in Kaffeh, so
	many hacks were removed.  Made GCC understand that
	kaffe_dprintf works just like printf, so it can debug the
	format strings (several debug format strings were fixed
	because of these valid warnings).

	* kaffe/kaffevm/findInJar.c, libraries/clib/native/ClassLoader.c
	Use the new file.h classFile interface, 

	* kaffe/kaffevm/utf8const.h, kaffe/kaffevm/string.c,
	To cleanly share the utf8 code between kaffeh and kaffevm,
	created kaffevm/utf8const.h which contains only the
	utf8-related functions, types and macros.

	* test/regression/,
	Added a new regression test that tests
	truncated classes.

	* kaffe/kaffevm/inflate.c, kaffe/kaffevm/jni.c,
	Minor comment changes and cleanups

	* kaffe/kaffevm/mem/gc-incremental.c,
	kaffe/kaffevm/mem/gc-mem.c, kaffe/kaffevm/mem/gc-mem.h:
	Added some asserts to the gc, and some more comments.  

	* kaffe/scripts/
	Try to automatically find a unique name for the

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