Name: tb29552 Date: 10/01/2001


(Submitted via email to ###@###.###)

Hi,

Although the HPROF source code is provided by Sun 'as-is' and is not subject
to support I thought you might want to know that the code provided from the
http://java.sun.com/j2se/1.3/docs/guide/jvmpi/jvmpi.html#hprof document at
the bottom (http://java.sun.com/j2se/1.3/docs/guide/jvmpi/hprof.zip) does
not run.

This code blows up with an 'out of memory' exception.

The problem is at line 149 in the hprof_class.c file

    hstatics = (hprof_field_t *) hprof_calloc(num_statics *
sizeof(hprof_field_t));


When the 'num_statics' value is zero the 'hprof_calloc' function calls
'malloc' with a size of 0 causing malloc to return NULL which causes
'hprof_calloc' to report an 'out of memory' exception.

This line of code (and others like it at line 148 and 156) should only be
called with non-zero values.

Thanks for providing the code, however. It is very useful in understanding
how the profiler interface works.


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