>Number: 10878
>Category: java
>Synopsis: miscompilation of boolean parameters from bytecode
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue May 20 08:16:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: [email protected]
>Release: 3.2.2
>Organization:
>Environment:
mingw, linux
>Description:
Boolean parameter will be misinterpreted when compiled from bytecode rather than from java source.
See in assembly (when compiled without any optimizations):
movb %al, -1(%ebp)
then referencing the variable:
movl -8(%ebp), %edx
>How-To-Repeat:
Compile the java source to bytecode, then compile it with gcj to produce assembly listing. Watch for the parameter representation of the boolean variable in the stack.
>Fix:
Compile from java source OR avoid booleans (use ints instead). Note: java bytecode treats booleans as ints already. They shouldn't be treaten like booleans, unless you want packed boolean arrays, which occurs very very rarely.
>Release-Note:
>Audit-Trail:
>Unformatted:
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