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Date: Tue, 20 May 2003 08:16:00 -0000
From: szabo.daniel@dpg.hu
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Subject: java/10878: miscompilation of boolean parameters from bytecode
X-SW-Source: 2003-05/txt/msg02152.txt.bz2
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>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:     szabo.daniel@dpg.hu
>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: