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From "Pavel Afremov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4991) [jit] Fix compressed references support for heaps up to 4Gb
Date Mon, 22 Oct 2007 11:08:50 GMT
[jit] Fix compressed references support for heaps up to 4Gb

                 Key: HARMONY-4991
                 URL: https://issues.apache.org/jira/browse/HARMONY-4991
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
         Environment: Linux x86-64 & Windows x86-64
            Reporter: Pavel Afremov
            Priority: Critical

I tried to run DRL VM in OPT mode with patch from HARMONY-4982 . The result is sigsegv in
jited code. 

at java.lang.AbstractStringBuilder.append0() 
    (Ln 168, ...\classlib\modules\luni\src\main\java\java\lang\AbstractStringBuilder.java
" if (newSize > value.length) {") 
at HeapTest.func() 
    (Ln 15, .\HeapTest.java " System.out.println("iteration " + i);") 
at HeapTest.main() 
    (Ln 6, .\HeapTest.java " test.func();") 

The source of it is incorrect signed extension of 32 bit value to 64 bit register (marked
by red in attached assembly code). 

0000000005967D47 mov eax,dword ptr [rbx+8] 
0000000005967D4A movsxd rax,eax 
0000000005967D4D mov rsi,7FFF0000h 
0000000005967D57 mov r12,rax 
0000000005967D5A add r12,rsi 
0000000005967D5D mov qword ptr [rsp],r12 
0000000005967D61 mov rax,7FFF0000h 
0000000005967D6B cmp r12,rax 
0000000005967D6E je 0000000005967E05 

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