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From "Pavel Afremov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4982) [drlvm][gc_gen][jit][opt] Fix (improve) compressed references to support heaps up to 4Gb
Date Sun, 21 Oct 2007 11:21:50 GMT
[drlvm][gc_gen][jit][opt] Fix (improve) compressed references to support heaps up to 4Gb

                 Key: HARMONY-4982
                 URL: https://issues.apache.org/jira/browse/HARMONY-4982
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
         Environment: Linux x86-64 & Window x86-64
            Reporter: Pavel Afremov
            Priority: Critical

I tried to run DRL VM with heap size 3950 M bytes.

I changed line in GC_Gen to fix limitation which avoid usage of large heap. You can find changes
in attached patch.
After that DRL VM in JET mode works with large heap succesfully on both Linux x86-64 and Windows

I tried to run DRL VM in OPT mode. 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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