Crash with "assert(number_of_codes <= 256) failed: too many bytecodes"

Tobias Hartmann tobias.hartmann at oracle.com
Thu Jul 27 16:08:50 UTC 2017


On 27.07.2017 17:58, Maurizio Cimadamore wrote:
> Wait - if you update these opcodes, then we need to update bytecode library as well - see
> 
> jdk.experimental.bytecode.Opcode

Right:

diff -r 2e4c9a8ae4e3 src/java.base/share/classes/jdk/experimental/bytecode/Opcode.java
--- a/src/java.base/share/classes/jdk/experimental/bytecode/Opcode.java	Thu Jul 27 15:59:25 2017 +0100
+++ b/src/java.base/share/classes/jdk/experimental/bytecode/Opcode.java	Thu Jul 27 18:07:52 2017 +0200
@@ -235,14 +235,11 @@
     VSTORE(204),
     VALOAD(205),
     VASTORE(206),
-    VNEW(207),
-    VRETURN(210),
-    VGETFIELD(211),
-    TYPED(212),
-    VDEFAULT(214),
-    VWITHFIELD(215),
-    VBOX(216),
-    VUNBOX(217);
+    VRETURN(207),
+    VDEFAULT(208),
+    VWITHFIELD(209),
+    VBOX(210),
+    VUNBOX(211);
 
     int code;


And I guess we have to change this as well:

diff -r 298730c35452 src/jdk.jdeps/share/classes/com/sun/tools/classfile/Opcode.java
--- a/src/jdk.jdeps/share/classes/com/sun/tools/classfile/Opcode.java	Thu Jul 27 16:00:29 2017 +0100
+++ b/src/jdk.jdeps/share/classes/com/sun/tools/classfile/Opcode.java	Thu Jul 27 18:08:20 2017 +0200
@@ -247,13 +247,13 @@
     VSTORE(204, LOCAL),
     VALOAD(205),
     VASTORE(206),
-    VRETURN(210),
+    VRETURN(207),
 
-    VDEFAULT(214, CPREF_W),
-    VWITHFIELD(215, CPREF_W),
+    VDEFAULT(208, CPREF_W),
+    VWITHFIELD(209, CPREF_W),
 
-    VBOX(216, CPREF_W),
-    VUNBOX(217, CPREF_W),
+    VBOX(210, CPREF_W),
+    VUNBOX(211, CPREF_W),
 
     // impdep 0xfe: PicoJava nonpriv
     // impdep 0xff: Picojava priv


Thanks,
Tobias

> On 27/07/17 16:31, Tobias Hartmann wrote:
>> Hi,
>>
>> seems like this is due to:
>> http://hg.openjdk.java.net/valhalla/valhalla/hotspot/rev/dbb31857c4d4
>>
>> If I count correctly, adding _vgetfield at the end 'causes number_of_codes' to be 257 and thus we fail.
>>
>> We should reset the value type bytecode numbers:
>>
>> diff -r 5cd8d5559192 src/share/vm/interpreter/bytecodes.hpp
>> --- a/src/share/vm/interpreter/bytecodes.hpp    Thu Jul 27 16:00:00 2017 +0100
>> +++ b/src/share/vm/interpreter/bytecodes.hpp    Thu Jul 27 17:23:40 2017 +0200
>> @@ -248,11 +248,11 @@
>>       _vstore               = 204, // 0xcc
>>       _vaload               = 205, // 0xcd
>>       _vastore              = 206, // 0xce
>> -    _vreturn              = 210, // 0xd2
>> -    _vdefault             = 214, // 0xd6
>> -    _vwithfield           = 215, // 0xd7
>> -    _vbox                 = 216, // 0xd6
>> -    _vunbox               = 217, // 0xd7
>> +    _vreturn              = 207, // 0xcf
>> +    _vdefault             = 208, // 0xd0
>> +    _vwithfield           = 209, // 0xd1
>> +    _vbox                 = 210, // 0xd2
>> +    _vunbox               = 211, // 0xd3
>>         number_of_java_codes,
>>
>> Thanks,
>> Tobias
> 


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