[9] RFR(S): 8148752: Compiled StringBuilder code throws StringIndexOutOfBoundsException

Tobias Hartmann tobias.hartmann at oracle.com
Tue Feb 9 12:01:21 UTC 2016


please review the following patch.


GraphBuilder::try_method_handle_inline() handles long and double arguments incorrectly when casting them to their actual type. Long/double arguments occupy two slots (see Parse::do_get_xxx() -> push_pair()). Currently, these two slots are treated as two individual arguments, causing incorrect casting of arguments.

In this case, an Object argument is casted to String and therefore being used as a String (although it's actually of type 'ResolvedJavaMethod'). We later fail by throwing exceptions in compiled code. For a detailed evaluation see my comments in the bug [1].

We should handle this like C1 does in GraphBuilder::try_method_handle_inline().


[1] https://bugs.openjdk.java.net/browse/JDK-8148752?focusedCommentId=13896557&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13896557

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