Currently bytecode dumping has some code to print the state of StructureStubInfo's, but that code has rotted, and is does not provide very many details - for example it will not tell you the offsets that we are using, and it will not tell you the full chains (for prototype accesses) or lists (for polymorphic accesses) being used. As well, the old dumping code prints structure stub information out-of-line, which makes it a bit harder to grok. The old code (which is rotten) should be axed, and replaced by something more informative. Finally, it should be possible for the DFG to dump bytecode during parsing, so that we can see exactly what the DFG sees when making its optimization decisions.
Created attachment 139545 [details] the patch
Comment on attachment 139545 [details] the patch Attachment 139545 [details] did not pass gtk-ews (gtk): Output: http://queues.webkit.org/results/12597247
Comment on attachment 139545 [details] the patch Attachment 139545 [details] did not pass win-ews (win): Output: http://queues.webkit.org/results/12592402
Comment on attachment 139545 [details] the patch Attachment 139545 [details] did not pass qt-ews (qt): Output: http://queues.webkit.org/results/12593390
Comment on attachment 139545 [details] the patch Attachment 139545 [details] did not pass qt-wk2-ews (qt): Output: http://queues.webkit.org/results/12582472
Landed (with build fixes) in http://trac.webkit.org/changeset/115694
Created attachment 143111 [details] patch for landing
Merged in http://trac.webkit.org/changeset/117823