Tom Rodriguez wrote: > Someone wrote: > > openjdk builds on hppa, but doesn't run (yet). Andrew Haley once > > debugged it and found out at least one things which would need to > > be fixed: the assumption in the C++ interpreter that the stack > > always grows downwards, and not upwards as on hppa. > > > > please could one of the hotspot developers sched some light on > > this, how easy this might to be fix, and if there are other > > assumptions? > > Could you give more detail on where exactly the direction of growth > is being assumed? I know there's an accessor in frame that's > supposed to describe the direction of growth of the expression stack > which is used a few places in the code: > > // expression stack (may go up or down, direction == 1 or -1) > public: > intptr_t* interpreter_frame_expression_stack() const; > static jint interpreter_frame_expression_stack_direction(); > > I would think this has to be set correctly for HPPA to work. Is it? > It's possible that the C++ interpreter would also need to consult > this when pushing values for it to work correctly.
I'm not 100% sure what the correct value of this would be for HPPA. The ABI stack grows upwards, but the stack Zero maintains still grows downwards. If interpreter_frame_expression_stack_direction is used for both of these stacks then something will need changing (either a separate accessor, or Zero's stack direction changing to match the ABI stack.) Cheers, Gary -- http://gbenson.net/ -- To UNSUBSCRIBE, email to debian-java-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
