int AbstractInterpreter::BasicType_as_index(BasicType type) { int i = 0; switch (type) { case T_VOID : i = 0; break; case T_BOOLEAN: i = 1; break; case T_CHAR : i = 2; break; case T_BYTE : i = 3; break; case T_SHORT : i = 4; break; case T_INT : i = 5; break; case T_OBJECT : // fall through case T_ARRAY : i = 6; break; case T_LONG : i = 7; break; case T_FLOAT : i = 8; break; case T_DOUBLE : i = 9; break; default : ShouldNotReachHere();
}
assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds"); return i;
}
// How much stack a method activation needs in words. int AbstractInterpreter::size_top_interpreter_activation(Method* method) { constint stub_code = 12; // see generate_call_stub // Save space for one monitor to get into the interpreted method in case // the method is synchronized int monitor_size = method->is_synchronized() ? 1*frame::interpreter_frame_monitor_size() : 0;
// total overhead size: monitor_size + (sender SP, thru expr stack bottom). // be sure to change this if you add/subtract anything to/from the overhead area constint overhead_size = monitor_size +
(frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset); constint method_stack = (method->max_locals() + method->max_stack()) *
Interpreter::stackElementWords; return overhead_size + method_stack + stub_code;
}
// asm based interpreter deoptimization helpers int AbstractInterpreter::size_activation(int max_stack, int tempcount, int extra_args, int moncount, int callee_param_count, int callee_locals, bool is_top_frame) { // Note: This calculation must exactly parallel the frame setup // in TemplateInterpreterGenerator::generate_fixed_frame. // fixed size of an interpreter frame: int overhead = frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset;
// Our locals were accounted for by the caller (or last_frame_adjust on the transition) // Since the callee parameters already account for the callee's params we only need to account for // the extra locals.
void AbstractInterpreter::layout_activation(Method* method, int tempcount, int popframe_extra_args, int moncount, int caller_actual_parameters, int callee_param_count, int callee_locals,
frame* caller,
frame* interpreter_frame, bool is_top_frame, bool is_bottom_frame) {
// Set up the method, locals, and monitors. // The frame interpreter_frame is guaranteed to be the right size, // as determined by a previous call to the size_activation() method. // It is also guaranteed to be walkable even though it is in a skeletal state // NOTE: return size is in words not bytes
// fixed size of an interpreter frame: int max_locals = method->max_locals() * Interpreter::stackElementWords; int extra_locals = (method->max_locals() - method->size_of_parameters()) * Interpreter::stackElementWords;
#ifdef ASSERT
assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable"); #endif
interpreter_frame->interpreter_frame_set_method(method); // NOTE the difference in using sender_sp and interpreter_frame_sender_sp // interpreter_frame_sender_sp is the original sp of the caller (the unextended_sp) // and sender_sp is (fp + sender_sp_offset*wordSize)
// All frames but the initial (oldest) interpreter frame we fill in have a // value for sender_sp that allows walking the stack but isn't // truly correct. Correct the value here.
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.