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6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot

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Developed a reexecute logic for the interpreter to reexecute the bytecode when deopt happens

Reviewed-by: kvn, never, jrose, twisti
This commit is contained in:
Changpeng Fang 2009-07-31 17:12:33 -07:00
parent f2ea22a547
commit ae00753bf7
29 changed files with 465 additions and 241 deletions
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13
hotspot/src/share/vm/runtime/vframeArray.cpp
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@ -44,6 +44,7 @@ void vframeArrayElement::fill_in(compiledVFrame* vf) {
_method = vf->method();
_bci = vf->raw_bci();
_reexecute = vf->should_reexecute();
int index;
@ -148,16 +149,20 @@ void vframeArrayElement::unpack_on_stack(int callee_parameters,
// C++ interpreter doesn't need a pc since it will figure out what to do when it
// begins execution
address pc;
bool use_next_mdp; // true if we should use the mdp associated with the next bci
// rather than the one associated with bcp
bool use_next_mdp = false; // true if we should use the mdp associated with the next bci
// rather than the one associated with bcp
if (raw_bci() == SynchronizationEntryBCI) {
// We are deoptimizing while hanging in prologue code for synchronized method
bcp = method()->bcp_from(0); // first byte code
pc = Interpreter::deopt_entry(vtos, 0); // step = 0 since we don't skip current bytecode
use_next_mdp = false;
} else if (should_reexecute()) { //reexecute this bytecode
assert(is_top_frame, "reexecute allowed only for the top frame");
bcp = method()->bcp_from(bci());
pc = Interpreter::deopt_reexecute_entry(method(), bcp);
} else {
bcp = method()->bcp_from(bci());
pc = Interpreter::continuation_for(method(), bcp, callee_parameters, is_top_frame, use_next_mdp);
pc = Interpreter::deopt_continue_after_entry(method(), bcp, callee_parameters, is_top_frame);
use_next_mdp = true;
}
assert(Bytecodes::is_defined(*bcp), "must be a valid bytecode");