// If deoptimization happens, this function returns the point of next bytecode to continue execution
address AbstractInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) {
assert(method->contains(bcp), "just checkin'");
Bytecodes::Code code = Bytecodes::java_code_at(bcp);
assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
int bci = method->bci_from(bcp);
int length = -1; // initial value for debugging
// compute continuation length
length = Bytecodes::length_at(bcp);
// compute result type
BasicType type = T_ILLEGAL;
switch (code) {
case Bytecodes::_invokevirtual :
case Bytecodes::_invokespecial :
case Bytecodes::_invokestatic :
case Bytecodes::_invokeinterface: {
Thread *thread = Thread::current();
ResourceMark rm(thread);
methodHandle mh(thread, method);
type = Bytecode_invoke_at(mh, bci)->result_type(thread);
// since the cache entry might not be initialized:
// (NOT needed for the old calling convension)
if (!is_top_frame) {
int index = Bytes::get_native_u2(bcp+1);
method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
}
break;
}
case Bytecodes::_invokedynamic: {
Thread *thread = Thread::current();
ResourceMark rm(thread);
methodHandle mh(thread, method);
type = Bytecode_invoke_at(mh, bci)->result_type(thread);
// since the cache entry might not be initialized:
// (NOT needed for the old calling convension)
if (!is_top_frame) {
int index = Bytes::get_native_u4(bcp+1);
method->constants()->cache()->secondary_entry_at(index)->set_parameter_size(callee_parameters);
}
break;
}
case Bytecodes::_ldc :
case Bytecodes::_ldc_w : // fall through
case Bytecodes::_ldc2_w:
{
Thread *thread = Thread::current();
ResourceMark rm(thread);
methodHandle mh(thread, method);
type = Bytecode_loadconstant_at(mh, bci)->result_type();
break;
}
default:
type = Bytecodes::result_type(code);
break;
}
// return entry point for computed continuation state & bytecode length
return
is_top_frame
? Interpreter::deopt_entry (as_TosState(type), length)
: Interpreter::return_entry(as_TosState(type), length);
}
bool MethodComparator::args_same(Bytecodes::Code c_old, Bytecodes::Code c_new) {
// BytecodeStream returns the correct standard Java bytecodes for various "fast"
// bytecode versions, so we don't have to bother about them here..
switch (c_old) {
case Bytecodes::_new : // fall through
case Bytecodes::_anewarray : // fall through
case Bytecodes::_multianewarray : // fall through
case Bytecodes::_checkcast : // fall through
case Bytecodes::_instanceof : {
u2 cpi_old = _s_old->get_index_u2();
u2 cpi_new = _s_new->get_index_u2();
if ((_old_cp->klass_at_noresolve(cpi_old) != _new_cp->klass_at_noresolve(cpi_new)))
return false;
if (c_old == Bytecodes::_multianewarray &&
*(jbyte*)(_s_old->bcp() + 3) != *(jbyte*)(_s_new->bcp() + 3))
return false;
break;
}
case Bytecodes::_getstatic : // fall through
case Bytecodes::_putstatic : // fall through
case Bytecodes::_getfield : // fall through
case Bytecodes::_putfield : // fall through
case Bytecodes::_invokevirtual : // fall through
case Bytecodes::_invokespecial : // fall through
case Bytecodes::_invokestatic : // fall through
case Bytecodes::_invokedynamic : // fall through
case Bytecodes::_invokeinterface : {
int cpci_old = _s_old->has_index_u4() ? _s_old->get_index_u4() : _s_old->get_index_u2_cpcache();
int cpci_new = _s_new->has_index_u4() ? _s_new->get_index_u4() : _s_new->get_index_u2_cpcache();
// Check if the names of classes, field/method names and signatures at these indexes
// are the same. Indices which are really into constantpool cache (rather than constant
// pool itself) are accepted by the constantpool query routines below.
if ((_old_cp->klass_ref_at_noresolve(cpci_old) != _new_cp->klass_ref_at_noresolve(cpci_new)) ||
(_old_cp->name_ref_at(cpci_old) != _new_cp->name_ref_at(cpci_new)) ||
(_old_cp->signature_ref_at(cpci_old) != _new_cp->signature_ref_at(cpci_new)))
return false;
break;
}
case Bytecodes::_ldc : // fall through
case Bytecodes::_ldc_w : {
Bytecode_loadconstant* ldc_old = Bytecode_loadconstant_at(_s_old->method(), _s_old->bci());
Bytecode_loadconstant* ldc_new = Bytecode_loadconstant_at(_s_new->method(), _s_new->bci());
int cpi_old = ldc_old->pool_index();
int cpi_new = ldc_new->pool_index();
constantTag tag_old = _old_cp->tag_at(cpi_old);
constantTag tag_new = _new_cp->tag_at(cpi_new);
if (tag_old.is_int() || tag_old.is_float()) {
if (tag_old.value() != tag_new.value())
return false;
if (tag_old.is_int()) {
if (_old_cp->int_at(cpi_old) != _new_cp->int_at(cpi_new))
return false;
} else {
// Use jint_cast to compare the bits rather than numerical values.
// This makes a difference for NaN constants.
if (jint_cast(_old_cp->float_at(cpi_old)) != jint_cast(_new_cp->float_at(cpi_new)))
return false;
}
} else if (tag_old.is_string() || tag_old.is_unresolved_string()) {
if (! (tag_new.is_unresolved_string() || tag_new.is_string()))
return false;
if (strcmp(_old_cp->string_at_noresolve(cpi_old),
_new_cp->string_at_noresolve(cpi_new)) != 0)
return false;
} else if (tag_old.is_klass() || tag_old.is_unresolved_klass()) {
// tag_old should be klass - 4881222
if (! (tag_new.is_unresolved_klass() || tag_new.is_klass()))
return false;
if (_old_cp->klass_at_noresolve(cpi_old) !=
_new_cp->klass_at_noresolve(cpi_new))
return false;
} else if (tag_old.is_method_type() && tag_new.is_method_type()) {
int mti_old = _old_cp->method_type_index_at(cpi_old);
int mti_new = _new_cp->method_type_index_at(cpi_new);
if ((_old_cp->symbol_at(mti_old) != _new_cp->symbol_at(mti_new)))
return false;
} else if (tag_old.is_method_handle() && tag_new.is_method_handle()) {
if (_old_cp->method_handle_ref_kind_at(cpi_old) !=
_new_cp->method_handle_ref_kind_at(cpi_new))
return false;
int mhi_old = _old_cp->method_handle_index_at(cpi_old);
int mhi_new = _new_cp->method_handle_index_at(cpi_new);
if ((_old_cp->uncached_klass_ref_at_noresolve(mhi_old) != _new_cp->uncached_klass_ref_at_noresolve(mhi_new)) ||
(_old_cp->uncached_name_ref_at(mhi_old) != _new_cp->uncached_name_ref_at(mhi_new)) ||
(_old_cp->uncached_signature_ref_at(mhi_old) != _new_cp->uncached_signature_ref_at(mhi_new)))
return false;
} else {
return false; // unknown tag
}
break;
}
case Bytecodes::_ldc2_w : {
u2 cpi_old = _s_old->get_index_u2();
u2 cpi_new = _s_new->get_index_u2();
constantTag tag_old = _old_cp->tag_at(cpi_old);
constantTag tag_new = _new_cp->tag_at(cpi_new);
if (tag_old.value() != tag_new.value())
return false;
if (tag_old.is_long()) {
if (_old_cp->long_at(cpi_old) != _new_cp->long_at(cpi_new))
return false;
} else {
// Use jlong_cast to compare the bits rather than numerical values.
// This makes a difference for NaN constants.
if (jlong_cast(_old_cp->double_at(cpi_old)) != jlong_cast(_new_cp->double_at(cpi_new)))
return false;
}
break;
}
case Bytecodes::_bipush :
if (_s_old->bcp()[1] != _s_new->bcp()[1])
return false;
break;
case Bytecodes::_sipush :
if (_s_old->get_index_u2() != _s_new->get_index_u2())
return false;
break;
case Bytecodes::_aload : // fall through
case Bytecodes::_astore : // fall through
case Bytecodes::_dload : // fall through
case Bytecodes::_dstore : // fall through
case Bytecodes::_fload : // fall through
case Bytecodes::_fstore : // fall through
case Bytecodes::_iload : // fall through
case Bytecodes::_istore : // fall through
case Bytecodes::_lload : // fall through
case Bytecodes::_lstore : // fall through
case Bytecodes::_ret :
if (_s_old->is_wide() != _s_new->is_wide())
return false;
if (_s_old->get_index() != _s_new->get_index())
return false;
break;
case Bytecodes::_goto : // fall through
case Bytecodes::_if_acmpeq : // fall through
case Bytecodes::_if_acmpne : // fall through
case Bytecodes::_if_icmpeq : // fall through
case Bytecodes::_if_icmpne : // fall through
case Bytecodes::_if_icmplt : // fall through
case Bytecodes::_if_icmpge : // fall through
case Bytecodes::_if_icmpgt : // fall through
case Bytecodes::_if_icmple : // fall through
case Bytecodes::_ifeq : // fall through
case Bytecodes::_ifne : // fall through
case Bytecodes::_iflt : // fall through
case Bytecodes::_ifge : // fall through
case Bytecodes::_ifgt : // fall through
case Bytecodes::_ifle : // fall through
case Bytecodes::_ifnonnull : // fall through
case Bytecodes::_ifnull : // fall through
case Bytecodes::_jsr : {
int old_ofs = _s_old->bytecode()->get_offset_s2(c_old);
int new_ofs = _s_new->bytecode()->get_offset_s2(c_new);
if (_switchable_test) {
int old_dest = _s_old->bci() + old_ofs;
int new_dest = _s_new->bci() + new_ofs;
if (old_ofs < 0 && new_ofs < 0) {
if (! _bci_map->old_and_new_locations_same(old_dest, new_dest))
return false;
} else if (old_ofs > 0 && new_ofs > 0) {
_fwd_jmps->append(old_dest);
_fwd_jmps->append(new_dest);
} else {
return false;
}
} else {
if (old_ofs != new_ofs)
return false;
}
break;
}
case Bytecodes::_iinc :
if (_s_old->is_wide() != _s_new->is_wide())
return false;
if (! _s_old->is_wide()) {
// We could use get_index_u1 and get_constant_u1, but it's simpler to grab both bytes at once:
if (Bytes::get_Java_u2(_s_old->bcp() + 1) != Bytes::get_Java_u2(_s_new->bcp() + 1))
return false;
} else {
// We could use get_index_u2 and get_constant_u2, but it's simpler to grab all four bytes at once:
if (Bytes::get_Java_u4(_s_old->bcp() + 1) != Bytes::get_Java_u4(_s_new->bcp() + 1))
return false;
}
break;
case Bytecodes::_goto_w : // fall through
case Bytecodes::_jsr_w : {
int old_ofs = _s_old->bytecode()->get_offset_s4(c_old);
int new_ofs = _s_new->bytecode()->get_offset_s4(c_new);
if (_switchable_test) {
int old_dest = _s_old->bci() + old_ofs;
int new_dest = _s_new->bci() + new_ofs;
if (old_ofs < 0 && new_ofs < 0) {
if (! _bci_map->old_and_new_locations_same(old_dest, new_dest))
return false;
} else if (old_ofs > 0 && new_ofs > 0) {
_fwd_jmps->append(old_dest);
_fwd_jmps->append(new_dest);
} else {
return false;
}
} else {
if (old_ofs != new_ofs)
return false;
}
break;
}
case Bytecodes::_lookupswitch : // fall through
case Bytecodes::_tableswitch : {
if (_switchable_test) {
address aligned_bcp_old = (address) round_to((intptr_t)_s_old->bcp() + 1, jintSize);
address aligned_bcp_new = (address) round_to((intptr_t)_s_new->bcp() + 1, jintSize);
int default_old = (int) Bytes::get_Java_u4(aligned_bcp_old);
int default_new = (int) Bytes::get_Java_u4(aligned_bcp_new);
_fwd_jmps->append(_s_old->bci() + default_old);
_fwd_jmps->append(_s_new->bci() + default_new);
if (c_old == Bytecodes::_lookupswitch) {
int npairs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize);
int npairs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize);
if (npairs_old != npairs_new)
return false;
for (int i = 0; i < npairs_old; i++) {
int match_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i)*jintSize);
int match_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i)*jintSize);
if (match_old != match_new)
return false;
int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (2+2*i+1)*jintSize);
int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (2+2*i+1)*jintSize);
_fwd_jmps->append(_s_old->bci() + ofs_old);
_fwd_jmps->append(_s_new->bci() + ofs_new);
}
} else if (c_old == Bytecodes::_tableswitch) {
int lo_old = (int) Bytes::get_Java_u4(aligned_bcp_old + jintSize);
int lo_new = (int) Bytes::get_Java_u4(aligned_bcp_new + jintSize);
if (lo_old != lo_new)
return false;
int hi_old = (int) Bytes::get_Java_u4(aligned_bcp_old + 2*jintSize);
int hi_new = (int) Bytes::get_Java_u4(aligned_bcp_new + 2*jintSize);
if (hi_old != hi_new)
return false;
for (int i = 0; i < hi_old - lo_old + 1; i++) {
int ofs_old = (int) Bytes::get_Java_u4(aligned_bcp_old + (3+i)*jintSize);
int ofs_new = (int) Bytes::get_Java_u4(aligned_bcp_new + (3+i)*jintSize);
_fwd_jmps->append(_s_old->bci() + ofs_old);
_fwd_jmps->append(_s_new->bci() + ofs_new);
}
}
} else { // !_switchable_test, can use fast rough compare
int len_old = _s_old->instruction_size();
int len_new = _s_new->instruction_size();
if (len_old != len_new)
return false;
if (memcmp(_s_old->bcp(), _s_new->bcp(), len_old) != 0)
return false;
}
break;
}
}
return true;
}
