// These stubs are used by the compiler only.
// Argument registers, which must be preserved:
// rcx - receiver (always first argument)
// rdx - second argument (if any)
// Other registers that might be usable:
// rax - inline cache register (is interface for itable stub)
// rbx - method (used when calling out to interpreter)
// Available now, but may become callee-save at some point:
// rsi, rdi
// Note that rax and rdx are also used for return values.
//
VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
const int i486_code_length = VtableStub::pd_code_size_limit(true);
VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
// Can be NULL if there is no free space in the code cache.
if (s == NULL) {
return NULL;
}
ResourceMark rm;
CodeBuffer cb(s->entry_point(), i486_code_length);
MacroAssembler* masm = new MacroAssembler(&cb);
#ifndef PRODUCT
if (CountCompiledCalls) {
__ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
}
#endif /* PRODUCT */
// get receiver (need to skip return address on top of stack)
assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
// get receiver klass
address npe_addr = __ pc();
__ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
#ifndef PRODUCT
if (DebugVtables) {
Label L;
// check offset vs vtable length
__ cmpl(Address(rax, InstanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
__ jcc(Assembler::greater, L);
__ movl(rbx, vtable_index);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
__ bind(L);
}
#endif // PRODUCT
const Register method = rbx;
// load Method* and target address
__ lookup_virtual_method(rax, vtable_index, method);
if (DebugVtables) {
Label L;
__ cmpptr(method, (int32_t)NULL_WORD);
__ jcc(Assembler::equal, L);
__ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
__ jcc(Assembler::notZero, L);
__ stop("Vtable entry is NULL");
__ bind(L);
}
// rax,: receiver klass
// method (rbx): Method*
// rcx: receiver
address ame_addr = __ pc();
__ jmp( Address(method, Method::from_compiled_offset()));
masm->flush();
if (PrintMiscellaneous && (WizardMode || Verbose)) {
tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
vtable_index, s->entry_point(),
(int)(s->code_end() - s->entry_point()),
(int)(s->code_end() - __ pc()));
}
guarantee(__ pc() <= s->code_end(), "overflowed buffer");
// shut the door on sizing bugs
int slop = 3; // 32-bit offset is this much larger than an 8-bit one
assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
s->set_exception_points(npe_addr, ame_addr);
return s;
}
void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
vmIntrinsics::ID iid,
Register receiver_reg,
Register member_reg,
bool for_compiler_entry) {
assert(is_signature_polymorphic(iid), "expected invoke iid");
Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
if (iid == vmIntrinsics::_invokeBasic) {
// indirect through MH.form.vmentry.vmtarget
jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
} else {
// The method is a member invoker used by direct method handles.
if (VerifyMethodHandles) {
// make sure the trailing argument really is a MemberName (caller responsibility)
verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
temp1, temp2,
"MemberName required for invokeVirtual etc.");
}
Register temp1_recv_klass = temp1;
if (iid != vmIntrinsics::_linkToStatic) {
__ verify_oop(receiver_reg);
if (iid == vmIntrinsics::_linkToSpecial) {
// Don't actually load the klass; just null-check the receiver.
__ null_check_throw(receiver_reg, -1, temp1, EXCEPTION_ENTRY);
} else {
// load receiver klass itself
__ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1, EXCEPTION_ENTRY);
__ load_klass(temp1_recv_klass, receiver_reg);
__ verify_klass_ptr(temp1_recv_klass);
}
BLOCK_COMMENT("check_receiver {");
// The receiver for the MemberName must be in receiver_reg.
// Check the receiver against the MemberName.clazz
if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
// Did not load it above...
__ load_klass(temp1_recv_klass, receiver_reg);
__ verify_klass_ptr(temp1_recv_klass);
}
if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
Label L_ok;
Register temp2_defc = temp2;
__ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
__ verify_klass_ptr(temp2_defc);
__ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
// If we get here, the type check failed!
__ stop("receiver class disagrees with MemberName.clazz");
__ BIND(L_ok);
}
BLOCK_COMMENT("} check_receiver");
}
if (iid == vmIntrinsics::_linkToSpecial ||
iid == vmIntrinsics::_linkToStatic) {
DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
}
// Live registers at this point:
// member_reg - MemberName that was the trailing argument
// temp1_recv_klass - klass of stacked receiver, if needed
// O5_savedSP - interpreter linkage (if interpreted)
// O0..O5 - compiler arguments (if compiled)
Label L_incompatible_class_change_error;
switch (iid) {
case vmIntrinsics::_linkToSpecial:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
}
__ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
break;
case vmIntrinsics::_linkToStatic:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
}
__ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
break;
case vmIntrinsics::_linkToVirtual:
{
// same as TemplateTable::invokevirtual,
// minus the CP setup and profiling:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
}
// pick out the vtable index from the MemberName, and then we can discard it:
Register temp2_index = temp2;
__ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
if (VerifyMethodHandles) {
Label L_index_ok;
__ cmpdi(CCR1, temp2_index, 0);
__ bge(CCR1, L_index_ok);
__ stop("no virtual index");
__ BIND(L_index_ok);
}
// Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
// at this point. And VerifyMethodHandles has already checked clazz, if needed.
// get target Method* & entry point
__ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
break;
}
case vmIntrinsics::_linkToInterface:
{
// same as TemplateTable::invokeinterface
// (minus the CP setup and profiling, with different argument motion)
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
}
Register temp2_intf = temp2;
__ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
__ verify_klass_ptr(temp2_intf);
Register vtable_index = R19_method;
__ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
if (VerifyMethodHandles) {
Label L_index_ok;
__ cmpdi(CCR1, vtable_index, 0);
__ bge(CCR1, L_index_ok);
__ stop("invalid vtable index for MH.invokeInterface");
__ BIND(L_index_ok);
}
// given intf, index, and recv klass, dispatch to the implementation method
__ lookup_interface_method(temp1_recv_klass, temp2_intf,
// note: next two args must be the same:
vtable_index, R19_method,
temp3, temp4,
L_incompatible_class_change_error);
break;
}
default:
fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
break;
}
// Live at this point:
// R19_method
// O5_savedSP (if interpreted)
// After figuring out which concrete method to call, jump into it.
// Note that this works in the interpreter with no data motion.
// But the compiled version will require that rcx_recv be shifted out.
__ verify_method_ptr(R19_method);
jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
if (iid == vmIntrinsics::_linkToInterface) {
__ BIND(L_incompatible_class_change_error);
__ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
__ mtctr(temp1);
__ bctr();
}
}
}
VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
const int aarch64_code_length = VtableStub::pd_code_size_limit(true);
VtableStub* s = new(aarch64_code_length) VtableStub(true, vtable_index);
ResourceMark rm;
CodeBuffer cb(s->entry_point(), aarch64_code_length);
MacroAssembler* masm = new MacroAssembler(&cb);
#ifndef PRODUCT
if (CountCompiledCalls) {
__ lea(r19, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
__ incrementw(Address(r19));
}
#endif
// get receiver (need to skip return address on top of stack)
assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
// get receiver klass
address npe_addr = __ pc();
__ load_klass(r19, j_rarg0);
#ifndef PRODUCT
if (DebugVtables) {
Label L;
// check offset vs vtable length
__ ldrw(rscratch1, Address(r19, Klass::vtable_length_offset()));
__ cmpw(rscratch1, vtable_index * vtableEntry::size());
__ br(Assembler::GT, L);
__ enter();
__ mov(r2, vtable_index);
__ call_VM(noreg,
CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, r2);
__ leave();
__ bind(L);
}
#endif // PRODUCT
__ lookup_virtual_method(r19, vtable_index, rmethod);
if (DebugVtables) {
Label L;
__ cbz(rmethod, L);
__ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
__ cbnz(rscratch1, L);
__ stop("Vtable entry is NULL");
__ bind(L);
}
// r0: receiver klass
// rmethod: Method*
// r2: receiver
address ame_addr = __ pc();
__ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
__ br(rscratch1);
__ flush();
if (PrintMiscellaneous && (WizardMode || Verbose)) {
tty->print_cr("vtable #%d at " PTR_FORMAT "[%d] left over: %d",
vtable_index, p2i(s->entry_point()),
(int)(s->code_end() - s->entry_point()),
(int)(s->code_end() - __ pc()));
}
guarantee(__ pc() <= s->code_end(), "overflowed buffer");
s->set_exception_points(npe_addr, ame_addr);
return s;
}
// Used by compiler only; may use only caller saved, non-argument registers
// NOTE: %%%% if any change is made to this stub make sure that the function
// pd_code_size_limit is changed to ensure the correct size for VtableStub
VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
const int sparc_code_length = VtableStub::pd_code_size_limit(true);
VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
// Can be NULL if there is no free space in the code cache.
if (s == NULL) {
return NULL;
}
ResourceMark rm;
CodeBuffer cb(s->entry_point(), sparc_code_length);
MacroAssembler* masm = new MacroAssembler(&cb);
#ifndef PRODUCT
if (CountCompiledCalls) {
__ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch);
}
#endif /* PRODUCT */
assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
// get receiver klass
address npe_addr = __ pc();
__ load_klass(O0, G3_scratch);
// set Method* (in case of interpreted method), and destination address
#ifndef PRODUCT
if (DebugVtables) {
Label L;
// check offset vs vtable length
__ ld(G3_scratch, in_bytes(Klass::vtable_length_offset()), G5);
__ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L);
__ set(vtable_index, O2);
__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
__ bind(L);
}
#endif
__ lookup_virtual_method(G3_scratch, vtable_index, G5_method);
#ifndef PRODUCT
if (DebugVtables) {
Label L;
__ br_notnull_short(G5_method, Assembler::pt, L);
__ stop("Vtable entry is ZERO");
__ bind(L);
}
#endif
address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
// NOTE: for vtable dispatches, the vtable entry will never be null.
__ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
// jump to target (either compiled code or c2iadapter)
__ JMP(G3_scratch, 0);
// load Method* (in case we call c2iadapter)
__ delayed()->nop();
masm->flush();
if (PrintMiscellaneous && (WizardMode || Verbose)) {
tty->print_cr("vtable #%d at " PTR_FORMAT "[%d] left over: %d",
vtable_index, p2i(s->entry_point()),
(int)(s->code_end() - s->entry_point()),
(int)(s->code_end() - __ pc()));
}
guarantee(__ pc() <= s->code_end(), "overflowed buffer");
// shut the door on sizing bugs
int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
s->set_exception_points(npe_addr, ame_addr);
return s;
}
void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
vmIntrinsics::ID iid,
Register receiver_reg,
Register member_reg,
bool for_compiler_entry) {
assert(is_signature_polymorphic(iid), "expected invoke iid");
// temps used in this code are not used in *either* compiled or interpreted calling sequences
Register temp1 = r10;
Register temp2 = r11;
Register temp3 = r14; // r13 is live by this point: it contains the sender SP
if (for_compiler_entry) {
assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
}
assert_different_registers(temp1, temp2, temp3, receiver_reg);
assert_different_registers(temp1, temp2, temp3, member_reg);
if (iid == vmIntrinsics::_invokeBasic) {
// indirect through MH.form.vmentry.vmtarget
jump_to_lambda_form(_masm, receiver_reg, rmethod, temp1, for_compiler_entry);
} else {
// The method is a member invoker used by direct method handles.
if (VerifyMethodHandles) {
// make sure the trailing argument really is a MemberName (caller responsibility)
verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
"MemberName required for invokeVirtual etc.");
}
Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
Register temp1_recv_klass = temp1;
if (iid != vmIntrinsics::_linkToStatic) {
__ verify_oop(receiver_reg);
if (iid == vmIntrinsics::_linkToSpecial) {
// Don't actually load the klass; just null-check the receiver.
__ null_check(receiver_reg);
} else {
// load receiver klass itself
__ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
__ load_klass(temp1_recv_klass, receiver_reg);
__ verify_klass_ptr(temp1_recv_klass);
}
BLOCK_COMMENT("check_receiver {");
// The receiver for the MemberName must be in receiver_reg.
// Check the receiver against the MemberName.clazz
if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
// Did not load it above...
__ load_klass(temp1_recv_klass, receiver_reg);
__ verify_klass_ptr(temp1_recv_klass);
}
if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
Label L_ok;
Register temp2_defc = temp2;
__ load_heap_oop(temp2_defc, member_clazz);
load_klass_from_Class(_masm, temp2_defc);
__ verify_klass_ptr(temp2_defc);
__ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
// If we get here, the type check failed!
__ hlt(0);
// __ STOP("receiver class disagrees with MemberName.clazz");
__ bind(L_ok);
}
BLOCK_COMMENT("} check_receiver");
}
if (iid == vmIntrinsics::_linkToSpecial ||
iid == vmIntrinsics::_linkToStatic) {
DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
}
// Live registers at this point:
// member_reg - MemberName that was the trailing argument
// temp1_recv_klass - klass of stacked receiver, if needed
// r13 - interpreter linkage (if interpreted) ??? FIXME
// r1 ... r0 - compiler arguments (if compiled)
Label L_incompatible_class_change_error;
switch (iid) {
case vmIntrinsics::_linkToSpecial:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
}
__ ldr(rmethod, member_vmtarget);
break;
case vmIntrinsics::_linkToStatic:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
}
__ ldr(rmethod, member_vmtarget);
break;
case vmIntrinsics::_linkToVirtual:
{
// same as TemplateTable::invokevirtual,
// minus the CP setup and profiling:
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
}
// pick out the vtable index from the MemberName, and then we can discard it:
Register temp2_index = temp2;
__ ldr(temp2_index, member_vmindex);
if (VerifyMethodHandles) {
Label L_index_ok;
__ cmpw(temp2_index, 0U);
__ br(Assembler::GE, L_index_ok);
__ hlt(0);
__ BIND(L_index_ok);
}
// Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
// at this point. And VerifyMethodHandles has already checked clazz, if needed.
// get target Method* & entry point
__ lookup_virtual_method(temp1_recv_klass, temp2_index, rmethod);
break;
}
case vmIntrinsics::_linkToInterface:
{
// same as TemplateTable::invokeinterface
// (minus the CP setup and profiling, with different argument motion)
if (VerifyMethodHandles) {
verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
}
Register temp3_intf = temp3;
__ load_heap_oop(temp3_intf, member_clazz);
load_klass_from_Class(_masm, temp3_intf);
__ verify_klass_ptr(temp3_intf);
Register rindex = rmethod;
__ ldr(rindex, member_vmindex);
if (VerifyMethodHandles) {
Label L;
__ cmpw(rindex, 0U);
__ br(Assembler::GE, L);
__ hlt(0);
__ bind(L);
}
// given intf, index, and recv klass, dispatch to the implementation method
__ lookup_interface_method(temp1_recv_klass, temp3_intf,
// note: next two args must be the same:
rindex, rmethod,
temp2,
L_incompatible_class_change_error);
break;
}
default:
fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
break;
}
// live at this point: rmethod, r13 (if interpreted)
// After figuring out which concrete method to call, jump into it.
// Note that this works in the interpreter with no data motion.
// But the compiled version will require that r2_recv be shifted out.
__ verify_method_ptr(rmethod);
jump_from_method_handle(_masm, rmethod, temp1, for_compiler_entry);
if (iid == vmIntrinsics::_linkToInterface) {
__ bind(L_incompatible_class_change_error);
__ far_jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
}
}
}