| /* |
| * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2014, Red Hat Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "asm/macroAssembler.hpp" |
| #include "classfile/javaClasses.inline.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "interpreter/interpreterRuntime.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "prims/methodHandles.hpp" |
| #include "runtime/flags/flagSetting.hpp" |
| #include "runtime/frame.inline.hpp" |
| |
| #define __ _masm-> |
| |
| #ifdef PRODUCT |
| #define BLOCK_COMMENT(str) /* nothing */ |
| #else |
| #define BLOCK_COMMENT(str) __ block_comment(str) |
| #endif |
| |
| #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") |
| |
| void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { |
| if (VerifyMethodHandles) |
| verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), |
| "MH argument is a Class"); |
| __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); |
| } |
| |
| #ifdef ASSERT |
| static int check_nonzero(const char* xname, int x) { |
| assert(x != 0, "%s should be nonzero", xname); |
| return x; |
| } |
| #define NONZERO(x) check_nonzero(#x, x) |
| #else //ASSERT |
| #define NONZERO(x) (x) |
| #endif //PRODUCT |
| |
| #ifdef ASSERT |
| void MethodHandles::verify_klass(MacroAssembler* _masm, |
| Register obj, SystemDictionary::WKID klass_id, |
| const char* error_message) { |
| InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
| Klass* klass = SystemDictionary::well_known_klass(klass_id); |
| Register temp = rscratch2; |
| Register temp2 = rscratch1; // used by MacroAssembler::cmpptr |
| Label L_ok, L_bad; |
| BLOCK_COMMENT("verify_klass {"); |
| __ verify_oop(obj); |
| __ cbz(obj, L_bad); |
| __ push(RegSet::of(temp, temp2), sp); |
| __ load_klass(temp, obj); |
| __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
| __ br(Assembler::EQ, L_ok); |
| intptr_t super_check_offset = klass->super_check_offset(); |
| __ ldr(temp, Address(temp, super_check_offset)); |
| __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
| __ br(Assembler::EQ, L_ok); |
| __ pop(RegSet::of(temp, temp2), sp); |
| __ bind(L_bad); |
| __ stop(error_message); |
| __ BIND(L_ok); |
| __ pop(RegSet::of(temp, temp2), sp); |
| BLOCK_COMMENT("} verify_klass"); |
| } |
| |
| void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { } |
| |
| #endif //ASSERT |
| |
| void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, |
| bool for_compiler_entry) { |
| assert(method == rmethod, "interpreter calling convention"); |
| Label L_no_such_method; |
| __ cbz(rmethod, L_no_such_method); |
| __ verify_method_ptr(method); |
| |
| if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { |
| Label run_compiled_code; |
| // JVMTI events, such as single-stepping, are implemented partly by avoiding running |
| // compiled code in threads for which the event is enabled. Check here for |
| // interp_only_mode if these events CAN be enabled. |
| |
| __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset())); |
| __ cbzw(rscratch1, run_compiled_code); |
| __ ldr(rscratch1, Address(method, Method::interpreter_entry_offset())); |
| __ br(rscratch1); |
| __ BIND(run_compiled_code); |
| } |
| |
| const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : |
| Method::from_interpreted_offset(); |
| __ ldr(rscratch1,Address(method, entry_offset)); |
| __ br(rscratch1); |
| __ bind(L_no_such_method); |
| __ far_jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); |
| } |
| |
| void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, |
| Register recv, Register method_temp, |
| Register temp2, |
| bool for_compiler_entry) { |
| BLOCK_COMMENT("jump_to_lambda_form {"); |
| // This is the initial entry point of a lazy method handle. |
| // After type checking, it picks up the invoker from the LambdaForm. |
| assert_different_registers(recv, method_temp, temp2); |
| assert(recv != noreg, "required register"); |
| assert(method_temp == rmethod, "required register for loading method"); |
| |
| //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); |
| |
| // Load the invoker, as MH -> MH.form -> LF.vmentry |
| __ verify_oop(recv); |
| __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), temp2); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), temp2); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), temp2); |
| __ verify_oop(method_temp); |
| __ access_load_at(T_ADDRESS, IN_HEAP, method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), noreg, noreg); |
| |
| if (VerifyMethodHandles && !for_compiler_entry) { |
| // make sure recv is already on stack |
| __ ldr(temp2, Address(method_temp, Method::const_offset())); |
| __ load_sized_value(temp2, |
| Address(temp2, ConstMethod::size_of_parameters_offset()), |
| sizeof(u2), /*is_signed*/ false); |
| // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
| Label L; |
| __ ldr(rscratch1, __ argument_address(temp2, -1)); |
| __ cmpoop(recv, rscratch1); |
| __ br(Assembler::EQ, L); |
| __ ldr(r0, __ argument_address(temp2, -1)); |
| __ hlt(0); |
| __ BIND(L); |
| } |
| |
| jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); |
| BLOCK_COMMENT("} jump_to_lambda_form"); |
| } |
| |
| // Code generation |
| address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, |
| vmIntrinsics::ID iid) { |
| const bool not_for_compiler_entry = false; // this is the interpreter entry |
| assert(is_signature_polymorphic(iid), "expected invoke iid"); |
| if (iid == vmIntrinsics::_invokeGeneric || |
| iid == vmIntrinsics::_compiledLambdaForm) { |
| // Perhaps surprisingly, the symbolic references visible to Java are not directly used. |
| // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. |
| // They all allow an appendix argument. |
| __ hlt(0); // empty stubs make SG sick |
| return NULL; |
| } |
| |
| // r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) |
| // rmethod: Method* |
| // r3: argument locator (parameter slot count, added to rsp) |
| // r1: used as temp to hold mh or receiver |
| // r0, r11: garbage temps, blown away |
| Register argp = r3; // argument list ptr, live on error paths |
| Register temp = r0; |
| Register mh = r1; // MH receiver; dies quickly and is recycled |
| |
| // here's where control starts out: |
| __ align(CodeEntryAlignment); |
| address entry_point = __ pc(); |
| |
| if (VerifyMethodHandles) { |
| assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); |
| |
| Label L; |
| BLOCK_COMMENT("verify_intrinsic_id {"); |
| __ ldrh(rscratch1, Address(rmethod, Method::intrinsic_id_offset_in_bytes())); |
| __ cmp(rscratch1, (int) iid); |
| __ br(Assembler::EQ, L); |
| if (iid == vmIntrinsics::_linkToVirtual || |
| iid == vmIntrinsics::_linkToSpecial) { |
| // could do this for all kinds, but would explode assembly code size |
| trace_method_handle(_masm, "bad Method*::intrinsic_id"); |
| } |
| __ hlt(0); |
| __ bind(L); |
| BLOCK_COMMENT("} verify_intrinsic_id"); |
| } |
| |
| // First task: Find out how big the argument list is. |
| Address r3_first_arg_addr; |
| int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); |
| assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); |
| if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { |
| __ ldr(argp, Address(rmethod, Method::const_offset())); |
| __ load_sized_value(argp, |
| Address(argp, ConstMethod::size_of_parameters_offset()), |
| sizeof(u2), /*is_signed*/ false); |
| // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
| r3_first_arg_addr = __ argument_address(argp, -1); |
| } else { |
| DEBUG_ONLY(argp = noreg); |
| } |
| |
| if (!is_signature_polymorphic_static(iid)) { |
| __ ldr(mh, r3_first_arg_addr); |
| DEBUG_ONLY(argp = noreg); |
| } |
| |
| // r3_first_arg_addr is live! |
| |
| trace_method_handle_interpreter_entry(_masm, iid); |
| if (iid == vmIntrinsics::_invokeBasic) { |
| generate_method_handle_dispatch(_masm, iid, mh, noreg, not_for_compiler_entry); |
| |
| } else { |
| // Adjust argument list by popping the trailing MemberName argument. |
| Register recv = noreg; |
| if (MethodHandles::ref_kind_has_receiver(ref_kind)) { |
| // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. |
| __ ldr(recv = r2, r3_first_arg_addr); |
| } |
| DEBUG_ONLY(argp = noreg); |
| Register rmember = rmethod; // MemberName ptr; incoming method ptr is dead now |
| __ pop(rmember); // extract last argument |
| generate_method_handle_dispatch(_masm, iid, recv, rmember, not_for_compiler_entry); |
| } |
| |
| return entry_point; |
| } |
| |
| |
| 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::method_offset_in_bytes())); |
| Address vmtarget_method( rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::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, temp3); |
| 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); |
| } |
| __ load_heap_oop(rmethod, member_vmtarget); |
| __ access_load_at(T_ADDRESS, IN_HEAP, rmethod, vmtarget_method, noreg, noreg); |
| break; |
| |
| case vmIntrinsics::_linkToStatic: |
| if (VerifyMethodHandles) { |
| verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); |
| } |
| __ load_heap_oop(rmethod, member_vmtarget); |
| __ access_load_at(T_ADDRESS, IN_HEAP, rmethod, vmtarget_method, noreg, noreg); |
| 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; |
| __ access_load_at(T_ADDRESS, IN_HEAP, temp2_index, member_vmindex, noreg, noreg); |
| |
| 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; |
| __ access_load_at(T_ADDRESS, IN_HEAP, rindex, member_vmindex, noreg, noreg); |
| 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())); |
| } |
| } |
| } |
| |
| #ifndef PRODUCT |
| void trace_method_handle_stub(const char* adaptername, |
| oop mh, |
| intptr_t* saved_regs, |
| intptr_t* entry_sp) { } |
| |
| // The stub wraps the arguments in a struct on the stack to avoid |
| // dealing with the different calling conventions for passing 6 |
| // arguments. |
| struct MethodHandleStubArguments { |
| const char* adaptername; |
| oopDesc* mh; |
| intptr_t* saved_regs; |
| intptr_t* entry_sp; |
| }; |
| void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { } |
| |
| void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { } |
| #endif //PRODUCT |
