| /* |
| * Copyright (c) 2008, 2013, Oracle and/or its affiliates. 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 "interpreter/interpreter.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "prims/methodHandles.hpp" |
| |
| #define __ _masm-> |
| |
| #ifdef PRODUCT |
| #define BLOCK_COMMENT(str) /* nothing */ |
| #define STOP(error) stop(error) |
| #else |
| #define BLOCK_COMMENT(str) __ block_comment(str) |
| #define STOP(error) block_comment(error); __ stop(error) |
| #endif |
| |
| #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") |
| |
| // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. |
| static RegisterOrConstant constant(int value) { |
| return RegisterOrConstant(value); |
| } |
| |
| void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) { |
| if (VerifyMethodHandles) |
| verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg, |
| "MH argument is a Class"); |
| __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg); |
| } |
| |
| #ifdef ASSERT |
| static int check_nonzero(const char* xname, int x) { |
| assert(x != 0, err_msg("%s should be nonzero", xname)); |
| return x; |
| } |
| #define NONZERO(x) check_nonzero(#x, x) |
| #else //ASSERT |
| #define NONZERO(x) (x) |
| #endif //ASSERT |
| |
| #ifdef ASSERT |
| void MethodHandles::verify_klass(MacroAssembler* _masm, |
| Register obj_reg, SystemDictionary::WKID klass_id, |
| Register temp_reg, Register temp2_reg, |
| const char* error_message) { |
| Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
| KlassHandle klass = SystemDictionary::well_known_klass(klass_id); |
| bool did_save = false; |
| if (temp_reg == noreg || temp2_reg == noreg) { |
| temp_reg = L1; |
| temp2_reg = L2; |
| __ save_frame_and_mov(0, obj_reg, L0); |
| obj_reg = L0; |
| did_save = true; |
| } |
| Label L_ok, L_bad; |
| BLOCK_COMMENT("verify_klass {"); |
| __ verify_oop(obj_reg); |
| __ br_null_short(obj_reg, Assembler::pn, L_bad); |
| __ load_klass(obj_reg, temp_reg); |
| __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); |
| __ ld_ptr(Address(temp2_reg, 0), temp2_reg); |
| __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); |
| intptr_t super_check_offset = klass->super_check_offset(); |
| __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg); |
| __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); |
| __ ld_ptr(Address(temp2_reg, 0), temp2_reg); |
| __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); |
| __ BIND(L_bad); |
| if (did_save) __ restore(); |
| __ STOP(error_message); |
| __ BIND(L_ok); |
| if (did_save) __ restore(); |
| BLOCK_COMMENT("} verify_klass"); |
| } |
| |
| void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { |
| Label L; |
| BLOCK_COMMENT("verify_ref_kind {"); |
| __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp); |
| __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp); |
| __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp); |
| __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L); |
| { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); |
| jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); |
| if (ref_kind == JVM_REF_invokeVirtual || |
| ref_kind == JVM_REF_invokeSpecial) |
| // could do this for all ref_kinds, but would explode assembly code size |
| trace_method_handle(_masm, buf); |
| __ STOP(buf); |
| } |
| BLOCK_COMMENT("} verify_ref_kind"); |
| __ bind(L); |
| } |
| |
| #endif // ASSERT |
| |
| void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, |
| bool for_compiler_entry) { |
| Label L_no_such_method; |
| assert(method == G5_method, "interpreter calling convention"); |
| assert_different_registers(method, target, temp); |
| |
| 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. |
| __ verify_thread(); |
| const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset()); |
| __ ld(interp_only, temp); |
| __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code); |
| // Null method test is replicated below in compiled case, |
| // it might be able to address across the verify_thread() |
| __ br_null_short(G5_method, Assembler::pn, L_no_such_method); |
| __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target); |
| __ jmp(target, 0); |
| __ delayed()->nop(); |
| __ BIND(run_compiled_code); |
| // Note: we could fill some delay slots here, but |
| // it doesn't matter, since this is interpreter code. |
| } |
| |
| // Compiled case, either static or fall-through from runtime conditional |
| __ br_null_short(G5_method, Assembler::pn, L_no_such_method); |
| |
| const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : |
| Method::from_interpreted_offset(); |
| __ ld_ptr(G5_method, in_bytes(entry_offset), target); |
| __ jmp(target, 0); |
| __ delayed()->nop(); |
| |
| __ bind(L_no_such_method); |
| AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry()); |
| __ jump_to(ame, temp); |
| __ delayed()->nop(); |
| } |
| |
| void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, |
| Register recv, Register method_temp, |
| Register temp2, Register temp3, |
| 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); // temp3 is only passed on |
| assert(method_temp == G5_method, "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(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp); |
| __ verify_oop(method_temp); |
| // the following assumes that a Method* is normally compressed in the vmtarget field: |
| __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())), method_temp); |
| |
| if (VerifyMethodHandles && !for_compiler_entry) { |
| // make sure recv is already on stack |
| __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2); |
| __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()), |
| temp2, |
| sizeof(u2), /*is_signed*/ false); |
| // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
| Label L; |
| __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2); |
| __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L); |
| __ STOP("receiver not on stack"); |
| __ BIND(L); |
| } |
| |
| jump_from_method_handle(_masm, method_temp, temp2, temp3, 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. |
| __ should_not_reach_here(); // empty stubs make SG sick |
| return NULL; |
| } |
| |
| // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted) |
| // G5_method: Method* |
| // G4 (Gargs): incoming argument list (must preserve) |
| // O0: used as temp to hold mh or receiver |
| // O1, O4: garbage temps, blown away |
| Register O1_scratch = O1; |
| Register O4_param_size = O4; // size of parameters |
| |
| // here's where control starts out: |
| __ align(CodeEntryAlignment); |
| address entry_point = __ pc(); |
| |
| if (VerifyMethodHandles) { |
| Label L; |
| BLOCK_COMMENT("verify_intrinsic_id {"); |
| __ ldub(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch); |
| __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, 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"); |
| } |
| __ STOP("bad Method*::intrinsic_id"); |
| __ bind(L); |
| BLOCK_COMMENT("} verify_intrinsic_id"); |
| } |
| |
| // First task: Find out how big the argument list is. |
| Address O4_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)) { |
| __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size); |
| __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()), |
| O4_param_size, |
| sizeof(u2), /*is_signed*/ false); |
| // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
| O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1); |
| } else { |
| DEBUG_ONLY(O4_param_size = noreg); |
| } |
| |
| Register O0_mh = noreg; |
| if (!is_signature_polymorphic_static(iid)) { |
| __ ld_ptr(O4_first_arg_addr, O0_mh = O0); |
| DEBUG_ONLY(O4_param_size = noreg); |
| } |
| |
| // O4_first_arg_addr is live! |
| |
| if (TraceMethodHandles) { |
| if (O0_mh != noreg) |
| __ mov(O0_mh, G3_method_handle); // make stub happy |
| trace_method_handle_interpreter_entry(_masm, iid); |
| } |
| |
| if (iid == vmIntrinsics::_invokeBasic) { |
| generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry); |
| |
| } else { |
| // Adjust argument list by popping the trailing MemberName argument. |
| Register O0_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. |
| __ ld_ptr(O4_first_arg_addr, O0_recv = O0); |
| DEBUG_ONLY(O4_param_size = noreg); |
| } |
| Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now |
| __ ld_ptr(__ argument_address(constant(0)), G5_member); |
| __ add(Gargs, Interpreter::stackElementSize, Gargs); |
| generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, 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"); |
| Register temp1 = (for_compiler_entry ? G1_scratch : O1); |
| Register temp2 = (for_compiler_entry ? G3_scratch : O2); |
| Register temp3 = (for_compiler_entry ? G4_scratch : O3); |
| Register temp4 = (for_compiler_entry ? noreg : O4); |
| if (for_compiler_entry) { |
| assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment"); |
| assert_different_registers(temp1, O0, O1, O2, O3, O4, O5); |
| assert_different_registers(temp2, O0, O1, O2, O3, O4, O5); |
| assert_different_registers(temp3, O0, O1, O2, O3, O4, O5); |
| assert_different_registers(temp4, O0, O1, O2, O3, O4, O5); |
| } else { |
| assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP |
| } |
| 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, G5_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."); |
| } |
| |
| 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(receiver_reg, temp1_recv_klass); |
| __ 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(receiver_reg, temp1_recv_klass); |
| __ verify_klass_ptr(temp1_recv_klass); |
| } |
| if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { |
| Label L_ok; |
| Register temp2_defc = temp2; |
| __ load_heap_oop(member_clazz, temp2_defc); |
| 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_ptr(member_vmtarget, G5_method); |
| break; |
| |
| case vmIntrinsics::_linkToStatic: |
| if (VerifyMethodHandles) { |
| verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); |
| } |
| __ ld_ptr(member_vmtarget, G5_method); |
| 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_ptr(member_vmindex, temp2_index); |
| |
| if (VerifyMethodHandles) { |
| Label L_index_ok; |
| __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, 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, G5_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(member_clazz, temp2_intf); |
| load_klass_from_Class(_masm, temp2_intf, temp3, temp4); |
| __ verify_klass_ptr(temp2_intf); |
| |
| Register G5_index = G5_method; |
| __ ld_ptr(member_vmindex, G5_index); |
| if (VerifyMethodHandles) { |
| Label L; |
| __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L); |
| __ STOP("invalid vtable index for MH.invokeInterface"); |
| __ bind(L); |
| } |
| |
| // 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: |
| G5_index, G5_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: |
| // G5_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(G5_method); |
| jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry); |
| |
| if (iid == vmIntrinsics::_linkToInterface) { |
| __ BIND(L_incompatible_class_change_error); |
| AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); |
| __ jump_to(icce, temp1); |
| __ delayed()->nop(); |
| } |
| } |
| } |
| |
| #ifndef PRODUCT |
| void trace_method_handle_stub(const char* adaptername, |
| oopDesc* mh, |
| intptr_t* saved_sp, |
| intptr_t* args, |
| intptr_t* tracing_fp) { |
| bool has_mh = (strstr(adaptername, "/static") == NULL && |
| strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH |
| const char* mh_reg_name = has_mh ? "G3_mh" : "G3"; |
| tty->print_cr("MH %s %s="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, |
| adaptername, mh_reg_name, |
| (intptr_t) mh, saved_sp, args); |
| |
| if (Verbose) { |
| // dumping last frame with frame::describe |
| |
| JavaThread* p = JavaThread::active(); |
| |
| ResourceMark rm; |
| PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here |
| FrameValues values; |
| |
| // Note: We want to allow trace_method_handle from any call site. |
| // While trace_method_handle creates a frame, it may be entered |
| // without a valid return PC in O7 (e.g. not just after a call). |
| // Walking that frame could lead to failures due to that invalid PC. |
| // => carefully detect that frame when doing the stack walking |
| |
| // walk up to the right frame using the "tracing_fp" argument |
| intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); |
| frame cur_frame(cur_sp, frame::unpatchable, NULL); |
| |
| while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) { |
| cur_frame = os::get_sender_for_C_frame(&cur_frame); |
| } |
| |
| // safely create a frame and call frame::describe |
| intptr_t *dump_sp = cur_frame.sender_sp(); |
| intptr_t *dump_fp = cur_frame.link(); |
| |
| bool walkable = has_mh; // whether the traced frame shoud be walkable |
| |
| // the sender for cur_frame is the caller of trace_method_handle |
| if (walkable) { |
| // The previous definition of walkable may have to be refined |
| // if new call sites cause the next frame constructor to start |
| // failing. Alternatively, frame constructors could be |
| // modified to support the current or future non walkable |
| // frames (but this is more intrusive and is not considered as |
| // part of this RFE, which will instead use a simpler output). |
| frame dump_frame = frame(dump_sp, |
| cur_frame.sp(), // younger_sp |
| false); // no adaptation |
| dump_frame.describe(values, 1); |
| } else { |
| // Robust dump for frames which cannot be constructed from sp/younger_sp |
| // Add descriptions without building a Java frame to avoid issues |
| values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); |
| values.describe(-1, dump_sp, "sp"); |
| } |
| |
| bool has_args = has_mh; // whether Gargs is meaningful |
| |
| // mark args, if seems valid (may not be valid for some adapters) |
| if (has_args) { |
| if ((args >= dump_sp) && (args < dump_fp)) { |
| values.describe(-1, args, "*G4_args"); |
| } |
| } |
| |
| // mark saved_sp, if seems valid (may not be valid for some adapters) |
| intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp); |
| const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP); |
| if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) { |
| values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS"); |
| } |
| |
| // Note: the unextended_sp may not be correct |
| tty->print_cr(" stack layout:"); |
| values.print(p); |
| if (has_mh && mh->is_oop()) { |
| mh->print(); |
| if (java_lang_invoke_MethodHandle::is_instance(mh)) { |
| if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) |
| java_lang_invoke_MethodHandle::form(mh)->print(); |
| } |
| } |
| } |
| } |
| |
| void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { |
| if (!TraceMethodHandles) return; |
| BLOCK_COMMENT("trace_method_handle {"); |
| // save: Gargs, O5_savedSP |
| __ save_frame(16); // need space for saving required FPU state |
| |
| __ set((intptr_t) adaptername, O0); |
| __ mov(G3_method_handle, O1); |
| __ mov(I5_savedSP, O2); |
| __ mov(Gargs, O3); |
| __ mov(I6, O4); // frame identifier for safe stack walking |
| |
| // Save scratched registers that might be needed. Robustness is more |
| // important than optimizing the saves for this debug only code. |
| |
| // save FP result, valid at some call sites (adapter_opt_return_float, ...) |
| Address d_save(FP, -sizeof(jdouble) + STACK_BIAS); |
| __ stf(FloatRegisterImpl::D, Ftos_d, d_save); |
| // Safely save all globals but G2 (handled by call_VM_leaf) and G7 |
| // (OS reserved). |
| __ mov(G3_method_handle, L3); |
| __ mov(Gargs, L4); |
| __ mov(G5_method_type, L5); |
| __ mov(G6, L6); |
| __ mov(G1, L1); |
| |
| __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub)); |
| |
| __ mov(L3, G3_method_handle); |
| __ mov(L4, Gargs); |
| __ mov(L5, G5_method_type); |
| __ mov(L6, G6); |
| __ mov(L1, G1); |
| __ ldf(FloatRegisterImpl::D, d_save, Ftos_d); |
| |
| __ restore(); |
| BLOCK_COMMENT("} trace_method_handle"); |
| } |
| #endif // PRODUCT |
