| /* |
| * Copyright (c) 1997, 2014, 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 "interpreter/interpreterRuntime.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "prims/methodHandles.hpp" |
| |
| PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| |
| #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 ":") |
| |
| 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"); |
| __ movptr(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, 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, SystemDictionary::WKID klass_id, |
| const char* error_message) { |
| Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
| KlassHandle klass = SystemDictionary::well_known_klass(klass_id); |
| Register temp = rdi; |
| Register temp2 = noreg; |
| LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr |
| Label L_ok, L_bad; |
| BLOCK_COMMENT("verify_klass {"); |
| __ verify_oop(obj); |
| __ testptr(obj, obj); |
| __ jcc(Assembler::zero, L_bad); |
| __ push(temp); if (temp2 != noreg) __ push(temp2); |
| #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); } |
| __ load_klass(temp, obj); |
| __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
| __ jcc(Assembler::equal, L_ok); |
| intptr_t super_check_offset = klass->super_check_offset(); |
| __ movptr(temp, Address(temp, super_check_offset)); |
| __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
| __ jcc(Assembler::equal, L_ok); |
| UNPUSH; |
| __ bind(L_bad); |
| __ STOP(error_message); |
| __ BIND(L_ok); |
| UNPUSH; |
| 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 {"); |
| __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); |
| __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); |
| __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); |
| __ cmpl(temp, ref_kind); |
| __ jcc(Assembler::equal, 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 temp, |
| bool for_compiler_entry) { |
| assert(method == rbx, "interpreter calling convention"); |
| |
| Label L_no_such_method; |
| __ testptr(rbx, rbx); |
| __ jcc(Assembler::zero, 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. |
| #ifdef _LP64 |
| Register rthread = r15_thread; |
| #else |
| Register rthread = temp; |
| __ get_thread(rthread); |
| #endif |
| // interp_only is an int, on little endian it is sufficient to test the byte only |
| // Is a cmpl faster? |
| __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0); |
| __ jccb(Assembler::zero, run_compiled_code); |
| __ jmp(Address(method, Method::interpreter_entry_offset())); |
| __ BIND(run_compiled_code); |
| } |
| |
| const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : |
| Method::from_interpreted_offset(); |
| __ jmp(Address(method, entry_offset)); |
| |
| __ bind(L_no_such_method); |
| __ 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 == rbx, "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()))); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); |
| __ verify_oop(method_temp); |
| // the following assumes that a Method* is normally compressed in the vmtarget field: |
| __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()))); |
| |
| if (VerifyMethodHandles && !for_compiler_entry) { |
| // make sure recv is already on stack |
| __ movptr(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; |
| __ cmpptr(recv, __ argument_address(temp2, -1)); |
| __ jcc(Assembler::equal, L); |
| __ movptr(rax, __ argument_address(temp2, -1)); |
| __ STOP("receiver not on stack"); |
| __ 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(); // empty stubs make SG sick |
| return NULL; |
| } |
| |
| // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) |
| // rbx: Method* |
| // rdx: argument locator (parameter slot count, added to rsp) |
| // rcx: used as temp to hold mh or receiver |
| // rax, rdi: garbage temps, blown away |
| Register rdx_argp = rdx; // argument list ptr, live on error paths |
| Register rax_temp = rax; |
| Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled |
| Register rbx_method = rbx; // eventual target of this invocation |
| |
| // here's where control starts out: |
| __ align(CodeEntryAlignment); |
| address entry_point = __ pc(); |
| |
| if (VerifyMethodHandles) { |
| Label L; |
| BLOCK_COMMENT("verify_intrinsic_id {"); |
| __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); |
| __ jcc(Assembler::equal, 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 rdx_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)) { |
| __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); |
| __ load_sized_value(rdx_argp, |
| Address(rdx_argp, ConstMethod::size_of_parameters_offset()), |
| sizeof(u2), /*is_signed*/ false); |
| // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
| rdx_first_arg_addr = __ argument_address(rdx_argp, -1); |
| } else { |
| DEBUG_ONLY(rdx_argp = noreg); |
| } |
| |
| if (!is_signature_polymorphic_static(iid)) { |
| __ movptr(rcx_mh, rdx_first_arg_addr); |
| DEBUG_ONLY(rdx_argp = noreg); |
| } |
| |
| // rdx_first_arg_addr is live! |
| |
| trace_method_handle_interpreter_entry(_masm, iid); |
| |
| if (iid == vmIntrinsics::_invokeBasic) { |
| generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); |
| |
| } else { |
| // Adjust argument list by popping the trailing MemberName argument. |
| Register rcx_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. |
| __ movptr(rcx_recv = rcx, rdx_first_arg_addr); |
| } |
| DEBUG_ONLY(rdx_argp = noreg); |
| Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now |
| __ pop(rax_temp); // return address |
| __ pop(rbx_member); // extract last argument |
| __ push(rax_temp); // re-push return address |
| generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_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 rbx_method = rbx; // eventual target of this invocation |
| // temps used in this code are not used in *either* compiled or interpreted calling sequences |
| #ifdef _LP64 |
| Register temp1 = rscratch1; |
| Register temp2 = rscratch2; |
| Register temp3 = rax; |
| 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); |
| assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); |
| assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); |
| } |
| #else |
| Register temp1 = (for_compiler_entry ? rsi : rdx); |
| Register temp2 = rdi; |
| Register temp3 = rax; |
| if (for_compiler_entry) { |
| assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); |
| assert_different_registers(temp1, rcx, rdx); |
| assert_different_registers(temp2, rcx, rdx); |
| assert_different_registers(temp3, rcx, rdx); |
| } |
| #endif |
| else { |
| assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP |
| } |
| 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, rbx_method, 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! |
| __ 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 |
| // rsi/r13 - interpreter linkage (if interpreted) |
| // rcx, rdx, rsi, rdi, r8 - 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); |
| } |
| __ movptr(rbx_method, member_vmtarget); |
| break; |
| |
| case vmIntrinsics::_linkToStatic: |
| if (VerifyMethodHandles) { |
| verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); |
| } |
| __ movptr(rbx_method, 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; |
| __ movptr(temp2_index, member_vmindex); |
| |
| if (VerifyMethodHandles) { |
| Label L_index_ok; |
| __ cmpl(temp2_index, 0); |
| __ jcc(Assembler::greaterEqual, 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, rbx_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, 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 rbx_index = rbx_method; |
| __ movptr(rbx_index, member_vmindex); |
| if (VerifyMethodHandles) { |
| Label L; |
| __ cmpl(rbx_index, 0); |
| __ jcc(Assembler::greaterEqual, 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, temp3_intf, |
| // note: next two args must be the same: |
| rbx_index, rbx_method, |
| temp2, |
| 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: |
| // rbx_method |
| // rsi/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 rcx_recv be shifted out. |
| __ verify_method_ptr(rbx_method); |
| jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); |
| |
| if (iid == vmIntrinsics::_linkToInterface) { |
| __ bind(L_incompatible_class_change_error); |
| __ 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) { |
| // called as a leaf from native code: do not block the JVM! |
| bool has_mh = (strstr(adaptername, "/static") == NULL && |
| strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH |
| const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; |
| tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT, |
| adaptername, mh_reg_name, |
| (void *)mh, entry_sp); |
| |
| if (Verbose) { |
| tty->print_cr("Registers:"); |
| const int saved_regs_count = RegisterImpl::number_of_registers; |
| for (int i = 0; i < saved_regs_count; i++) { |
| Register r = as_Register(i); |
| // The registers are stored in reverse order on the stack (by pusha). |
| tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); |
| if ((i + 1) % 4 == 0) { |
| tty->cr(); |
| } else { |
| tty->print(", "); |
| } |
| } |
| tty->cr(); |
| |
| { |
| // 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 PC on the stack top (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 |
| |
| // Current C frame |
| frame cur_frame = os::current_frame(); |
| |
| // Robust search of trace_calling_frame (independant of inlining). |
| // Assumes saved_regs comes from a pusha in the trace_calling_frame. |
| assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); |
| frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); |
| while (trace_calling_frame.fp() < saved_regs) { |
| trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); |
| } |
| |
| // safely create a frame and call frame::describe |
| intptr_t *dump_sp = trace_calling_frame.sender_sp(); |
| intptr_t *dump_fp = trace_calling_frame.link(); |
| |
| bool walkable = has_mh; // whether the traced frame shoud be walkable |
| |
| 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, dump_fp); |
| dump_frame.describe(values, 1); |
| } else { |
| // Stack may not be walkable (invalid PC above FP): |
| // 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 for #1"); |
| } |
| values.describe(-1, entry_sp, "raw top of stack"); |
| |
| 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(); |
| } |
| } |
| } |
| } |
| |
| // 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) { |
| trace_method_handle_stub(args->adaptername, |
| args->mh, |
| args->saved_regs, |
| args->entry_sp); |
| } |
| |
| void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { |
| if (!TraceMethodHandles) return; |
| BLOCK_COMMENT("trace_method_handle {"); |
| __ enter(); |
| __ andptr(rsp, -16); // align stack if needed for FPU state |
| __ pusha(); |
| __ mov(rbx, rsp); // for retreiving saved_regs |
| // Note: saved_regs must be in the entered frame for the |
| // robust stack walking implemented in trace_method_handle_stub. |
| |
| // save FP result, valid at some call sites (adapter_opt_return_float, ...) |
| __ increment(rsp, -2 * wordSize); |
| if (UseSSE >= 2) { |
| __ movdbl(Address(rsp, 0), xmm0); |
| } else if (UseSSE == 1) { |
| __ movflt(Address(rsp, 0), xmm0); |
| } else { |
| __ fst_d(Address(rsp, 0)); |
| } |
| |
| // Incoming state: |
| // rcx: method handle |
| // |
| // To avoid calling convention issues, build a record on the stack |
| // and pass the pointer to that instead. |
| __ push(rbp); // entry_sp (with extra align space) |
| __ push(rbx); // pusha saved_regs |
| __ push(rcx); // mh |
| __ push(rcx); // slot for adaptername |
| __ movptr(Address(rsp, 0), (intptr_t) adaptername); |
| __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); |
| __ increment(rsp, sizeof(MethodHandleStubArguments)); |
| |
| if (UseSSE >= 2) { |
| __ movdbl(xmm0, Address(rsp, 0)); |
| } else if (UseSSE == 1) { |
| __ movflt(xmm0, Address(rsp, 0)); |
| } else { |
| __ fld_d(Address(rsp, 0)); |
| } |
| __ increment(rsp, 2 * wordSize); |
| |
| __ popa(); |
| __ leave(); |
| BLOCK_COMMENT("} trace_method_handle"); |
| } |
| #endif //PRODUCT |
