| /* |
| * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2016, 2017, SAP SE. 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 "jvm.h" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "classfile/javaClasses.inline.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "prims/methodHandles.hpp" |
| #include "runtime/frame.inline.hpp" |
| #include "utilities/preserveException.hpp" |
| |
| #ifdef PRODUCT |
| #define __ _masm-> |
| #define BLOCK_COMMENT(str) /* nothing */ |
| #else |
| #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)-> |
| #define BLOCK_COMMENT(str) __ block_comment(str) |
| #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"); |
| } |
| __ z_lg(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 |
| #define NONZERO(x) (x) |
| #endif |
| |
| #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) { |
| |
| InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
| Klass* klass = SystemDictionary::well_known_klass(klass_id); |
| |
| assert(temp_reg != Z_R0 && // Is used as base register! |
| temp_reg != noreg && temp2_reg != noreg, "need valid registers!"); |
| |
| NearLabel L_ok, L_bad; |
| |
| BLOCK_COMMENT("verify_klass {"); |
| |
| __ verify_oop(obj_reg); |
| __ compareU64_and_branch(obj_reg, (intptr_t)0L, Assembler::bcondEqual, L_bad); |
| __ load_klass(temp_reg, obj_reg); |
| // klass_addr is a klass in allstatic SystemDictionaryHandles. Can't get GCed. |
| __ load_const_optimized(temp2_reg, (address)klass_addr); |
| __ z_lg(temp2_reg, Address(temp2_reg)); |
| __ compareU64_and_branch(temp_reg, temp2_reg, Assembler::bcondEqual, L_ok); |
| |
| intptr_t super_check_offset = klass->super_check_offset(); |
| __ z_lg(temp_reg, Address(temp_reg, super_check_offset)); |
| __ compareU64_and_branch(temp_reg, temp2_reg, Assembler::bcondEqual, L_ok); |
| __ BIND(L_bad); |
| __ stop(error_message); |
| __ BIND(L_ok); |
| |
| BLOCK_COMMENT("} verify_klass"); |
| } |
| |
| void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, |
| Register member_reg, Register temp ) { |
| NearLabel L; |
| BLOCK_COMMENT("verify_ref_kind {"); |
| |
| __ z_llgf(temp, |
| Address(member_reg, |
| NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); |
| __ z_srl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); |
| __ z_nilf(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); |
| __ compare32_and_branch(temp, constant(ref_kind), Assembler::bcondEqual, 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) { |
| assert(method == Z_method, "interpreter calling convention"); |
| __ verify_method_ptr(method); |
| |
| assert(target != method, "don 't you kill the method reg!"); |
| |
| Label L_no_such_method; |
| |
| if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { |
| // 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(); |
| |
| Label run_compiled_code; |
| |
| __ load_and_test_int(temp, Address(Z_thread, JavaThread::interp_only_mode_offset())); |
| __ z_bre(run_compiled_code); |
| |
| // Null method test is replicated below in compiled case, |
| // it might be able to address across the verify_thread(). |
| __ z_ltgr(temp, method); |
| __ z_bre(L_no_such_method); |
| |
| __ z_lg(target, Address(method, Method::interpreter_entry_offset())); |
| __ z_br(target); |
| |
| __ bind(run_compiled_code); |
| } |
| |
| // Compiled case, either static or fall-through from runtime conditional. |
| __ z_ltgr(temp, method); |
| __ z_bre(L_no_such_method); |
| |
| ByteSize offset = for_compiler_entry ? |
| Method::from_compiled_offset() : Method::from_interpreted_offset(); |
| Address method_from(method, offset); |
| |
| __ z_lg(target, method_from); |
| __ z_br(target); |
| |
| __ bind(L_no_such_method); |
| assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!"); |
| __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry()); |
| __ z_br(target); |
| } |
| |
| void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, |
| Register recv, Register method_temp, |
| Register temp2, Register temp3, |
| bool for_compiler_entry) { |
| |
| // 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); |
| assert(method_temp == Z_method, "required register for loading method"); |
| |
| BLOCK_COMMENT("jump_to_lambda_form {"); |
| |
| // 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())), |
| noreg, noreg, IS_NOT_NULL); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(method_temp, |
| Address(method_temp, |
| NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), |
| noreg, noreg, IS_NOT_NULL); |
| __ verify_oop(method_temp); |
| __ load_heap_oop(method_temp, |
| Address(method_temp, |
| NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), |
| noreg, noreg, IS_NOT_NULL); |
| __ verify_oop(method_temp); |
| __ z_lg(method_temp, |
| Address(method_temp, |
| NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()))); |
| |
| if (VerifyMethodHandles && !for_compiler_entry) { |
| // Make sure recv is already on stack. |
| NearLabel L; |
| Address paramSize(temp2, ConstMethod::size_of_parameters_offset()); |
| |
| __ z_lg(temp2, Address(method_temp, Method::const_offset())); |
| __ load_sized_value(temp2, paramSize, sizeof(u2), /*is_signed*/ false); |
| // if (temp2 != recv) stop |
| __ z_lg(temp2, __ argument_address(temp2, temp2, 0)); |
| __ compare64_and_branch(temp2, recv, Assembler::bcondEqual, L); |
| __ stop("receiver not on stack"); |
| __ BIND(L); |
| } |
| |
| jump_from_method_handle(_masm, method_temp, temp2, Z_R0, 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; |
| } |
| |
| // Z_R10: sender SP (must preserve; see prepare_to_jump_from_interprted) |
| // Z_method: method |
| // Z_ARG1 (Gargs): incoming argument list (must preserve) |
| Register Z_R4_param_size = Z_R4; // size of parameters |
| address code_start = __ pc(); |
| |
| // Here is where control starts out: |
| __ align(CodeEntryAlignment); |
| |
| address entry_point = __ pc(); |
| |
| if (VerifyMethodHandles) { |
| Label L; |
| BLOCK_COMMENT("verify_intrinsic_id {"); |
| |
| // Supplement to 8139891: _intrinsic_id exceeded 1-byte size limit. |
| if (Method::intrinsic_id_size_in_bytes() == 1) { |
| __ z_cli(Address(Z_method, Method::intrinsic_id_offset_in_bytes()), (int)iid); |
| } else { |
| assert(Method::intrinsic_id_size_in_bytes() == 2, "size error: check Method::_intrinsic_id"); |
| __ z_lh(Z_R0_scratch, Address(Z_method, Method::intrinsic_id_offset_in_bytes())); |
| __ z_chi(Z_R0_scratch, (int)iid); |
| } |
| __ z_bre(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 Z_R4_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)) { |
| Address paramSize(Z_R1_scratch, ConstMethod::size_of_parameters_offset()); |
| |
| __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset())); |
| __ load_sized_value(Z_R4_param_size, paramSize, sizeof(u2), /*is_signed*/ false); |
| Z_R4_first_arg_addr = __ argument_address(Z_R4_param_size, Z_R4_param_size, 0); |
| } else { |
| DEBUG_ONLY(Z_R4_param_size = noreg); |
| } |
| |
| Register Z_mh = noreg; |
| if (!is_signature_polymorphic_static(iid)) { |
| Z_mh = Z_ARG4; |
| __ z_lg(Z_mh, Z_R4_first_arg_addr); |
| DEBUG_ONLY(Z_R4_param_size = noreg); |
| } |
| |
| // Z_R4_first_arg_addr is live! |
| |
| trace_method_handle_interpreter_entry(_masm, iid); |
| |
| if (iid == vmIntrinsics::_invokeBasic) { |
| __ pc(); // just for the block comment |
| generate_method_handle_dispatch(_masm, iid, Z_mh, noreg, not_for_compiler_entry); |
| } else { |
| // Adjust argument list by popping the trailing MemberName argument. |
| Register Z_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. |
| __ z_lg(Z_recv = Z_R5, Z_R4_first_arg_addr); |
| DEBUG_ONLY(Z_R4_param_size = noreg); |
| } |
| |
| Register Z_member = Z_method; // MemberName ptr; incoming method ptr is dead now |
| |
| __ z_lg(Z_member, __ argument_address(constant(1))); |
| __ add2reg(Z_esp, Interpreter::stackElementSize); |
| generate_method_handle_dispatch(_masm, iid, Z_recv, Z_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 ? Z_R10 : Z_R6; |
| Register temp2 = Z_R12; |
| Register temp3 = Z_R11; |
| Register temp4 = Z_R13; |
| |
| if (for_compiler_entry) { |
| assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : Z_ARG1), |
| "only valid assignment"); |
| } |
| 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 (!for_compiler_entry) { // Don't trash last SP. |
| assert_different_registers(temp1, temp2, temp3, temp4, Z_R10); |
| } |
| |
| if (iid == vmIntrinsics::_invokeBasic) { |
| __ pc(); // Just for the block comment. |
| // Indirect through MH.form.vmentry.vmtarget. |
| jump_to_lambda_form(_masm, receiver_reg, Z_method, Z_R1, temp3, for_compiler_entry); |
| return; |
| } |
| |
| // 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::method_offset_in_bytes())); |
| Address vmtarget_method(Z_method, 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, Z_R0, 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) { |
| NearLabel L_ok; |
| Register temp2_defc = temp2; |
| |
| __ load_heap_oop(temp2_defc, member_clazz, |
| noreg, noreg, IS_NOT_NULL); |
| 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. |
| // Z_R10 - Interpreter linkage if interpreted. |
| |
| bool method_is_live = false; |
| |
| switch (iid) { |
| case vmIntrinsics::_linkToSpecial: |
| if (VerifyMethodHandles) { |
| verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); |
| } |
| __ load_heap_oop(Z_method, member_vmtarget, |
| noreg, noreg, IS_NOT_NULL); |
| __ z_lg(Z_method, vmtarget_method); |
| method_is_live = true; |
| break; |
| |
| case vmIntrinsics::_linkToStatic: |
| if (VerifyMethodHandles) { |
| verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); |
| } |
| __ load_heap_oop(Z_method, member_vmtarget, |
| noreg, noreg, IS_NOT_NULL); |
| __ z_lg(Z_method, vmtarget_method); |
| method_is_live = true; |
| 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; |
| __ z_lg(temp2_index, member_vmindex); |
| |
| if (VerifyMethodHandles) { |
| // if (member_vmindex < 0) stop |
| NearLabel L_index_ok; |
| __ compare32_and_branch(temp2_index, constant(0), Assembler::bcondNotLow, 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 and entry point. |
| __ lookup_virtual_method(temp1_recv_klass, temp2_index, Z_method); |
| method_is_live = true; |
| 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, |
| noreg, noreg, IS_NOT_NULL); |
| load_klass_from_Class(_masm, temp3_intf, temp2, temp4); |
| |
| Register Z_index = Z_method; |
| |
| __ z_lg(Z_index, member_vmindex); |
| |
| if (VerifyMethodHandles) { |
| NearLabel L; |
| // if (member_vmindex < 0) stop |
| __ compare32_and_branch(Z_index, constant(0), Assembler::bcondNotLow, L); |
| __ stop("invalid vtable index for MH.invokeInterface"); |
| __ bind(L); |
| } |
| |
| // Given interface, index, and recv klass, dispatch to the implementation method. |
| Label L_no_such_interface; |
| __ lookup_interface_method(temp1_recv_klass, temp3_intf, |
| // Note: next two args must be the same: |
| Z_index, Z_method, temp2, |
| L_no_such_interface); |
| jump_from_method_handle(_masm, Z_method, temp2, Z_R0, for_compiler_entry); |
| |
| __ bind(L_no_such_interface); |
| |
| // Throw exception. |
| __ load_const_optimized(Z_R1, StubRoutines::throw_IncompatibleClassChangeError_entry()); |
| __ z_br(Z_R1); |
| break; |
| } |
| |
| default: |
| fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); |
| break; |
| } |
| |
| if (method_is_live) { |
| // Live at this point: Z_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. |
| jump_from_method_handle(_masm, Z_method, temp1, Z_R0, for_compiler_entry); |
| } |
| } |
| |
| #ifndef PRODUCT |
| void trace_method_handle_stub(const char* adaptername, |
| oopDesc* mh, |
| intptr_t* sender_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 ? "Z_R4_mh" : "Z_R4"; |
| tty->print_cr("MH %s %s=" INTPTR_FORMAT " sender_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, |
| adaptername, mh_reg_name, |
| p2i(mh), p2i(sender_sp), p2i(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 Z_R14 (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. |
| frame cur_frame = os::current_frame(); // Current C frame. |
| |
| while (cur_frame.fp() != 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); |
| 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 Z_esp 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, "*Z_esp"); |
| } |
| } |
| |
| // Note: the unextended_sp may not be correct. |
| tty->print_cr(" stack layout:"); |
| values.print(p); |
| if (has_mh && oopDesc::is_oop(mh)) { |
| 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; } |
| |
| // If arg registers are contiguous, we can use STMG/LMG. |
| assert((Z_ARG5->encoding() - Z_ARG1->encoding() + 1) == RegisterImpl::number_of_arg_registers, "Oops"); |
| |
| BLOCK_COMMENT("trace_method_handle {"); |
| |
| // Save argument registers (they are used in raise exception stub). |
| // Argument registers have contiguous register numbers -> we can use stmg/lmg. |
| __ z_stmg(Z_ARG1, Z_ARG5, 16, Z_SP); |
| |
| // Setup arguments. |
| __ z_lgr(Z_ARG2, Z_ARG4); // mh, see generate_method_handle_interpreter_entry() |
| __ z_lgr(Z_ARG3, Z_R10); // sender_sp |
| __ z_lgr(Z_ARG4, Z_esp); |
| __ load_const_optimized(Z_ARG1, (void *)adaptername); |
| __ z_lgr(Z_ARG5, Z_SP); // tracing_fp |
| __ save_return_pc(); // saves Z_R14 |
| __ push_frame_abi160(0); |
| __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub)); |
| __ pop_frame(); |
| __ restore_return_pc(); // restores to Z_R14 |
| |
| // Restore argument registers |
| __ z_lmg(Z_ARG1, Z_ARG5, 16, Z_SP); |
| __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, 50, -1); |
| __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, -1, 5); |
| |
| BLOCK_COMMENT("} trace_method_handle"); |
| } |
| #endif // !PRODUCT |
