--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/s390/vm/methodHandles_s390.cpp Thu Oct 13 14:49:34 2016 +0200
@@ -0,0 +1,635 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016 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 "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"
+
+#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);
+ KlassHandle 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())));
+ __ 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.
+ __ z_lg(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.
+ 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::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);
+ 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);
+ }
+ __ z_lg(Z_method, member_vmtarget);
+ method_is_live = true;
+ break;
+
+ case vmIntrinsics::_linkToStatic:
+ if (VerifyMethodHandles) {
+ verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
+ }
+ __ z_lg(Z_method, member_vmtarget);
+ 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);
+ 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, noreg,
+ 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 && 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 argument registers (they are used in raise exception stub).
+ __ z_stg(Z_ARG1, Address(Z_SP, 16));
+ __ z_stg(Z_ARG2, Address(Z_SP, 24));
+ __ z_stg(Z_ARG3, Address(Z_SP, 32));
+ __ z_stg(Z_ARG4, Address(Z_SP, 40));
+ __ z_stg(Z_ARG5, Address(Z_SP, 48));
+
+ // 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
+ __ z_lg(Z_ARG1, Address(Z_SP, 16));
+ __ z_lg(Z_ARG2, Address(Z_SP, 24));
+ __ z_lg(Z_ARG3, Address(Z_SP, 32));
+ __ z_lg(Z_ARG4, Address(Z_SP, 40));
+ __ z_lg(Z_ARG5, Address(Z_SP, 45));
+ __ 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