--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/sparc/methodHandles_sparc.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,613 @@
+/*
+ * Copyright (c) 2008, 2017, 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 "classfile/javaClasses.inline.hpp"
+#include "interpreter/interpreter.hpp"
+#include "interpreter/interp_masm.hpp"
+#include "memory/allocation.inline.hpp"
+#include "memory/resourceArea.hpp"
+#include "prims/jvm.h"
+#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, "%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) {
+ InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
+ Klass* 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);
+ __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp);
+ __ verify_oop(method_temp);
+ __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::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) {
+ assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
+
+ Label L;
+ BLOCK_COMMENT("verify_intrinsic_id {");
+ __ lduh(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::method_offset_in_bytes()));
+ Address vmtarget_method( G5_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, 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);
+ }
+ __ load_heap_oop(member_vmtarget, G5_method);
+ __ ld_ptr(vmtarget_method, G5_method);
+ break;
+
+ case vmIntrinsics::_linkToStatic:
+ if (VerifyMethodHandles) {
+ verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
+ }
+ __ load_heap_oop(member_vmtarget, G5_method);
+ __ ld_ptr(vmtarget_method, 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("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,
+ p2i(mh), p2i(saved_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 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 && 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;
+ 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