--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/aarch64/vm/methodHandles_aarch64.cpp Tue Jan 20 11:34:17 2015 -0800
@@ -0,0 +1,443 @@
+/*
+ * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, Red Hat Inc. 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"
+
+#define __ _masm->
+
+#ifdef PRODUCT
+#define BLOCK_COMMENT(str) /* nothing */
+#else
+#define BLOCK_COMMENT(str) __ block_comment(str)
+#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");
+ __ ldr(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 //PRODUCT
+
+#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 = rscratch2;
+ Register temp2 = rscratch1; // used by MacroAssembler::cmpptr
+ Label L_ok, L_bad;
+ BLOCK_COMMENT("verify_klass {");
+ __ verify_oop(obj);
+ __ cbz(obj, L_bad);
+ __ push(RegSet::of(temp, temp2), sp);
+ __ load_klass(temp, obj);
+ __ cmpptr(temp, ExternalAddress((address) klass_addr));
+ __ br(Assembler::EQ, L_ok);
+ intptr_t super_check_offset = klass->super_check_offset();
+ __ ldr(temp, Address(temp, super_check_offset));
+ __ cmpptr(temp, ExternalAddress((address) klass_addr));
+ __ br(Assembler::EQ, L_ok);
+ __ pop(RegSet::of(temp, temp2), sp);
+ __ bind(L_bad);
+ __ stop(error_message);
+ __ BIND(L_ok);
+ __ pop(RegSet::of(temp, temp2), sp);
+ BLOCK_COMMENT("} verify_klass");
+}
+
+void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { }
+
+#endif //ASSERT
+
+void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
+ bool for_compiler_entry) {
+ assert(method == rmethod, "interpreter calling convention");
+ Label L_no_such_method;
+ __ cbz(rmethod, 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.
+
+ __ ldrb(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
+ __ cbnz(rscratch1, run_compiled_code);
+ __ ldr(rscratch1, Address(method, Method::interpreter_entry_offset()));
+ __ br(rscratch1);
+ __ BIND(run_compiled_code);
+ }
+
+ const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
+ Method::from_interpreted_offset();
+ __ ldr(rscratch1,Address(method, entry_offset));
+ __ br(rscratch1);
+ __ bind(L_no_such_method);
+ __ far_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 == rmethod, "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:
+ __ ldr(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
+ __ ldr(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;
+ __ ldr(rscratch1, __ argument_address(temp2, -1));
+ __ cmp(recv, rscratch1);
+ __ br(Assembler::EQ, L);
+ __ ldr(r0, __ argument_address(temp2, -1));
+ __ hlt(0);
+ __ 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(0); // empty stubs make SG sick
+ return NULL;
+ }
+
+ // r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
+ // rmethod: Method*
+ // r3: argument locator (parameter slot count, added to rsp)
+ // r1: used as temp to hold mh or receiver
+ // r0, r11: garbage temps, blown away
+ Register argp = r3; // argument list ptr, live on error paths
+ Register temp = r0;
+ Register mh = r1; // MH receiver; dies quickly and is recycled
+
+ // here's where control starts out:
+ __ align(CodeEntryAlignment);
+ address entry_point = __ pc();
+
+ if (VerifyMethodHandles) {
+ Label L;
+ BLOCK_COMMENT("verify_intrinsic_id {");
+ __ ldrb(rscratch1, Address(rmethod, Method::intrinsic_id_offset_in_bytes()));
+ __ cmp(rscratch1, (int) iid);
+ __ br(Assembler::EQ, 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");
+ }
+ __ hlt(0);
+ __ bind(L);
+ BLOCK_COMMENT("} verify_intrinsic_id");
+ }
+
+ // First task: Find out how big the argument list is.
+ Address r3_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)) {
+ __ ldr(argp, Address(rmethod, Method::const_offset()));
+ __ load_sized_value(argp,
+ Address(argp, ConstMethod::size_of_parameters_offset()),
+ sizeof(u2), /*is_signed*/ false);
+ // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
+ r3_first_arg_addr = __ argument_address(argp, -1);
+ } else {
+ DEBUG_ONLY(argp = noreg);
+ }
+
+ if (!is_signature_polymorphic_static(iid)) {
+ __ ldr(mh, r3_first_arg_addr);
+ DEBUG_ONLY(argp = noreg);
+ }
+
+ // r3_first_arg_addr is live!
+
+ trace_method_handle_interpreter_entry(_masm, iid);
+ if (iid == vmIntrinsics::_invokeBasic) {
+ generate_method_handle_dispatch(_masm, iid, mh, noreg, not_for_compiler_entry);
+
+ } else {
+ // Adjust argument list by popping the trailing MemberName argument.
+ Register 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.
+ __ ldr(recv = r2, r3_first_arg_addr);
+ }
+ DEBUG_ONLY(argp = noreg);
+ Register rmember = rmethod; // MemberName ptr; incoming method ptr is dead now
+ __ pop(rmember); // extract last argument
+ generate_method_handle_dispatch(_masm, iid, recv, rmember, 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");
+ // temps used in this code are not used in *either* compiled or interpreted calling sequences
+ Register temp1 = r10;
+ Register temp2 = r11;
+ Register temp3 = r14; // r13 is live by this point: it contains the sender SP
+ 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, j_rarg6, j_rarg7);
+ assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
+ assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
+ }
+
+ 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, rmethod, 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!
+ __ hlt(0);
+ // __ 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
+ // r13 - interpreter linkage (if interpreted) ??? FIXME
+ // r1 ... r0 - 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);
+ }
+ __ ldr(rmethod, member_vmtarget);
+ break;
+
+ case vmIntrinsics::_linkToStatic:
+ if (VerifyMethodHandles) {
+ verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
+ }
+ __ ldr(rmethod, 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;
+ __ ldr(temp2_index, member_vmindex);
+
+ if (VerifyMethodHandles) {
+ Label L_index_ok;
+ __ cmpw(temp2_index, 0U);
+ __ br(Assembler::GE, L_index_ok);
+ __ hlt(0);
+ __ 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, rmethod);
+ 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 rindex = rmethod;
+ __ ldr(rindex, member_vmindex);
+ if (VerifyMethodHandles) {
+ Label L;
+ __ cmpw(rindex, 0U);
+ __ br(Assembler::GE, L);
+ __ hlt(0);
+ __ 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:
+ rindex, rmethod,
+ 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: rmethod, 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 r2_recv be shifted out.
+ __ verify_method_ptr(rmethod);
+ jump_from_method_handle(_masm, rmethod, temp1, for_compiler_entry);
+ if (iid == vmIntrinsics::_linkToInterface) {
+ __ bind(L_incompatible_class_change_error);
+ __ far_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) { }
+
+// 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) { }
+
+void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { }
+#endif //PRODUCT