453 lines
18 KiB
C++
453 lines
18 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2014, Red Hat Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "interpreter/interpreter.hpp"
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#include "interpreter/interpreterRuntime.hpp"
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#include "memory/allocation.inline.hpp"
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#include "prims/methodHandles.hpp"
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#include "runtime/flags/flagSetting.hpp"
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#include "runtime/frame.inline.hpp"
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#define __ _masm->
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#ifdef PRODUCT
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#define BLOCK_COMMENT(str) /* nothing */
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#else
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#define BLOCK_COMMENT(str) __ block_comment(str)
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#endif
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#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
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void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
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if (VerifyMethodHandles)
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verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
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"MH argument is a Class");
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__ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
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}
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#ifdef ASSERT
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static int check_nonzero(const char* xname, int x) {
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assert(x != 0, "%s should be nonzero", xname);
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return x;
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}
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#define NONZERO(x) check_nonzero(#x, x)
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#else //ASSERT
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#define NONZERO(x) (x)
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#endif //PRODUCT
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#ifdef ASSERT
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void MethodHandles::verify_klass(MacroAssembler* _masm,
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Register obj, SystemDictionary::WKID klass_id,
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const char* error_message) {
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InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
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Klass* klass = SystemDictionary::well_known_klass(klass_id);
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Register temp = rscratch2;
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Register temp2 = rscratch1; // used by MacroAssembler::cmpptr
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Label L_ok, L_bad;
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BLOCK_COMMENT("verify_klass {");
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__ verify_oop(obj);
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__ cbz(obj, L_bad);
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__ push(RegSet::of(temp, temp2), sp);
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__ load_klass(temp, obj);
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__ cmpptr(temp, ExternalAddress((address) klass_addr));
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__ br(Assembler::EQ, L_ok);
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intptr_t super_check_offset = klass->super_check_offset();
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__ ldr(temp, Address(temp, super_check_offset));
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__ cmpptr(temp, ExternalAddress((address) klass_addr));
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__ br(Assembler::EQ, L_ok);
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__ pop(RegSet::of(temp, temp2), sp);
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__ bind(L_bad);
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__ stop(error_message);
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__ BIND(L_ok);
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__ pop(RegSet::of(temp, temp2), sp);
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BLOCK_COMMENT("} verify_klass");
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}
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void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { }
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#endif //ASSERT
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void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
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bool for_compiler_entry) {
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assert(method == rmethod, "interpreter calling convention");
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Label L_no_such_method;
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__ cbz(rmethod, L_no_such_method);
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__ verify_method_ptr(method);
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if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
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Label run_compiled_code;
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// JVMTI events, such as single-stepping, are implemented partly by avoiding running
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// compiled code in threads for which the event is enabled. Check here for
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// interp_only_mode if these events CAN be enabled.
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__ ldrb(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
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__ cbnz(rscratch1, run_compiled_code);
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__ ldr(rscratch1, Address(method, Method::interpreter_entry_offset()));
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__ br(rscratch1);
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__ BIND(run_compiled_code);
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}
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const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
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Method::from_interpreted_offset();
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__ ldr(rscratch1,Address(method, entry_offset));
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__ br(rscratch1);
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__ bind(L_no_such_method);
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__ far_jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
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}
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void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
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Register recv, Register method_temp,
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Register temp2,
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bool for_compiler_entry) {
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BLOCK_COMMENT("jump_to_lambda_form {");
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// This is the initial entry point of a lazy method handle.
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// After type checking, it picks up the invoker from the LambdaForm.
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assert_different_registers(recv, method_temp, temp2);
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assert(recv != noreg, "required register");
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assert(method_temp == rmethod, "required register for loading method");
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//NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
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// Load the invoker, as MH -> MH.form -> LF.vmentry
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__ verify_oop(recv);
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__ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
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__ verify_oop(method_temp);
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__ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
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__ verify_oop(method_temp);
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__ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
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__ verify_oop(method_temp);
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__ ldr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())));
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if (VerifyMethodHandles && !for_compiler_entry) {
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// make sure recv is already on stack
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__ ldr(temp2, Address(method_temp, Method::const_offset()));
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__ load_sized_value(temp2,
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Address(temp2, ConstMethod::size_of_parameters_offset()),
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sizeof(u2), /*is_signed*/ false);
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// assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
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Label L;
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__ ldr(rscratch1, __ argument_address(temp2, -1));
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__ cmp(recv, rscratch1);
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__ br(Assembler::EQ, L);
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__ ldr(r0, __ argument_address(temp2, -1));
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__ hlt(0);
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__ BIND(L);
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}
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jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
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BLOCK_COMMENT("} jump_to_lambda_form");
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}
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// Code generation
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address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
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vmIntrinsics::ID iid) {
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const bool not_for_compiler_entry = false; // this is the interpreter entry
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assert(is_signature_polymorphic(iid), "expected invoke iid");
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if (iid == vmIntrinsics::_invokeGeneric ||
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iid == vmIntrinsics::_compiledLambdaForm) {
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// Perhaps surprisingly, the symbolic references visible to Java are not directly used.
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// They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
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// They all allow an appendix argument.
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__ hlt(0); // empty stubs make SG sick
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return NULL;
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}
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// r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
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// rmethod: Method*
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// r3: argument locator (parameter slot count, added to rsp)
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// r1: used as temp to hold mh or receiver
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// r0, r11: garbage temps, blown away
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Register argp = r3; // argument list ptr, live on error paths
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Register temp = r0;
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Register mh = r1; // MH receiver; dies quickly and is recycled
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// here's where control starts out:
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__ align(CodeEntryAlignment);
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address entry_point = __ pc();
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if (VerifyMethodHandles) {
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assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
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Label L;
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BLOCK_COMMENT("verify_intrinsic_id {");
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__ ldrh(rscratch1, Address(rmethod, Method::intrinsic_id_offset_in_bytes()));
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__ cmp(rscratch1, (int) iid);
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__ br(Assembler::EQ, L);
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if (iid == vmIntrinsics::_linkToVirtual ||
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iid == vmIntrinsics::_linkToSpecial) {
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// could do this for all kinds, but would explode assembly code size
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trace_method_handle(_masm, "bad Method*::intrinsic_id");
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}
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__ hlt(0);
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__ bind(L);
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BLOCK_COMMENT("} verify_intrinsic_id");
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}
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// First task: Find out how big the argument list is.
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Address r3_first_arg_addr;
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int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
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assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
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if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
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__ ldr(argp, Address(rmethod, Method::const_offset()));
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__ load_sized_value(argp,
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Address(argp, ConstMethod::size_of_parameters_offset()),
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sizeof(u2), /*is_signed*/ false);
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// assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
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r3_first_arg_addr = __ argument_address(argp, -1);
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} else {
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DEBUG_ONLY(argp = noreg);
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}
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if (!is_signature_polymorphic_static(iid)) {
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__ ldr(mh, r3_first_arg_addr);
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DEBUG_ONLY(argp = noreg);
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}
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// r3_first_arg_addr is live!
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trace_method_handle_interpreter_entry(_masm, iid);
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if (iid == vmIntrinsics::_invokeBasic) {
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generate_method_handle_dispatch(_masm, iid, mh, noreg, not_for_compiler_entry);
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} else {
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// Adjust argument list by popping the trailing MemberName argument.
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Register recv = noreg;
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if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
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// Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
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__ ldr(recv = r2, r3_first_arg_addr);
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}
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DEBUG_ONLY(argp = noreg);
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Register rmember = rmethod; // MemberName ptr; incoming method ptr is dead now
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__ pop(rmember); // extract last argument
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generate_method_handle_dispatch(_masm, iid, recv, rmember, not_for_compiler_entry);
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}
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return entry_point;
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}
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void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
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vmIntrinsics::ID iid,
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Register receiver_reg,
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Register member_reg,
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bool for_compiler_entry) {
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assert(is_signature_polymorphic(iid), "expected invoke iid");
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// temps used in this code are not used in *either* compiled or interpreted calling sequences
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Register temp1 = r10;
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Register temp2 = r11;
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Register temp3 = r14; // r13 is live by this point: it contains the sender SP
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if (for_compiler_entry) {
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assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
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assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
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assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
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assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
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}
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assert_different_registers(temp1, temp2, temp3, receiver_reg);
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assert_different_registers(temp1, temp2, temp3, member_reg);
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if (iid == vmIntrinsics::_invokeBasic) {
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// indirect through MH.form.vmentry.vmtarget
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jump_to_lambda_form(_masm, receiver_reg, rmethod, temp1, for_compiler_entry);
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} else {
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// The method is a member invoker used by direct method handles.
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if (VerifyMethodHandles) {
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// make sure the trailing argument really is a MemberName (caller responsibility)
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verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
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"MemberName required for invokeVirtual etc.");
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}
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Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
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Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
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Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
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Address vmtarget_method( rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
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Register temp1_recv_klass = temp1;
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if (iid != vmIntrinsics::_linkToStatic) {
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__ verify_oop(receiver_reg);
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if (iid == vmIntrinsics::_linkToSpecial) {
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// Don't actually load the klass; just null-check the receiver.
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__ null_check(receiver_reg);
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} else {
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// load receiver klass itself
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__ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
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__ load_klass(temp1_recv_klass, receiver_reg);
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__ verify_klass_ptr(temp1_recv_klass);
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}
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BLOCK_COMMENT("check_receiver {");
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// The receiver for the MemberName must be in receiver_reg.
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// Check the receiver against the MemberName.clazz
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if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
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// Did not load it above...
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__ load_klass(temp1_recv_klass, receiver_reg);
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__ verify_klass_ptr(temp1_recv_klass);
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}
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if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
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Label L_ok;
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Register temp2_defc = temp2;
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__ load_heap_oop(temp2_defc, member_clazz);
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load_klass_from_Class(_masm, temp2_defc);
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__ verify_klass_ptr(temp2_defc);
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__ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
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// If we get here, the type check failed!
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__ hlt(0);
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// __ STOP("receiver class disagrees with MemberName.clazz");
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__ bind(L_ok);
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}
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BLOCK_COMMENT("} check_receiver");
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}
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if (iid == vmIntrinsics::_linkToSpecial ||
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iid == vmIntrinsics::_linkToStatic) {
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DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
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}
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// Live registers at this point:
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// member_reg - MemberName that was the trailing argument
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// temp1_recv_klass - klass of stacked receiver, if needed
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// r13 - interpreter linkage (if interpreted) ??? FIXME
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// r1 ... r0 - compiler arguments (if compiled)
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Label L_incompatible_class_change_error;
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switch (iid) {
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case vmIntrinsics::_linkToSpecial:
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if (VerifyMethodHandles) {
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verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
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}
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__ load_heap_oop(rmethod, member_vmtarget);
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__ ldr(rmethod, vmtarget_method);
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break;
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case vmIntrinsics::_linkToStatic:
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if (VerifyMethodHandles) {
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verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
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}
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__ load_heap_oop(rmethod, member_vmtarget);
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__ ldr(rmethod, vmtarget_method);
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break;
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case vmIntrinsics::_linkToVirtual:
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{
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// same as TemplateTable::invokevirtual,
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// minus the CP setup and profiling:
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if (VerifyMethodHandles) {
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verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
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}
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// pick out the vtable index from the MemberName, and then we can discard it:
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Register temp2_index = temp2;
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__ ldr(temp2_index, member_vmindex);
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if (VerifyMethodHandles) {
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Label L_index_ok;
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__ cmpw(temp2_index, 0U);
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__ br(Assembler::GE, L_index_ok);
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__ hlt(0);
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__ BIND(L_index_ok);
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}
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// Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
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// at this point. And VerifyMethodHandles has already checked clazz, if needed.
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// get target Method* & entry point
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__ lookup_virtual_method(temp1_recv_klass, temp2_index, rmethod);
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break;
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}
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case vmIntrinsics::_linkToInterface:
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{
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// same as TemplateTable::invokeinterface
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// (minus the CP setup and profiling, with different argument motion)
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if (VerifyMethodHandles) {
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verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
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}
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Register temp3_intf = temp3;
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__ load_heap_oop(temp3_intf, member_clazz);
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load_klass_from_Class(_masm, temp3_intf);
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__ verify_klass_ptr(temp3_intf);
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Register rindex = rmethod;
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__ ldr(rindex, member_vmindex);
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if (VerifyMethodHandles) {
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Label L;
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__ cmpw(rindex, 0U);
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__ br(Assembler::GE, L);
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__ hlt(0);
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__ bind(L);
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}
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// given intf, index, and recv klass, dispatch to the implementation method
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__ lookup_interface_method(temp1_recv_klass, temp3_intf,
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// note: next two args must be the same:
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rindex, rmethod,
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temp2,
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L_incompatible_class_change_error);
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break;
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}
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default:
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fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
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break;
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}
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// live at this point: rmethod, r13 (if interpreted)
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// After figuring out which concrete method to call, jump into it.
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// Note that this works in the interpreter with no data motion.
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// But the compiled version will require that r2_recv be shifted out.
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__ verify_method_ptr(rmethod);
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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
|