--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/arm/vtableStubs_arm.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,222 @@
+/*
+ * Copyright (c) 2008, 2016, 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/assembler.hpp"
+#include "assembler_arm.inline.hpp"
+#include "code/vtableStubs.hpp"
+#include "interp_masm_arm.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/klassVtable.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "vmreg_arm.inline.hpp"
+#ifdef COMPILER2
+#include "opto/runtime.hpp"
+#endif
+
+// machine-dependent part of VtableStubs: create VtableStub of correct size and
+// initialize its code
+
+#define __ masm->
+
+#ifndef PRODUCT
+extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
+#endif
+
+VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
+ const int code_length = VtableStub::pd_code_size_limit(true);
+ VtableStub* s = new(code_length) VtableStub(true, vtable_index);
+ // Can be NULL if there is no free space in the code cache.
+ if (s == NULL) {
+ return NULL;
+ }
+
+ ResourceMark rm;
+ CodeBuffer cb(s->entry_point(), code_length);
+ MacroAssembler* masm = new MacroAssembler(&cb);
+
+ assert(VtableStub::receiver_location() == R0->as_VMReg(), "receiver expected in R0");
+
+ const Register tmp = Rtemp; // Rtemp OK, should be free at call sites
+
+ address npe_addr = __ pc();
+ __ load_klass(tmp, R0);
+
+ {
+ int entry_offset = in_bytes(Klass::vtable_start_offset()) + vtable_index * vtableEntry::size_in_bytes();
+ int method_offset = vtableEntry::method_offset_in_bytes() + entry_offset;
+
+ assert ((method_offset & (wordSize - 1)) == 0, "offset should be aligned");
+ int offset_mask = AARCH64_ONLY(0xfff << LogBytesPerWord) NOT_AARCH64(0xfff);
+ if (method_offset & ~offset_mask) {
+ __ add(tmp, tmp, method_offset & ~offset_mask);
+ }
+ __ ldr(Rmethod, Address(tmp, method_offset & offset_mask));
+ }
+
+ address ame_addr = __ pc();
+#ifdef AARCH64
+ __ ldr(tmp, Address(Rmethod, Method::from_compiled_offset()));
+ __ br(tmp);
+#else
+ __ ldr(PC, Address(Rmethod, Method::from_compiled_offset()));
+#endif // AARCH64
+
+ masm->flush();
+
+ if (PrintMiscellaneous && (WizardMode || Verbose)) {
+ tty->print_cr("vtable #%d at " PTR_FORMAT "[%d] left over: %d",
+ vtable_index, p2i(s->entry_point()),
+ (int)(s->code_end() - s->entry_point()),
+ (int)(s->code_end() - __ pc()));
+ }
+ guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+ // FIXME ARM: need correct 'slop' - below is x86 code
+ // shut the door on sizing bugs
+ //int slop = 8; // 32-bit offset is this much larger than a 13-bit one
+ //assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
+
+ s->set_exception_points(npe_addr, ame_addr);
+ return s;
+}
+
+VtableStub* VtableStubs::create_itable_stub(int itable_index) {
+ const int code_length = VtableStub::pd_code_size_limit(false);
+ VtableStub* s = new(code_length) VtableStub(false, itable_index);
+ // Can be NULL if there is no free space in the code cache.
+ if (s == NULL) {
+ return NULL;
+ }
+
+ ResourceMark rm;
+ CodeBuffer cb(s->entry_point(), code_length);
+ MacroAssembler* masm = new MacroAssembler(&cb);
+
+ assert(VtableStub::receiver_location() == R0->as_VMReg(), "receiver expected in R0");
+
+ // R0-R3 / R0-R7 registers hold the arguments and cannot be spoiled
+ const Register Rclass = AARCH64_ONLY(R9) NOT_AARCH64(R4);
+ const Register Rlength = AARCH64_ONLY(R10) NOT_AARCH64(R5);
+ const Register Rscan = AARCH64_ONLY(R11) NOT_AARCH64(R6);
+ const Register tmp = Rtemp;
+
+ assert_different_registers(Ricklass, Rclass, Rlength, Rscan, tmp);
+
+ // Calculate the start of itable (itable goes after vtable)
+ const int scale = exact_log2(vtableEntry::size_in_bytes());
+ address npe_addr = __ pc();
+ __ load_klass(Rclass, R0);
+ __ ldr_s32(Rlength, Address(Rclass, Klass::vtable_length_offset()));
+
+ __ add(Rscan, Rclass, in_bytes(Klass::vtable_start_offset()));
+ __ add(Rscan, Rscan, AsmOperand(Rlength, lsl, scale));
+
+ // Search through the itable for an interface equal to incoming Ricklass
+ // itable looks like [intface][offset][intface][offset][intface][offset]
+ const int entry_size = itableOffsetEntry::size() * HeapWordSize;
+ assert(itableOffsetEntry::interface_offset_in_bytes() == 0, "not added for convenience");
+
+ Label loop;
+ __ bind(loop);
+ __ ldr(tmp, Address(Rscan, entry_size, post_indexed));
+#ifdef AARCH64
+ Label found;
+ __ cmp(tmp, Ricklass);
+ __ b(found, eq);
+ __ cbnz(tmp, loop);
+#else
+ __ cmp(tmp, Ricklass); // set ZF and CF if interface is found
+ __ cmn(tmp, 0, ne); // check if tmp == 0 and clear CF if it is
+ __ b(loop, ne);
+#endif // AARCH64
+
+ assert(StubRoutines::throw_IncompatibleClassChangeError_entry() != NULL, "Check initialization order");
+#ifdef AARCH64
+ __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, tmp);
+ __ bind(found);
+#else
+ // CF == 0 means we reached the end of itable without finding icklass
+ __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, noreg, cc);
+#endif // !AARCH64
+
+ // Interface found at previous position of Rscan, now load the method oop
+ __ ldr_s32(tmp, Address(Rscan, itableOffsetEntry::offset_offset_in_bytes() - entry_size));
+ {
+ const int method_offset = itableMethodEntry::size() * HeapWordSize * itable_index +
+ itableMethodEntry::method_offset_in_bytes();
+ __ add_slow(Rmethod, Rclass, method_offset);
+ }
+ __ ldr(Rmethod, Address(Rmethod, tmp));
+
+ address ame_addr = __ pc();
+
+#ifdef AARCH64
+ __ ldr(tmp, Address(Rmethod, Method::from_compiled_offset()));
+ __ br(tmp);
+#else
+ __ ldr(PC, Address(Rmethod, Method::from_compiled_offset()));
+#endif // AARCH64
+
+ masm->flush();
+
+ if (PrintMiscellaneous && (WizardMode || Verbose)) {
+ tty->print_cr("itable #%d at " PTR_FORMAT "[%d] left over: %d",
+ itable_index, p2i(s->entry_point()),
+ (int)(s->code_end() - s->entry_point()),
+ (int)(s->code_end() - __ pc()));
+ }
+ guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+ // FIXME ARM: need correct 'slop' - below is x86 code
+ // shut the door on sizing bugs
+ //int slop = 8; // 32-bit offset is this much larger than a 13-bit one
+ //assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
+
+ s->set_exception_points(npe_addr, ame_addr);
+ return s;
+}
+
+int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
+ int instr_count;
+
+ if (is_vtable_stub) {
+ // vtable stub size
+ instr_count = NOT_AARCH64(4) AARCH64_ONLY(5);
+ } else {
+ // itable stub size
+ instr_count = NOT_AARCH64(20) AARCH64_ONLY(20);
+ }
+
+#ifdef AARCH64
+ if (UseCompressedClassPointers) {
+ instr_count += MacroAssembler::instr_count_for_decode_klass_not_null();
+ }
+#endif // AARCH64
+
+ return instr_count * Assembler::InstructionSize;
+}
+
+int VtableStub::pd_code_alignment() {
+ return 8;
+}