9c458decf5
Add src/cpu/aarch64/vm/* interpreter, shared runtime files. Reviewed-by: kvn, roland, coleenp, twisti
127 lines
4.6 KiB
C++
127 lines
4.6 KiB
C++
/*
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* Copyright (c) 2004, 2012, 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 "memory/metaspaceShared.hpp"
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// Generate the self-patching vtable method:
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//
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// This method will be called (as any other Klass virtual method) with
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// the Klass itself as the first argument. Example:
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//
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// oop obj;
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// int size = obj->klass()->oop_size(this);
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//
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// for which the virtual method call is Klass::oop_size();
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//
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// The dummy method is called with the Klass object as the first
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// operand, and an object as the second argument.
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//
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//=====================================================================
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// All of the dummy methods in the vtable are essentially identical,
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// differing only by an ordinal constant, and they bear no relationship
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// to the original method which the caller intended. Also, there needs
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// to be 'vtbl_list_size' instances of the vtable in order to
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// differentiate between the 'vtable_list_size' original Klass objects.
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#define __ masm->
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extern "C" {
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void aarch64_prolog(void);
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}
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void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
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void** vtable,
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char** md_top,
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char* md_end,
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char** mc_top,
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char* mc_end) {
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#ifdef BUILTIN_SIM
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// Write a dummy word to the writable shared metaspace.
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// MetaspaceShared::initialize_shared_spaces will fill it with the
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// address of aarch64_prolog().
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address *prolog_ptr = (address*)*md_top;
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*(intptr_t *)(*md_top) = (intptr_t)0;
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(*md_top) += sizeof(intptr_t);
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#endif
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intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
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*(intptr_t *)(*md_top) = vtable_bytes;
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*md_top += sizeof(intptr_t);
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void** dummy_vtable = (void**)*md_top;
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*vtable = dummy_vtable;
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*md_top += vtable_bytes;
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// Get ready to generate dummy methods.
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CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
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MacroAssembler* masm = new MacroAssembler(&cb);
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Label common_code;
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for (int i = 0; i < vtbl_list_size; ++i) {
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for (int j = 0; j < num_virtuals; ++j) {
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dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
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// We're called directly from C code.
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#ifdef BUILTIN_SIM
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__ c_stub_prolog(8, 0, MacroAssembler::ret_type_integral, prolog_ptr);
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#endif
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// Load rscratch1 with a value indicating vtable/offset pair.
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// -- bits[ 7..0] (8 bits) which virtual method in table?
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// -- bits[12..8] (5 bits) which virtual method table?
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__ mov(rscratch1, (i << 8) + j);
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__ b(common_code);
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}
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}
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__ bind(common_code);
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Register tmp0 = r10, tmp1 = r11; // AAPCS64 temporary registers
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__ enter();
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__ lsr(tmp0, rscratch1, 8); // isolate vtable identifier.
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__ mov(tmp1, (address)vtbl_list); // address of list of vtable pointers.
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__ ldr(tmp1, Address(tmp1, tmp0, Address::lsl(LogBytesPerWord))); // get correct vtable pointer.
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__ str(tmp1, Address(c_rarg0)); // update vtable pointer in obj.
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__ add(rscratch1, tmp1, rscratch1, ext::uxtb, LogBytesPerWord); // address of real method pointer.
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__ ldr(rscratch1, Address(rscratch1)); // get real method pointer.
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__ blrt(rscratch1, 8, 0, 1); // jump to the real method.
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__ leave();
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__ ret(lr);
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*mc_top = (char*)__ pc();
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}
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#ifdef BUILTIN_SIM
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void MetaspaceShared::relocate_vtbl_list(char **buffer) {
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void **sim_entry = (void**)*buffer;
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*sim_entry = (void*)aarch64_prolog;
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*buffer += sizeof(intptr_t);
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}
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#endif
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