Mercurial > hg > graal-compiler
view src/cpu/sparc/vm/metaspaceShared_sparc.cpp @ 18092:9e2bb00a8191 jdk8u25-b11
Merge
author | coffeys |
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date | Fri, 01 Aug 2014 10:16:39 +0100 |
parents | f0c2369fda5a |
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/* * Copyright (c) 2004, 2012, 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.inline.hpp" #include "asm/codeBuffer.hpp" #include "memory/metaspaceShared.hpp" // Generate the self-patching vtable method: // // This method will be called (as any other Klass virtual method) with // the Klass itself as the first argument. Example: // // oop obj; // int size = obj->klass()->oop_size(this); // // for which the virtual method call is Klass::oop_size(); // // The dummy method is called with the Klass object as the first // operand, and an object as the second argument. // //===================================================================== // All of the dummy methods in the vtable are essentially identical, // differing only by an ordinal constant, and they bear no relationship // to the original method which the caller intended. Also, there needs // to be 'vtbl_list_size' instances of the vtable in order to // differentiate between the 'vtable_list_size' original Klass objects. #define __ masm-> void MetaspaceShared::generate_vtable_methods(void** vtbl_list, void** vtable, char** md_top, char* md_end, char** mc_top, char* mc_end) { intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*); *(intptr_t *)(*md_top) = vtable_bytes; *md_top += sizeof(intptr_t); void** dummy_vtable = (void**)*md_top; *vtable = dummy_vtable; *md_top += vtable_bytes; guarantee(*md_top <= md_end, "Insufficient space for vtables."); // Get ready to generate dummy methods. CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top); MacroAssembler* masm = new MacroAssembler(&cb); Label common_code; for (int i = 0; i < vtbl_list_size; ++i) { for (int j = 0; j < num_virtuals; ++j) { dummy_vtable[num_virtuals * i + j] = (void*)masm->pc(); __ save(SP, -256, SP); int offset = (i << 8) + j; Register src = G0; if (!Assembler::is_simm13(offset)) { __ sethi(offset, L0); src = L0; offset = offset & ((1 << 10) - 1); } __ brx(Assembler::always, false, Assembler::pt, common_code); // Load L0 with a value indicating vtable/offset pair. // -- bits[ 7..0] (8 bits) which virtual method in table? // -- bits[13..8] (6 bits) which virtual method table? __ delayed()->or3(src, offset, L0); } } __ bind(common_code); // Expecting to be called with the "this" pointer in O0/I0 (where // "this" is a Klass object). In addition, L0 was set (above) to // identify the method and table. // Look up the correct vtable pointer. __ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list. __ srl(L0, 8, L3); // Isolate L3 = vtable identifier. __ sll(L3, LogBytesPerWord, L3); __ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer. __ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry. // Restore registers and jump to the correct method; __ and3(L0, 255, L4); // Isolate L3 = method offset;. __ sll(L4, LogBytesPerWord, L4); __ ld_ptr(L3, L4, L4); // Get address of correct virtual method __ jmpl(L4, 0, G0); // Jump to correct method. __ delayed()->restore(); // Restore registers. __ flush(); *mc_top = (char*)__ pc(); guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers."); }