Mercurial > hg > graal-compiler
diff src/cpu/x86/vm/metaspaceShared_x86_64.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
---|---|
date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | src/cpu/x86/vm/dump_x86_64.cpp@f95d63e2154a |
children | cd3d6a6b95d9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/x86/vm/metaspaceShared_x86_64.cpp Sat Sep 01 13:25:18 2012 -0400 @@ -0,0 +1,113 @@ +/* + * 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 "assembler_x86.inline.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; + + // 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(); + + // Load eax with a value indicating vtable/offset pair. + // -- bits[ 7..0] (8 bits) which virtual method in table? + // -- bits[12..8] (5 bits) which virtual method table? + // -- must fit in 13-bit instruction immediate field. + __ movl(rax, (i << 8) + j); + __ jmp(common_code); + } + } + + __ bind(common_code); + + // Expecting to be called with "thiscall" convections -- the arguments + // are on the stack and the "this" pointer is in c_rarg0. In addition, rax + // was set (above) to the offset of the method in the table. + + __ push(c_rarg1); // save & free register + __ push(c_rarg0); // save "this" + __ mov(c_rarg0, rax); + __ shrptr(c_rarg0, 8); // isolate vtable identifier. + __ shlptr(c_rarg0, LogBytesPerWord); + __ lea(c_rarg1, ExternalAddress((address)vtbl_list)); // ptr to correct vtable list. + __ addptr(c_rarg1, c_rarg0); // ptr to list entry. + __ movptr(c_rarg1, Address(c_rarg1, 0)); // get correct vtable address. + __ pop(c_rarg0); // restore "this" + __ movptr(Address(c_rarg0, 0), c_rarg1); // update vtable pointer. + + __ andptr(rax, 0x00ff); // isolate vtable method index + __ shlptr(rax, LogBytesPerWord); + __ addptr(rax, c_rarg1); // address of real method pointer. + __ pop(c_rarg1); // restore register. + __ movptr(rax, Address(rax, 0)); // get real method pointer. + __ jmp(rax); // jump to the real method. + + __ flush(); + + *mc_top = (char*)__ pc(); +}