Mercurial > hg > truffle
view src/cpu/x86/vm/dump_x86_64.cpp @ 3993:e4f412d2b75d hs23-b02
Merge
author | jcoomes |
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date | Fri, 14 Oct 2011 18:17:01 -0700 |
parents | f95d63e2154a |
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/* * Copyright (c) 2004, 2010, 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/compactingPermGenGen.hpp" #include "memory/generation.inline.hpp" #include "memory/space.inline.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()->klass_part()->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 releationship // 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 CompactingPermGenGen::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(); }