Mercurial > hg > graal-compiler
view src/cpu/x86/vm/dump_x86_32.cpp @ 87:ad0b851458ff jdk7-b26
Merge
author | trims |
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date | Tue, 22 Apr 2008 15:36:18 -0700 |
parents | a61af66fc99e |
children | dc7f315e41f7 |
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/* * Copyright 2004-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_dump_x86_32.cpp.incl" // 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 rax, 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); #ifdef WIN32 // Expecting to be called with "thiscall" conventions -- the arguments // are on the stack, except that the "this" pointer is in rcx. #else // Expecting to be called with Unix conventions -- the arguments // are on the stack, including the "this" pointer. #endif // In addition, rax was set (above) to the offset of the method in the // table. #ifdef WIN32 __ pushl(rcx); // save "this" #endif __ movl(rcx, rax); __ shrl(rcx, 8); // isolate vtable identifier. __ shll(rcx, LogBytesPerWord); Address index(noreg, rcx, Address::times_1); ExternalAddress vtbl((address)vtbl_list); __ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address. #ifdef WIN32 __ popl(rcx); // restore "this" #else __ movl(rcx, Address(rsp, 4)); // fetch "this" #endif __ movl(Address(rcx, 0), rdx); // update vtable pointer. __ andl(rax, 0x00ff); // isolate vtable method index __ shll(rax, LogBytesPerWord); __ addl(rax, rdx); // address of real method pointer. __ jmp(Address(rax, 0)); // get real method pointer. __ flush(); *mc_top = (char*)__ pc(); }