Mercurial > hg > truffle
diff src/cpu/sparc/vm/dump_sparc.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 6b2273dd6fa9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/cpu/sparc/vm/dump_sparc.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,117 @@ +/* + * 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_sparc.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; + + 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); + __ 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[12..8] (5 bits) which virtual method table? + // -- must fit in 13-bit instruction immediate field. + __ delayed()->set((i << 8) + j, 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 + Address method(L4, 0); + __ jmpl(method, G0); // Jump to correct method. + __ delayed()->restore(); // Restore registers. + + __ flush(); + *mc_top = (char*)__ pc(); + + guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers."); +}