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8006fe8f75
Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
120 lines
4.5 KiB
C++
120 lines
4.5 KiB
C++
/*
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* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "assembler_sparc.inline.hpp"
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#include "memory/compactingPermGenGen.hpp"
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#include "memory/generation.inline.hpp"
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#include "memory/space.inline.hpp"
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// Generate the self-patching vtable method:
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//
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// This method will be called (as any other Klass virtual method) with
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// the Klass itself as the first argument. Example:
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//
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// oop obj;
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// int size = obj->klass()->klass_part()->oop_size(this);
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//
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// for which the virtual method call is Klass::oop_size();
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//
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// The dummy method is called with the Klass object as the first
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// operand, and an object as the second argument.
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//
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//=====================================================================
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// All of the dummy methods in the vtable are essentially identical,
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// differing only by an ordinal constant, and they bear no releationship
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// to the original method which the caller intended. Also, there needs
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// to be 'vtbl_list_size' instances of the vtable in order to
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// differentiate between the 'vtable_list_size' original Klass objects.
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#define __ masm->
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void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
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void** vtable,
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char** md_top,
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char* md_end,
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char** mc_top,
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char* mc_end) {
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intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
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*(intptr_t *)(*md_top) = vtable_bytes;
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*md_top += sizeof(intptr_t);
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void** dummy_vtable = (void**)*md_top;
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*vtable = dummy_vtable;
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*md_top += vtable_bytes;
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guarantee(*md_top <= md_end, "Insufficient space for vtables.");
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// Get ready to generate dummy methods.
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CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
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MacroAssembler* masm = new MacroAssembler(&cb);
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Label common_code;
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for (int i = 0; i < vtbl_list_size; ++i) {
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for (int j = 0; j < num_virtuals; ++j) {
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dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
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__ save(SP, -256, SP);
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__ brx(Assembler::always, false, Assembler::pt, common_code);
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// Load L0 with a value indicating vtable/offset pair.
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// -- bits[ 7..0] (8 bits) which virtual method in table?
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// -- bits[12..8] (5 bits) which virtual method table?
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// -- must fit in 13-bit instruction immediate field.
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__ delayed()->set((i << 8) + j, L0);
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}
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}
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__ bind(common_code);
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// Expecting to be called with the "this" pointer in O0/I0 (where
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// "this" is a Klass object). In addition, L0 was set (above) to
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// identify the method and table.
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// Look up the correct vtable pointer.
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__ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
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__ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
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__ sll(L3, LogBytesPerWord, L3);
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__ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
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__ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
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// Restore registers and jump to the correct method;
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__ and3(L0, 255, L4); // Isolate L3 = method offset;.
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__ sll(L4, LogBytesPerWord, L4);
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__ ld_ptr(L3, L4, L4); // Get address of correct virtual method
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__ jmpl(L4, 0, G0); // Jump to correct method.
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__ delayed()->restore(); // Restore registers.
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__ flush();
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*mc_top = (char*)__ pc();
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guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
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}
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