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src/cpu/x86/vm/metaspaceShared_x86_32.cpp@d8ce2825b193 (annotated)

src/cpu/x86/vm/metaspaceShared_x86_32.cpp

Sat, 29 Sep 2012 06:40:00 -0400

author

coleenp

date

Sat, 29 Sep 2012 06:40:00 -0400

changeset 4142

d8ce2825b193

parent 4037

da91efe96a93

child 4318

cd3d6a6b95d9

permissions

-rw-r--r--

8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
Summary: Capitalize these metadata types (and objArrayKlass)
Reviewed-by: stefank, twisti, kvn

duke@435	1	/*
coleenp@4037	2	* Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "assembler_x86.inline.hpp"
coleenp@4037	27	#include "memory/metaspaceShared.hpp"
duke@435	28
duke@435	29	// Generate the self-patching vtable method:
duke@435	30	//
duke@435	31	// This method will be called (as any other Klass virtual method) with
duke@435	32	// the Klass itself as the first argument. Example:
duke@435	33	//
duke@435	34	// oop obj;
coleenp@4037	35	// int size = obj->klass()->oop_size(this);
duke@435	36	//
duke@435	37	// for which the virtual method call is Klass::oop_size();
duke@435	38	//
duke@435	39	// The dummy method is called with the Klass object as the first
duke@435	40	// operand, and an object as the second argument.
duke@435	41	//
duke@435	42
duke@435	43	//=====================================================================
duke@435	44
duke@435	45	// All of the dummy methods in the vtable are essentially identical,
coleenp@4037	46	// differing only by an ordinal constant, and they bear no relationship
duke@435	47	// to the original method which the caller intended. Also, there needs
duke@435	48	// to be 'vtbl_list_size' instances of the vtable in order to
duke@435	49	// differentiate between the 'vtable_list_size' original Klass objects.
duke@435	50
duke@435	51	#define __ masm->
duke@435	52
coleenp@4037	53	void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
duke@435	54	void** vtable,
duke@435	55	char** md_top,
duke@435	56	char* md_end,
duke@435	57	char** mc_top,
duke@435	58	char* mc_end) {
duke@435	59
duke@435	60	intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
duke@435	61	*(intptr_t *)(*md_top) = vtable_bytes;
duke@435	62	*md_top += sizeof(intptr_t);
duke@435	63	void** dummy_vtable = (void**)*md_top;
duke@435	64	*vtable = dummy_vtable;
duke@435	65	*md_top += vtable_bytes;
duke@435	66
duke@435	67	// Get ready to generate dummy methods.
duke@435	68
duke@435	69	CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@435	70	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	71
duke@435	72	Label common_code;
duke@435	73	for (int i = 0; i < vtbl_list_size; ++i) {
duke@435	74	for (int j = 0; j < num_virtuals; ++j) {
duke@435	75	dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@435	76
duke@435	77	// Load rax, with a value indicating vtable/offset pair.
duke@435	78	// -- bits[ 7..0] (8 bits) which virtual method in table?
duke@435	79	// -- bits[12..8] (5 bits) which virtual method table?
duke@435	80	// -- must fit in 13-bit instruction immediate field.
duke@435	81	__ movl(rax, (i << 8) + j);
duke@435	82	__ jmp(common_code);
duke@435	83	}
duke@435	84	}
duke@435	85
duke@435	86	__ bind(common_code);
duke@435	87
duke@435	88	#ifdef WIN32
duke@435	89	// Expecting to be called with "thiscall" conventions -- the arguments
duke@435	90	// are on the stack, except that the "this" pointer is in rcx.
duke@435	91	#else
duke@435	92	// Expecting to be called with Unix conventions -- the arguments
duke@435	93	// are on the stack, including the "this" pointer.
duke@435	94	#endif
duke@435	95
duke@435	96	// In addition, rax was set (above) to the offset of the method in the
duke@435	97	// table.
duke@435	98
duke@435	99	#ifdef WIN32
never@739	100	__ push(rcx); // save "this"
duke@435	101	#endif
never@739	102	__ mov(rcx, rax);
never@739	103	__ shrptr(rcx, 8); // isolate vtable identifier.
never@739	104	__ shlptr(rcx, LogBytesPerWord);
duke@435	105	Address index(noreg, rcx, Address::times_1);
duke@435	106	ExternalAddress vtbl((address)vtbl_list);
duke@435	107	__ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
duke@435	108	#ifdef WIN32
never@739	109	__ pop(rcx); // restore "this"
duke@435	110	#else
never@739	111	__ movptr(rcx, Address(rsp, BytesPerWord)); // fetch "this"
duke@435	112	#endif
never@739	113	__ movptr(Address(rcx, 0), rdx); // update vtable pointer.
duke@435	114
never@739	115	__ andptr(rax, 0x00ff); // isolate vtable method index
never@739	116	__ shlptr(rax, LogBytesPerWord);
never@739	117	__ addptr(rax, rdx); // address of real method pointer.
duke@435	118	__ jmp(Address(rax, 0)); // get real method pointer.
duke@435	119
duke@435	120	__ flush();
duke@435	121
duke@435	122	*mc_top = (char*)__ pc();
duke@435	123	}