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src/cpu/x86/vm/dump_x86_32.cpp@c771b7f43bbf (annotated)

src/cpu/x86/vm/dump_x86_32.cpp

Fri, 13 Mar 2009 11:35:17 -0700

author

twisti

date

Fri, 13 Mar 2009 11:35:17 -0700

changeset 1078

c771b7f43bbf

parent 772

9ee9cf798b59

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6378821: bitCount() should use POPC on SPARC processors and AMD+10h
Summary: bitCount() should use POPC on SPARC processors where POPC is implemented directly in hardware.
Reviewed-by: kvn, never

duke@435	1	/*
xdono@772	2	* Copyright 2004-2008 Sun Microsystems, Inc. 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	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_dump_x86_32.cpp.incl"
duke@435	27
duke@435	28
duke@435	29
duke@435	30	// Generate the self-patching vtable method:
duke@435	31	//
duke@435	32	// This method will be called (as any other Klass virtual method) with
duke@435	33	// the Klass itself as the first argument. Example:
duke@435	34	//
duke@435	35	// oop obj;
duke@435	36	// int size = obj->klass()->klass_part()->oop_size(this);
duke@435	37	//
duke@435	38	// for which the virtual method call is Klass::oop_size();
duke@435	39	//
duke@435	40	// The dummy method is called with the Klass object as the first
duke@435	41	// operand, and an object as the second argument.
duke@435	42	//
duke@435	43
duke@435	44	//=====================================================================
duke@435	45
duke@435	46	// All of the dummy methods in the vtable are essentially identical,
duke@435	47	// differing only by an ordinal constant, and they bear no releationship
duke@435	48	// to the original method which the caller intended. Also, there needs
duke@435	49	// to be 'vtbl_list_size' instances of the vtable in order to
duke@435	50	// differentiate between the 'vtable_list_size' original Klass objects.
duke@435	51
duke@435	52	#define __ masm->
duke@435	53
duke@435	54	void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
duke@435	55	void** vtable,
duke@435	56	char** md_top,
duke@435	57	char* md_end,
duke@435	58	char** mc_top,
duke@435	59	char* mc_end) {
duke@435	60
duke@435	61	intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
duke@435	62	*(intptr_t *)(*md_top) = vtable_bytes;
duke@435	63	*md_top += sizeof(intptr_t);
duke@435	64	void** dummy_vtable = (void**)*md_top;
duke@435	65	*vtable = dummy_vtable;
duke@435	66	*md_top += vtable_bytes;
duke@435	67
duke@435	68	// Get ready to generate dummy methods.
duke@435	69
duke@435	70	CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@435	71	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	72
duke@435	73	Label common_code;
duke@435	74	for (int i = 0; i < vtbl_list_size; ++i) {
duke@435	75	for (int j = 0; j < num_virtuals; ++j) {
duke@435	76	dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@435	77
duke@435	78	// Load rax, with a value indicating vtable/offset pair.
duke@435	79	// -- bits[ 7..0] (8 bits) which virtual method in table?
duke@435	80	// -- bits[12..8] (5 bits) which virtual method table?
duke@435	81	// -- must fit in 13-bit instruction immediate field.
duke@435	82	__ movl(rax, (i << 8) + j);
duke@435	83	__ jmp(common_code);
duke@435	84	}
duke@435	85	}
duke@435	86
duke@435	87	__ bind(common_code);
duke@435	88
duke@435	89	#ifdef WIN32
duke@435	90	// Expecting to be called with "thiscall" conventions -- the arguments
duke@435	91	// are on the stack, except that the "this" pointer is in rcx.
duke@435	92	#else
duke@435	93	// Expecting to be called with Unix conventions -- the arguments
duke@435	94	// are on the stack, including the "this" pointer.
duke@435	95	#endif
duke@435	96
duke@435	97	// In addition, rax was set (above) to the offset of the method in the
duke@435	98	// table.
duke@435	99
duke@435	100	#ifdef WIN32
never@739	101	__ push(rcx); // save "this"
duke@435	102	#endif
never@739	103	__ mov(rcx, rax);
never@739	104	__ shrptr(rcx, 8); // isolate vtable identifier.
never@739	105	__ shlptr(rcx, LogBytesPerWord);
duke@435	106	Address index(noreg, rcx, Address::times_1);
duke@435	107	ExternalAddress vtbl((address)vtbl_list);
duke@435	108	__ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
duke@435	109	#ifdef WIN32
never@739	110	__ pop(rcx); // restore "this"
duke@435	111	#else
never@739	112	__ movptr(rcx, Address(rsp, BytesPerWord)); // fetch "this"
duke@435	113	#endif
never@739	114	__ movptr(Address(rcx, 0), rdx); // update vtable pointer.
duke@435	115
never@739	116	__ andptr(rax, 0x00ff); // isolate vtable method index
never@739	117	__ shlptr(rax, LogBytesPerWord);
never@739	118	__ addptr(rax, rdx); // address of real method pointer.
duke@435	119	__ jmp(Address(rax, 0)); // get real method pointer.
duke@435	120
duke@435	121	__ flush();
duke@435	122
duke@435	123	*mc_top = (char*)__ pc();
duke@435	124	}