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src/cpu/sparc/vm/dump_sparc.cpp@2338d41fbd81 (annotated)

src/cpu/sparc/vm/dump_sparc.cpp

Fri, 30 Apr 2010 08:37:24 -0700

author

twisti

date

Fri, 30 Apr 2010 08:37:24 -0700

changeset 1861

2338d41fbd81

parent 1162

6b2273dd6fa9

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6943304: remove tagged stack interpreter
Reviewed-by: coleenp, never, gbenson

duke@435	1	/*
twisti@1162	2	* Copyright 2004-2009 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_sparc.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	guarantee(*md_top <= md_end, "Insufficient space for vtables.");
duke@435	69
duke@435	70	// Get ready to generate dummy methods.
duke@435	71
duke@435	72	CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@435	73	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	74
duke@435	75	Label common_code;
duke@435	76	for (int i = 0; i < vtbl_list_size; ++i) {
duke@435	77	for (int j = 0; j < num_virtuals; ++j) {
duke@435	78	dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@435	79	__ save(SP, -256, SP);
duke@435	80	__ brx(Assembler::always, false, Assembler::pt, common_code);
duke@435	81
duke@435	82	// Load L0 with a value indicating vtable/offset pair.
duke@435	83	// -- bits[ 7..0] (8 bits) which virtual method in table?
duke@435	84	// -- bits[12..8] (5 bits) which virtual method table?
duke@435	85	// -- must fit in 13-bit instruction immediate field.
duke@435	86	__ delayed()->set((i << 8) + j, L0);
duke@435	87	}
duke@435	88	}
duke@435	89
duke@435	90	__ bind(common_code);
duke@435	91
duke@435	92	// Expecting to be called with the "this" pointer in O0/I0 (where
duke@435	93	// "this" is a Klass object). In addition, L0 was set (above) to
duke@435	94	// identify the method and table.
duke@435	95
duke@435	96	// Look up the correct vtable pointer.
duke@435	97
duke@435	98	__ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
duke@435	99	__ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
duke@435	100	__ sll(L3, LogBytesPerWord, L3);
duke@435	101	__ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
duke@435	102	__ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
duke@435	103
duke@435	104	// Restore registers and jump to the correct method;
duke@435	105
duke@435	106	__ and3(L0, 255, L4); // Isolate L3 = method offset;.
duke@435	107	__ sll(L4, LogBytesPerWord, L4);
duke@435	108	__ ld_ptr(L3, L4, L4); // Get address of correct virtual method
twisti@1162	109	__ jmpl(L4, 0, G0); // Jump to correct method.
duke@435	110	__ delayed()->restore(); // Restore registers.
duke@435	111
duke@435	112	__ flush();
duke@435	113	*mc_top = (char*)__ pc();
duke@435	114
duke@435	115	guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
duke@435	116	}