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src/cpu/sparc/vm/metaspaceShared_sparc.cpp@75f33eecc1b3 (annotated)

src/cpu/sparc/vm/metaspaceShared_sparc.cpp

Tue, 11 Sep 2012 20:20:38 -0400

author

coleenp

date

Tue, 11 Sep 2012 20:20:38 -0400

changeset 4052

75f33eecc1b3

parent 4037

da91efe96a93

child 4323

f0c2369fda5a

permissions

-rw-r--r--

7196681: NPG: Some JSR 292 tests crash in Windows exception handler
Summary: There was a rogue os::breakpoint() call in log_dependency left over from the jsr292 merge. Also changed verify_oop() calls for metadata to verify_{method,klass}_ptr.
Reviewed-by: kvn, twisti

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_sparc.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	guarantee(*md_top <= md_end, "Insufficient space for vtables.");
duke@435	68
duke@435	69	// Get ready to generate dummy methods.
duke@435	70
duke@435	71	CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@435	72	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	73
duke@435	74	Label common_code;
duke@435	75	for (int i = 0; i < vtbl_list_size; ++i) {
duke@435	76	for (int j = 0; j < num_virtuals; ++j) {
duke@435	77	dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@435	78	__ save(SP, -256, SP);
never@2658	79	int offset = (i << 8) + j;
never@2658	80	Register src = G0;
never@2658	81	if (!Assembler::is_simm13(offset)) {
never@2658	82	__ sethi(offset, L0);
never@2658	83	src = L0;
never@2658	84	offset = offset & ((1 << 10) - 1);
never@2658	85	}
duke@435	86	__ brx(Assembler::always, false, Assembler::pt, common_code);
duke@435	87
duke@435	88	// Load L0 with a value indicating vtable/offset pair.
duke@435	89	// -- bits[ 7..0] (8 bits) which virtual method in table?
never@2658	90	// -- bits[13..8] (6 bits) which virtual method table?
never@2658	91	__ delayed()->or3(src, offset, L0);
duke@435	92	}
duke@435	93	}
duke@435	94
duke@435	95	__ bind(common_code);
duke@435	96
duke@435	97	// Expecting to be called with the "this" pointer in O0/I0 (where
duke@435	98	// "this" is a Klass object). In addition, L0 was set (above) to
duke@435	99	// identify the method and table.
duke@435	100
duke@435	101	// Look up the correct vtable pointer.
duke@435	102
duke@435	103	__ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
duke@435	104	__ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
duke@435	105	__ sll(L3, LogBytesPerWord, L3);
duke@435	106	__ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
duke@435	107	__ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
duke@435	108
duke@435	109	// Restore registers and jump to the correct method;
duke@435	110
duke@435	111	__ and3(L0, 255, L4); // Isolate L3 = method offset;.
duke@435	112	__ sll(L4, LogBytesPerWord, L4);
duke@435	113	__ ld_ptr(L3, L4, L4); // Get address of correct virtual method
twisti@1162	114	__ jmpl(L4, 0, G0); // Jump to correct method.
duke@435	115	__ delayed()->restore(); // Restore registers.
duke@435	116
duke@435	117	__ flush();
duke@435	118	*mc_top = (char*)__ pc();
duke@435	119
duke@435	120	guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
duke@435	121	}