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src/cpu/x86/vm/dump_x86_32.cpp@45a1bf98f1bb (annotated)

src/cpu/x86/vm/dump_x86_32.cpp

Mon, 13 Feb 2012 02:29:22 -0800

author

twisti

date

Mon, 13 Feb 2012 02:29:22 -0800

changeset 3566

45a1bf98f1bb

parent 2314

f95d63e2154a

permissions

-rw-r--r--

7141329: Strange values of stack_size in -XX:+TraceMethodHandles output
Reviewed-by: kvn, never

duke@435	1	/*
stefank@2314	2	* Copyright (c) 2004, 2010, 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"
stefank@2314	27	#include "memory/compactingPermGenGen.hpp"
stefank@2314	28	#include "memory/generation.inline.hpp"
stefank@2314	29	#include "memory/space.inline.hpp"
duke@435	30
duke@435	31
duke@435	32
duke@435	33	// Generate the self-patching vtable method:
duke@435	34	//
duke@435	35	// This method will be called (as any other Klass virtual method) with
duke@435	36	// the Klass itself as the first argument. Example:
duke@435	37	//
duke@435	38	// oop obj;
duke@435	39	// int size = obj->klass()->klass_part()->oop_size(this);
duke@435	40	//
duke@435	41	// for which the virtual method call is Klass::oop_size();
duke@435	42	//
duke@435	43	// The dummy method is called with the Klass object as the first
duke@435	44	// operand, and an object as the second argument.
duke@435	45	//
duke@435	46
duke@435	47	//=====================================================================
duke@435	48
duke@435	49	// All of the dummy methods in the vtable are essentially identical,
duke@435	50	// differing only by an ordinal constant, and they bear no releationship
duke@435	51	// to the original method which the caller intended. Also, there needs
duke@435	52	// to be 'vtbl_list_size' instances of the vtable in order to
duke@435	53	// differentiate between the 'vtable_list_size' original Klass objects.
duke@435	54
duke@435	55	#define __ masm->
duke@435	56
duke@435	57	void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
duke@435	58	void** vtable,
duke@435	59	char** md_top,
duke@435	60	char* md_end,
duke@435	61	char** mc_top,
duke@435	62	char* mc_end) {
duke@435	63
duke@435	64	intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
duke@435	65	*(intptr_t *)(*md_top) = vtable_bytes;
duke@435	66	*md_top += sizeof(intptr_t);
duke@435	67	void** dummy_vtable = (void**)*md_top;
duke@435	68	*vtable = dummy_vtable;
duke@435	69	*md_top += vtable_bytes;
duke@435	70
duke@435	71	// Get ready to generate dummy methods.
duke@435	72
duke@435	73	CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@435	74	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	75
duke@435	76	Label common_code;
duke@435	77	for (int i = 0; i < vtbl_list_size; ++i) {
duke@435	78	for (int j = 0; j < num_virtuals; ++j) {
duke@435	79	dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@435	80
duke@435	81	// Load rax, with a value indicating vtable/offset pair.
duke@435	82	// -- bits[ 7..0] (8 bits) which virtual method in table?
duke@435	83	// -- bits[12..8] (5 bits) which virtual method table?
duke@435	84	// -- must fit in 13-bit instruction immediate field.
duke@435	85	__ movl(rax, (i << 8) + j);
duke@435	86	__ jmp(common_code);
duke@435	87	}
duke@435	88	}
duke@435	89
duke@435	90	__ bind(common_code);
duke@435	91
duke@435	92	#ifdef WIN32
duke@435	93	// Expecting to be called with "thiscall" conventions -- the arguments
duke@435	94	// are on the stack, except that the "this" pointer is in rcx.
duke@435	95	#else
duke@435	96	// Expecting to be called with Unix conventions -- the arguments
duke@435	97	// are on the stack, including the "this" pointer.
duke@435	98	#endif
duke@435	99
duke@435	100	// In addition, rax was set (above) to the offset of the method in the
duke@435	101	// table.
duke@435	102
duke@435	103	#ifdef WIN32
never@739	104	__ push(rcx); // save "this"
duke@435	105	#endif
never@739	106	__ mov(rcx, rax);
never@739	107	__ shrptr(rcx, 8); // isolate vtable identifier.
never@739	108	__ shlptr(rcx, LogBytesPerWord);
duke@435	109	Address index(noreg, rcx, Address::times_1);
duke@435	110	ExternalAddress vtbl((address)vtbl_list);
duke@435	111	__ movptr(rdx, ArrayAddress(vtbl, index)); // get correct vtable address.
duke@435	112	#ifdef WIN32
never@739	113	__ pop(rcx); // restore "this"
duke@435	114	#else
never@739	115	__ movptr(rcx, Address(rsp, BytesPerWord)); // fetch "this"
duke@435	116	#endif
never@739	117	__ movptr(Address(rcx, 0), rdx); // update vtable pointer.
duke@435	118
never@739	119	__ andptr(rax, 0x00ff); // isolate vtable method index
never@739	120	__ shlptr(rax, LogBytesPerWord);
never@739	121	__ addptr(rax, rdx); // address of real method pointer.
duke@435	122	__ jmp(Address(rax, 0)); // get real method pointer.
duke@435	123
duke@435	124	__ flush();
duke@435	125
duke@435	126	*mc_top = (char*)__ pc();
duke@435	127	}