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src/cpu/x86/vm/icBuffer_x86.cpp@70aa912cebe5 (annotated)

src/cpu/x86/vm/icBuffer_x86.cpp

Wed, 15 Apr 2020 11:49:55 +0800

author

aoqi

date

Wed, 15 Apr 2020 11:49:55 +0800

changeset 9852

70aa912cebe5

parent 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "asm/macroAssembler.hpp"
aoqi@0	27	#include "asm/macroAssembler.inline.hpp"
aoqi@0	28	#include "code/icBuffer.hpp"
aoqi@0	29	#include "gc_interface/collectedHeap.inline.hpp"
aoqi@0	30	#include "interpreter/bytecodes.hpp"
aoqi@0	31	#include "memory/resourceArea.hpp"
aoqi@0	32	#include "nativeInst_x86.hpp"
aoqi@0	33	#include "oops/oop.inline.hpp"
aoqi@0	34	#include "oops/oop.inline2.hpp"
aoqi@0	35
aoqi@0	36	int InlineCacheBuffer::ic_stub_code_size() {
aoqi@0	37	return NativeMovConstReg::instruction_size +
aoqi@0	38	NativeJump::instruction_size +
aoqi@0	39	1;
aoqi@0	40	// so that code_end can be set in CodeBuffer
aoqi@0	41	// 64bit 16 = 5 + 10 bytes + 1 byte
aoqi@0	42	// 32bit 11 = 10 bytes + 1 byte
aoqi@0	43	}
aoqi@0	44
aoqi@0	45
aoqi@0	46
aoqi@0	47	void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
aoqi@0	48	ResourceMark rm;
aoqi@0	49	CodeBuffer code(code_begin, ic_stub_code_size());
aoqi@0	50	MacroAssembler* masm = new MacroAssembler(&code);
aoqi@0	51	// note: even though the code contains an embedded value, we do not need reloc info
aoqi@0	52	// because
aoqi@0	53	// (1) the value is old (i.e., doesn't matter for scavenges)
aoqi@0	54	// (2) these ICStubs are removed *before* a GC happens, so the roots disappear
aoqi@0	55	// assert(cached_value == NULL || cached_oop->is_perm(), "must be perm oop");
aoqi@0	56	masm->lea(rax, AddressLiteral((address) cached_value, relocInfo::metadata_type));
aoqi@0	57	masm->jump(ExternalAddress(entry_point));
aoqi@0	58	}
aoqi@0	59
aoqi@0	60
aoqi@0	61	address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
aoqi@0	62	NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
aoqi@0	63	NativeJump* jump = nativeJump_at(move->next_instruction_address());
aoqi@0	64	return jump->jump_destination();
aoqi@0	65	}
aoqi@0	66
aoqi@0	67
aoqi@0	68	void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
aoqi@0	69	// creation also verifies the object
aoqi@0	70	NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
aoqi@0	71	// Verifies the jump
aoqi@0	72	NativeJump* jump = nativeJump_at(move->next_instruction_address());
aoqi@0	73	void* o = (void*)move->data();
aoqi@0	74	return o;
aoqi@0	75	}