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src/cpu/x86/vm/icBuffer_x86.cpp@885ed790ecf0 (annotated)

src/cpu/x86/vm/icBuffer_x86.cpp

Wed, 21 May 2008 10:45:07 -0700

author

kvn

date

Wed, 21 May 2008 10:45:07 -0700

changeset 598

885ed790ecf0

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6695810: null oop passed to encode_heap_oop_not_null
Summary: fix several problems in C2 related to Escape Analysis and Compressed Oops.
Reviewed-by: never, jrose

duke@435	1	/*
duke@435	2	* Copyright 1997-2006 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/_icBuffer_x86.cpp.incl"
duke@435	27
duke@435	28	int InlineCacheBuffer::ic_stub_code_size() {
duke@435	29	return NativeMovConstReg::instruction_size +
duke@435	30	NativeJump::instruction_size +
duke@435	31	1;
duke@435	32	// so that code_end can be set in CodeBuffer
duke@435	33	// 64bit 16 = 5 + 10 bytes + 1 byte
duke@435	34	// 32bit 11 = 10 bytes + 1 byte
duke@435	35	}
duke@435	36
duke@435	37
duke@435	38
duke@435	39	void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) {
duke@435	40	ResourceMark rm;
duke@435	41	CodeBuffer code(code_begin, ic_stub_code_size());
duke@435	42	MacroAssembler* masm = new MacroAssembler(&code);
duke@435	43	// note: even though the code contains an embedded oop, we do not need reloc info
duke@435	44	// because
duke@435	45	// (1) the oop is old (i.e., doesn't matter for scavenges)
duke@435	46	// (2) these ICStubs are removed *before* a GC happens, so the roots disappear
duke@435	47	assert(cached_oop == NULL || cached_oop->is_perm(), "must be perm oop");
duke@435	48	masm->lea(rax, OopAddress((address) cached_oop));
duke@435	49	masm->jump(ExternalAddress(entry_point));
duke@435	50	}
duke@435	51
duke@435	52
duke@435	53	address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
duke@435	54	NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object
duke@435	55	NativeJump* jump = nativeJump_at(move->next_instruction_address());
duke@435	56	return jump->jump_destination();
duke@435	57	}
duke@435	58
duke@435	59
duke@435	60	oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) {
duke@435	61	// creation also verifies the object
duke@435	62	NativeMovConstReg* move = nativeMovConstReg_at(code_begin);
duke@435	63	// Verifies the jump
duke@435	64	NativeJump* jump = nativeJump_at(move->next_instruction_address());
duke@435	65	return (oop)move->data();
duke@435	66	}