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src/cpu/x86/vm/jniFastGetField_x86_64.cpp@437d03ea40b1 (annotated)

src/cpu/x86/vm/jniFastGetField_x86_64.cpp

Wed, 21 May 2008 16:31:35 -0700

author

kvn

date

Wed, 21 May 2008 16:31:35 -0700

changeset 600

437d03ea40b1

parent 435

a61af66fc99e

child 739

dc7f315e41f7

permissions

-rw-r--r--

6703888: Compressed Oops: use the 32-bits gap after klass in a object
Summary: Use the gap also for a narrow oop field and a boxing object value.
Reviewed-by: coleenp, never

duke@435	1	/*
duke@435	2	* Copyright 2004-2006 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/_jniFastGetField_x86_64.cpp.incl"
duke@435	27
duke@435	28	#define __ masm->
duke@435	29
duke@435	30	#define BUFFER_SIZE 30*wordSize
duke@435	31
duke@435	32	// Instead of issuing lfence for LoadLoad barrier, we create data dependency
duke@435	33	// between loads, which is more efficient than lfence.
duke@435	34
duke@435	35	// Common register usage:
duke@435	36	// rax/xmm0: result
duke@435	37	// c_rarg0: jni env
duke@435	38	// c_rarg1: obj
duke@435	39	// c_rarg2: jfield id
duke@435	40
duke@435	41	static const Register robj = r9;
duke@435	42	static const Register rcounter = r10;
duke@435	43	static const Register roffset = r11;
duke@435	44	static const Register rcounter_addr = r11;
duke@435	45
duke@435	46	// Warning: do not use rip relative addressing after the first counter load
duke@435	47	// since that may scratch r10!
duke@435	48
duke@435	49	address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
duke@435	50	const char *name;
duke@435	51	switch (type) {
duke@435	52	case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
duke@435	53	case T_BYTE: name = "jni_fast_GetByteField"; break;
duke@435	54	case T_CHAR: name = "jni_fast_GetCharField"; break;
duke@435	55	case T_SHORT: name = "jni_fast_GetShortField"; break;
duke@435	56	case T_INT: name = "jni_fast_GetIntField"; break;
duke@435	57	case T_LONG: name = "jni_fast_GetLongField"; break;
duke@435	58	default: ShouldNotReachHere();
duke@435	59	}
duke@435	60	ResourceMark rm;
duke@435	61	BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE);
duke@435	62	address fast_entry = b->instructions_begin();
duke@435	63	CodeBuffer cbuf(fast_entry, b->instructions_size());
duke@435	64	MacroAssembler* masm = new MacroAssembler(&cbuf);
duke@435	65
duke@435	66	Label slow;
duke@435	67
duke@435	68	ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
duke@435	69	__ mov32 (rcounter, counter);
duke@435	70	__ movq (robj, c_rarg1);
duke@435	71	__ testb (rcounter, 1);
duke@435	72	__ jcc (Assembler::notZero, slow);
duke@435	73	if (os::is_MP()) {
duke@435	74	__ xorq (robj, rcounter);
duke@435	75	__ xorq (robj, rcounter); // obj, since
duke@435	76	// robj ^ rcounter ^ rcounter == robj
duke@435	77	// robj is data dependent on rcounter.
duke@435	78	}
duke@435	79	__ movq (robj, Address(robj, 0)); // *obj
duke@435	80	__ movq (roffset, c_rarg2);
duke@435	81	__ shrq (roffset, 2); // offset
duke@435	82
duke@435	83	assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
duke@435	84	speculative_load_pclist[count] = __ pc();
duke@435	85	switch (type) {
duke@435	86	case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	87	case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	88	case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	89	case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	90	case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	91	case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
duke@435	92	default: ShouldNotReachHere();
duke@435	93	}
duke@435	94
duke@435	95	if (os::is_MP()) {
duke@435	96	__ lea(rcounter_addr, counter);
duke@435	97	// ca is data dependent on rax.
duke@435	98	__ xorq (rcounter_addr, rax);
duke@435	99	__ xorq (rcounter_addr, rax);
duke@435	100	__ cmpl (rcounter, Address(rcounter_addr, 0));
duke@435	101	} else {
duke@435	102	__ cmp32 (rcounter, counter);
duke@435	103	}
duke@435	104	__ jcc (Assembler::notEqual, slow);
duke@435	105
duke@435	106	__ ret (0);
duke@435	107
duke@435	108	slowcase_entry_pclist[count++] = __ pc();
duke@435	109	__ bind (slow);
duke@435	110	address slow_case_addr;
duke@435	111	switch (type) {
duke@435	112	case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
duke@435	113	case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
duke@435	114	case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
duke@435	115	case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
duke@435	116	case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
duke@435	117	case T_LONG: slow_case_addr = jni_GetLongField_addr();
duke@435	118	}
duke@435	119	// tail call
duke@435	120	__ jump (ExternalAddress(slow_case_addr));
duke@435	121
duke@435	122	__ flush ();
duke@435	123
duke@435	124	return fast_entry;
duke@435	125	}
duke@435	126
duke@435	127	address JNI_FastGetField::generate_fast_get_boolean_field() {
duke@435	128	return generate_fast_get_int_field0(T_BOOLEAN);
duke@435	129	}
duke@435	130
duke@435	131	address JNI_FastGetField::generate_fast_get_byte_field() {
duke@435	132	return generate_fast_get_int_field0(T_BYTE);
duke@435	133	}
duke@435	134
duke@435	135	address JNI_FastGetField::generate_fast_get_char_field() {
duke@435	136	return generate_fast_get_int_field0(T_CHAR);
duke@435	137	}
duke@435	138
duke@435	139	address JNI_FastGetField::generate_fast_get_short_field() {
duke@435	140	return generate_fast_get_int_field0(T_SHORT);
duke@435	141	}
duke@435	142
duke@435	143	address JNI_FastGetField::generate_fast_get_int_field() {
duke@435	144	return generate_fast_get_int_field0(T_INT);
duke@435	145	}
duke@435	146
duke@435	147	address JNI_FastGetField::generate_fast_get_long_field() {
duke@435	148	return generate_fast_get_int_field0(T_LONG);
duke@435	149	}
duke@435	150
duke@435	151	address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
duke@435	152	const char *name;
duke@435	153	switch (type) {
duke@435	154	case T_FLOAT: name = "jni_fast_GetFloatField"; break;
duke@435	155	case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
duke@435	156	default: ShouldNotReachHere();
duke@435	157	}
duke@435	158	ResourceMark rm;
duke@435	159	BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE);
duke@435	160	address fast_entry = b->instructions_begin();
duke@435	161	CodeBuffer cbuf(fast_entry, b->instructions_size());
duke@435	162	MacroAssembler* masm = new MacroAssembler(&cbuf);
duke@435	163
duke@435	164	Label slow;
duke@435	165
duke@435	166	ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
duke@435	167	__ mov32 (rcounter, counter);
duke@435	168	__ movq (robj, c_rarg1);
duke@435	169	__ testb (rcounter, 1);
duke@435	170	__ jcc (Assembler::notZero, slow);
duke@435	171	if (os::is_MP()) {
duke@435	172	__ xorq (robj, rcounter);
duke@435	173	__ xorq (robj, rcounter); // obj, since
duke@435	174	// robj ^ rcounter ^ rcounter == robj
duke@435	175	// robj is data dependent on rcounter.
duke@435	176	}
duke@435	177	__ movq (robj, Address(robj, 0)); // *obj
duke@435	178	__ movq (roffset, c_rarg2);
duke@435	179	__ shrq (roffset, 2); // offset
duke@435	180
duke@435	181	assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
duke@435	182	speculative_load_pclist[count] = __ pc();
duke@435	183	switch (type) {
duke@435	184	case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
duke@435	185	case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
duke@435	186	default: ShouldNotReachHere();
duke@435	187	}
duke@435	188
duke@435	189	if (os::is_MP()) {
duke@435	190	__ lea(rcounter_addr, counter);
duke@435	191	__ movdq (rax, xmm0);
duke@435	192	// counter address is data dependent on xmm0.
duke@435	193	__ xorq (rcounter_addr, rax);
duke@435	194	__ xorq (rcounter_addr, rax);
duke@435	195	__ cmpl (rcounter, Address(rcounter_addr, 0));
duke@435	196	} else {
duke@435	197	__ cmp32 (rcounter, counter);
duke@435	198	}
duke@435	199	__ jcc (Assembler::notEqual, slow);
duke@435	200
duke@435	201	__ ret (0);
duke@435	202
duke@435	203	slowcase_entry_pclist[count++] = __ pc();
duke@435	204	__ bind (slow);
duke@435	205	address slow_case_addr;
duke@435	206	switch (type) {
duke@435	207	case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
duke@435	208	case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr();
duke@435	209	}
duke@435	210	// tail call
duke@435	211	__ jump (ExternalAddress(slow_case_addr));
duke@435	212
duke@435	213	__ flush ();
duke@435	214
duke@435	215	return fast_entry;
duke@435	216	}
duke@435	217
duke@435	218	address JNI_FastGetField::generate_fast_get_float_field() {
duke@435	219	return generate_fast_get_float_field0(T_FLOAT);
duke@435	220	}
duke@435	221
duke@435	222	address JNI_FastGetField::generate_fast_get_double_field() {
duke@435	223	return generate_fast_get_float_field0(T_DOUBLE);
duke@435	224	}