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src/cpu/x86/vm/vtableStubs_x86_32.cpp@f3de1255b035 (annotated)

src/cpu/x86/vm/vtableStubs_x86_32.cpp

Wed, 07 May 2008 08:06:46 -0700

author

rasbold

date

Wed, 07 May 2008 08:06:46 -0700

changeset 580

f3de1255b035

parent 451

f8236e79048a

child 739

dc7f315e41f7

permissions

-rw-r--r--

6603011: RFE: Optimize long division
Summary: Transform long division by constant into multiply
Reviewed-by: never, kvn

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/_vtableStubs_x86_32.cpp.incl"
duke@435	27
duke@435	28	// machine-dependent part of VtableStubs: create VtableStub of correct size and
duke@435	29	// initialize its code
duke@435	30
duke@435	31	#define __ masm->
duke@435	32
duke@435	33	#ifndef PRODUCT
duke@435	34	extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
duke@435	35	#endif
duke@435	36
duke@435	37	// used by compiler only; may use only caller saved registers rax, rbx, rcx.
duke@435	38	// rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
duke@435	39	// Leave receiver in rcx; required behavior when +OptoArgsInRegisters
duke@435	40	// is modifed to put first oop in rcx.
duke@435	41	//
duke@435	42	VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
duke@435	43	const int i486_code_length = VtableStub::pd_code_size_limit(true);
duke@435	44	VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
duke@435	45	ResourceMark rm;
duke@435	46	CodeBuffer cb(s->entry_point(), i486_code_length);
duke@435	47	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	48
duke@435	49	#ifndef PRODUCT
duke@435	50
duke@435	51	if (CountCompiledCalls) {
duke@435	52	__ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435	53	}
duke@435	54	#endif /* PRODUCT */
duke@435	55
duke@435	56	// get receiver (need to skip return address on top of stack)
duke@435	57	assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
duke@435	58
duke@435	59	// get receiver klass
duke@435	60	address npe_addr = __ pc();
duke@435	61	__ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
duke@435	62	// compute entry offset (in words)
duke@435	63	int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
duke@435	64	#ifndef PRODUCT
duke@435	65	if (DebugVtables) {
duke@435	66	Label L;
duke@435	67	// check offset vs vtable length
duke@435	68	__ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
duke@435	69	__ jcc(Assembler::greater, L);
duke@435	70	__ movl(rbx, vtable_index);
duke@435	71	__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
duke@435	72	__ bind(L);
duke@435	73	}
duke@435	74	#endif // PRODUCT
duke@435	75
duke@435	76	const Register method = rbx;
duke@435	77
duke@435	78	// load methodOop and target address
duke@435	79	__ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
duke@435	80	if (DebugVtables) {
duke@435	81	Label L;
duke@435	82	__ cmpl(method, NULL_WORD);
duke@435	83	__ jcc(Assembler::equal, L);
duke@435	84	__ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
duke@435	85	__ jcc(Assembler::notZero, L);
duke@435	86	__ stop("Vtable entry is NULL");
duke@435	87	__ bind(L);
duke@435	88	}
duke@435	89
duke@435	90	// rax,: receiver klass
duke@435	91	// method (rbx): methodOop
duke@435	92	// rcx: receiver
duke@435	93	address ame_addr = __ pc();
duke@435	94	__ jmp( Address(method, methodOopDesc::from_compiled_offset()));
duke@435	95
duke@435	96	masm->flush();
duke@435	97	s->set_exception_points(npe_addr, ame_addr);
duke@435	98	return s;
duke@435	99	}
duke@435	100
duke@435	101
duke@435	102	VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
duke@435	103	// Note well: pd_code_size_limit is the absolute minimum we can get away with. If you
duke@435	104	// add code here, bump the code stub size returned by pd_code_size_limit!
duke@435	105	const int i486_code_length = VtableStub::pd_code_size_limit(false);
duke@435	106	VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
duke@435	107	ResourceMark rm;
duke@435	108	CodeBuffer cb(s->entry_point(), i486_code_length);
duke@435	109	MacroAssembler* masm = new MacroAssembler(&cb);
duke@435	110
duke@435	111	// Entry arguments:
duke@435	112	// rax,: Interface
duke@435	113	// rcx: Receiver
duke@435	114
duke@435	115	#ifndef PRODUCT
duke@435	116	if (CountCompiledCalls) {
duke@435	117	__ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435	118	}
duke@435	119	#endif /* PRODUCT */
duke@435	120	// get receiver (need to skip return address on top of stack)
duke@435	121
duke@435	122	assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
duke@435	123
duke@435	124	// get receiver klass (also an implicit null-check)
duke@435	125	address npe_addr = __ pc();
duke@435	126	__ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
duke@435	127
duke@435	128	__ movl(rsi, rbx); // Save klass in free register
duke@435	129	// Most registers are in use, so save a few
duke@435	130	__ pushl(rdx);
duke@435	131	// compute itable entry offset (in words)
duke@435	132	const int base = instanceKlass::vtable_start_offset() * wordSize;
duke@435	133	assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
duke@435	134	__ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
duke@435	135	__ leal(rbx, Address(rbx, rdx, Address::times_4, base));
duke@435	136	if (HeapWordsPerLong > 1) {
duke@435	137	// Round up to align_object_offset boundary
duke@435	138	__ round_to(rbx, BytesPerLong);
duke@435	139	}
duke@435	140
dcubed@451	141	Label hit, next, entry, throw_icce;
duke@435	142
dcubed@451	143	__ jmpb(entry);
duke@435	144
duke@435	145	__ bind(next);
duke@435	146	__ addl(rbx, itableOffsetEntry::size() * wordSize);
duke@435	147
duke@435	148	__ bind(entry);
duke@435	149
dcubed@451	150	// If the entry is NULL then we've reached the end of the table
dcubed@451	151	// without finding the expected interface, so throw an exception
dcubed@451	152	__ movl(rdx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
dcubed@451	153	__ testl(rdx, rdx);
dcubed@451	154	__ jcc(Assembler::zero, throw_icce);
dcubed@451	155	__ cmpl(rax, rdx);
duke@435	156	__ jcc(Assembler::notEqual, next);
duke@435	157
duke@435	158	// We found a hit, move offset into rbx,
duke@435	159	__ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
duke@435	160
duke@435	161	// Compute itableMethodEntry.
duke@435	162	const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
duke@435	163
duke@435	164	// Get methodOop and entrypoint for compiler
duke@435	165	const Register method = rbx;
duke@435	166	__ movl(method, Address(rsi, rdx, Address::times_1, method_offset));
duke@435	167
duke@435	168	// Restore saved register, before possible trap.
duke@435	169	__ popl(rdx);
duke@435	170
duke@435	171	// method (rbx): methodOop
duke@435	172	// rcx: receiver
duke@435	173
duke@435	174	#ifdef ASSERT
duke@435	175	if (DebugVtables) {
duke@435	176	Label L1;
duke@435	177	__ cmpl(method, NULL_WORD);
duke@435	178	__ jcc(Assembler::equal, L1);
duke@435	179	__ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
duke@435	180	__ jcc(Assembler::notZero, L1);
duke@435	181	__ stop("methodOop is null");
duke@435	182	__ bind(L1);
duke@435	183	}
duke@435	184	#endif // ASSERT
duke@435	185
duke@435	186	address ame_addr = __ pc();
duke@435	187	__ jmp(Address(method, methodOopDesc::from_compiled_offset()));
duke@435	188
dcubed@451	189	__ bind(throw_icce);
dcubed@451	190	// Restore saved register
dcubed@451	191	__ popl(rdx);
dcubed@451	192	__ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
dcubed@451	193
duke@435	194	masm->flush();
dcubed@451	195
dcubed@451	196	guarantee(__ pc() <= s->code_end(), "overflowed buffer");
dcubed@451	197
duke@435	198	s->set_exception_points(npe_addr, ame_addr);
duke@435	199	return s;
duke@435	200	}
duke@435	201
duke@435	202
duke@435	203
duke@435	204	int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
duke@435	205	if (is_vtable_stub) {
duke@435	206	// Vtable stub size
duke@435	207	return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
duke@435	208	} else {
duke@435	209	// Itable stub size
dcubed@451	210	return (DebugVtables ? 144 : 64) + (CountCompiledCalls ? 6 : 0);
duke@435	211	}
duke@435	212	}
duke@435	213
duke@435	214	int VtableStub::pd_code_alignment() {
duke@435	215	return wordSize;
duke@435	216	}