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src/cpu/x86/vm/compiledIC_x86.cpp@bb1da64b0492 (annotated)

src/cpu/x86/vm/compiledIC_x86.cpp

Fri, 16 Aug 2019 16:50:17 +0200

author

eosterlund

date

Fri, 16 Aug 2019 16:50:17 +0200

changeset 9834

bb1da64b0492

parent 8427

c3d0bd36ab28

child 8604

04d83ba48607

permissions

-rw-r--r--

8229345: Memory leak due to vtable stubs not being shared on SPARC
Reviewed-by: mdoerr, dholmes, kvn

dlong@5000	1	/*
drchase@6680	2	* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
dlong@5000	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
dlong@5000	4	*
dlong@5000	5	* This code is free software; you can redistribute it and/or modify it
dlong@5000	6	* under the terms of the GNU General Public License version 2 only, as
dlong@5000	7	* published by the Free Software Foundation.
dlong@5000	8	*
dlong@5000	9	* This code is distributed in the hope that it will be useful, but WITHOUT
dlong@5000	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
dlong@5000	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dlong@5000	12	* version 2 for more details (a copy is included in the LICENSE file that
dlong@5000	13	* accompanied this code).
dlong@5000	14	*
dlong@5000	15	* You should have received a copy of the GNU General Public License version
dlong@5000	16	* 2 along with this work; if not, write to the Free Software Foundation,
dlong@5000	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
dlong@5000	18	*
dlong@5000	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
dlong@5000	20	* or visit www.oracle.com if you need additional information or have any
dlong@5000	21	* questions.
dlong@5000	22	*
dlong@5000	23	*/
dlong@5000	24
dlong@5000	25	#include "precompiled.hpp"
dlong@5000	26	#include "asm/macroAssembler.inline.hpp"
dlong@5000	27	#include "code/compiledIC.hpp"
dlong@5000	28	#include "code/icBuffer.hpp"
dlong@5000	29	#include "code/nmethod.hpp"
dlong@5000	30	#include "memory/resourceArea.hpp"
dlong@5000	31	#include "runtime/mutexLocker.hpp"
dlong@5000	32	#include "runtime/safepoint.hpp"
dlong@5000	33
dlong@5000	34	// Release the CompiledICHolder* associated with this call site is there is one.
dlong@5000	35	void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
dlong@5000	36	// This call site might have become stale so inspect it carefully.
dlong@5000	37	NativeCall* call = nativeCall_at(call_site->addr());
dlong@5000	38	if (is_icholder_entry(call->destination())) {
dlong@5000	39	NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
dlong@5000	40	InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
dlong@5000	41	}
dlong@5000	42	}
dlong@5000	43
dlong@5000	44	bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
dlong@5000	45	// This call site might have become stale so inspect it carefully.
dlong@5000	46	NativeCall* call = nativeCall_at(call_site->addr());
dlong@5000	47	return is_icholder_entry(call->destination());
dlong@5000	48	}
dlong@5000	49
dlong@5000	50	// ----------------------------------------------------------------------------
dlong@5000	51
dlong@5000	52	#define __ _masm.
vkempik@8427	53	address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
dlong@5000	54	// Stub is fixed up when the corresponding call is converted from
dlong@5000	55	// calling compiled code to calling interpreted code.
dlong@5000	56	// movq rbx, 0
dlong@5000	57	// jmp -5 # to self
dlong@5000	58
dlong@5000	59	address mark = cbuf.insts_mark(); // Get mark within main instrs section.
dlong@5000	60
dlong@5000	61	// Note that the code buffer's insts_mark is always relative to insts.
dlong@5000	62	// That's why we must use the macroassembler to generate a stub.
dlong@5000	63	MacroAssembler _masm(&cbuf);
dlong@5000	64
vkempik@8427	65	address base = __ start_a_stub(to_interp_stub_size());
vkempik@8427	66	if (base == NULL) {
vkempik@8427	67	return NULL; // CodeBuffer::expand failed.
vkempik@8427	68	}
dlong@5000	69	// Static stub relocation stores the instruction address of the call.
dlong@5000	70	__ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
dlong@5000	71	// Static stub relocation also tags the Method* in the code-stream.
dlong@5000	72	__ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time.
dlong@5000	73	// This is recognized as unresolved by relocs/nativeinst/ic code.
dlong@5000	74	__ jump(RuntimeAddress(__ pc()));
dlong@5000	75
dlong@5000	76	// Update current stubs pointer and restore insts_end.
dlong@5000	77	__ end_a_stub();
vkempik@8427	78	return base;
dlong@5000	79	}
dlong@5000	80	#undef __
dlong@5000	81
dlong@5000	82	int CompiledStaticCall::to_interp_stub_size() {
dlong@5000	83	return NOT_LP64(10) // movl; jmp
dlong@5000	84	LP64_ONLY(15); // movq (1+1+8); jmp (1+4)
dlong@5000	85	}
dlong@5000	86
dlong@5000	87	// Relocation entries for call stub, compiled java to interpreter.
dlong@5000	88	int CompiledStaticCall::reloc_to_interp_stub() {
dlong@5000	89	return 4; // 3 in emit_to_interp_stub + 1 in emit_call
dlong@5000	90	}
dlong@5000	91
dlong@5000	92	void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
dlong@5000	93	address stub = find_stub();
dlong@5000	94	guarantee(stub != NULL, "stub not found");
dlong@5000	95
dlong@5000	96	if (TraceICs) {
dlong@5000	97	ResourceMark rm;
dlong@5000	98	tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
drchase@6680	99	p2i(instruction_address()),
dlong@5000	100	callee->name_and_sig_as_C_string());
dlong@5000	101	}
dlong@5000	102
dlong@5000	103	// Creation also verifies the object.
dlong@5000	104	NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
dlong@5000	105	NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
dlong@5000	106
dlong@5000	107	assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
dlong@5000	108	"a) MT-unsafe modification of inline cache");
dlong@5000	109	assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
dlong@5000	110	"b) MT-unsafe modification of inline cache");
dlong@5000	111
dlong@5000	112	// Update stub.
dlong@5000	113	method_holder->set_data((intptr_t)callee());
dlong@5000	114	jump->set_jump_destination(entry);
dlong@5000	115
dlong@5000	116	// Update jump to call.
dlong@5000	117	set_destination_mt_safe(stub);
dlong@5000	118	}
dlong@5000	119
dlong@5000	120	void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
dlong@5000	121	assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
dlong@5000	122	// Reset stub.
dlong@5000	123	address stub = static_stub->addr();
dlong@5000	124	assert(stub != NULL, "stub not found");
dlong@5000	125	// Creation also verifies the object.
dlong@5000	126	NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
dlong@5000	127	NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
dlong@5000	128	method_holder->set_data(0);
dlong@5000	129	jump->set_jump_destination((address)-1);
dlong@5000	130	}
dlong@5000	131
dlong@5000	132	//-----------------------------------------------------------------------------
dlong@5000	133	// Non-product mode code
dlong@5000	134	#ifndef PRODUCT
dlong@5000	135
dlong@5000	136	void CompiledStaticCall::verify() {
dlong@5000	137	// Verify call.
dlong@5000	138	NativeCall::verify();
dlong@5000	139	if (os::is_MP()) {
dlong@5000	140	verify_alignment();
dlong@5000	141	}
dlong@5000	142
dlong@5000	143	// Verify stub.
dlong@5000	144	address stub = find_stub();
dlong@5000	145	assert(stub != NULL, "no stub found for static call");
dlong@5000	146	// Creation also verifies the object.
dlong@5000	147	NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
dlong@5000	148	NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
dlong@5000	149
dlong@5000	150	// Verify state.
dlong@5000	151	assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
dlong@5000	152	}
dlong@5000	153
dlong@5000	154	#endif // !PRODUCT