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src/cpu/x86/vm/runtime_x86_32.cpp@bb1da64b0492 (annotated)

src/cpu/x86/vm/runtime_x86_32.cpp

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

author

eosterlund

date

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

changeset 9834

bb1da64b0492

parent 8877

f04097176542

child 9041

95a08233f46c

permissions

-rw-r--r--

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

duke@435	1	/*
never@2950	2	* Copyright (c) 1998, 2011, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#ifdef COMPILER2
twisti@4318	27	#include "asm/macroAssembler.hpp"
twisti@4318	28	#include "asm/macroAssembler.inline.hpp"
stefank@2314	29	#include "classfile/systemDictionary.hpp"
stefank@2314	30	#include "code/vmreg.hpp"
stefank@2314	31	#include "interpreter/interpreter.hpp"
stefank@2314	32	#include "opto/runtime.hpp"
stefank@2314	33	#include "runtime/interfaceSupport.hpp"
stefank@2314	34	#include "runtime/sharedRuntime.hpp"
stefank@2314	35	#include "runtime/stubRoutines.hpp"
stefank@2314	36	#include "runtime/vframeArray.hpp"
stefank@2314	37	#include "utilities/globalDefinitions.hpp"
stefank@2314	38	#include "vmreg_x86.inline.hpp"
stefank@2314	39	#endif
duke@435	40
duke@435	41
duke@435	42	#define __ masm->
duke@435	43
duke@435	44	//------------------------------generate_exception_blob---------------------------
duke@435	45	// creates exception blob at the end
duke@435	46	// Using exception blob, this code is jumped from a compiled method.
duke@435	47	//
duke@435	48	// Given an exception pc at a call we call into the runtime for the
duke@435	49	// handler in this method. This handler might merely restore state
duke@435	50	// (i.e. callee save registers) unwind the frame and jump to the
duke@435	51	// exception handler for the nmethod if there is no Java level handler
duke@435	52	// for the nmethod.
duke@435	53	//
duke@435	54	// This code is entered with a jmp.
duke@435	55	//
duke@435	56	// Arguments:
twisti@1570	57	// rax: exception oop
duke@435	58	// rdx: exception pc
duke@435	59	//
duke@435	60	// Results:
twisti@1570	61	// rax: exception oop
duke@435	62	// rdx: exception pc in caller or ???
duke@435	63	// destination: exception handler of caller
duke@435	64	//
duke@435	65	// Note: the exception pc MUST be at a call (precise debug information)
duke@435	66	// Only register rax, rdx, rcx are not callee saved.
duke@435	67	//
duke@435	68
duke@435	69	void OptoRuntime::generate_exception_blob() {
duke@435	70
duke@435	71	// Capture info about frame layout
duke@435	72	enum layout {
duke@435	73	thread_off, // last_java_sp
duke@435	74	// The frame sender code expects that rbp will be in the "natural" place and
duke@435	75	// will override any oopMap setting for it. We must therefore force the layout
duke@435	76	// so that it agrees with the frame sender code.
duke@435	77	rbp_off,
duke@435	78	return_off, // slot for return address
duke@435	79	framesize
duke@435	80	};
duke@435	81
duke@435	82	// allocate space for the code
duke@435	83	ResourceMark rm;
duke@435	84	// setup code generation tools
duke@435	85	CodeBuffer buffer("exception_blob", 512, 512);
duke@435	86	MacroAssembler* masm = new MacroAssembler(&buffer);
duke@435	87
duke@435	88	OopMapSet *oop_maps = new OopMapSet();
duke@435	89
duke@435	90	address start = __ pc();
duke@435	91
never@739	92	__ push(rdx);
never@739	93	__ subptr(rsp, return_off * wordSize); // Prolog!
duke@435	94
duke@435	95	// rbp, location is implicitly known
never@739	96	__ movptr(Address(rsp,rbp_off *wordSize), rbp);
duke@435	97
duke@435	98	// Store exception in Thread object. We cannot pass any arguments to the
duke@435	99	// handle_exception call, since we do not want to make any assumption
duke@435	100	// about the size of the frame where the exception happened in.
duke@435	101	__ get_thread(rcx);
never@739	102	__ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax);
never@739	103	__ movptr(Address(rcx, JavaThread::exception_pc_offset()), rdx);
duke@435	104
duke@435	105	// This call does all the hard work. It checks if an exception handler
duke@435	106	// exists in the method.
duke@435	107	// If so, it returns the handler address.
duke@435	108	// If not, it prepares for stack-unwinding, restoring the callee-save
duke@435	109	// registers of the frame being removed.
duke@435	110	//
never@739	111	__ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument
duke@435	112	__ set_last_Java_frame(rcx, noreg, noreg, NULL);
duke@435	113
duke@435	114	__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
duke@435	115
duke@435	116	// No registers to map, rbp is known implicitly
duke@435	117	oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 ));
duke@435	118	__ get_thread(rcx);
kevinw@8877	119	__ reset_last_Java_frame(rcx, false);
duke@435	120
duke@435	121	// Restore callee-saved registers
never@739	122	__ movptr(rbp, Address(rsp, rbp_off * wordSize));
duke@435	123
never@739	124	__ addptr(rsp, return_off * wordSize); // Epilog!
never@739	125	__ pop(rdx); // Exception pc
duke@435	126
twisti@1570	127	// rax: exception handler for given <exception oop/exception pc>
duke@435	128
duke@435	129	// We have a handler in rax, (could be deopt blob)
duke@435	130	// rdx - throwing pc, deopt blob will need it.
duke@435	131
never@739	132	__ push(rax);
duke@435	133
duke@435	134	// Get the exception
never@739	135	__ movptr(rax, Address(rcx, JavaThread::exception_oop_offset()));
duke@435	136	// Get the exception pc in case we are deoptimized
never@739	137	__ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset()));
duke@435	138	#ifdef ASSERT
xlu@947	139	__ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD);
xlu@947	140	__ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD);
duke@435	141	#endif
duke@435	142	// Clear the exception oop so GC no longer processes it as a root.
xlu@947	143	__ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD);
duke@435	144
never@739	145	__ pop(rcx);
duke@435	146
twisti@1570	147	// rax: exception oop
duke@435	148	// rcx: exception handler
duke@435	149	// rdx: exception pc
duke@435	150	__ jmp (rcx);
duke@435	151
duke@435	152	// -------------
duke@435	153	// make sure all code is generated
duke@435	154	masm->flush();
duke@435	155
duke@435	156	_exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
duke@435	157	}