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src/cpu/sparc/vm/runtime_sparc.cpp@f90c822e73f8 (annotated)

src/cpu/sparc/vm/runtime_sparc.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#ifdef COMPILER2
aoqi@0	27	#include "asm/macroAssembler.inline.hpp"
aoqi@0	28	#include "classfile/systemDictionary.hpp"
aoqi@0	29	#include "code/vmreg.hpp"
aoqi@0	30	#include "interpreter/interpreter.hpp"
aoqi@0	31	#include "nativeInst_sparc.hpp"
aoqi@0	32	#include "opto/runtime.hpp"
aoqi@0	33	#include "runtime/interfaceSupport.hpp"
aoqi@0	34	#include "runtime/sharedRuntime.hpp"
aoqi@0	35	#include "runtime/stubRoutines.hpp"
aoqi@0	36	#include "runtime/vframeArray.hpp"
aoqi@0	37	#include "utilities/globalDefinitions.hpp"
aoqi@0	38	#include "vmreg_sparc.inline.hpp"
aoqi@0	39	#endif
aoqi@0	40
aoqi@0	41
aoqi@0	42	#define __ masm->
aoqi@0	43
aoqi@0	44	//------------------------------ generate_exception_blob ---------------------------
aoqi@0	45	// creates exception blob at the end
aoqi@0	46	// Using exception blob, this code is jumped from a compiled method.
aoqi@0	47	// (see emit_exception_handler in sparc.ad file)
aoqi@0	48	//
aoqi@0	49	// Given an exception pc at a call we call into the runtime for the
aoqi@0	50	// handler in this method. This handler might merely restore state
aoqi@0	51	// (i.e. callee save registers) unwind the frame and jump to the
aoqi@0	52	// exception handler for the nmethod if there is no Java level handler
aoqi@0	53	// for the nmethod.
aoqi@0	54	//
aoqi@0	55	// This code is entered with a jmp.
aoqi@0	56	//
aoqi@0	57	// Arguments:
aoqi@0	58	// O0: exception oop
aoqi@0	59	// O1: exception pc
aoqi@0	60	//
aoqi@0	61	// Results:
aoqi@0	62	// O0: exception oop
aoqi@0	63	// O1: exception pc in caller or ???
aoqi@0	64	// destination: exception handler of caller
aoqi@0	65	//
aoqi@0	66	// Note: the exception pc MUST be at a call (precise debug information)
aoqi@0	67	//
aoqi@0	68	void OptoRuntime::generate_exception_blob() {
aoqi@0	69	// allocate space for code
aoqi@0	70	ResourceMark rm;
aoqi@0	71	int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code
aoqi@0	72
aoqi@0	73	// setup code generation tools
aoqi@0	74	// Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread)
aoqi@0	75	// Measured 8/7/03 at 528 in 32bit debug build (VerifyThread)
aoqi@0	76	CodeBuffer buffer("exception_blob", 600+pad, 512);
aoqi@0	77	MacroAssembler* masm = new MacroAssembler(&buffer);
aoqi@0	78
aoqi@0	79	int framesize_in_bytes = __ total_frame_size_in_bytes(0);
aoqi@0	80	int framesize_in_words = framesize_in_bytes / wordSize;
aoqi@0	81	int framesize_in_slots = framesize_in_bytes / sizeof(jint);
aoqi@0	82
aoqi@0	83	Label L;
aoqi@0	84
aoqi@0	85	int start = __ offset();
aoqi@0	86
aoqi@0	87	__ verify_thread();
aoqi@0	88	__ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset());
aoqi@0	89	__ st_ptr(Oissuing_pc, G2_thread, JavaThread::exception_pc_offset());
aoqi@0	90
aoqi@0	91	// This call does all the hard work. It checks if an exception catch
aoqi@0	92	// exists in the method.
aoqi@0	93	// If so, it returns the handler address.
aoqi@0	94	// If the nmethod has been deoptimized and it had a handler the handler
aoqi@0	95	// address is the deopt blob unpack_with_exception entry.
aoqi@0	96	//
aoqi@0	97	// If no handler exists it prepares for stack-unwinding, restoring the callee-save
aoqi@0	98	// registers of the frame being removed.
aoqi@0	99	//
aoqi@0	100	__ save_frame(0);
aoqi@0	101
aoqi@0	102	__ mov(G2_thread, O0);
aoqi@0	103	__ set_last_Java_frame(SP, noreg);
aoqi@0	104	__ save_thread(L7_thread_cache);
aoqi@0	105
aoqi@0	106	// This call can block at exit and nmethod can be deoptimized at that
aoqi@0	107	// point. If the nmethod had a catch point we would jump to the
aoqi@0	108	// now deoptimized catch point and fall thru the vanilla deopt
aoqi@0	109	// path and lose the exception
aoqi@0	110	// Sure would be simpler if this call didn't block!
aoqi@0	111	__ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type);
aoqi@0	112	__ delayed()->mov(L7_thread_cache, O0);
aoqi@0	113
aoqi@0	114	// Set an oopmap for the call site. This oopmap will only be used if we
aoqi@0	115	// are unwinding the stack. Hence, all locations will be dead.
aoqi@0	116	// Callee-saved registers will be the same as the frame above (i.e.,
aoqi@0	117	// handle_exception_stub), since they were restored when we got the
aoqi@0	118	// exception.
aoqi@0	119
aoqi@0	120	OopMapSet *oop_maps = new OopMapSet();
aoqi@0	121	oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0));
aoqi@0	122
aoqi@0	123	__ bind(L);
aoqi@0	124	__ restore_thread(L7_thread_cache);
aoqi@0	125	__ reset_last_Java_frame();
aoqi@0	126
aoqi@0	127	__ mov(O0, G3_scratch); // Move handler address to temp
aoqi@0	128	__ restore();
aoqi@0	129
aoqi@0	130	// Restore SP from L7 if the exception PC is a MethodHandle call site.
aoqi@0	131	__ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), O7);
aoqi@0	132	__ tst(O7);
aoqi@0	133	__ movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP);
aoqi@0	134
aoqi@0	135	// G3_scratch contains handler address
aoqi@0	136	// Since this may be the deopt blob we must set O7 to look like we returned
aoqi@0	137	// from the original pc that threw the exception
aoqi@0	138
aoqi@0	139	__ ld_ptr(G2_thread, JavaThread::exception_pc_offset(), O7);
aoqi@0	140	__ sub(O7, frame::pc_return_offset, O7);
aoqi@0	141
aoqi@0	142
aoqi@0	143	assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot");
aoqi@0	144	__ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception); // O0
aoqi@0	145	#ifdef ASSERT
aoqi@0	146	__ st_ptr(G0, G2_thread, JavaThread::exception_handler_pc_offset());
aoqi@0	147	__ st_ptr(G0, G2_thread, JavaThread::exception_pc_offset());
aoqi@0	148	#endif
aoqi@0	149	__ JMP(G3_scratch, 0);
aoqi@0	150	// Clear the exception oop so GC no longer processes it as a root.
aoqi@0	151	__ delayed()->st_ptr(G0, G2_thread, JavaThread::exception_oop_offset());
aoqi@0	152
aoqi@0	153	// -------------
aoqi@0	154	// make sure all code is generated
aoqi@0	155	masm->flush();
aoqi@0	156
aoqi@0	157	_exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words);
aoqi@0	158	}