• file
• revisions
• annotate
• diff
• comparison
• raw

src/cpu/sparc/vm/runtime_sparc.cpp@9c2ecc2ffb12 (annotated)

src/cpu/sparc/vm/runtime_sparc.cpp

Fri, 11 Jul 2008 01:14:44 -0700

author

trims

date

Fri, 11 Jul 2008 01:14:44 -0700

changeset 670

9c2ecc2ffb12

parent 435

a61af66fc99e

child 1162

6b2273dd6fa9

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 1998-2006 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/_runtime_sparc.cpp.incl"
duke@435	27
duke@435	28
duke@435	29	#define __ masm->
duke@435	30
duke@435	31	ExceptionBlob *OptoRuntime::_exception_blob;
duke@435	32
duke@435	33	//------------------------------ generate_exception_blob ---------------------------
duke@435	34	// creates exception blob at the end
duke@435	35	// Using exception blob, this code is jumped from a compiled method.
duke@435	36	// (see emit_exception_handler in sparc.ad file)
duke@435	37	//
duke@435	38	// Given an exception pc at a call we call into the runtime for the
duke@435	39	// handler in this method. This handler might merely restore state
duke@435	40	// (i.e. callee save registers) unwind the frame and jump to the
duke@435	41	// exception handler for the nmethod if there is no Java level handler
duke@435	42	// for the nmethod.
duke@435	43	//
duke@435	44	// This code is entered with a jmp.
duke@435	45	//
duke@435	46	// Arguments:
duke@435	47	// O0: exception oop
duke@435	48	// O1: exception pc
duke@435	49	//
duke@435	50	// Results:
duke@435	51	// O0: exception oop
duke@435	52	// O1: exception pc in caller or ???
duke@435	53	// destination: exception handler of caller
duke@435	54	//
duke@435	55	// Note: the exception pc MUST be at a call (precise debug information)
duke@435	56	//
duke@435	57	void OptoRuntime::generate_exception_blob() {
duke@435	58	// allocate space for code
duke@435	59	ResourceMark rm;
duke@435	60	int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code
duke@435	61
duke@435	62	// setup code generation tools
duke@435	63	// Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread)
duke@435	64	// Measured 8/7/03 at 528 in 32bit debug build (VerifyThread)
duke@435	65	CodeBuffer buffer("exception_blob", 600+pad, 512);
duke@435	66	MacroAssembler* masm = new MacroAssembler(&buffer);
duke@435	67
duke@435	68	int framesize_in_bytes = __ total_frame_size_in_bytes(0);
duke@435	69	int framesize_in_words = framesize_in_bytes / wordSize;
duke@435	70	int framesize_in_slots = framesize_in_bytes / sizeof(jint);
duke@435	71
duke@435	72	Label L;
duke@435	73
duke@435	74	int start = __ offset();
duke@435	75
duke@435	76	__ verify_thread();
duke@435	77	__ st_ptr(Oexception, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())));
duke@435	78	__ st_ptr(Oissuing_pc, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())));
duke@435	79
duke@435	80	// This call does all the hard work. It checks if an exception catch
duke@435	81	// exists in the method.
duke@435	82	// If so, it returns the handler address.
duke@435	83	// If the nmethod has been deoptimized and it had a handler the handler
duke@435	84	// address is the deopt blob unpack_with_exception entry.
duke@435	85	//
duke@435	86	// If no handler exists it prepares for stack-unwinding, restoring the callee-save
duke@435	87	// registers of the frame being removed.
duke@435	88	//
duke@435	89	__ save_frame(0);
duke@435	90
duke@435	91	__ mov(G2_thread, O0);
duke@435	92	__ set_last_Java_frame(SP, noreg);
duke@435	93	__ save_thread(L7_thread_cache);
duke@435	94
duke@435	95	// This call can block at exit and nmethod can be deoptimized at that
duke@435	96	// point. If the nmethod had a catch point we would jump to the
duke@435	97	// now deoptimized catch point and fall thru the vanilla deopt
duke@435	98	// path and lose the exception
duke@435	99	// Sure would be simpler if this call didn't block!
duke@435	100	__ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type);
duke@435	101	__ delayed()->mov(L7_thread_cache, O0);
duke@435	102
duke@435	103	// Set an oopmap for the call site. This oopmap will only be used if we
duke@435	104	// are unwinding the stack. Hence, all locations will be dead.
duke@435	105	// Callee-saved registers will be the same as the frame above (i.e.,
duke@435	106	// handle_exception_stub), since they were restored when we got the
duke@435	107	// exception.
duke@435	108
duke@435	109	OopMapSet *oop_maps = new OopMapSet();
duke@435	110	oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0));
duke@435	111
duke@435	112	__ bind(L);
duke@435	113	__ restore_thread(L7_thread_cache);
duke@435	114	__ reset_last_Java_frame();
duke@435	115
duke@435	116	__ mov(O0, G3_scratch); // Move handler address to temp
duke@435	117	__ restore();
duke@435	118
duke@435	119	// G3_scratch contains handler address
duke@435	120	// Since this may be the deopt blob we must set O7 to look like we returned
duke@435	121	// from the original pc that threw the exception
duke@435	122
duke@435	123	__ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())), O7);
duke@435	124	__ sub(O7, frame::pc_return_offset, O7);
duke@435	125
duke@435	126
duke@435	127	assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot");
duke@435	128	__ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())), Oexception); // O0
duke@435	129	#ifdef ASSERT
duke@435	130	__ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_handler_pc_offset())));
duke@435	131	__ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())));
duke@435	132	#endif
duke@435	133	__ JMP(G3_scratch, 0);
duke@435	134	// Clear the exception oop so GC no longer processes it as a root.
duke@435	135	__ delayed()->st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())));
duke@435	136
duke@435	137	// -------------
duke@435	138	// make sure all code is generated
duke@435	139	masm->flush();
duke@435	140
duke@435	141	_exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words);
duke@435	142	}