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src/cpu/x86/vm/runtime_x86_32.cpp@f95d63e2154a (annotated)

src/cpu/x86/vm/runtime_x86_32.cpp

Tue, 23 Nov 2010 13:22:55 -0800

author

stefank

date

Tue, 23 Nov 2010 13:22:55 -0800

changeset 2314

f95d63e2154a

parent 1934

e9ff18c4ace7

child 2950

cba7b5c2d53f

permissions

-rw-r--r--

6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg

duke@435	1	/*
jrose@1934	2	* Copyright (c) 1998, 2010, 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
stefank@2314	27	#include "asm/assembler.hpp"
stefank@2314	28	#include "assembler_x86.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 "nativeInst_x86.hpp"
stefank@2314	33	#include "opto/runtime.hpp"
stefank@2314	34	#include "runtime/interfaceSupport.hpp"
stefank@2314	35	#include "runtime/sharedRuntime.hpp"
stefank@2314	36	#include "runtime/stubRoutines.hpp"
stefank@2314	37	#include "runtime/vframeArray.hpp"
stefank@2314	38	#include "utilities/globalDefinitions.hpp"
stefank@2314	39	#include "vmreg_x86.inline.hpp"
stefank@2314	40	#endif
duke@435	41
duke@435	42
duke@435	43	#define __ masm->
duke@435	44
duke@435	45	ExceptionBlob* OptoRuntime::_exception_blob;
duke@435	46
duke@435	47	//------------------------------generate_exception_blob---------------------------
duke@435	48	// creates exception blob at the end
duke@435	49	// Using exception blob, this code is jumped from a compiled method.
duke@435	50	//
duke@435	51	// Given an exception pc at a call we call into the runtime for the
duke@435	52	// handler in this method. This handler might merely restore state
duke@435	53	// (i.e. callee save registers) unwind the frame and jump to the
duke@435	54	// exception handler for the nmethod if there is no Java level handler
duke@435	55	// for the nmethod.
duke@435	56	//
duke@435	57	// This code is entered with a jmp.
duke@435	58	//
duke@435	59	// Arguments:
twisti@1570	60	// rax: exception oop
duke@435	61	// rdx: exception pc
duke@435	62	//
duke@435	63	// Results:
twisti@1570	64	// rax: exception oop
duke@435	65	// rdx: exception pc in caller or ???
duke@435	66	// destination: exception handler of caller
duke@435	67	//
duke@435	68	// Note: the exception pc MUST be at a call (precise debug information)
duke@435	69	// Only register rax, rdx, rcx are not callee saved.
duke@435	70	//
duke@435	71
duke@435	72	void OptoRuntime::generate_exception_blob() {
duke@435	73
duke@435	74	// Capture info about frame layout
duke@435	75	enum layout {
duke@435	76	thread_off, // last_java_sp
duke@435	77	// The frame sender code expects that rbp will be in the "natural" place and
duke@435	78	// will override any oopMap setting for it. We must therefore force the layout
duke@435	79	// so that it agrees with the frame sender code.
duke@435	80	rbp_off,
duke@435	81	return_off, // slot for return address
duke@435	82	framesize
duke@435	83	};
duke@435	84
duke@435	85	// allocate space for the code
duke@435	86	ResourceMark rm;
duke@435	87	// setup code generation tools
duke@435	88	CodeBuffer buffer("exception_blob", 512, 512);
duke@435	89	MacroAssembler* masm = new MacroAssembler(&buffer);
duke@435	90
duke@435	91	OopMapSet *oop_maps = new OopMapSet();
duke@435	92
duke@435	93	address start = __ pc();
duke@435	94
never@739	95	__ push(rdx);
never@739	96	__ subptr(rsp, return_off * wordSize); // Prolog!
duke@435	97
duke@435	98	// rbp, location is implicitly known
never@739	99	__ movptr(Address(rsp,rbp_off *wordSize), rbp);
duke@435	100
duke@435	101	// Store exception in Thread object. We cannot pass any arguments to the
duke@435	102	// handle_exception call, since we do not want to make any assumption
duke@435	103	// about the size of the frame where the exception happened in.
duke@435	104	__ get_thread(rcx);
never@739	105	__ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax);
never@739	106	__ movptr(Address(rcx, JavaThread::exception_pc_offset()), rdx);
duke@435	107
duke@435	108	// This call does all the hard work. It checks if an exception handler
duke@435	109	// exists in the method.
duke@435	110	// If so, it returns the handler address.
duke@435	111	// If not, it prepares for stack-unwinding, restoring the callee-save
duke@435	112	// registers of the frame being removed.
duke@435	113	//
never@739	114	__ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument
duke@435	115	__ set_last_Java_frame(rcx, noreg, noreg, NULL);
duke@435	116
duke@435	117	__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
duke@435	118
duke@435	119	// No registers to map, rbp is known implicitly
duke@435	120	oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 ));
duke@435	121	__ get_thread(rcx);
duke@435	122	__ reset_last_Java_frame(rcx, false, false);
duke@435	123
duke@435	124	// Restore callee-saved registers
never@739	125	__ movptr(rbp, Address(rsp, rbp_off * wordSize));
duke@435	126
never@739	127	__ addptr(rsp, return_off * wordSize); // Epilog!
never@739	128	__ pop(rdx); // Exception pc
duke@435	129
twisti@1570	130	// rax: exception handler for given <exception oop/exception pc>
duke@435	131
twisti@1803	132	// Restore SP from BP if the exception PC is a MethodHandle call site.
twisti@1803	133	__ cmpl(Address(rcx, JavaThread::is_method_handle_return_offset()), 0);
twisti@1922	134	__ cmovptr(Assembler::notEqual, rsp, rbp_mh_SP_save);
duke@435	135
duke@435	136	// We have a handler in rax, (could be deopt blob)
duke@435	137	// rdx - throwing pc, deopt blob will need it.
duke@435	138
never@739	139	__ push(rax);
duke@435	140
duke@435	141	// Get the exception
never@739	142	__ movptr(rax, Address(rcx, JavaThread::exception_oop_offset()));
duke@435	143	// Get the exception pc in case we are deoptimized
never@739	144	__ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset()));
duke@435	145	#ifdef ASSERT
xlu@947	146	__ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD);
xlu@947	147	__ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD);
duke@435	148	#endif
duke@435	149	// Clear the exception oop so GC no longer processes it as a root.
xlu@947	150	__ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD);
duke@435	151
never@739	152	__ pop(rcx);
duke@435	153
twisti@1570	154	// rax: exception oop
duke@435	155	// rcx: exception handler
duke@435	156	// rdx: exception pc
duke@435	157	__ jmp (rcx);
duke@435	158
duke@435	159	// -------------
duke@435	160	// make sure all code is generated
duke@435	161	masm->flush();
duke@435	162
duke@435	163	_exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
duke@435	164	}