1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/sparc/vm/runtime_sparc.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,158 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#ifdef COMPILER2
1.30 +#include "asm/macroAssembler.inline.hpp"
1.31 +#include "classfile/systemDictionary.hpp"
1.32 +#include "code/vmreg.hpp"
1.33 +#include "interpreter/interpreter.hpp"
1.34 +#include "nativeInst_sparc.hpp"
1.35 +#include "opto/runtime.hpp"
1.36 +#include "runtime/interfaceSupport.hpp"
1.37 +#include "runtime/sharedRuntime.hpp"
1.38 +#include "runtime/stubRoutines.hpp"
1.39 +#include "runtime/vframeArray.hpp"
1.40 +#include "utilities/globalDefinitions.hpp"
1.41 +#include "vmreg_sparc.inline.hpp"
1.42 +#endif
1.43 +
1.44 +
1.45 +#define __ masm->
1.46 +
1.47 +//------------------------------ generate_exception_blob ---------------------------
1.48 +// creates exception blob at the end
1.49 +// Using exception blob, this code is jumped from a compiled method.
1.50 +// (see emit_exception_handler in sparc.ad file)
1.51 +//
1.52 +// Given an exception pc at a call we call into the runtime for the
1.53 +// handler in this method. This handler might merely restore state
1.54 +// (i.e. callee save registers) unwind the frame and jump to the
1.55 +// exception handler for the nmethod if there is no Java level handler
1.56 +// for the nmethod.
1.57 +//
1.58 +// This code is entered with a jmp.
1.59 +//
1.60 +// Arguments:
1.61 +// O0: exception oop
1.62 +// O1: exception pc
1.63 +//
1.64 +// Results:
1.65 +// O0: exception oop
1.66 +// O1: exception pc in caller or ???
1.67 +// destination: exception handler of caller
1.68 +//
1.69 +// Note: the exception pc MUST be at a call (precise debug information)
1.70 +//
1.71 +void OptoRuntime::generate_exception_blob() {
1.72 + // allocate space for code
1.73 + ResourceMark rm;
1.74 + int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code
1.75 +
1.76 + // setup code generation tools
1.77 + // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread)
1.78 + // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread)
1.79 + CodeBuffer buffer("exception_blob", 600+pad, 512);
1.80 + MacroAssembler* masm = new MacroAssembler(&buffer);
1.81 +
1.82 + int framesize_in_bytes = __ total_frame_size_in_bytes(0);
1.83 + int framesize_in_words = framesize_in_bytes / wordSize;
1.84 + int framesize_in_slots = framesize_in_bytes / sizeof(jint);
1.85 +
1.86 + Label L;
1.87 +
1.88 + int start = __ offset();
1.89 +
1.90 + __ verify_thread();
1.91 + __ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset());
1.92 + __ st_ptr(Oissuing_pc, G2_thread, JavaThread::exception_pc_offset());
1.93 +
1.94 + // This call does all the hard work. It checks if an exception catch
1.95 + // exists in the method.
1.96 + // If so, it returns the handler address.
1.97 + // If the nmethod has been deoptimized and it had a handler the handler
1.98 + // address is the deopt blob unpack_with_exception entry.
1.99 + //
1.100 + // If no handler exists it prepares for stack-unwinding, restoring the callee-save
1.101 + // registers of the frame being removed.
1.102 + //
1.103 + __ save_frame(0);
1.104 +
1.105 + __ mov(G2_thread, O0);
1.106 + __ set_last_Java_frame(SP, noreg);
1.107 + __ save_thread(L7_thread_cache);
1.108 +
1.109 + // This call can block at exit and nmethod can be deoptimized at that
1.110 + // point. If the nmethod had a catch point we would jump to the
1.111 + // now deoptimized catch point and fall thru the vanilla deopt
1.112 + // path and lose the exception
1.113 + // Sure would be simpler if this call didn't block!
1.114 + __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type);
1.115 + __ delayed()->mov(L7_thread_cache, O0);
1.116 +
1.117 + // Set an oopmap for the call site. This oopmap will only be used if we
1.118 + // are unwinding the stack. Hence, all locations will be dead.
1.119 + // Callee-saved registers will be the same as the frame above (i.e.,
1.120 + // handle_exception_stub), since they were restored when we got the
1.121 + // exception.
1.122 +
1.123 + OopMapSet *oop_maps = new OopMapSet();
1.124 + oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0));
1.125 +
1.126 + __ bind(L);
1.127 + __ restore_thread(L7_thread_cache);
1.128 + __ reset_last_Java_frame();
1.129 +
1.130 + __ mov(O0, G3_scratch); // Move handler address to temp
1.131 + __ restore();
1.132 +
1.133 + // Restore SP from L7 if the exception PC is a MethodHandle call site.
1.134 + __ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), O7);
1.135 + __ tst(O7);
1.136 + __ movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP);
1.137 +
1.138 + // G3_scratch contains handler address
1.139 + // Since this may be the deopt blob we must set O7 to look like we returned
1.140 + // from the original pc that threw the exception
1.141 +
1.142 + __ ld_ptr(G2_thread, JavaThread::exception_pc_offset(), O7);
1.143 + __ sub(O7, frame::pc_return_offset, O7);
1.144 +
1.145 +
1.146 + assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot");
1.147 + __ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception); // O0
1.148 +#ifdef ASSERT
1.149 + __ st_ptr(G0, G2_thread, JavaThread::exception_handler_pc_offset());
1.150 + __ st_ptr(G0, G2_thread, JavaThread::exception_pc_offset());
1.151 +#endif
1.152 + __ JMP(G3_scratch, 0);
1.153 + // Clear the exception oop so GC no longer processes it as a root.
1.154 + __ delayed()->st_ptr(G0, G2_thread, JavaThread::exception_oop_offset());
1.155 +
1.156 + // -------------
1.157 + // make sure all code is generated
1.158 + masm->flush();
1.159 +
1.160 + _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words);
1.161 +}
