jdk8-mips64-public/hotspot: src/cpu/x86/vm/runtime_x86

src/cpu/x86/vm/runtime_x86_32.cpp@70aa912cebe5 (annotated)

src/cpu/x86/vm/runtime_x86_32.cpp

Wed, 15 Apr 2020 11:49:55 +0800

author: aoqi
date: Wed, 15 Apr 2020 11:49:55 +0800
changeset 9852: 70aa912cebe5
parent 9041: 95a08233f46c
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #ifdef COMPILER2
 #include "asm/macroAssembler.hpp"
 #include "asm/macroAssembler.inline.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/vmreg.hpp"
 #include "interpreter/interpreter.hpp"
 #include "opto/runtime.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/vframeArray.hpp"
 #include "utilities/globalDefinitions.hpp"
 #include "vmreg_x86.inline.hpp"
 #endif
 #define __ masm->
 //------------------------------generate_exception_blob---------------------------
 // creates exception blob at the end
 // Using exception blob, this code is jumped from a compiled method.
 //
 // Given an exception pc at a call we call into the runtime for the
 // handler in this method. This handler might merely restore state
 // (i.e. callee save registers) unwind the frame and jump to the
 // exception handler for the nmethod if there is no Java level handler
 // for the nmethod.
 //
 // This code is entered with a jmp.
 //
 // Arguments:
 //   rax: exception oop
 //   rdx: exception pc
 //
 // Results:
 //   rax: exception oop
 //   rdx: exception pc in caller or ???
 //   destination: exception handler of caller
 //
 // Note: the exception pc MUST be at a call (precise debug information)
 //       Only register rax, rdx, rcx are not callee saved.
 //
 void OptoRuntime::generate_exception_blob() {
   // Capture info about frame layout
   enum layout {
     thread_off,                 // last_java_sp
     // The frame sender code expects that rbp will be in the "natural" place and
     // will override any oopMap setting for it. We must therefore force the layout
     // so that it agrees with the frame sender code.
     rbp_off,
     return_off,                 // slot for return address
     framesize
   };
   // allocate space for the code
   ResourceMark rm;
   // setup code generation tools
   CodeBuffer   buffer("exception_blob", 512, 512);
   MacroAssembler* masm = new MacroAssembler(&buffer);
   OopMapSet *oop_maps = new OopMapSet();
   address start = __ pc();
   __ push(rdx);
   __ subptr(rsp, return_off * wordSize);   // Prolog!
   // rbp, location is implicitly known
   __ movptr(Address(rsp,rbp_off  *wordSize), rbp);
   // Store exception in Thread object. We cannot pass any arguments to the
   // handle_exception call, since we do not want to make any assumption
   // about the size of the frame where the exception happened in.
   __ get_thread(rcx);
   __ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax);
   __ movptr(Address(rcx, JavaThread::exception_pc_offset()),  rdx);
   // This call does all the hard work.  It checks if an exception handler
   // exists in the method.
   // If so, it returns the handler address.
   // If not, it prepares for stack-unwinding, restoring the callee-save
   // registers of the frame being removed.
   //
   __ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument
   __ set_last_Java_frame(rcx, noreg, noreg, NULL);
   __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
   // No registers to map, rbp is known implicitly
   oop_maps->add_gc_map( __ pc() - start,  new OopMap( framesize, 0 ));
   __ get_thread(rcx);
   __ reset_last_Java_frame(rcx, false);
   // Restore callee-saved registers
   __ movptr(rbp, Address(rsp, rbp_off * wordSize));
   __ addptr(rsp, return_off * wordSize);   // Epilog!
   __ pop(rdx); // Exception pc
   // rax: exception handler for given <exception oop/exception pc>
   // We have a handler in rax, (could be deopt blob)
   // rdx - throwing pc, deopt blob will need it.
   __ push(rax);
   // Get the exception
   __ movptr(rax, Address(rcx, JavaThread::exception_oop_offset()));
   // Get the exception pc in case we are deoptimized
   __ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset()));
 #ifdef ASSERT
   __ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD);
   __ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD);
 #endif
   // Clear the exception oop so GC no longer processes it as a root.
   __ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD);
   __ pop(rcx);
   // rax: exception oop
   // rcx: exception handler
   // rdx: exception pc
   __ jmp (rcx);
   // -------------
   // make sure all code is generated
   masm->flush();
   _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/runtime_x86_32.cpp@70aa912cebe5 (annotated)

src/cpu/x86/vm/runtime_x86_32.cpp