view src/share/vm/interpreter/interpreter.cpp @ 2352:e1162778c1c8

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer. Reviewed-by: kvn, iveresov, never, tonyp, dholmes
author johnc
date Thu, 07 Apr 2011 09:53:20 -0700
parents 3582bf76420e
children 6759698e3140
line wrap: on
line source
/*
 * Copyright (c) 1997, 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"
#include "asm/assembler.hpp"
#include "interpreter/bytecodeHistogram.hpp"
#include "interpreter/bytecodeInterpreter.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/templateTable.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/resourceArea.hpp"
#include "oops/arrayOop.hpp"
#include "oops/methodDataOop.hpp"
#include "oops/methodOop.hpp"
#include "oops/oop.inline.hpp"
#include "prims/forte.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/timer.hpp"

# define __ _masm->


//------------------------------------------------------------------------------------------------------------------------
// Implementation of InterpreterCodelet

void InterpreterCodelet::initialize(const char* description, Bytecodes::Code bytecode) {
  _description       = description;
  _bytecode          = bytecode;
}


void InterpreterCodelet::verify() {
}


void InterpreterCodelet::print_on(outputStream* st) const {
  if (PrintInterpreter) {
    st->cr();
    st->print_cr("----------------------------------------------------------------------");
  }

  if (description() != NULL) st->print("%s  ", description());
  if (bytecode()    >= 0   ) st->print("%d %s  ", bytecode(), Bytecodes::name(bytecode()));
  st->print_cr("[" INTPTR_FORMAT ", " INTPTR_FORMAT "]  %d bytes",
                code_begin(), code_end(), code_size());

  if (PrintInterpreter) {
    st->cr();
    Disassembler::decode(code_begin(), code_end(), st);
  }
}


//------------------------------------------------------------------------------------------------------------------------
// Implementation of  platform independent aspects of Interpreter

void AbstractInterpreter::initialize() {
  if (_code != NULL) return;

  // make sure 'imported' classes are initialized
  if (CountBytecodes || TraceBytecodes || StopInterpreterAt) BytecodeCounter::reset();
  if (PrintBytecodeHistogram)                                BytecodeHistogram::reset();
  if (PrintBytecodePairHistogram)                            BytecodePairHistogram::reset();

  InvocationCounter::reinitialize(DelayCompilationDuringStartup);

}

void AbstractInterpreter::print() {
  tty->cr();
  tty->print_cr("----------------------------------------------------------------------");
  tty->print_cr("Interpreter");
  tty->cr();
  tty->print_cr("code size        = %6dK bytes", (int)_code->used_space()/1024);
  tty->print_cr("total space      = %6dK bytes", (int)_code->total_space()/1024);
  tty->print_cr("wasted space     = %6dK bytes", (int)_code->available_space()/1024);
  tty->cr();
  tty->print_cr("# of codelets    = %6d"      , _code->number_of_stubs());
  tty->print_cr("avg codelet size = %6d bytes", _code->used_space() / _code->number_of_stubs());
  tty->cr();
  _code->print();
  tty->print_cr("----------------------------------------------------------------------");
  tty->cr();
}


void interpreter_init() {
  Interpreter::initialize();
#ifndef PRODUCT
  if (TraceBytecodes) BytecodeTracer::set_closure(BytecodeTracer::std_closure());
#endif // PRODUCT
  // need to hit every safepoint in order to call zapping routine
  // register the interpreter
  Forte::register_stub(
    "Interpreter",
    AbstractInterpreter::code()->code_start(),
    AbstractInterpreter::code()->code_end()
  );

  // notify JVMTI profiler
  if (JvmtiExport::should_post_dynamic_code_generated()) {
    JvmtiExport::post_dynamic_code_generated("Interpreter",
                                             AbstractInterpreter::code()->code_start(),
                                             AbstractInterpreter::code()->code_end());
  }
}

//------------------------------------------------------------------------------------------------------------------------
// Implementation of interpreter

StubQueue* AbstractInterpreter::_code                                       = NULL;
bool       AbstractInterpreter::_notice_safepoints                          = false;
address    AbstractInterpreter::_rethrow_exception_entry                    = NULL;

address    AbstractInterpreter::_native_entry_begin                         = NULL;
address    AbstractInterpreter::_native_entry_end                           = NULL;
address    AbstractInterpreter::_slow_signature_handler;
address    AbstractInterpreter::_entry_table            [AbstractInterpreter::number_of_method_entries];
address    AbstractInterpreter::_native_abi_to_tosca    [AbstractInterpreter::number_of_result_handlers];

//------------------------------------------------------------------------------------------------------------------------
// Generation of complete interpreter

AbstractInterpreterGenerator::AbstractInterpreterGenerator(StubQueue* _code) {
  _masm                      = NULL;
}


static const BasicType types[Interpreter::number_of_result_handlers] = {
  T_BOOLEAN,
  T_CHAR   ,
  T_BYTE   ,
  T_SHORT  ,
  T_INT    ,
  T_LONG   ,
  T_VOID   ,
  T_FLOAT  ,
  T_DOUBLE ,
  T_OBJECT
};

void AbstractInterpreterGenerator::generate_all() {


  { CodeletMark cm(_masm, "slow signature handler");
    Interpreter::_slow_signature_handler = generate_slow_signature_handler();
  }

}

//------------------------------------------------------------------------------------------------------------------------
// Entry points

AbstractInterpreter::MethodKind AbstractInterpreter::method_kind(methodHandle m) {
  // Abstract method?
  if (m->is_abstract()) return abstract;

  // Invoker for method handles?
  if (m->is_method_handle_invoke())  return method_handle;

  // Native method?
  // Note: This test must come _before_ the test for intrinsic
  //       methods. See also comments below.
  if (m->is_native()) {
    assert(!m->is_method_handle_invoke(), "overlapping bits here, watch out");
    return m->is_synchronized() ? native_synchronized : native;
  }

  // Synchronized?
  if (m->is_synchronized()) {
    return zerolocals_synchronized;
  }

  if (RegisterFinalizersAtInit && m->code_size() == 1 &&
      m->intrinsic_id() == vmIntrinsics::_Object_init) {
    // We need to execute the special return bytecode to check for
    // finalizer registration so create a normal frame.
    return zerolocals;
  }

  // Empty method?
  if (m->is_empty_method()) {
    return empty;
  }

  // Special intrinsic method?
  // Note: This test must come _after_ the test for native methods,
  //       otherwise we will run into problems with JDK 1.2, see also
  //       AbstractInterpreterGenerator::generate_method_entry() for
  //       for details.
  switch (m->intrinsic_id()) {
    case vmIntrinsics::_dsin  : return java_lang_math_sin  ;
    case vmIntrinsics::_dcos  : return java_lang_math_cos  ;
    case vmIntrinsics::_dtan  : return java_lang_math_tan  ;
    case vmIntrinsics::_dabs  : return java_lang_math_abs  ;
    case vmIntrinsics::_dsqrt : return java_lang_math_sqrt ;
    case vmIntrinsics::_dlog  : return java_lang_math_log  ;
    case vmIntrinsics::_dlog10: return java_lang_math_log10;

    case vmIntrinsics::_Reference_get:
                                return java_lang_ref_reference_get;
  }

  // Accessor method?
  if (m->is_accessor()) {
    assert(m->size_of_parameters() == 1, "fast code for accessors assumes parameter size = 1");
    return accessor;
  }

  // Note: for now: zero locals for all non-empty methods
  return zerolocals;
}


// Return true if the interpreter can prove that the given bytecode has
// not yet been executed (in Java semantics, not in actual operation).
bool AbstractInterpreter::is_not_reached(methodHandle method, int bci) {
  Bytecodes::Code code = method()->code_at(bci);

  if (!Bytecodes::must_rewrite(code)) {
    // might have been reached
    return false;
  }

  // the bytecode might not be rewritten if the method is an accessor, etc.
  address ientry = method->interpreter_entry();
  if (ientry != entry_for_kind(AbstractInterpreter::zerolocals) &&
      ientry != entry_for_kind(AbstractInterpreter::zerolocals_synchronized))
    return false;  // interpreter does not run this method!

  // otherwise, we can be sure this bytecode has never been executed
  return true;
}


#ifndef PRODUCT
void AbstractInterpreter::print_method_kind(MethodKind kind) {
  switch (kind) {
    case zerolocals             : tty->print("zerolocals"             ); break;
    case zerolocals_synchronized: tty->print("zerolocals_synchronized"); break;
    case native                 : tty->print("native"                 ); break;
    case native_synchronized    : tty->print("native_synchronized"    ); break;
    case empty                  : tty->print("empty"                  ); break;
    case accessor               : tty->print("accessor"               ); break;
    case abstract               : tty->print("abstract"               ); break;
    case method_handle          : tty->print("method_handle"          ); break;
    case java_lang_math_sin     : tty->print("java_lang_math_sin"     ); break;
    case java_lang_math_cos     : tty->print("java_lang_math_cos"     ); break;
    case java_lang_math_tan     : tty->print("java_lang_math_tan"     ); break;
    case java_lang_math_abs     : tty->print("java_lang_math_abs"     ); break;
    case java_lang_math_sqrt    : tty->print("java_lang_math_sqrt"    ); break;
    case java_lang_math_log     : tty->print("java_lang_math_log"     ); break;
    case java_lang_math_log10   : tty->print("java_lang_math_log10"   ); break;
    default                     : ShouldNotReachHere();
  }
}
#endif // PRODUCT


//------------------------------------------------------------------------------------------------------------------------
// Deoptimization support

// If deoptimization happens, this function returns the point of next bytecode to continue execution
address AbstractInterpreter::deopt_continue_after_entry(methodOop method, address bcp, int callee_parameters, bool is_top_frame) {
  assert(method->contains(bcp), "just checkin'");
  Bytecodes::Code code   = Bytecodes::java_code_at(method, bcp);
  assert(!Interpreter::bytecode_should_reexecute(code), "should not reexecute");
  int             bci    = method->bci_from(bcp);
  int             length = -1; // initial value for debugging
  // compute continuation length
  length = Bytecodes::length_at(method, bcp);
  // compute result type
  BasicType type = T_ILLEGAL;

  switch (code) {
    case Bytecodes::_invokevirtual  :
    case Bytecodes::_invokespecial  :
    case Bytecodes::_invokestatic   :
    case Bytecodes::_invokeinterface: {
      Thread *thread = Thread::current();
      ResourceMark rm(thread);
      methodHandle mh(thread, method);
      type = Bytecode_invoke(mh, bci).result_type();
      // since the cache entry might not be initialized:
      // (NOT needed for the old calling convension)
      if (!is_top_frame) {
        int index = Bytes::get_native_u2(bcp+1);
        method->constants()->cache()->entry_at(index)->set_parameter_size(callee_parameters);
      }
      break;
    }

   case Bytecodes::_invokedynamic: {
      Thread *thread = Thread::current();
      ResourceMark rm(thread);
      methodHandle mh(thread, method);
      type = Bytecode_invoke(mh, bci).result_type();
      // since the cache entry might not be initialized:
      // (NOT needed for the old calling convension)
      if (!is_top_frame) {
        int index = Bytes::get_native_u4(bcp+1);
        method->constants()->cache()->secondary_entry_at(index)->set_parameter_size(callee_parameters);
      }
      break;
    }

    case Bytecodes::_ldc   :
    case Bytecodes::_ldc_w : // fall through
    case Bytecodes::_ldc2_w:
      {
        Thread *thread = Thread::current();
        ResourceMark rm(thread);
        methodHandle mh(thread, method);
        type = Bytecode_loadconstant(mh, bci).result_type();
        break;
      }

    default:
      type = Bytecodes::result_type(code);
      break;
  }

  // return entry point for computed continuation state & bytecode length
  return
    is_top_frame
    ? Interpreter::deopt_entry (as_TosState(type), length)
    : Interpreter::return_entry(as_TosState(type), length);
}

// If deoptimization happens, this function returns the point where the interpreter reexecutes
// the bytecode.
// Note: Bytecodes::_athrow is a special case in that it does not return
//       Interpreter::deopt_entry(vtos, 0) like others
address AbstractInterpreter::deopt_reexecute_entry(methodOop method, address bcp) {
  assert(method->contains(bcp), "just checkin'");
  Bytecodes::Code code   = Bytecodes::java_code_at(method, bcp);
#ifdef COMPILER1
  if(code == Bytecodes::_athrow ) {
    return Interpreter::rethrow_exception_entry();
  }
#endif /* COMPILER1 */
  return Interpreter::deopt_entry(vtos, 0);
}

// If deoptimization happens, the interpreter should reexecute these bytecodes.
// This function mainly helps the compilers to set up the reexecute bit.
bool AbstractInterpreter::bytecode_should_reexecute(Bytecodes::Code code) {
  switch (code) {
    case Bytecodes::_lookupswitch:
    case Bytecodes::_tableswitch:
    case Bytecodes::_fast_binaryswitch:
    case Bytecodes::_fast_linearswitch:
    // recompute condtional expression folded into _if<cond>
    case Bytecodes::_lcmp      :
    case Bytecodes::_fcmpl     :
    case Bytecodes::_fcmpg     :
    case Bytecodes::_dcmpl     :
    case Bytecodes::_dcmpg     :
    case Bytecodes::_ifnull    :
    case Bytecodes::_ifnonnull :
    case Bytecodes::_goto      :
    case Bytecodes::_goto_w    :
    case Bytecodes::_ifeq      :
    case Bytecodes::_ifne      :
    case Bytecodes::_iflt      :
    case Bytecodes::_ifge      :
    case Bytecodes::_ifgt      :
    case Bytecodes::_ifle      :
    case Bytecodes::_if_icmpeq :
    case Bytecodes::_if_icmpne :
    case Bytecodes::_if_icmplt :
    case Bytecodes::_if_icmpge :
    case Bytecodes::_if_icmpgt :
    case Bytecodes::_if_icmple :
    case Bytecodes::_if_acmpeq :
    case Bytecodes::_if_acmpne :
    // special cases
    case Bytecodes::_getfield  :
    case Bytecodes::_putfield  :
    case Bytecodes::_getstatic :
    case Bytecodes::_putstatic :
    case Bytecodes::_aastore   :
#ifdef COMPILER1
    //special case of reexecution
    case Bytecodes::_athrow    :
#endif
      return true;

    default:
      return false;
  }
}

void AbstractInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
  // Quick & dirty stack overflow checking: bang the stack & handle trap.
  // Note that we do the banging after the frame is setup, since the exception
  // handling code expects to find a valid interpreter frame on the stack.
  // Doing the banging earlier fails if the caller frame is not an interpreter
  // frame.
  // (Also, the exception throwing code expects to unlock any synchronized
  // method receiever, so do the banging after locking the receiver.)

  // Bang each page in the shadow zone. We can't assume it's been done for
  // an interpreter frame with greater than a page of locals, so each page
  // needs to be checked.  Only true for non-native.
  if (UseStackBanging) {
    const int start_page = native_call ? StackShadowPages : 1;
    const int page_size = os::vm_page_size();
    for (int pages = start_page; pages <= StackShadowPages ; pages++) {
      __ bang_stack_with_offset(pages*page_size);
    }
  }
}