view src/share/vm/interpreter/abstractInterpreter.hpp @ 2346: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 8033953d67ff
children 3d2ab563047a
line wrap: on
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 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * 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 if you need additional information or have any
 * questions.


#include "code/stubs.hpp"
#include "interpreter/bytecodes.hpp"
#include "runtime/vmThread.hpp"
#include "utilities/top.hpp"
#ifdef TARGET_ARCH_MODEL_x86_32
# include "interp_masm_x86_32.hpp"
#ifdef TARGET_ARCH_MODEL_x86_64
# include "interp_masm_x86_64.hpp"
#ifdef TARGET_ARCH_MODEL_sparc
# include "interp_masm_sparc.hpp"
# include "interp_masm_zero.hpp"
# include "interp_masm_arm.hpp"
# include "interp_masm_ppc.hpp"
#ifdef TARGET_OS_FAMILY_linux
# include "thread_linux.inline.hpp"
#ifdef TARGET_OS_FAMILY_solaris
# include "thread_solaris.inline.hpp"
#ifdef TARGET_OS_FAMILY_windows
# include "thread_windows.inline.hpp"

// This file contains the platform-independent parts
// of the abstract interpreter and the abstract interpreter generator.

// Organization of the interpreter(s). There exists two different interpreters in hotpot
// an assembly language version (aka template interpreter) and a high level language version
// (aka c++ interpreter). Th division of labor is as follows:

// Template Interpreter          C++ Interpreter        Functionality
// templateTable*                bytecodeInterpreter*   actual interpretation of bytecodes
// templateInterpreter*          cppInterpreter*        generation of assembly code that creates
//                                                      and manages interpreter runtime frames.
//                                                      Also code for populating interpreter
//                                                      frames created during deoptimization.
// For both template and c++ interpreter. There are common files for aspects of the interpreter
// that are generic to both interpreters. This is the layout:
// abstractInterpreter.hpp: generic description of the interpreter.
// interpreter*:            generic frame creation and handling.

// The C++ interface to the bytecode interpreter(s).

class AbstractInterpreter: AllStatic {
  friend class VMStructs;
  friend class Interpreter;
  friend class CppInterpreterGenerator;
  enum MethodKind {
    zerolocals,                                                 // method needs locals initialization
    zerolocals_synchronized,                                    // method needs locals initialization & is synchronized
    native,                                                     // native method
    native_synchronized,                                        // native method & is synchronized
    empty,                                                      // empty method (code: _return)
    accessor,                                                   // accessor method (code: _aload_0, _getfield, _(a|i)return)
    abstract,                                                   // abstract method (throws an AbstractMethodException)
    method_handle,                                              // java.lang.invoke.MethodHandles::invoke
    java_lang_math_sin,                                         // implementation of java.lang.Math.sin   (x)
    java_lang_math_cos,                                         // implementation of java.lang.Math.cos   (x)
    java_lang_math_tan,                                         // implementation of java.lang.Math.tan   (x)
    java_lang_math_abs,                                         // implementation of java.lang.Math.abs   (x)
    java_lang_math_sqrt,                                        // implementation of java.lang.Math.sqrt  (x)
    java_lang_math_log,                                         // implementation of java.lang.Math.log   (x)
    java_lang_math_log10,                                       // implementation of java.lang.Math.log10 (x)
    java_lang_ref_reference_get,                                // implementation of java.lang.ref.Reference.get()
    invalid = -1

  enum SomeConstants {
    number_of_result_handlers = 10                              // number of result handlers for native calls

  static StubQueue* _code;                                      // the interpreter code (codelets)

  static bool       _notice_safepoints;                         // true if safepoints are activated

  static address    _native_entry_begin;                        // Region for native entry code
  static address    _native_entry_end;

  // method entry points
  static address    _entry_table[number_of_method_entries];     // entry points for a given method
  static address    _native_abi_to_tosca[number_of_result_handlers];  // for native method result handlers
  static address    _slow_signature_handler;                              // the native method generic (slow) signature handler

  static address    _rethrow_exception_entry;                   // rethrows an activation in previous frame

  friend class      AbstractInterpreterGenerator;
  friend class              InterpreterGenerator;
  friend class      InterpreterMacroAssembler;

  // Initialization/debugging
  static void       initialize();
  static StubQueue* code()                                      { return _code; }

  // Method activation
  static MethodKind method_kind(methodHandle m);
  static address    entry_for_kind(MethodKind k)                { assert(0 <= k && k < number_of_method_entries, "illegal kind"); return _entry_table[k]; }
  static address    entry_for_method(methodHandle m)            { return entry_for_kind(method_kind(m)); }

  static void       print_method_kind(MethodKind kind)          PRODUCT_RETURN;

  static bool       can_be_compiled(methodHandle m);

  // Runtime support

  // length = invoke bytecode length (to advance to next bytecode)
  static address    deopt_entry   (TosState state, int length) { ShouldNotReachHere(); return NULL; }
  static address    return_entry  (TosState state, int length) { ShouldNotReachHere(); return NULL; }

  static address    rethrow_exception_entry()                   { return _rethrow_exception_entry; }

  // Activation size in words for a method that is just being called.
  // Parameters haven't been pushed so count them too.
  static int        size_top_interpreter_activation(methodOop method);

  // Deoptimization support
  // Compute the entry address for continuation after
  static address deopt_continue_after_entry(methodOop method,
                                            address bcp,
                                            int callee_parameters,
                                            bool is_top_frame);
  // Compute the entry address for reexecution
  static address deopt_reexecute_entry(methodOop method, address bcp);
  // Deoptimization should reexecute this bytecode
  static bool    bytecode_should_reexecute(Bytecodes::Code code);

  // share implementation of size_activation and layout_activation:
  static int        size_activation(methodOop method,
                                    int temps,
                                    int popframe_args,
                                    int monitors,
                                    int callee_params,
                                    int callee_locals,
                                    bool is_top_frame);

  static int       layout_activation(methodOop method,
                                      int temps,
                                      int popframe_args,
                                      int monitors,
                                      int callee_params,
                                      int callee_locals,
                                      frame* caller,
                                      frame* interpreter_frame,
                                      bool is_top_frame);

  // Runtime support
  static bool       is_not_reached(                       methodHandle method, int bci);
  // Safepoint support
  static void       notice_safepoints()                         { ShouldNotReachHere(); } // stops the thread when reaching a safepoint
  static void       ignore_safepoints()                         { ShouldNotReachHere(); } // ignores safepoints

  // Support for native calls
  static address    slow_signature_handler()                    { return _slow_signature_handler; }
  static address    result_handler(BasicType type)              { return _native_abi_to_tosca[BasicType_as_index(type)]; }
  static int        BasicType_as_index(BasicType type);         // computes index into result_handler_by_index table
  static bool       in_native_entry(address pc)                 { return _native_entry_begin <= pc && pc < _native_entry_end; }
  // Debugging/printing
  static void       print();                                    // prints the interpreter code

  // Interpreter helpers
  const static int stackElementWords   = 1;
  const static int stackElementSize    = stackElementWords * wordSize;
  const static int logStackElementSize = LogBytesPerWord;

  // Local values relative to locals[n]
  static int  local_offset_in_bytes(int n) {
    return ((frame::interpreter_frame_expression_stack_direction() * n) * stackElementSize);

  // access to stacked values according to type:
  static oop* oop_addr_in_slot(intptr_t* slot_addr) {
    return (oop*) slot_addr;
  static jint* int_addr_in_slot(intptr_t* slot_addr) {
    if ((int) sizeof(jint) < wordSize && !Bytes::is_Java_byte_ordering_different())
      // big-endian LP64
      return (jint*)(slot_addr + 1) - 1;
      return (jint*) slot_addr;
  static jlong long_in_slot(intptr_t* slot_addr) {
    if (sizeof(intptr_t) >= sizeof(jlong)) {
      return *(jlong*) slot_addr;
    } else {
      return Bytes::get_native_u8((address)slot_addr);
  static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
    if (sizeof(intptr_t) >= sizeof(jlong)) {
      *(jlong*) slot_addr = value;
    } else {
      Bytes::put_native_u8((address)slot_addr, value);
  static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
    switch (type) {
    case T_BOOLEAN: value->z = *int_addr_in_slot(slot_addr);            break;
    case T_CHAR:    value->c = *int_addr_in_slot(slot_addr);            break;
    case T_BYTE:    value->b = *int_addr_in_slot(slot_addr);            break;
    case T_SHORT:   value->s = *int_addr_in_slot(slot_addr);            break;
    case T_INT:     value->i = *int_addr_in_slot(slot_addr);            break;
    case T_LONG:    value->j = long_in_slot(slot_addr);                 break;
    case T_FLOAT:   value->f = *(jfloat*)int_addr_in_slot(slot_addr);   break;
    case T_DOUBLE:  value->d = jdouble_cast(long_in_slot(slot_addr));   break;
    case T_OBJECT:  value->l = (jobject)*oop_addr_in_slot(slot_addr);   break;
    default:        ShouldNotReachHere();
  static void set_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
    switch (type) {
    case T_BOOLEAN: *int_addr_in_slot(slot_addr) = (value->z != 0);     break;
    case T_CHAR:    *int_addr_in_slot(slot_addr) = value->c;            break;
    case T_BYTE:    *int_addr_in_slot(slot_addr) = value->b;            break;
    case T_SHORT:   *int_addr_in_slot(slot_addr) = value->s;            break;
    case T_INT:     *int_addr_in_slot(slot_addr) = value->i;            break;
    case T_LONG:    set_long_in_slot(slot_addr, value->j);              break;
    case T_FLOAT:   *(jfloat*)int_addr_in_slot(slot_addr) = value->f;   break;
    case T_DOUBLE:  set_long_in_slot(slot_addr, jlong_cast(value->d));  break;
    case T_OBJECT:  *oop_addr_in_slot(slot_addr) = (oop) value->l;      break;
    default:        ShouldNotReachHere();

// The interpreter generator.

class Template;
class AbstractInterpreterGenerator: public StackObj {
  InterpreterMacroAssembler* _masm;

  // shared code sequences
  // Converter for native abi result to tosca result
  address generate_result_handler_for(BasicType type);
  address generate_slow_signature_handler();

  // entry point generator
  address generate_method_entry(AbstractInterpreter::MethodKind kind);

  void bang_stack_shadow_pages(bool native_call);

  void generate_all();

  AbstractInterpreterGenerator(StubQueue* _code);