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Java example source code file (sharkInliner.cpp)

This example Java source code file (sharkInliner.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytecodes\:\:_astore_0, bytecodes\:\:_astore_2, bytecodes\:\:_dmul, bytecodes\:\:_drem, bytecodes\:\:_fadd, bytecodes\:\:_getfield, new_resource_array, null, sharkblock, sharkconstant, sharkinlineblock, sharkinlinerhelper, sharkstate, sharkvalue

The sharkInliner.cpp Java example source code

/*
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2009 Red Hat, Inc.
 * 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 "ci/ciField.hpp"
#include "ci/ciMethod.hpp"
#include "ci/ciStreams.hpp"
#include "interpreter/bytecodes.hpp"
#include "memory/allocation.hpp"
#include "shark/sharkBlock.hpp"
#include "shark/sharkConstant.hpp"
#include "shark/sharkInliner.hpp"
#include "shark/sharkIntrinsics.hpp"
#include "shark/sharkState.hpp"
#include "shark/sharkValue.hpp"
#include "shark/shark_globals.hpp"

using namespace llvm;

class SharkInlineBlock : public SharkBlock {
 public:
  SharkInlineBlock(ciMethod* target, SharkState* state)
    : SharkBlock(state, target),
      _outer_state(state),
      _entry_state(new SharkState(this)) {
    for (int i = target->max_locals() - 1; i >= 0; i--) {
      SharkValue *value = NULL;
      if (i < target->arg_size())
        value = outer_state()->pop();
      entry_state()->set_local(i, value);
    }
  }

 private:
  SharkState* _outer_state;
  SharkState* _entry_state;

 private:
  SharkState* outer_state() {
    return _outer_state;
  }
  SharkState* entry_state() {
    return _entry_state;
  }

 public:
  void emit_IR() {
    parse_bytecode(0, target()->code_size());
  }

 private:
  void do_return(BasicType type) {
    if (type != T_VOID) {
      SharkValue *result = pop_result(type);
      outer_state()->push(result);
      if (result->is_two_word())
        outer_state()->push(NULL);
    }
  }
};

class SharkInlinerHelper : public StackObj {
 public:
  SharkInlinerHelper(ciMethod* target, SharkState* entry_state)
    : _target(target),
      _entry_state(entry_state),
      _iter(target) {}

 private:
  ciBytecodeStream _iter;
  SharkState*      _entry_state;
  ciMethod*        _target;

 public:
  ciBytecodeStream* iter() {
    return &_iter;
  }
  SharkState* entry_state() const {
    return _entry_state;
  }
  ciMethod* target() const {
    return _target;
  }

 public:
  Bytecodes::Code bc() {
    return iter()->cur_bc();
  }
  int max_locals() const {
    return target()->max_locals();
  }
  int max_stack() const {
    return target()->max_stack();
  }

  // Inlinability check
 public:
  bool is_inlinable();

 private:
  void initialize_for_check();

  bool do_getstatic() {
    return do_field_access(true, false);
  }
  bool do_getfield() {
    return do_field_access(true, true);
  }
  bool do_putfield() {
    return do_field_access(false, true);
  }
  bool do_field_access(bool is_get, bool is_field);

  // Local variables for inlinability check
 private:
  bool* _locals;

 public:
  bool* local_addr(int index) const {
    assert(index >= 0 && index < max_locals(), "bad local variable index");
    return &_locals[index];
  }
  bool local(int index) const {
    return *local_addr(index);
  }
  void set_local(int index, bool value) {
    *local_addr(index) = value;
  }

  // Expression stack for inlinability check
 private:
  bool* _stack;
  bool* _sp;

 public:
  int stack_depth() const {
    return _sp - _stack;
  }
  bool* stack_addr(int slot) const {
    assert(slot >= 0 && slot < stack_depth(), "bad stack slot");
    return &_sp[-(slot + 1)];
  }
  void push(bool value) {
    assert(stack_depth() < max_stack(), "stack overrun");
    *(_sp++) = value;
  }
  bool pop() {
    assert(stack_depth() > 0, "stack underrun");
    return *(--_sp);
  }

  // Methods for two-word locals
 public:
  void push_pair_local(int index) {
    push(local(index));
    push(local(index + 1));
  }
  void pop_pair_local(int index) {
    set_local(index + 1, pop());
    set_local(index, pop());
  }

  // Code generation
 public:
  void do_inline() {
    (new SharkInlineBlock(target(), entry_state()))->emit_IR();
  }
};

// Quick checks so we can bail out before doing too much
bool SharkInliner::may_be_inlinable(ciMethod *target) {
  // We can't inline native methods
  if (target->is_native())
    return false;

  // Not much point inlining abstract ones, and in any
  // case we'd need a stack frame to throw the exception
  if (target->is_abstract())
    return false;

  // Don't inline anything huge
  if (target->code_size() > SharkMaxInlineSize)
    return false;

  // Monitors aren't allowed without a frame to put them in
  if (target->is_synchronized() || target->has_monitor_bytecodes())
    return false;

  // We don't do control flow
  if (target->has_exception_handlers() || target->has_jsrs())
    return false;

  // Don't try to inline constructors, as they must
  // eventually call Object.<init> which we can't inline.
  // Note that this catches <clinit> too, but why would
  // we be compiling that?
  if (target->is_initializer())
    return false;

  // Mustn't inline Object.<init>
  // Should be caught by the above, but just in case...
  if (target->intrinsic_id() == vmIntrinsics::_Object_init)
    return false;

  return true;
}

// Full-on detailed check, for methods that pass the quick checks
// Inlined methods have no stack frame, so we can't do anything
// that would require one.  This means no safepoints (and hence
// no loops) and no VM calls.  No VM calls means, amongst other
// things, that no exceptions can be created, which means no null
// checks or divide-by-zero checks are allowed.  The lack of null
// checks in particular would eliminate practically everything,
// but we can get around that restriction by relying on the zero-
// check eliminator to strip the checks.  To do that, we need to
// walk through the method, tracking which values are and are not
// zero-checked.
bool SharkInlinerHelper::is_inlinable() {
  ResourceMark rm;
  initialize_for_check();

  SharkConstant *sc;
  bool a, b, c, d;

  iter()->reset_to_bci(0);
  while (iter()->next() != ciBytecodeStream::EOBC()) {
    switch (bc()) {
    case Bytecodes::_nop:
      break;

    case Bytecodes::_aconst_null:
      push(false);
      break;

    case Bytecodes::_iconst_0:
      push(false);
      break;
    case Bytecodes::_iconst_m1:
    case Bytecodes::_iconst_1:
    case Bytecodes::_iconst_2:
    case Bytecodes::_iconst_3:
    case Bytecodes::_iconst_4:
    case Bytecodes::_iconst_5:
      push(true);
      break;

    case Bytecodes::_lconst_0:
      push(false);
      push(false);
      break;
    case Bytecodes::_lconst_1:
      push(true);
      push(false);
      break;

    case Bytecodes::_fconst_0:
    case Bytecodes::_fconst_1:
    case Bytecodes::_fconst_2:
      push(false);
      break;

    case Bytecodes::_dconst_0:
    case Bytecodes::_dconst_1:
      push(false);
      push(false);
      break;

    case Bytecodes::_bipush:
      push(iter()->get_constant_u1() != 0);
      break;
    case Bytecodes::_sipush:
      push(iter()->get_constant_u2() != 0);
      break;

    case Bytecodes::_ldc:
    case Bytecodes::_ldc_w:
    case Bytecodes::_ldc2_w:
      sc = SharkConstant::for_ldc(iter());
      if (!sc->is_loaded())
        return false;
      push(sc->is_nonzero());
      if (sc->is_two_word())
        push(false);
      break;

    case Bytecodes::_iload_0:
    case Bytecodes::_fload_0:
    case Bytecodes::_aload_0:
      push(local(0));
      break;
    case Bytecodes::_lload_0:
    case Bytecodes::_dload_0:
      push_pair_local(0);
      break;

    case Bytecodes::_iload_1:
    case Bytecodes::_fload_1:
    case Bytecodes::_aload_1:
      push(local(1));
      break;
    case Bytecodes::_lload_1:
    case Bytecodes::_dload_1:
      push_pair_local(1);
      break;

    case Bytecodes::_iload_2:
    case Bytecodes::_fload_2:
    case Bytecodes::_aload_2:
      push(local(2));
      break;
    case Bytecodes::_lload_2:
    case Bytecodes::_dload_2:
      push_pair_local(2);
      break;

    case Bytecodes::_iload_3:
    case Bytecodes::_fload_3:
    case Bytecodes::_aload_3:
      push(local(3));
      break;
    case Bytecodes::_lload_3:
    case Bytecodes::_dload_3:
      push_pair_local(3);
      break;

    case Bytecodes::_iload:
    case Bytecodes::_fload:
    case Bytecodes::_aload:
      push(local(iter()->get_index()));
      break;
    case Bytecodes::_lload:
    case Bytecodes::_dload:
      push_pair_local(iter()->get_index());
      break;

    case Bytecodes::_istore_0:
    case Bytecodes::_fstore_0:
    case Bytecodes::_astore_0:
      set_local(0, pop());
      break;
    case Bytecodes::_lstore_0:
    case Bytecodes::_dstore_0:
      pop_pair_local(0);
      break;

    case Bytecodes::_istore_1:
    case Bytecodes::_fstore_1:
    case Bytecodes::_astore_1:
      set_local(1, pop());
      break;
    case Bytecodes::_lstore_1:
    case Bytecodes::_dstore_1:
      pop_pair_local(1);
      break;

    case Bytecodes::_istore_2:
    case Bytecodes::_fstore_2:
    case Bytecodes::_astore_2:
      set_local(2, pop());
      break;
    case Bytecodes::_lstore_2:
    case Bytecodes::_dstore_2:
      pop_pair_local(2);
      break;

    case Bytecodes::_istore_3:
    case Bytecodes::_fstore_3:
    case Bytecodes::_astore_3:
      set_local(3, pop());
      break;
    case Bytecodes::_lstore_3:
    case Bytecodes::_dstore_3:
      pop_pair_local(3);
      break;

    case Bytecodes::_istore:
    case Bytecodes::_fstore:
    case Bytecodes::_astore:
      set_local(iter()->get_index(), pop());
      break;
    case Bytecodes::_lstore:
    case Bytecodes::_dstore:
      pop_pair_local(iter()->get_index());
      break;

    case Bytecodes::_pop:
      pop();
      break;
    case Bytecodes::_pop2:
      pop();
      pop();
      break;
    case Bytecodes::_swap:
      a = pop();
      b = pop();
      push(a);
      push(b);
      break;
    case Bytecodes::_dup:
      a = pop();
      push(a);
      push(a);
      break;
    case Bytecodes::_dup_x1:
      a = pop();
      b = pop();
      push(a);
      push(b);
      push(a);
      break;
    case Bytecodes::_dup_x2:
      a = pop();
      b = pop();
      c = pop();
      push(a);
      push(c);
      push(b);
      push(a);
      break;
    case Bytecodes::_dup2:
      a = pop();
      b = pop();
      push(b);
      push(a);
      push(b);
      push(a);
      break;
    case Bytecodes::_dup2_x1:
      a = pop();
      b = pop();
      c = pop();
      push(b);
      push(a);
      push(c);
      push(b);
      push(a);
      break;
    case Bytecodes::_dup2_x2:
      a = pop();
      b = pop();
      c = pop();
      d = pop();
      push(b);
      push(a);
      push(d);
      push(c);
      push(b);
      push(a);
      break;

    case Bytecodes::_getfield:
      if (!do_getfield())
        return false;
      break;
    case Bytecodes::_getstatic:
      if (!do_getstatic())
        return false;
      break;
    case Bytecodes::_putfield:
      if (!do_putfield())
        return false;
      break;

    case Bytecodes::_iadd:
    case Bytecodes::_isub:
    case Bytecodes::_imul:
    case Bytecodes::_iand:
    case Bytecodes::_ixor:
    case Bytecodes::_ishl:
    case Bytecodes::_ishr:
    case Bytecodes::_iushr:
      pop();
      pop();
      push(false);
      break;
    case Bytecodes::_ior:
      a = pop();
      b = pop();
      push(a && b);
      break;
    case Bytecodes::_idiv:
    case Bytecodes::_irem:
      if (!pop())
        return false;
      pop();
      push(false);
      break;
    case Bytecodes::_ineg:
      break;

    case Bytecodes::_ladd:
    case Bytecodes::_lsub:
    case Bytecodes::_lmul:
    case Bytecodes::_land:
    case Bytecodes::_lxor:
      pop();
      pop();
      pop();
      pop();
      push(false);
      push(false);
      break;
    case Bytecodes::_lor:
      a = pop();
      b = pop();
      push(a && b);
      break;
    case Bytecodes::_ldiv:
    case Bytecodes::_lrem:
      pop();
      if (!pop())
        return false;
      pop();
      pop();
      push(false);
      push(false);
      break;
    case Bytecodes::_lneg:
      break;
    case Bytecodes::_lshl:
    case Bytecodes::_lshr:
    case Bytecodes::_lushr:
      pop();
      pop();
      pop();
      push(false);
      push(false);
      break;

    case Bytecodes::_fadd:
    case Bytecodes::_fsub:
    case Bytecodes::_fmul:
    case Bytecodes::_fdiv:
    case Bytecodes::_frem:
      pop();
      pop();
      push(false);
      break;
    case Bytecodes::_fneg:
      break;

    case Bytecodes::_dadd:
    case Bytecodes::_dsub:
    case Bytecodes::_dmul:
    case Bytecodes::_ddiv:
    case Bytecodes::_drem:
      pop();
      pop();
      pop();
      pop();
      push(false);
      push(false);
      break;
    case Bytecodes::_dneg:
      break;

    case Bytecodes::_iinc:
      set_local(iter()->get_index(), false);
      break;

    case Bytecodes::_lcmp:
      pop();
      pop();
      pop();
      pop();
      push(false);
      break;

    case Bytecodes::_fcmpl:
    case Bytecodes::_fcmpg:
      pop();
      pop();
      push(false);
      break;

    case Bytecodes::_dcmpl:
    case Bytecodes::_dcmpg:
      pop();
      pop();
      pop();
      pop();
      push(false);
      break;

    case Bytecodes::_i2l:
      push(false);
      break;
    case Bytecodes::_i2f:
      pop();
      push(false);
      break;
    case Bytecodes::_i2d:
      pop();
      push(false);
      push(false);
      break;

    case Bytecodes::_l2i:
    case Bytecodes::_l2f:
      pop();
      pop();
      push(false);
      break;
    case Bytecodes::_l2d:
      pop();
      pop();
      push(false);
      push(false);
      break;

    case Bytecodes::_f2i:
      pop();
      push(false);
      break;
    case Bytecodes::_f2l:
    case Bytecodes::_f2d:
      pop();
      push(false);
      push(false);
      break;

    case Bytecodes::_d2i:
    case Bytecodes::_d2f:
      pop();
      pop();
      push(false);
      break;
    case Bytecodes::_d2l:
      pop();
      pop();
      push(false);
      push(false);
      break;

    case Bytecodes::_i2b:
    case Bytecodes::_i2c:
    case Bytecodes::_i2s:
      pop();
      push(false);
      break;

    case Bytecodes::_return:
    case Bytecodes::_ireturn:
    case Bytecodes::_lreturn:
    case Bytecodes::_freturn:
    case Bytecodes::_dreturn:
    case Bytecodes::_areturn:
      break;

    default:
      return false;
    }
  }

  return true;
}

void SharkInlinerHelper::initialize_for_check() {
  _locals = NEW_RESOURCE_ARRAY(bool, max_locals());
  _stack = NEW_RESOURCE_ARRAY(bool, max_stack());

  memset(_locals, 0, max_locals() * sizeof(bool));
  for (int i = 0; i < target()->arg_size(); i++) {
    SharkValue *arg = entry_state()->stack(target()->arg_size() - 1 - i);
    if (arg && arg->zero_checked())
      set_local(i, true);
  }

  _sp = _stack;
}

bool SharkInlinerHelper::do_field_access(bool is_get, bool is_field) {
  assert(is_get || is_field, "can't inline putstatic");

  // If the holder isn't linked then there isn't a lot we can do
  if (!target()->holder()->is_linked())
    return false;

  // Get the field
  bool will_link;
  ciField *field = iter()->get_field(will_link);
  if (!will_link)
    return false;

  // If the field is mismatched then an exception needs throwing
  if (is_field == field->is_static())
    return false;

  // Pop the value off the stack if necessary
  if (!is_get) {
    pop();
    if (field->type()->is_two_word())
      pop();
  }

  // Pop and null-check the receiver if necessary
  if (is_field) {
    if (!pop())
      return false;
  }

  // Push the result if necessary
  if (is_get) {
    bool result_pushed = false;
    if (field->is_constant() && field->is_static()) {
      SharkConstant *sc = SharkConstant::for_field(iter());
      if (sc->is_loaded()) {
        push(sc->is_nonzero());
        result_pushed = true;
      }
    }

    if (!result_pushed)
      push(false);

    if (field->type()->is_two_word())
      push(false);
  }

  return true;
}

bool SharkInliner::attempt_inline(ciMethod *target, SharkState *state) {
  if (SharkIntrinsics::is_intrinsic(target)) {
    SharkIntrinsics::inline_intrinsic(target, state);
    return true;
  }

  if (may_be_inlinable(target)) {
    SharkInlinerHelper inliner(target, state);
    if (inliner.is_inlinable()) {
      inliner.do_inline();
      return true;
    }
  }
  return false;
}

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