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Java example source code file (compiledIC_x86.cpp)

This example Java source code file (compiledIC_x86.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

assembler\:\:imm_operand, compiledic\:\:compiledic, compiledstaticcall\:\:emit_to_interp_stub, compiledstaticcall\:\:to_interp_stub_size, compiledstaticcall\:\:verify, intptr_format, lp64_only, method, mt\-unsafe, nativecall, nativejump, nativemovconstreg, null, product

The compiledIC_x86.cpp Java example source code

/*
 * Copyright (c) 1997, 2013, 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/macroAssembler.inline.hpp"
#include "code/compiledIC.hpp"
#include "code/icBuffer.hpp"
#include "code/nmethod.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/safepoint.hpp"

// Release the CompiledICHolder* associated with this call site is there is one.
void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
  // This call site might have become stale so inspect it carefully.
  NativeCall* call = nativeCall_at(call_site->addr());
  if (is_icholder_entry(call->destination())) {
    NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
    InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
  }
}

bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
  // This call site might have become stale so inspect it carefully.
  NativeCall* call = nativeCall_at(call_site->addr());
  return is_icholder_entry(call->destination());
}

//-----------------------------------------------------------------------------
// High-level access to an inline cache. Guaranteed to be MT-safe.

CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
  : _ic_call(call)
{
  address ic_call = call->instruction_address();

  assert(ic_call != NULL, "ic_call address must be set");
  assert(nm != NULL, "must pass nmethod");
  assert(nm->contains(ic_call), "must be in nmethod");

  // Search for the ic_call at the given address.
  RelocIterator iter(nm, ic_call, ic_call+1);
  bool ret = iter.next();
  assert(ret == true, "relocInfo must exist at this address");
  assert(iter.addr() == ic_call, "must find ic_call");
  if (iter.type() == relocInfo::virtual_call_type) {
    virtual_call_Relocation* r = iter.virtual_call_reloc();
    _is_optimized = false;
    _value = nativeMovConstReg_at(r->cached_value());
  } else {
    assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
    _is_optimized = true;
    _value = NULL;
  }
}

// ----------------------------------------------------------------------------

#define __ _masm.
void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
  // Stub is fixed up when the corresponding call is converted from
  // calling compiled code to calling interpreted code.
  // movq rbx, 0
  // jmp -5 # to self

  address mark = cbuf.insts_mark();  // Get mark within main instrs section.

  // Note that the code buffer's insts_mark is always relative to insts.
  // That's why we must use the macroassembler to generate a stub.
  MacroAssembler _masm(&cbuf);

  address base =
  __ start_a_stub(to_interp_stub_size()*2);
  if (base == NULL) return;  // CodeBuffer::expand failed.
  // Static stub relocation stores the instruction address of the call.
  __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
  // Static stub relocation also tags the Method* in the code-stream.
  __ mov_metadata(rbx, (Metadata*) NULL);  // Method is zapped till fixup time.
  // This is recognized as unresolved by relocs/nativeinst/ic code.
  __ jump(RuntimeAddress(__ pc()));

  // Update current stubs pointer and restore insts_end.
  __ end_a_stub();
}
#undef __

int CompiledStaticCall::to_interp_stub_size() {
  return NOT_LP64(10)    // movl; jmp
         LP64_ONLY(15);  // movq (1+1+8); jmp (1+4)
}

// Relocation entries for call stub, compiled java to interpreter.
int CompiledStaticCall::reloc_to_interp_stub() {
  return 4; // 3 in emit_to_interp_stub + 1 in emit_call
}

void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
  address stub = find_stub();
  guarantee(stub != NULL, "stub not found");

  if (TraceICs) {
    ResourceMark rm;
    tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
                  instruction_address(),
                  callee->name_and_sig_as_C_string());
  }

  // Creation also verifies the object.
  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
  NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());

  assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
         "a) MT-unsafe modification of inline cache");
  assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
         "b) MT-unsafe modification of inline cache");

  // Update stub.
  method_holder->set_data((intptr_t)callee());
  jump->set_jump_destination(entry);

  // Update jump to call.
  set_destination_mt_safe(stub);
}

void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
  assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
  // Reset stub.
  address stub = static_stub->addr();
  assert(stub != NULL, "stub not found");
  // Creation also verifies the object.
  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
  NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());
  method_holder->set_data(0);
  jump->set_jump_destination((address)-1);
}

//-----------------------------------------------------------------------------
// Non-product mode code
#ifndef PRODUCT

void CompiledStaticCall::verify() {
  // Verify call.
  NativeCall::verify();
  if (os::is_MP()) {
    verify_alignment();
  }

  // Verify stub.
  address stub = find_stub();
  assert(stub != NULL, "no stub found for static call");
  // Creation also verifies the object.
  NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
  NativeJump*        jump          = nativeJump_at(method_holder->next_instruction_address());

  // Verify state.
  assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
}

#endif // !PRODUCT

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