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 /*

  * Copyright (c) 1997, 2014, 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",

                   p2i(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