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 /*

  * 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.

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  */

 #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"

 #ifdef COMPILER2

 #include "opto/matcher.hpp"

 #endif

 // 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;

   }

 }

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

 // A PPC CompiledStaticCall looks like this:

 //

 // >>>> consts

 //

 // [call target1]

 // [IC cache]

 // [call target2]

 //

 // <<<< consts

 // >>>> insts

 //

 // bl offset16               -+  -+             ??? // How many bits available?

 //                            |   |

 // <<<< insts                 |   |

 // >>>> stubs                 |   |

 //                            |   |- trampoline_stub_Reloc

 // trampoline stub:           | <-+

 //   r2 = toc                 |

 //   r2 = [r2 + offset]       |       // Load call target1 from const section

 //   mtctr r2                 |

 //   bctr                     |- static_stub_Reloc

 // comp_to_interp_stub:   <---+

 //   r1 = toc

 //   ICreg = [r1 + IC_offset]         // Load IC from const section

 //   r1    = [r1 + offset]            // Load call target2 from const section

 //   mtctr r1

 //   bctr

 //

 // <<<< stubs

 //

 // The call instruction in the code either

 // - branches directly to a compiled method if offset encodable in instruction

 // - branches to the trampoline stub if offset to compiled method not encodable

 // - branches to the compiled_to_interp stub if target interpreted

 //

 // Further there are three relocations from the loads to the constants in

 // the constant section.

 //

 // Usage of r1 and r2 in the stubs allows to distinguish them.

 const int IC_pos_in_java_to_interp_stub = 8;

 #define __ _masm.

 void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {

 #ifdef COMPILER2

   // Get the mark within main instrs section which is set to the address of the call.

   address call_addr = cbuf.insts_mark();

   // 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);

   // Start the stub.

   address stub = __ start_a_stub(CompiledStaticCall::to_interp_stub_size());

   if (stub == NULL) {

     Compile::current()->env()->record_out_of_memory_failure();

     return;

   }

   // For java_to_interp stubs we use R11_scratch1 as scratch register

   // and in call trampoline stubs we use R12_scratch2. This way we

   // can distinguish them (see is_NativeCallTrampolineStub_at()).

   Register reg_scratch = R11_scratch1;

   // Create a static stub relocation which relates this stub

   // with the call instruction at insts_call_instruction_offset in the

   // instructions code-section.

   __ relocate(static_stub_Relocation::spec(call_addr));

   const int stub_start_offset = __ offset();

   // Now, create the stub's code:

   // - load the TOC

   // - load the inline cache oop from the constant pool

   // - load the call target from the constant pool

   // - call

   __ calculate_address_from_global_toc(reg_scratch, __ method_toc());

   AddressLiteral ic = __ allocate_metadata_address((Metadata *)NULL);

   __ load_const_from_method_toc(as_Register(Matcher::inline_cache_reg_encode()), ic, reg_scratch);

   if (ReoptimizeCallSequences) {

     __ b64_patchable((address)-1, relocInfo::none);

   } else {

     AddressLiteral a((address)-1);

     __ load_const_from_method_toc(reg_scratch, a, reg_scratch);

     __ mtctr(reg_scratch);

     __ bctr();

   }

   // FIXME: Assert that the stub can be identified and patched.

   // Java_to_interp_stub_size should be good.

   assert((__ offset() - stub_start_offset) <= CompiledStaticCall::to_interp_stub_size(),

          "should be good size");

   assert(!is_NativeCallTrampolineStub_at(__ addr_at(stub_start_offset)),

          "must not confuse java_to_interp with trampoline stubs");

  // End the stub.

   __ end_a_stub();

 #else

   ShouldNotReachHere();

 #endif

 }

 #undef __

 // Size of java_to_interp stub, this doesn't need to be accurate but it must

 // be larger or equal to the real size of the stub.

 // Used for optimization in Compile::Shorten_branches.

 int CompiledStaticCall::to_interp_stub_size() {

   return 12 * BytesPerInstWord;

 }

 // Relocation entries for call stub, compiled java to interpreter.

 // Used for optimization in Compile::Shorten_branches.

 int CompiledStaticCall::reloc_to_interp_stub() {

   return 5;

 }

 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 + IC_pos_in_java_to_interp_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 + IC_pos_in_java_to_interp_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 + IC_pos_in_java_to_interp_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