jdk

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/*
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 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2014, 2018, Red Hat Inc. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "code/compiledIC.hpp"
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#include "code/nmethod.hpp"
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#include "logging/log.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/safepoint.hpp"
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// ----------------------------------------------------------------------------
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#define __ masm->
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address CompiledDirectCall::emit_to_interp_stub(MacroAssembler *masm, address mark) {
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  precond(__ code()->stubs()->start() != badAddress);
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  precond(__ code()->stubs()->end() != badAddress);
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  // Stub is fixed up when the corresponding call is converted from
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  // calling compiled code to calling interpreted code.
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  // mov rmethod, 0
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  // jmp -4 # to self
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  if (mark == nullptr) {
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    mark = __ inst_mark();  // Get mark within main instrs section.
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  }
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  address base = __ start_a_stub(to_interp_stub_size());
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  int offset = __ offset();
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  if (base == nullptr) {
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    return nullptr;  // CodeBuffer::expand failed
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  }
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  // static stub relocation stores the instruction address of the call
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  __ relocate(static_stub_Relocation::spec(mark));
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  {
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    __ emit_static_call_stub();
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  }
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  assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");
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  __ end_a_stub();
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  return base;
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}
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#undef __
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int CompiledDirectCall::to_interp_stub_size() {
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  return MacroAssembler::static_call_stub_size();
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}
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int CompiledDirectCall::to_trampoline_stub_size() {
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  // Somewhat pessimistically, we count 3 instructions here (although
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  // there are only two) because we sometimes emit an alignment nop.
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  // Trampoline stubs are always word aligned.
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  return MacroAssembler::max_trampoline_stub_size();
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}
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// Relocation entries for call stub, compiled java to interpreter.
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int CompiledDirectCall::reloc_to_interp_stub() {
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  return 4; // 3 in emit_to_interp_stub + 1 in emit_call
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}
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void CompiledDirectCall::set_to_interpreted(const methodHandle& callee, address entry) {
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  address stub = find_stub();
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  guarantee(stub != nullptr, "stub not found");
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder
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    = nativeMovConstReg_at(stub + NativeInstruction::instruction_size);
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#ifdef ASSERT
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  NativeGeneralJump* jump = nativeGeneralJump_at(method_holder->next_instruction_address());
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  verify_mt_safe(callee, entry, method_holder, jump);
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#endif
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  // Update stub.
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  method_holder->set_data((intptr_t)callee());
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  NativeGeneralJump::insert_unconditional(method_holder->next_instruction_address(), entry);
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  ICache::invalidate_range(stub, to_interp_stub_size());
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  // Update jump to call.
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  set_destination_mt_safe(stub);
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}
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void CompiledDirectCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
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  // Reset stub.
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  address stub = static_stub->addr();
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  assert(stub != nullptr, "stub not found");
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  assert(CompiledICLocker::is_safe(stub), "mt unsafe call");
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder
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    = nativeMovConstReg_at(stub + NativeInstruction::instruction_size);
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  method_holder->set_data(0);
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  NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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  jump->set_jump_destination((address)-1);
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}
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//-----------------------------------------------------------------------------
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// Non-product mode code
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#ifndef PRODUCT
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void CompiledDirectCall::verify() {
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  // Verify call.
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  _call->verify();
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  _call->verify_alignment();
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  // Verify stub.
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  address stub = find_stub();
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  assert(stub != nullptr, "no stub found for static call");
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  // Creation also verifies the object.
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  NativeMovConstReg* method_holder
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    = nativeMovConstReg_at(stub + NativeInstruction::instruction_size);
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  NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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  // Verify state.
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  assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
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}
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#endif // !PRODUCT
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