Quelle compiledIC_riscv.cpp Sprache: C

/*
* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2018, Red Hat Inc. All rights reserved.
* Copyright (c) 2020, 2021, Huawei Technologies Co., Ltd. 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"

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

#define __ _masm.
address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf, address mark) {
  precond(cbuf.stubs()->start() != badAddress);
  precond(cbuf.stubs()->end() != badAddress);
  // Stub is fixed up when the corresponding call is converted from
  // calling compiled code to calling interpreted code.
  // mv xmethod, 0
  // jalr -4 # to self

  if (mark == NULL) {
    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());
  int offset = __ offset();
  if (base == NULL) {
    return NULL;  // CodeBuffer::expand failed
  }
  // static stub relocation stores the instruction address of the call
  __ relocate(static_stub_Relocation::spec(mark));

  __ emit_static_call_stub();

  assert((__ offset() - offset) <= (int)to_interp_stub_size(), "stub too big");
  __ end_a_stub();
  return base;
}
#undef __

int CompiledStaticCall::to_interp_stub_size() {
  // (lui, addi, slli, addi, slli, addi) + (lui, addi, slli, addi, slli) + jalr
  return 12 * NativeInstruction::instruction_size;
}

int CompiledStaticCall::to_trampoline_stub_size() {
  // Somewhat pessimistically, we count 4 instructions here (although
  // there are only 3) because we sometimes emit an alignment nop.
  // Trampoline stubs are always word aligned.
  return NativeInstruction::instruction_size + NativeCallTrampolineStub::instruction_size;
}

// 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 CompiledDirectStaticCall::set_to_interpreted(const methodHandle& callee, address entry) {
  address stub = find_stub();
  guarantee(stub != NULL, "stub not found");

  if (TraceICs) {
    ResourceMark rm;
    tty->print_cr("CompiledDirectStaticCall@" 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);
#ifdef ASSERT
  NativeGeneralJump* jump = nativeGeneralJump_at(method_holder->next_instruction_address());

  verify_mt_safe(callee, entry, method_holder, jump);
#endif
  // Update stub.
  method_holder->set_data((intptr_t)callee());
  NativeGeneralJump::insert_unconditional(method_holder->next_instruction_address(), entry);
  ICache::invalidate_range(stub, to_interp_stub_size());
  // Update jump to call.
  set_destination_mt_safe(stub);
}

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

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

void CompiledDirectStaticCall::verify() {
  // Verify call.
  _call->verify();
  _call->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

quality82%

¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.