| /* |
| * Copyright (c) 2009, 2012, 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. |
| */ |
| package org.graalvm.compiler.lir.sparc; |
| |
| import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; |
| import static jdk.vm.ci.code.ValueUtil.asRegister; |
| |
| import org.graalvm.compiler.asm.sparc.SPARCAssembler; |
| import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler; |
| import org.graalvm.compiler.lir.LIR; |
| import org.graalvm.compiler.lir.LIRInstructionClass; |
| import org.graalvm.compiler.lir.StandardOp.NoOp; |
| import org.graalvm.compiler.lir.Variable; |
| import org.graalvm.compiler.lir.asm.CompilationResultBuilder; |
| |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.meta.AllocatableValue; |
| |
| /** |
| * Loads the constant section base into a register. |
| * |
| * <p> |
| * Layout: |
| * |
| * <pre> |
| * +----constant section----+--pad--+---code section--+ |
| * |<-------------------_------------------->| |
| * ^- Constant section base pointer |
| * </pre> |
| * |
| * The constant section base pointer is placed as such that the lowest offset -4096 points to the |
| * start of the constant section. |
| * <p> |
| * If the constant section grows beyond 8k size, the immediate addressing cannot be used anymore; in |
| * this case absolute addressing (without using the base pointer is used). See also: |
| * CodeInstaller::pd_patch_DataSectionReference |
| * |
| * @see SPARCMove#loadFromConstantTable(CompilationResultBuilder, SPARCMacroAssembler, int, |
| * Register, jdk.vm.ci.meta.Constant, Register, SPARCDelayedControlTransfer) |
| */ |
| public class SPARCLoadConstantTableBaseOp extends SPARCLIRInstruction { |
| public static final LIRInstructionClass<SPARCLoadConstantTableBaseOp> TYPE = LIRInstructionClass.create(SPARCLoadConstantTableBaseOp.class); |
| public static final SizeEstimate SIZE = SizeEstimate.create(9); |
| |
| private final NoOp placeHolder; |
| @Def({REG}) private AllocatableValue base; |
| |
| public SPARCLoadConstantTableBaseOp(Variable base, NoOp placeHolder) { |
| super(TYPE, SIZE); |
| this.base = base; |
| this.placeHolder = placeHolder; |
| } |
| |
| @Override |
| public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) { |
| Register baseRegister = asRegister(base); |
| int beforePosition = masm.position(); |
| masm.rdpc(baseRegister); |
| // Must match with CodeInstaller::pd_patch_DataSectionReference |
| masm.add(baseRegister, (int) SPARCAssembler.minSimm(13), baseRegister); |
| masm.sub(baseRegister, beforePosition, baseRegister); |
| } |
| |
| public AllocatableValue getResult() { |
| return base; |
| } |
| |
| public void setAlive(LIR lir, boolean alive) { |
| if (alive) { |
| placeHolder.replace(lir, this); |
| } else { |
| placeHolder.remove(lir); |
| } |
| } |
| } |