1 /* 2 * Copyright (c) 2009, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.lir.sparc; 26 27 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; 28 import static jdk.vm.ci.code.ValueUtil.asRegister; 29 30 import org.graalvm.compiler.asm.sparc.SPARCAssembler; 31 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler; 32 import org.graalvm.compiler.lir.LIR; 33 import org.graalvm.compiler.lir.LIRInstructionClass; 34 import org.graalvm.compiler.lir.StandardOp.NoOp; 35 import org.graalvm.compiler.lir.Variable; 36 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 37 38 import jdk.vm.ci.code.Register; 39 import jdk.vm.ci.meta.AllocatableValue; 40 41 /** 42 * Loads the constant section base into a register. 43 * 44 * <p> 45 * Layout: 46 * 47 * <pre> 48 * +----constant section----+--pad--+---code section--+ 49 * |<-------------------_------------------->| 50 * ^- Constant section base pointer 51 * </pre> 52 * 53 * The constant section base pointer is placed as such that the lowest offset -4096 points to the 54 * start of the constant section. 55 * <p> 56 * If the constant section grows beyond 8k size, the immediate addressing cannot be used anymore; in 57 * this case absolute addressing (without using the base pointer is used). See also: 58 * CodeInstaller::pd_patch_DataSectionReference 59 * 60 * @see SPARCMove#loadFromConstantTable(CompilationResultBuilder, SPARCMacroAssembler, Register, 61 * jdk.vm.ci.meta.Constant, Register, SPARCDelayedControlTransfer) 62 */ 63 public class SPARCLoadConstantTableBaseOp extends SPARCLIRInstruction { 64 public static final LIRInstructionClass<SPARCLoadConstantTableBaseOp> TYPE = LIRInstructionClass.create(SPARCLoadConstantTableBaseOp.class); 65 public static final SizeEstimate SIZE = SizeEstimate.create(9); 66 67 private final NoOp placeHolder; 68 @Def({REG}) private AllocatableValue base; 69 70 public SPARCLoadConstantTableBaseOp(Variable base, NoOp placeHolder) { 71 super(TYPE, SIZE); 72 this.base = base; 73 this.placeHolder = placeHolder; 74 } 75 76 @Override 77 public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) { 78 Register baseRegister = asRegister(base); 79 int beforePosition = masm.position(); 80 masm.rdpc(baseRegister); 81 // Must match with CodeInstaller::pd_patch_DataSectionReference 82 masm.add(baseRegister, (int) SPARCAssembler.minSimm(13), baseRegister); 83 masm.sub(baseRegister, beforePosition, baseRegister); 84 } 85 86 public AllocatableValue getResult() { 87 return base; 88 } 89 90 public void setAlive(LIR lir, boolean alive) { 91 if (alive) { 92 placeHolder.replace(lir, this); 93 } else { 94 placeHolder.remove(lir); 95 } 96 } 97 }