1 /* 2 * Copyright (c) 2009, 2012, 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 package org.graalvm.compiler.lir.sparc; 24 25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG; 26 import static jdk.vm.ci.code.ValueUtil.asRegister; 27 28 import org.graalvm.compiler.asm.sparc.SPARCAssembler; 29 import org.graalvm.compiler.asm.sparc.SPARCMacroAssembler; 30 import org.graalvm.compiler.lir.LIR; 31 import org.graalvm.compiler.lir.LIRInstructionClass; 32 import org.graalvm.compiler.lir.StandardOp.NoOp; 33 import org.graalvm.compiler.lir.Variable; 34 import org.graalvm.compiler.lir.asm.CompilationResultBuilder; 35 36 import jdk.vm.ci.code.Register; 37 import jdk.vm.ci.meta.AllocatableValue; 38 39 /** 40 * Loads the constant section base into a register. 41 * 42 * <p> 43 * Layout: 44 * 45 * <pre> 46 * +----constant section----+--pad--+---code section--+ 47 * |<-------------------_------------------->| 48 * ^- Constant section base pointer 49 * </pre> 50 * 51 * The constant section base pointer is placed as such that the lowest offset -4096 points to the 52 * start of the constant section. 53 * <p> 54 * If the constant section grows beyond 8k size, the immediate addressing cannot be used anymore; in 55 * this case absolute addressing (without using the base pointer is used). See also: 56 * CodeInstaller::pd_patch_DataSectionReference 57 * 58 * @see SPARCMove#loadFromConstantTable(CompilationResultBuilder, SPARCMacroAssembler, Register, 59 * jdk.vm.ci.meta.Constant, Register, SPARCDelayedControlTransfer) 60 */ 61 public class SPARCLoadConstantTableBaseOp extends SPARCLIRInstruction { 62 public static final LIRInstructionClass<SPARCLoadConstantTableBaseOp> TYPE = LIRInstructionClass.create(SPARCLoadConstantTableBaseOp.class); 63 public static final SizeEstimate SIZE = SizeEstimate.create(9); 64 65 private final NoOp placeHolder; 66 @Def({REG}) private AllocatableValue base; 67 68 public SPARCLoadConstantTableBaseOp(Variable base, NoOp placeHolder) { 69 super(TYPE, SIZE); 70 this.base = base; 71 this.placeHolder = placeHolder; 72 } 73 74 @Override 75 public void emitCode(CompilationResultBuilder crb, SPARCMacroAssembler masm) { 76 Register baseRegister = asRegister(base); 77 int beforePosition = masm.position(); 78 masm.rdpc(baseRegister); 79 // Must match with CodeInstaller::pd_patch_DataSectionReference 80 masm.add(baseRegister, (int) SPARCAssembler.minSimm(13), baseRegister); 81 masm.sub(baseRegister, beforePosition, baseRegister); 82 } 83 84 public AllocatableValue getResult() { 85 return base; 86 } 87 88 public void setAlive(LIR lir, boolean alive) { 89 if (alive) { 90 placeHolder.replace(lir, this); 91 } else { 92 placeHolder.remove(lir); 93 } 94 } 95 }