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annotate graal/com.oracle.graal.lir/src/com/oracle/graal/lir/StandardOp.java @ 7353:b5280041f59e

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Experiment with soft alignment for branch targets.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 13 Jan 2013 19:32:16 +0100
parents edb4951bc8b5
children 4c6e577d0c01
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1 /*
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.lir;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.asm.*;
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27 import com.oracle.graal.lir.asm.*;
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28 import static com.oracle.graal.lir.LIRInstruction.OperandFlag.*;
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29
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30 /**
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31 * A collection of machine-independent LIR operations, as well as interfaces to be implemented for specific kinds or LIR
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32 * operations.
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33 */
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34 public class StandardOp {
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35
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36 private static Value[] EMPTY = new Value[0];
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37
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38 /**
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39 * Marker interface for LIR ops that can fall through to the next operation, like a switch statement.
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40 * setFallThroughTarget(null) can be used to make the operation fall through to the next one.
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41 */
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42 public interface FallThroughOp {
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43 LabelRef fallThroughTarget();
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44 void setFallThroughTarget(LabelRef target);
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45 }
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46
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47 /**
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48 * LIR operation that defines the position of a label.
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49 * The first operation of every block must implement this interface.
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50 */
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51 public static class LabelOp extends LIRInstruction {
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52 private final Label label;
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53 private final boolean align;
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54 private final boolean softAlign;
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55
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56 public LabelOp(Label label, boolean align, boolean softAlign) {
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57 this.label = label;
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58 this.align = align;
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59 this.softAlign = softAlign;
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60 }
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61
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62 @Override
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63 public void emitCode(TargetMethodAssembler tasm) {
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64 if (align) {
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65 tasm.asm.align(tasm.target.wordSize * 2);
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66 }
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67 if (softAlign) {
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68 tasm.asm.softAlign(tasm.target.wordSize * 2);
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69 }
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70 tasm.asm.bind(label);
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71 }
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72
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73 public Label getLabel() {
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74 return label;
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75 }
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76 }
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77
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78 /**
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79 * LIR operation that is an unconditional jump to {@link #destination()}.
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80 * When the LIR is constructed, the last operation of every block must implement this interface. After
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81 * register allocation, unnecessary jumps can be deleted.
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82 *
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83 * TODO (cwimmer) Currently, a block can also end with an XIR operation.
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84 */
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85 public static class JumpOp extends LIRInstruction {
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86 private final LabelRef destination;
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87 @State protected LIRFrameState state;
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88
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89 public JumpOp(LabelRef destination, LIRFrameState state) {
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90 this.destination = destination;
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91 this.state = state;
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92 }
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93
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94 @Override
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95 public void emitCode(TargetMethodAssembler tasm) {
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96 tasm.asm.jmp(destination.label());
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97 }
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98
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99 public LabelRef destination() {
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100 return destination;
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101 }
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102 }
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103
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104 public static class PhiJumpOp extends JumpOp {
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105 @Alive({REG, STACK, CONST}) protected Value[] phiInputs;
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106
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107 public PhiJumpOp(LabelRef destination, Value[] phiInputs) {
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108 super(destination, null);
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109 this.phiInputs = phiInputs;
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110 }
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111
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112 public void markResolved() {
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113 phiInputs = EMPTY;
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114 }
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115
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116 public Value[] getPhiInputs() {
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117 return phiInputs;
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118 }
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119 }
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120
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121 /**
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122 * Marker interface for a LIR operation that is a conditional jump to {@link #destination()}.
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123 * Conditional jumps may be negated or optimized away after register allocation.
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124 */
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125 public interface BranchOp {
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126 LabelRef destination();
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127 void negate(LabelRef newDestination);
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128 }
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129
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130 /**
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131 * Marker interface for a LIR operation that moves a value from {@link #getInput()} to {@link #getResult()}.
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132 */
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133 public interface MoveOp {
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134 Value getInput();
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135 Value getResult();
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136 }
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137
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138 /**
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139 * Marker interface for a LIR operation that calls a method, i.e., destroys all caller-saved registers.
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140 */
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141 public interface CallOp {
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142 }
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143
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144
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145 /**
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146 * Meta-operation that defines the incoming method parameters. In the LIR, every register and variable must be
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147 * defined before it is used. This operation is the definition point of method parameters, but is otherwise a no-op.
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148 * In particular, it is not the actual method prologue.
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149 */
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150 public static final class ParametersOp extends LIRInstruction {
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151 @Def({REG, STACK}) protected Value[] params;
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152
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153 public ParametersOp(Value[] params) {
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154 this.params = params;
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155 }
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156
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157 @Override
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158 public void emitCode(TargetMethodAssembler tasm) {
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159 // No code to emit.
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160 }
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161 }
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162 }