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annotate graal/com.oracle.graal.lir/src/com/oracle/graal/lir/StandardOp.java @ 8293:ae7e78091f03

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Cleanup branching and jumps in LIRGenerator: JumpOp/BranchOp do not need a state. In emitBranch, emitNullCheckBranch, emitCompareBranch, emitOverflowCheckBranch and emitIntegerTestBranch both targets are always provided.
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 14 Mar 2013 13:43:57 +0100
parents caa932ca99b3
children 1fa6536416db
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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32 * specific kinds or LIR operations.
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33 */
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34 public class StandardOp {
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35
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36 /**
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37 * Marker interface for LIR ops that can fall through to the next operation, like a switch
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38 * statement. setFallThroughTarget(null) can be used to make the operation fall through to the
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39 * next one.
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40 */
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41 public interface FallThroughOp {
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42
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43 LabelRef fallThroughTarget();
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44
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45 void setFallThroughTarget(LabelRef target);
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46 }
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47
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48 /**
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49 * LIR operation that defines the position of a label. The first operation of every block must
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50 * implement this interface.
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51 */
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52 public static class LabelOp extends LIRInstruction {
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53
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54 private final Label label;
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55 private final boolean align;
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56
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57 public LabelOp(Label label, boolean align) {
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58 this.label = label;
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59 this.align = align;
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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 tasm.asm.bind(label);
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68 }
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69
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70 public Label getLabel() {
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71 return label;
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72 }
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73 }
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74
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75 /**
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76 * LIR operation that is an unconditional jump to {@link #destination()}. When the LIR is
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77 * constructed, the last operation of every block must implement this interface. After register
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78 * allocation, unnecessary jumps can be deleted.
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79 */
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80 public static class JumpOp extends LIRInstruction {
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81
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82 private final LabelRef destination;
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83
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84 public JumpOp(LabelRef destination) {
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85 this.destination = destination;
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86 }
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87
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88 @Override
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89 public void emitCode(TargetMethodAssembler tasm) {
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90 tasm.asm.jmp(destination.label());
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91 }
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92
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93 public LabelRef destination() {
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94 return destination;
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95 }
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96 }
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97
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98 /**
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99 * Marker interface for a LIR operation that is a conditional jump to {@link #destination()}.
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100 * Conditional jumps may be negated or optimized away after register allocation.
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101 */
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102 public interface BranchOp {
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103
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104 LabelRef destination();
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105
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106 void negate(LabelRef newDestination);
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107 }
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108
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109 /**
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110 * Marker interface for a LIR operation that moves a value from {@link #getInput()} to
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111 * {@link #getResult()}.
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112 */
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113 public interface MoveOp {
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114
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115 Value getInput();
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116
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117 Value getResult();
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118 }
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119
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120 /**
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121 * Marker interface for a LIR operation that calls a method, i.e., destroys all caller-saved
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122 * registers.
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123 */
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124 public interface CallOp {
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125 }
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126
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127 /**
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128 * Meta-operation that defines the incoming method parameters. In the LIR, every register and
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129 * variable must be defined before it is used. This operation is the definition point of method
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130 * parameters, but is otherwise a no-op. In particular, it is not the actual method prologue.
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131 */
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132 public static final class ParametersOp extends LIRInstruction {
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133
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134 @Def({REG, STACK}) protected Value[] params;
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135
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136 public ParametersOp(Value[] params) {
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137 this.params = params;
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138 }
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139
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140 @Override
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141 public void emitCode(TargetMethodAssembler tasm) {
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142 // No code to emit.
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143 }
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144 }
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145 }