Mercurial > hg > truffle
annotate graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/generator/DSLExpressionGenerator.java @ 19283:08aa0372dad4
Truffle-DSL: implement new guard expression syntax.
author | Christian Humer <christian.humer@gmail.com> |
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date | Fri, 23 Jan 2015 02:55:23 +0100 |
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children | 62c43fcf5be2 |
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19283
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1 /* |
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2 * Copyright (c) 2015, 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.truffle.dsl.processor.generator; |
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24 |
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25 import java.util.*; |
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26 |
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27 import javax.lang.model.element.*; |
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28 |
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29 import com.oracle.truffle.dsl.processor.expression.*; |
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30 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Binary; |
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31 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Call; |
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32 import com.oracle.truffle.dsl.processor.expression.DSLExpression.DSLExpressionVisitor; |
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33 import com.oracle.truffle.dsl.processor.expression.DSLExpression.IntLiteral; |
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34 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Negate; |
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35 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Variable; |
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36 import com.oracle.truffle.dsl.processor.java.model.*; |
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37 |
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38 public class DSLExpressionGenerator implements DSLExpressionVisitor { |
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39 |
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40 private final Map<Variable, CodeTree> bindings; |
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41 private final CodeTree root; |
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42 private final Deque<CodeTree> stack = new ArrayDeque<>(); |
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43 |
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44 public DSLExpressionGenerator(CodeTree root, Map<Variable, CodeTree> bindings) { |
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45 this.bindings = bindings; |
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46 this.root = root; |
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47 } |
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48 |
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49 public void visitBinary(Binary binary) { |
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50 CodeTree right = stack.pop(); |
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51 CodeTree left = stack.pop(); |
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52 stack.push(combine(left, string(" " + binary.getOperator() + " "), right)); |
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53 } |
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54 |
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55 public void visitCall(Call call) { |
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56 ExecutableElement method = call.getResolvedMethod(); |
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57 CodeTree[] parameters = new CodeTree[method.getParameters().size()]; |
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58 for (int i = 0; i < parameters.length; i++) { |
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59 parameters[parameters.length - i - 1] = pop(); |
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60 } |
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61 |
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62 CodeTreeBuilder builder = CodeTreeBuilder.createBuilder(); |
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63 |
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64 if (call.getReceiver() == null) { |
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65 if (isStatic(method)) { |
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66 builder.startStaticCall(method); |
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67 } else { |
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68 if (root != null) { |
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69 builder.tree(root).string("."); |
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70 } |
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71 builder.startCall(method.getSimpleName().toString()); |
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72 } |
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73 } else { |
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74 if (isStatic(method)) { |
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75 throw new AssertionError("Static calls must not have receivers."); |
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76 } |
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77 builder.startCall(pop(), method.getSimpleName().toString()); |
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78 } |
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79 for (CodeTree parameter : parameters) { |
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80 builder.tree(parameter); |
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81 } |
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82 builder.end(); |
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83 |
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84 push(builder.build()); |
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85 } |
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86 |
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87 public void visitIntLiteral(IntLiteral binary) { |
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88 push(string(binary.getLiteral())); |
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89 } |
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90 |
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91 public void visitNegate(Negate negate) { |
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92 push(combine(string("!"), pop())); |
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93 } |
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94 |
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95 public void visitVariable(Variable variable) { |
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96 VariableElement resolvedVariable = variable.getResolvedVariable(); |
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97 CodeTree tree; |
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98 if (variable.getReceiver() == null) { |
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99 |
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100 if (isStatic(resolvedVariable)) { |
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101 tree = staticReference(resolvedVariable); |
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102 } else { |
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103 tree = bindings.get(variable); |
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104 boolean bound = true; |
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105 if (tree == null) { |
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106 tree = string(resolvedVariable.getSimpleName().toString()); |
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107 bound = false; |
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108 } |
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109 if (root != null && !bound) { |
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110 tree = combine(root, string("."), tree); |
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111 } |
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112 } |
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113 } else { |
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114 if (isStatic(resolvedVariable)) { |
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115 throw new AssertionError("Static variables cannot have receivers."); |
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116 } |
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117 tree = combine(pop(), string("."), string(resolvedVariable.getSimpleName().toString())); |
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118 } |
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119 push(tree); |
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120 } |
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121 |
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122 private static boolean isStatic(Element element) { |
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123 return element.getModifiers().contains(Modifier.STATIC); |
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124 } |
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125 |
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126 private static CodeTree combine(CodeTree tree1, CodeTree tree2) { |
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127 return new CodeTreeBuilder(null).startGroup().tree(tree1).tree(tree2).end().build(); |
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128 } |
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129 |
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130 private static CodeTree combine(CodeTree tree1, CodeTree tree2, CodeTree tree3) { |
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131 return new CodeTreeBuilder(null).startGroup().tree(tree1).tree(tree2).tree(tree3).end().build(); |
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132 } |
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133 |
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134 private static CodeTree string(String s) { |
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135 return CodeTreeBuilder.singleString(s); |
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136 } |
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137 |
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138 private static CodeTree staticReference(VariableElement var) { |
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139 return CodeTreeBuilder.createBuilder().staticReference(var.asType(), var.getSimpleName().toString()).build(); |
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140 } |
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141 |
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142 private void push(CodeTree tree) { |
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143 stack.push(tree); |
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144 } |
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145 |
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146 private CodeTree pop() { |
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147 return stack.pop(); |
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148 } |
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149 |
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150 public static CodeTree write(DSLExpression expression, CodeTree root, Map<Variable, CodeTree> bindings) { |
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151 DSLExpressionGenerator writer = new DSLExpressionGenerator(root, bindings); |
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152 expression.accept(writer); |
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153 return writer.pop(); |
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154 } |
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155 |
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156 } |