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annotate truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/generator/DSLExpressionGenerator.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children
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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 com.oracle.truffle.dsl.processor.expression.DSLExpression;
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26 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Binary;
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27 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Call;
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28 import com.oracle.truffle.dsl.processor.expression.DSLExpression.DSLExpressionVisitor;
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29 import com.oracle.truffle.dsl.processor.expression.DSLExpression.IntLiteral;
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30 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Negate;
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31 import com.oracle.truffle.dsl.processor.expression.DSLExpression.Variable;
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32 import com.oracle.truffle.dsl.processor.java.model.CodeTree;
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33 import com.oracle.truffle.dsl.processor.java.model.CodeTreeBuilder;
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34 import java.util.ArrayDeque;
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35 import java.util.Deque;
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36 import java.util.Map;
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37 import javax.lang.model.element.Element;
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38 import javax.lang.model.element.ElementKind;
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39 import javax.lang.model.element.ExecutableElement;
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40 import javax.lang.model.element.Modifier;
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41 import javax.lang.model.element.VariableElement;
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42 import javax.lang.model.type.TypeKind;
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43
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44 public class DSLExpressionGenerator implements DSLExpressionVisitor {
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45
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46 private final Map<Variable, CodeTree> bindings;
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47 private final CodeTree root;
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48 private final Deque<CodeTree> stack = new ArrayDeque<>();
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49
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50 public DSLExpressionGenerator(CodeTree root, Map<Variable, CodeTree> bindings) {
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51 this.bindings = bindings;
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52 this.root = root;
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53 }
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54
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55 public void visitBinary(Binary binary) {
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56 CodeTree right = stack.pop();
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57 CodeTree left = stack.pop();
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58 stack.push(combine(left, string(" " + binary.getOperator() + " "), right));
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59 }
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60
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61 public void visitCall(Call call) {
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62 ExecutableElement method = call.getResolvedMethod();
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63 CodeTree[] parameters = new CodeTree[method.getParameters().size()];
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64 for (int i = 0; i < parameters.length; i++) {
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65 parameters[parameters.length - i - 1] = pop();
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66 }
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67
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68 CodeTreeBuilder builder = CodeTreeBuilder.createBuilder();
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69
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70 if (call.getResolvedMethod().getKind() == ElementKind.CONSTRUCTOR) {
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71 builder.startNew(call.getResolvedType());
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72 } else if (call.getReceiver() == null) {
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73 if (isStatic(method)) {
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74 builder.startStaticCall(method);
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75 } else {
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76 if (root != null) {
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77 builder.tree(root).string(".");
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78 }
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79 builder.startCall(method.getSimpleName().toString());
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80 }
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81 } else {
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82 if (isStatic(method)) {
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83 throw new AssertionError("Static calls must not have receivers.");
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84 }
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85 builder.startCall(pop(), method.getSimpleName().toString());
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86 }
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87 for (CodeTree parameter : parameters) {
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88 builder.tree(parameter);
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89 }
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90 builder.end();
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91
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92 push(builder.build());
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93 }
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94
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95 public void visitIntLiteral(IntLiteral binary) {
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96 push(string(binary.getLiteral()));
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97 }
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98
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99 public void visitNegate(Negate negate) {
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100 push(combine(string("!"), combine(string("("), pop(), string(")"))));
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101 }
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102
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103 public void visitVariable(Variable variable) {
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104 VariableElement resolvedVariable = variable.getResolvedVariable();
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105 CodeTree tree;
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106 if (variable.getResolvedType().getKind() == TypeKind.NULL) {
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107 tree = CodeTreeBuilder.singleString("null");
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108 } else if (variable.getReceiver() == null) {
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109
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110 if (isStatic(resolvedVariable)) {
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111 tree = staticReference(resolvedVariable);
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112 } else {
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113 tree = bindings.get(variable);
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114 boolean bound = true;
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115 if (tree == null) {
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116 tree = string(resolvedVariable.getSimpleName().toString());
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117 bound = false;
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118 }
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119 if (root != null && !bound) {
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120 tree = combine(root, string("."), tree);
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121 }
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122 }
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123 } else {
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124 if (isStatic(resolvedVariable)) {
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125 throw new AssertionError("Static variables cannot have receivers.");
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126 }
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127 tree = combine(pop(), string("."), string(resolvedVariable.getSimpleName().toString()));
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128 }
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129 push(tree);
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130 }
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131
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132 private static boolean isStatic(Element element) {
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133 return element.getModifiers().contains(Modifier.STATIC);
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134 }
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135
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136 private static CodeTree combine(CodeTree tree1, CodeTree tree2) {
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137 return new CodeTreeBuilder(null).startGroup().tree(tree1).tree(tree2).end().build();
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138 }
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139
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140 private static CodeTree combine(CodeTree tree1, CodeTree tree2, CodeTree tree3) {
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141 return new CodeTreeBuilder(null).startGroup().tree(tree1).tree(tree2).tree(tree3).end().build();
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142 }
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143
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144 private static CodeTree string(String s) {
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145 return CodeTreeBuilder.singleString(s);
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146 }
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147
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148 private static CodeTree staticReference(VariableElement var) {
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149 return CodeTreeBuilder.createBuilder().staticReference(var.getEnclosingElement().asType(), var.getSimpleName().toString()).build();
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150 }
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151
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152 private void push(CodeTree tree) {
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153 stack.push(tree);
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154 }
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155
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156 private CodeTree pop() {
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157 return stack.pop();
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158 }
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159
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160 public static CodeTree write(DSLExpression expression, CodeTree root, Map<Variable, CodeTree> bindings) {
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161 DSLExpressionGenerator writer = new DSLExpressionGenerator(root, bindings);
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162 expression.accept(writer);
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163 return combine(string("("), writer.pop(), string(")"));
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164 }
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165
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166 }