--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/debug/PrintVisitor.java 2020-04-15 18:48:20.000000000 +0530 +++ /dev/null 2020-04-15 18:48:20.000000000 +0530 @@ -1,436 +0,0 @@ -/* - * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package jdk.nashorn.internal.ir.debug; - -import java.util.List; -import jdk.nashorn.internal.ir.BinaryNode; -import jdk.nashorn.internal.ir.Block; -import jdk.nashorn.internal.ir.BlockStatement; -import jdk.nashorn.internal.ir.BreakNode; -import jdk.nashorn.internal.ir.CaseNode; -import jdk.nashorn.internal.ir.CatchNode; -import jdk.nashorn.internal.ir.ContinueNode; -import jdk.nashorn.internal.ir.ExpressionStatement; -import jdk.nashorn.internal.ir.ForNode; -import jdk.nashorn.internal.ir.FunctionNode; -import jdk.nashorn.internal.ir.IdentNode; -import jdk.nashorn.internal.ir.IfNode; -import jdk.nashorn.internal.ir.JoinPredecessor; -import jdk.nashorn.internal.ir.JoinPredecessorExpression; -import jdk.nashorn.internal.ir.LabelNode; -import jdk.nashorn.internal.ir.LocalVariableConversion; -import jdk.nashorn.internal.ir.Node; -import jdk.nashorn.internal.ir.SplitNode; -import jdk.nashorn.internal.ir.Statement; -import jdk.nashorn.internal.ir.SwitchNode; -import jdk.nashorn.internal.ir.ThrowNode; -import jdk.nashorn.internal.ir.TryNode; -import jdk.nashorn.internal.ir.UnaryNode; -import jdk.nashorn.internal.ir.VarNode; -import jdk.nashorn.internal.ir.WhileNode; -import jdk.nashorn.internal.ir.WithNode; -import jdk.nashorn.internal.ir.visitor.SimpleNodeVisitor; - -/** - * Print out the AST as human readable source code. - * This works both on lowered and unlowered ASTs - * - * see the flags --print-parse and --print-lower-parse - */ -public final class PrintVisitor extends SimpleNodeVisitor { - /** Tab width */ - private static final int TABWIDTH = 4; - - /** Composing buffer. */ - private final StringBuilder sb; - - /** Indentation factor. */ - private int indent; - - /** Line separator. */ - private final String EOLN; - - /** Print line numbers */ - private final boolean printLineNumbers; - - /** Print inferred and optimistic types */ - private final boolean printTypes; - - private int lastLineNumber = -1; - - /** - * Constructor. - */ - public PrintVisitor() { - this(true, true); - } - - /** - * Constructor - * - * @param printLineNumbers should line number nodes be included in the output? - * @param printTypes should we print optimistic and inferred types? - */ - public PrintVisitor(final boolean printLineNumbers, final boolean printTypes) { - this.EOLN = System.lineSeparator(); - this.sb = new StringBuilder(); - this.printLineNumbers = printLineNumbers; - this.printTypes = printTypes; - } - - /** - * Constructor - * - * @param root a node from which to start printing code - */ - public PrintVisitor(final Node root) { - this(root, true, true); - } - - /** - * Constructor - * - * @param root a node from which to start printing code - * @param printLineNumbers should line numbers nodes be included in the output? - * @param printTypes should we print optimistic and inferred types? - */ - public PrintVisitor(final Node root, final boolean printLineNumbers, final boolean printTypes) { - this(printLineNumbers, printTypes); - visit(root); - } - - private void visit(final Node root) { - root.accept(this); - } - - @Override - public String toString() { - return sb.append(EOLN).toString(); - } - - /** - * Insert spaces before a statement. - */ - private void indent() { - for (int i = indent; i > 0; i--) { - sb.append(' '); - } - } - - /* - * Visits. - */ - - @Override - public boolean enterDefault(final Node node) { - node.toString(sb, printTypes); - return false; - } - - @Override - public boolean enterContinueNode(final ContinueNode node) { - node.toString(sb, printTypes); - printLocalVariableConversion(node); - return false; - } - - @Override - public boolean enterBreakNode(final BreakNode node) { - node.toString(sb, printTypes); - printLocalVariableConversion(node); - return false; - } - - @Override - public boolean enterThrowNode(final ThrowNode node) { - node.toString(sb, printTypes); - printLocalVariableConversion(node); - return false; - } - - @Override - public boolean enterBlock(final Block block) { - sb.append(' '); - sb.append('{'); - - indent += TABWIDTH; - - final List statements = block.getStatements(); - - for (final Statement statement : statements) { - if (printLineNumbers) { - final int lineNumber = statement.getLineNumber(); - sb.append('\n'); - if (lineNumber != lastLineNumber) { - indent(); - sb.append("[|").append(lineNumber).append("|];").append('\n'); - } - lastLineNumber = lineNumber; - } - indent(); - - statement.accept(this); - - int lastIndex = sb.length() - 1; - char lastChar = sb.charAt(lastIndex); - while (Character.isWhitespace(lastChar) && lastIndex >= 0) { - lastChar = sb.charAt(--lastIndex); - } - - if (lastChar != '}' && lastChar != ';') { - sb.append(';'); - } - - if (statement.hasGoto()) { - sb.append(" [GOTO]"); - } - - if (statement.isTerminal()) { - sb.append(" [TERMINAL]"); - } - } - - indent -= TABWIDTH; - - sb.append(EOLN); - indent(); - sb.append('}'); - printLocalVariableConversion(block); - - return false; - } - - @Override - public boolean enterBlockStatement(final BlockStatement statement) { - statement.getBlock().accept(this); - return false; - } - - @Override - public boolean enterBinaryNode(final BinaryNode binaryNode) { - binaryNode.lhs().accept(this); - sb.append(' '); - sb.append(binaryNode.tokenType()); - sb.append(' '); - binaryNode.rhs().accept(this); - return false; - } - - @Override - public boolean enterJoinPredecessorExpression(final JoinPredecessorExpression expr) { - expr.getExpression().accept(this); - printLocalVariableConversion(expr); - return false; - } - - @Override - public boolean enterIdentNode(final IdentNode identNode) { - identNode.toString(sb, printTypes); - printLocalVariableConversion(identNode); - return true; - } - - private void printLocalVariableConversion(final JoinPredecessor joinPredecessor) { - LocalVariableConversion.toString(joinPredecessor.getLocalVariableConversion(), sb); - } - - @Override - public boolean enterUnaryNode(final UnaryNode unaryNode) { - unaryNode.toString(sb, new Runnable() { - @Override - public void run() { - unaryNode.getExpression().accept(PrintVisitor.this); - } - }, printTypes); - return false; - } - - @Override - public boolean enterExpressionStatement(final ExpressionStatement expressionStatement) { - expressionStatement.getExpression().accept(this); - return false; - } - - @Override - public boolean enterForNode(final ForNode forNode) { - forNode.toString(sb, printTypes); - forNode.getBody().accept(this); - return false; - } - - @Override - public boolean enterFunctionNode(final FunctionNode functionNode) { - functionNode.toString(sb, printTypes); - enterBlock(functionNode.getBody()); - return false; - } - - @Override - public boolean enterIfNode(final IfNode ifNode) { - ifNode.toString(sb, printTypes); - ifNode.getPass().accept(this); - - final Block fail = ifNode.getFail(); - - if (fail != null) { - sb.append(" else "); - fail.accept(this); - } - if(ifNode.getLocalVariableConversion() != null) { - assert fail == null; - sb.append(" else "); - printLocalVariableConversion(ifNode); - sb.append(";"); - } - return false; - } - - @Override - public boolean enterLabelNode(final LabelNode labeledNode) { - indent -= TABWIDTH; - indent(); - indent += TABWIDTH; - labeledNode.toString(sb, printTypes); - labeledNode.getBody().accept(this); - printLocalVariableConversion(labeledNode); - return false; - } - - @Override - public boolean enterSplitNode(final SplitNode splitNode) { - splitNode.toString(sb, printTypes); - sb.append(EOLN); - indent += TABWIDTH; - indent(); - return true; - } - - @Override - public Node leaveSplitNode(final SplitNode splitNode) { - sb.append(""); - sb.append(EOLN); - indent -= TABWIDTH; - indent(); - return splitNode; - } - - @Override - public boolean enterSwitchNode(final SwitchNode switchNode) { - switchNode.toString(sb, printTypes); - sb.append(" {"); - - final List cases = switchNode.getCases(); - - for (final CaseNode caseNode : cases) { - sb.append(EOLN); - indent(); - caseNode.toString(sb, printTypes); - printLocalVariableConversion(caseNode); - indent += TABWIDTH; - caseNode.getBody().accept(this); - indent -= TABWIDTH; - sb.append(EOLN); - } - if(switchNode.getLocalVariableConversion() != null) { - sb.append(EOLN); - indent(); - sb.append("default: "); - printLocalVariableConversion(switchNode); - sb.append("{}"); - } - sb.append(EOLN); - indent(); - sb.append("}"); - - return false; - } - - @Override - public boolean enterTryNode(final TryNode tryNode) { - tryNode.toString(sb, printTypes); - printLocalVariableConversion(tryNode); - tryNode.getBody().accept(this); - - final List catchBlocks = tryNode.getCatchBlocks(); - - for (final Block catchBlock : catchBlocks) { - final CatchNode catchNode = (CatchNode)catchBlock.getStatements().get(0); - catchNode.toString(sb, printTypes); - catchNode.getBody().accept(this); - } - - final Block finallyBody = tryNode.getFinallyBody(); - - if (finallyBody != null) { - sb.append(" finally "); - finallyBody.accept(this); - } - - for (final Block inlinedFinally : tryNode.getInlinedFinallies()) { - inlinedFinally.accept(this); - } - return false; - } - - @Override - public boolean enterVarNode(final VarNode varNode) { - sb.append(varNode.isConst() ? "const " : varNode.isLet() ? "let " : "var "); - varNode.getName().toString(sb, printTypes); - printLocalVariableConversion(varNode.getName()); - final Node init = varNode.getInit(); - if (init != null) { - sb.append(" = "); - init.accept(this); - } - - return false; - } - - @Override - public boolean enterWhileNode(final WhileNode whileNode) { - printLocalVariableConversion(whileNode); - if (whileNode.isDoWhile()) { - sb.append("do"); - whileNode.getBody().accept(this); - sb.append(' '); - whileNode.toString(sb, printTypes); - } else { - whileNode.toString(sb, printTypes); - whileNode.getBody().accept(this); - } - - return false; - } - - @Override - public boolean enterWithNode(final WithNode withNode) { - withNode.toString(sb, printTypes); - withNode.getBody().accept(this); - - return false; - } - -}