jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/ir/TryNode.java@19263eb2ff0c (annotated)

src/jdk/nashorn/internal/ir/TryNode.java@19263eb2ff0c (annotated)

src/jdk/nashorn/internal/ir/TryNode.java

Fri, 05 Jun 2015 14:46:52 +0530

author: sundar
date: Fri, 05 Jun 2015 14:46:52 +0530
changeset 1397: 19263eb2ff0c
parent 1372: 644d9b9c97ed
child 1490: d85f981c8cf8
child 1536: bb0fac71c1da
permissions: -rw-r--r--

8081809: Missing final modifier in method parameters (nashorn code convention)
Reviewed-by: attila, lagergren

 /*
  * 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;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import jdk.nashorn.internal.ir.annotations.Immutable;
 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
 /**
  * IR representation of a TRY statement.
  */
 @Immutable
 public final class TryNode extends LexicalContextStatement implements JoinPredecessor {
     private static final long serialVersionUID = 1L;
     /** Try statements. */
     private final Block body;
     /** List of catch clauses. */
     private final List<Block> catchBlocks;
     /** Finally clause. */
     private final Block finallyBody;
     /**
      * List of inlined finally blocks. The structure of every inlined finally is:
      * Block(LabelNode(label, Block(finally-statements, (JumpStatement|ReturnNode)?))).
      * That is, the block has a single LabelNode statement with the label and a block containing the
      * statements of the inlined finally block with the jump or return statement appended (if the finally
      * block was not terminal; the original jump/return is simply ignored if the finally block itself
      * terminates). The reason for this somewhat strange arrangement is that we didn't want to create a
      * separate class for the (label, BlockStatement pair) but rather reused the already available LabelNode.
      * However, if we simply used List&lt;LabelNode&gt; without wrapping the label nodes in an additional Block,
      * that would've thrown off visitors relying on BlockLexicalContext -- same reason why we never use
      * Statement as the type of bodies of e.g. IfNode, WhileNode etc. but rather blockify them even when they're
      * single statements.
      */
     private final List<Block> inlinedFinallies;
     /** Exception symbol. */
     private Symbol exception;
     private final LocalVariableConversion conversion;
     /**
      * Constructor
      *
      * @param lineNumber  lineNumber
      * @param token       token
      * @param finish      finish
      * @param body        try node body
      * @param catchBlocks list of catch blocks in order
      * @param finallyBody body of finally block or null if none
      */
     public TryNode(final int lineNumber, final long token, final int finish, final Block body, final List<Block> catchBlocks, final Block finallyBody) {
         super(lineNumber, token, finish);
         this.body        = body;
         this.catchBlocks = catchBlocks;
         this.finallyBody = finallyBody;
         this.conversion  = null;
         this.inlinedFinallies = Collections.emptyList();
     }
     private TryNode(final TryNode tryNode, final Block body, final List<Block> catchBlocks, final Block finallyBody, final LocalVariableConversion conversion, final List<Block> inlinedFinallies) {
         super(tryNode);
         this.body        = body;
         this.catchBlocks = catchBlocks;
         this.finallyBody = finallyBody;
         this.conversion  = conversion;
         this.inlinedFinallies = inlinedFinallies;
         this.exception = tryNode.exception;
     }
     @Override
     public Node ensureUniqueLabels(final LexicalContext lc) {
         //try nodes are never in lex context
         return new TryNode(this, body, catchBlocks, finallyBody, conversion, inlinedFinallies);
     }
     @Override
     public boolean isTerminal() {
         if (body.isTerminal()) {
             for (final Block catchBlock : getCatchBlocks()) {
                 if (!catchBlock.isTerminal()) {
                     return false;
                 }
             }
             return true;
         }
         return false;
     }
     /**
      * Assist in IR navigation.
      * @param visitor IR navigating visitor.
      */
     @Override
     public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) {
         if (visitor.enterTryNode(this)) {
             // Need to do finallybody first for termination analysis. TODO still necessary?
             final Block newFinallyBody = finallyBody == null ? null : (Block)finallyBody.accept(visitor);
             final Block newBody        = (Block)body.accept(visitor);
             return visitor.leaveTryNode(
                 setBody(lc, newBody).
                 setFinallyBody(lc, newFinallyBody).
                 setCatchBlocks(lc, Node.accept(visitor, catchBlocks)).
                 setInlinedFinallies(lc, Node.accept(visitor, inlinedFinallies)));
         }
         return this;
     }
     @Override
     public void toString(final StringBuilder sb, final boolean printType) {
         sb.append("try ");
     }
     /**
      * Get the body for this try block
      * @return body
      */
     public Block getBody() {
         return body;
     }
     /**
      * Reset the body of this try block
      * @param lc current lexical context
      * @param body new body
      * @return new TryNode or same if unchanged
      */
     public TryNode setBody(final LexicalContext lc, final Block body) {
         if (this.body == body) {
             return this;
         }
         return Node.replaceInLexicalContext(lc, this, new TryNode(this,  body, catchBlocks, finallyBody, conversion, inlinedFinallies));
     }
     /**
      * Get the catches for this try block
      * @return a list of catch nodes
      */
     public List<CatchNode> getCatches() {
         final List<CatchNode> catches = new ArrayList<>(catchBlocks.size());
         for (final Block catchBlock : catchBlocks) {
             catches.add(getCatchNodeFromBlock(catchBlock));
         }
         return Collections.unmodifiableList(catches);
     }
     private static CatchNode getCatchNodeFromBlock(final Block catchBlock) {
         return (CatchNode)catchBlock.getStatements().get(0);
     }
     /**
      * Get the catch blocks for this try block
      * @return a list of blocks
      */
     public List<Block> getCatchBlocks() {
         return Collections.unmodifiableList(catchBlocks);
     }
     /**
      * Set the catch blocks of this try
      * @param lc current lexical context
      * @param catchBlocks list of catch blocks
      * @return new TryNode or same if unchanged
      */
     public TryNode setCatchBlocks(final LexicalContext lc, final List<Block> catchBlocks) {
         if (this.catchBlocks == catchBlocks) {
             return this;
         }
         return Node.replaceInLexicalContext(lc, this, new TryNode(this, body, catchBlocks, finallyBody, conversion, inlinedFinallies));
     }
     /**
      * Get the exception symbol for this try block
      * @return a symbol for the compiler to store the exception in
      */
     public Symbol getException() {
         return exception;
     }
     /**
      * Set the exception symbol for this try block
      * @param exception a symbol for the compiler to store the exception in
      * @return new TryNode or same if unchanged
      */
     public TryNode setException(final Symbol exception) {
         this.exception = exception;
         return this;
     }
     /**
      * Get the body of the finally clause for this try
      * @return finally body, or null if no finally
      */
     public Block getFinallyBody() {
         return finallyBody;
     }
     /**
      * Get the inlined finally block with the given label name. This returns the actual finally block in the
      * {@link LabelNode}, not the outer wrapper block for the {@link LabelNode}.
      * @param labelName the name of the inlined finally's label
      * @return the requested finally block, or null if no finally block's label matches the name.
      */
     public Block getInlinedFinally(final String labelName) {
         for(final Block inlinedFinally: inlinedFinallies) {
             final LabelNode labelNode = getInlinedFinallyLabelNode(inlinedFinally);
             if (labelNode.getLabelName().equals(labelName)) {
                 return labelNode.getBody();
             }
         }
         return null;
     }
     private static LabelNode getInlinedFinallyLabelNode(final Block inlinedFinally) {
         return (LabelNode)inlinedFinally.getStatements().get(0);
     }
     /**
      * Given an outer wrapper block for the {@link LabelNode} as returned by {@link #getInlinedFinallies()},
      * returns its actual inlined finally block.
      * @param inlinedFinally the outer block for inlined finally, as returned as an element of
      * {@link #getInlinedFinallies()}.
      * @return the block contained in the {@link LabelNode} contained in the passed block.
      */
     public static Block getLabelledInlinedFinallyBlock(final Block inlinedFinally) {
         return getInlinedFinallyLabelNode(inlinedFinally).getBody();
     }
     /**
      * Returns a list of inlined finally blocks. Note that this returns a list of {@link Block}s such that each one of
      * them has a single {@link LabelNode}, which in turn contains the label name for the finally block and the
      * actual finally block. To safely extract the actual finally block, use
      * {@link #getLabelledInlinedFinallyBlock(Block)}.
      * @return a list of inlined finally blocks.
      */
     public List<Block> getInlinedFinallies() {
         return Collections.unmodifiableList(inlinedFinallies);
     }
     /**
      * Set the finally body of this try
      * @param lc current lexical context
      * @param finallyBody new finally body
      * @return new TryNode or same if unchanged
      */
     public TryNode setFinallyBody(final LexicalContext lc, final Block finallyBody) {
         if (this.finallyBody == finallyBody) {
             return this;
         }
         return Node.replaceInLexicalContext(lc, this, new TryNode(this, body, catchBlocks, finallyBody, conversion, inlinedFinallies));
     }
     /**
      * Set the inlined finally blocks of this try. Each element should be a block with a single statement that is a
      * {@link LabelNode} with a unique label, and the block within the label node should contain the actual inlined
      * finally block.
      * @param lc current lexical context
      * @param inlinedFinallies list of inlined finally blocks
      * @return new TryNode or same if unchanged
      */
     public TryNode setInlinedFinallies(final LexicalContext lc, final List<Block> inlinedFinallies) {
         if (this.inlinedFinallies == inlinedFinallies) {
             return this;
         }
         assert checkInlinedFinallies(inlinedFinallies);
         return Node.replaceInLexicalContext(lc, this, new TryNode(this, body, catchBlocks, finallyBody, conversion, inlinedFinallies));
     }
     private static boolean checkInlinedFinallies(final List<Block> inlinedFinallies) {
         if (!inlinedFinallies.isEmpty()) {
             final Set<String> labels = new HashSet<>();
             for (final Block inlinedFinally : inlinedFinallies) {
                 final List<Statement> stmts = inlinedFinally.getStatements();
                 assert stmts.size() == 1;
                 final LabelNode ln = getInlinedFinallyLabelNode(inlinedFinally);
                 assert labels.add(ln.getLabelName()); // unique label
             }
         }
         return true;
     }
     @Override
     public JoinPredecessor setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) {
         if(this.conversion == conversion) {
             return this;
         }
         return new TryNode(this, body, catchBlocks, finallyBody, conversion, inlinedFinallies);
     }
     @Override
     public LocalVariableConversion getLocalVariableConversion() {
         return conversion;
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/internal/ir/TryNode.java@19263eb2ff0c (annotated)

src/jdk/nashorn/internal/ir/TryNode.java