Mercurial > hg > truffle
view truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/debug/SuspendedEvent.java @ 22548:6b76a24fffbd default tip
Use all variables: a, b, u,v and x, y
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Thu, 14 Jan 2016 14:20:57 +0100 |
parents | be8a3334434d |
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/* * Copyright (c) 2015, 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 com.oracle.truffle.api.debug; import java.io.IOException; import java.io.PrintStream; import java.util.Collections; import java.util.List; import com.oracle.truffle.api.CompilerDirectives; import com.oracle.truffle.api.frame.FrameInstance; import com.oracle.truffle.api.frame.MaterializedFrame; import com.oracle.truffle.api.instrument.StandardSyntaxTag; import com.oracle.truffle.api.nodes.Node; /** * This event is delivered to all * {@link com.oracle.truffle.api.vm.PolyglotEngine.Builder#onEvent(com.oracle.truffle.api.vm.EventConsumer) * registered event handlers} when an execution is suspended on a * {@link Debugger#setLineBreakpoint(int, com.oracle.truffle.api.source.LineLocation, boolean) * breakpoint} or during {@link #prepareStepInto(int) stepping}. Methods in this event can only be * used while the handlers process the event. Then the state of the event becomes invalid and * subsequent calls to the event methods yield {@link IllegalStateException}. One can call * {@link #getDebugger()} and keep reference to it for as long as necessary. */ @SuppressWarnings("javadoc") public final class SuspendedEvent { private static boolean TRACE = false; private static final String TRACE_PREFIX = "EVENT: "; private static final PrintStream OUT = System.out; private static void trace(String format, Object... args) { if (TRACE) { OUT.println(TRACE_PREFIX + String.format(format, args)); } } private final Debugger debugger; private final Node haltedNode; private final MaterializedFrame haltedFrame; private final List<FrameInstance> stack; private final List<String> warnings; SuspendedEvent(Debugger debugger, Node haltedNode, MaterializedFrame haltedFrame, List<FrameInstance> stack, List<String> warnings) { this.debugger = debugger; this.haltedNode = haltedNode; this.haltedFrame = haltedFrame; this.stack = stack; this.warnings = warnings; if (TRACE) { trace("Execution suspended at Node=" + haltedNode); } } /** * Debugger associated with the just suspended execution. This debugger remains valid after the * event is processed, it is possible and suggested to keep a reference to it and use it any * time later when evaluating sources in the {@link com.oracle.truffle.api.vm.PolyglotEngine}. * * @return instance of debugger associated with the just suspended execution and any subsequent * ones in the same {@link com.oracle.truffle.api.vm.PolyglotEngine}. */ public Debugger getDebugger() { return debugger; } public Node getNode() { return haltedNode; } public MaterializedFrame getFrame() { return haltedFrame; } public List<String> getRecentWarnings() { return Collections.unmodifiableList(warnings); } /** * Gets the stack frames from the currently halted * {@link com.oracle.truffle.api.vm.PolyglotEngine} execution, not counting the Node and Frame * where halted. * * @return list of stack frames */ @CompilerDirectives.TruffleBoundary public List<FrameInstance> getStack() { return stack; } /** * Prepare to execute in Continue mode when guest language program execution resumes. In this * mode: * <ul> * <li>Execution will continue until either: * <ol> * <li>execution arrives at a node to which an enabled breakpoint is attached, * <strong>or:</strong></li> * <li>execution completes.</li> * </ol> * </ul> */ public void prepareContinue() { debugger.prepareContinue(-1); } /** * Prepare to execute in StepInto mode when guest language program execution resumes. In this * mode: * <ul> * <li>User breakpoints are disabled.</li> * <li>Execution will continue until either: * <ol> * <li>execution arrives at a node with the tag {@linkplain StandardSyntaxTag#STATEMENT * STATMENT}, <strong>or:</strong></li> * <li>execution completes.</li> * </ol> * <li>StepInto mode persists only through one resumption (i.e. {@code stepIntoCount} steps), * and reverts by default to Continue mode.</li> * </ul> * * @param stepCount the number of times to perform StepInto before halting * @throws IllegalArgumentException if the specified number is {@code <= 0} */ public void prepareStepInto(int stepCount) { debugger.prepareStepInto(stepCount); } /** * Prepare to execute in StepOut mode when guest language program execution resumes. In this * mode: * <ul> * <li>User breakpoints are enabled.</li> * <li>Execution will continue until either: * <ol> * <li>execution arrives at the nearest enclosing call site on the stack, <strong>or</strong></li> * <li>execution completes.</li> * </ol> * <li>StepOut mode persists only through one resumption, and reverts by default to Continue * mode.</li> * </ul> */ public void prepareStepOut() { debugger.prepareStepOut(); } /** * Prepare to execute in StepOver mode when guest language program execution resumes. In this * mode: * <ul> * <li>Execution will continue until either: * <ol> * <li>execution arrives at a node with the tag {@linkplain StandardSyntaxTag#STATEMENT * STATEMENT} when not nested in one or more function/method calls, <strong>or:</strong></li> * <li>execution arrives at a node to which a breakpoint is attached and when nested in one or * more function/method calls, <strong>or:</strong></li> * <li>execution completes.</li> * </ol> * <li>StepOver mode persists only through one resumption (i.e. {@code stepOverCount} steps), * and reverts by default to Continue mode.</li> * </ul> * * @param stepCount the number of times to perform StepInto before halting * @throws IllegalArgumentException if the specified number is {@code <= 0} */ public void prepareStepOver(int stepCount) { debugger.prepareStepOver(stepCount); } /** * Evaluates given code snippet in the context of currently suspended execution. * * @param code the snippet to evaluate * @param frame the frame in which to evaluate the code; { means the current frame at the halted * location. * @return the computed value * @throws IOException in case an evaluation goes wrong */ public Object eval(String code, FrameInstance frame) throws IOException { return debugger.evalInContext(this, code, frame); } }