forked from jasder/antlr
* Redefine checkVersion as version mismatch detection instead of a compatibility check
* Update notification behavior to notify callback listeners instead of throwing an exception * Remove the distinction between regular and "extended" semantics
This commit is contained in:
Sam Harwell
parent
e4e1cb1845
commit
80125d661e
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@ -33,11 +33,14 @@ package org.antlr.v4.runtime;
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import org.antlr.v4.runtime.misc.NotNull;
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import org.antlr.v4.runtime.misc.Nullable;
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import java.util.Collection;
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import java.util.concurrent.CopyOnWriteArraySet;
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/**
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* This class provides access to the current version of the ANTLR 4 runtime
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* library as compile-time and runtime constants, along with methods for
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* verifying a minimum level compatibility before executing code which depends
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* on the ANTLR 4 runtime library.
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* checking for matching version numbers and notifying listeners in the case
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* where a version mismatch is detected.
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*
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* <p>
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* The runtime version information is provided by {@link #VERSION} and
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@ -45,23 +48,30 @@ import org.antlr.v4.runtime.misc.Nullable;
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* provided in the documentation for each member.</p>
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*
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* <p>
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* The runtime compatibility check is implemented by {@link #checkVersion}.
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* Detailed information about incorporating this call into user code, as well as
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* its use in generated code, is provided in the documentation for the
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* method.</p>
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* The runtime version check is implemented by {@link #checkVersion}. Detailed
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* information about incorporating this call into user code, as well as its use
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* in generated code, is provided in the documentation for the method.</p>
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*
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* <p>
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* By default, the {@link ConsoleListener#INSTANCE} listener is
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* automatically registered, and reports mismatched versions to
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* {@link System#err}. This default listener may be removed by calling
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* {@link #removeListener} or {@link #clearListeners}, and may be
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* re-registered by calling {@link #addListener}.</p>
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*/
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public class RuntimeMetaData {
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/**
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* This exception is thrown to indicate that the version of ANTLR used to
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* generate and/or compile a parser is not compatible with the currently
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* executing version of the runtime library.
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* This class provides detailed information about a mismatch between the
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* version of the tool a parser was generated with, the version of the
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* runtime a parser was compiled against, and/or the currently executing
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* version of the runtime.
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*
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* @see #checkVersion
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*/
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public static class ANTLRVersionMismatchException extends Exception {
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public static class VersionMismatchDetails {
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/**
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* The version of the ANTLR 4 Tool a parser was generated with. This
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* value may be {@code null} if the version check was called from
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* value may be {@code null} if {@link #checkVersion} was called from
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* user-defined code instead of a call automatically included in the
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* generated parser.
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*/
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@ -75,41 +85,138 @@ public class RuntimeMetaData {
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public final String compileTimeRuntimeVersion;
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/**
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* Constructs a new instance of the
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* {@link ANTLRVersionMismatchException} class with the specified
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* detailed information about a runtime library version compatibility
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* error.
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* Constructs a new instance of the {@link VersionMismatchDetails} class
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* with the specified detailed information about a mismatch between
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* ANTLR tool and runtime versions used by a parser.
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*
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* @param message A description of the incompatibility between the Tool
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* version, the compile-time runtime version, and/or the currently
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* executing runtime version
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* @param generatingToolVersion The version of the ANTLR 4 Tool a parser
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* was generated with, or {@code null} if the version check was not part
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* of the automatically-generated parser code
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* @param compileTimeRuntimeVersion The version of the ANTLR 4 Runtime
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* library the code was compiled against
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*/
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public ANTLRVersionMismatchException(String message, String generatingToolVersion, String compileTimeRuntimeVersion) {
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super(message);
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VersionMismatchDetails(@Nullable String generatingToolVersion, @NotNull String compileTimeRuntimeVersion) {
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this.generatingToolVersion = generatingToolVersion;
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this.compileTimeRuntimeVersion = compileTimeRuntimeVersion;
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}
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@Override
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public String getMessage() {
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return super.getMessage() + ": Tool version " + generatingToolVersion + "; compile-time runtime version " + compileTimeRuntimeVersion;
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}
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/**
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* This interface defines a listener which handles notifications about
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* mismatched ANTLR Tool and/or Runtime versions.
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*/
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public interface Listener {
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/**
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* Report a version mismatch which was detected by
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* {@link #checkDetails}.
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*
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* <p>Note that if a registered listener throws an exception during the
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* handling of this event, the following will be impacted:</p>
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*
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* <ul>
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* <li>The lexer or parser which called {@link #checkVersion} will be
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* unusable due to throwing an exception in a static initializer
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* block.</li>
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* <li>No additional registered listeners will be notified about the
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* version mismatch.</li>
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* </ul>
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*
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* @param details a {@link VersionMismatchDetails} instance containing
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* detailed information about the specific version mismatch detected
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*/
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void reportVersionMismatch(@NotNull VersionMismatchDetails details);
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}
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/**
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* This class provides a basic implementation of {@link Listener} which
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* writes information about mismatched versions to {@link System#err}.
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*/
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public static class ConsoleListener implements Listener {
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/**
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* A default instance of {@link ConsoleListener} which is automatically
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* registered to receive version mismatch events.
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*/
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public static final ConsoleListener INSTANCE = new ConsoleListener();
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/**
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* {@inheritDoc}
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*/
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@Override
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public void reportVersionMismatch(@NotNull VersionMismatchDetails details) {
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String message;
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String referenceVersion;
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if (details.generatingToolVersion != null && !VERSION.equals(details.generatingToolVersion)) {
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referenceVersion = details.generatingToolVersion;
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message = "ANTLR Tool version %s used for code generation does not match the current runtime version %s";
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}
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else if (!VERSION.equals(details.compileTimeRuntimeVersion)) {
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referenceVersion = details.compileTimeRuntimeVersion;
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message = "ANTLR Runtime version %s used for parser compilation does not match the current runtime version %s";
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}
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else {
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referenceVersion = "";
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message = "The ANTLR Runtime reported a version mismatch against the current runtime version %s%s";
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}
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String formatted = String.format(message, referenceVersion, VERSION);
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System.err.println(formatted);
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}
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}
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/**
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* The list of listeners registered to receive notifications of mismatched
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* ANTLR versions.
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*/
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private static final Collection<Listener> listeners = new CopyOnWriteArraySet<Listener>();
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static {
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listeners.add(ConsoleListener.INSTANCE);
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}
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/**
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* Register a listener to receive notifications of mismatched ANTLR
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* versions.
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*
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* @param listener the listener to notify if mismatched ANTLR versions are
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* detected
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*
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* @see #checkVersion
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*/
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public static void addListener(@NotNull Listener listener) {
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listeners.add(listener);
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}
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/**
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* Remove a specific listener registered to receive notifications of
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* mismatched ANTLR versions.
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*
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* @param listener the listener to remove
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* @return {@code true} if the listener was removed; otherwise,
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* {@code false} if the specified listener was not found in the list of
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* registered listeners
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*/
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public static boolean removeListener(@NotNull Listener listener) {
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return listeners.remove(listener);
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}
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/**
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* Remove all listeners registered to receive notifications of mismatched
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* ANTLR versions.
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*/
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public static void clearListeners() {
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listeners.clear();
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}
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/**
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* A compile-time constant containing the current version of the ANTLR 4
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* runtime library.
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*
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* <p>This compile-time constant value allows generated parsers and other
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* <p>
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* This compile-time constant value allows generated parsers and other
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* libraries to include a literal reference to the version of the ANTLR 4
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* runtime library the code was compiled against.</p>
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*
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* <p>During development (between releases), this value contains the
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* <p>
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* During development (between releases), this value contains the
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* <em>expected</em> next release version. For official releases, the value
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* will be the actual published version of the library.</p>
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*/
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@ -118,7 +225,8 @@ public class RuntimeMetaData {
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/**
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* Gets the currently executing version of the ANTLR 4 runtime library.
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*
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* <p>This method provides runtime access to the {@link #VERSION} field, as
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* <p>
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* This method provides runtime access to the {@link #VERSION} field, as
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* opposed to directly referencing the field as a compile-time constant.</p>
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*
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* @return The currently executing version of the ANTLR 4 library
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@ -129,59 +237,44 @@ public class RuntimeMetaData {
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}
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/**
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* This method provides the ability to verify that the version of the ANTLR
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* 4 used to execute a parser is compatible with the Tool used to generate
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* the parser code and/or the version of the runtime the parser was compiled
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* against.
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* This method provides the ability to detect mismatches between the version
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* of ANTLR 4 used to generate a parser, the version of the ANTLR runtime a
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* parser was compiled against, and the version of the ANTLR runtime which
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* is currently executing.
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*
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* <p>
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* Starting with ANTLR 4.2.3, the code generator emits two constants in each
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* generated parser: a hard-coded constant indicating the version of the
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* tool used to generate the parser and a reference to the compile-time
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* constant {@link #VERSION}. At runtime, this method is called to ensure
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* that, according to the version numbers, the semantics of the generated
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* code are known to be compatible with the version of the ANTLR runtime
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* used to execute code.</p>
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* Starting with ANTLR 4.2.3, the code generator emits a call to this method
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* using two constants in each generated lexer and parser: a hard-coded
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* constant indicating the version of the tool used to generate the parser
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* and a reference to the compile-time constant {@link #VERSION}. At
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* runtime, this method is called during the initialization of the generated
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* parser to detect mismatched versions, and notify the registered listeners
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* prior to creating instances of the parser.</p>
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*
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* <p>
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* The definition of "semantic changes" which are considered by this method
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* depend on the value of {@code extendedSemantics}. When this value is
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* {@code false}, as is the case for calls to this method in generated code,
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* "semantic changes" means changes in the runtime that alter the behavior
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* of parsers that use only standardized language features, which does not
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* include the behavior of target-language-specific features such as
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* embedded actions, custom semantic predicates, and runtime methods that
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* are never called by the generated code but may be overridden in separate
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* user code. When this value is {@code true}, "semantic changes" indicates
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* a wider check across frequently used aspects of the runtime. The latter
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* case may or may not consider all breaking changes across releases; for
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* details on the specific methods in place see the release notes for the
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* affected version(s).</p>
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* This method does not perform any detection or filtering of semantic
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* changes between tool and runtime versions. It simply checks for a simple
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* version match and notifies the registered listeners any time a difference
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* is detected.</p>
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*
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* <p>
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* Note that if this method throws an exception when
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* {@code extendedSemantics} is {@code false}, the lexer or parser which
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* resulted in the exception will be prevented from executing, so this
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* behavior is reserved for changes that are true breaking changes in the
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* behavior. These changes, if any, are mentioned in the release notes for
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* the affected release.</p>
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* Note that some breaking changes between releases could result in other
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* types of runtime exceptions, such as a {@link LinkageError}, prior to
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* calling this method. In these cases, the underlying version mismatch will
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* not be reported to the listeners. This method is primarily intended to
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* notify users of potential semantic changes between releases that do not
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* result in binary compatibility problems which would be detected by the
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* class loader. As with semantic changes, changes which break binary
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* compatibility between releases are mentioned in the release notes
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* accompanying the affected release.</p>
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*
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* <p>
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* Also note that some breaking changes between releases could result in
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* other types of runtime exceptions, such as a {@link LinkageError}, prior
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* to calling this method. This method is primarily intended to catch
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* semantic changes that do not result in binary compatibility problems
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* which would be detected by the class loader. As with semantic changes,
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* changes which break binary compatibility between releases are mentioned
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* in the release notes accompanying the affected release.</p>
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*
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* <p>
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* <strong>Additional note for target developers:</strong> The compatibility
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* check implemented by this class is designed to address specific
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* compatibility issues that may arise during the execution of Java
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* applications. Other targets should consider the implementation of this
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* method in the context of that target's known execution environment, which
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* may or may not resemble the design provided for the Java target.</p>
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* <strong>Additional note for target developers:</strong> The version check
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* implemented by this class is designed to address specific compatibility
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* concerns that may arise during the execution of Java applications. Other
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* targets should consider the implementation of this method in the context
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* of that target's known execution environment, which may or may not
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* resemble the design provided for the Java target.</p>
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*
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* @param toolVersion The version of the tool used to generate a parser.
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* This value may be null when called from user code that was not generated
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@ -189,26 +282,21 @@ public class RuntimeMetaData {
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* @param compileTimeVersion The version of the runtime the parser was
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* compiled against. This should always be passed using a direct reference
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* to {@link #VERSION}.
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* @param extendedSemantics {@code false} to only check compatibility for
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* the API used in generated code, not counting embedded actions and
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* semantic predicates; otherwise, {@code true} to check compatibility
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* across a wider range of frequently-used features that are commonly used
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* in user-defined embedded actions and/or semantic predicates.
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*
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* @exception ANTLRVersionMismatchException if the version of the ANTLR
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* runtime used to execute a compiled parser contains semantic changes which
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* would alter the behavior of the generated code
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*/
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public static void checkVersion(@Nullable String toolVersion, @NotNull String compileTimeVersion, boolean extendedSemantics) throws ANTLRVersionMismatchException {
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/* Currently there are no versions of the ANTLR runtime library which
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* are incompatible with respect to this method.
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*
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* * Prior to ANTLR 4.2.3, the ANTLR tool did not emit calls to this
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* method in the generated code, and did not expose the VERSION
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* field. For the specific purposes of this compatibility check, the
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* "first public release" of ANTLR 4 can be treated as 4.2.3.
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* * If an incompatibility is introduced in a version after 4.2.3,
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* specific handling for the affected versions can be added.
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*/
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public static void checkVersion(@Nullable String toolVersion, @NotNull String compileTimeVersion) {
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boolean report = false;
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if (toolVersion != null && !VERSION.equals(toolVersion)) {
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report = true;
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}
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else if (!VERSION.equals(compileTimeVersion)) {
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report = true;
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}
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if (report) {
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VersionMismatchDetails details = new VersionMismatchDetails(toolVersion, compileTimeVersion);
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for (Listener listener : listeners) {
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listener.reportVersionMismatch(details);
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}
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}
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}
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}
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@ -214,14 +214,7 @@ Parser(parser, funcs, atn, sempredFuncs, superClass) ::= <<
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Parser_(parser, funcs, atn, sempredFuncs, ctor, superClass) ::= <<
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@SuppressWarnings({"all", "warnings", "unchecked", "unused", "cast"})
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public class <parser.name> extends <superClass> {
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static {
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try {
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RuntimeMetaData.checkVersion("<file.ANTLRVersion>", RuntimeMetaData.VERSION, false);
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}
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catch (RuntimeMetaData.ANTLRVersionMismatchException ex) {
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throw new ExceptionInInitializerError(ex);
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}
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}
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static { RuntimeMetaData.checkVersion("<file.ANTLRVersion>", RuntimeMetaData.VERSION); }
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protected static final DFA[] _decisionToDFA;
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protected static final PredictionContextCache _sharedContextCache =
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@ -857,14 +850,7 @@ import org.antlr.v4.runtime.misc.*;
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Lexer(lexer, atn, actionFuncs, sempredFuncs, superClass) ::= <<
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@SuppressWarnings({"all", "warnings", "unchecked", "unused", "cast"})
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public class <lexer.name> extends <superClass> {
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static {
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try {
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RuntimeMetaData.checkVersion("<lexerFile.ANTLRVersion>", RuntimeMetaData.VERSION, false);
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}
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catch (RuntimeMetaData.ANTLRVersionMismatchException ex) {
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throw new ExceptionInInitializerError(ex);
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}
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}
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static { RuntimeMetaData.checkVersion("<lexerFile.ANTLRVersion>", RuntimeMetaData.VERSION); }
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protected static final DFA[] _decisionToDFA;
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protected static final PredictionContextCache _sharedContextCache =
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