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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import scalac.util.Debug;
/**
* Information about a compiler phase.
*/
public final class PhaseDescriptor {
//########################################################################
// Public Constants
public static final int STOP = 0x0001;
public static final int SKIP = 0x0002;
public static final int PRINT = 0x0004;
public static final int GRAPH = 0x0008;
public static final int CHECK = 0x0010;
public static final int LOG = 0x0020;
//########################################################################
// Public Functions
/** Freezes the given phases (patches flags and assigns ids). */
public static void freeze(PhaseDescriptor[] phases) {
// there are at least two phases: INITIAL and TERMINAL
assert phases.length >= 2;
if (phases.length == 0) return;
// propagate STOP and SKIP
for (int i = 0; i < phases.length - 1; i++) {
phases[i].flags |= (phases[i + 1].flags >>> 16) & (STOP | SKIP);
phases[i+1].flags &= ~((STOP | SKIP) << 16);
}
// transform STOP flags into SKIP flags
boolean stop = false;
for (int i = 0; i < phases.length; i++) {
if (stop) phases[i].flags |= SKIP;
stop |= phases[i].hasStopFlag();
if (stop) phases[i].flags &= ~STOP;
}
// remove SKIP flag on INITIAL and TERMINAL phases
phases[0].flags &= ~SKIP;
phases[phases.length - 1].flags &= ~SKIP;
// propagate other flags and freeze remaining phases
PhaseDescriptor last = null;
for (int i = 0; i < phases.length; i++) {
phases[i].id = i;
if (phases[i].hasSkipFlag()) continue;
if (last != null) last.flags |= phases[i].flags >>> 16;
phases[i].flags &= 0x0000FFFF;
last = phases[i];
}
}
//########################################################################
// Private Fields
/** The phase name */
private final String name;
/** The phase description */
private final String description;
/** The phase task description */
private final String task;
/** The phase implementation class */
private final Class clasz;
/** The flags of this phase */
private int flags;
/** The phase instance */
private Phase phase;
/** The phase identifier */
private int id = -1;
//########################################################################
// Public Constructors
/** Initializes this instance. */
public PhaseDescriptor(String name, String description, String task,
Class clasz)
{
this.name = name;
this.description = description;
this.task = task;
this.clasz = clasz;
}
//########################################################################
// Public Methods
/** Returns the one-word name of this phase. */
public String name() {
return name;
}
/** Returns a one-line description of this phase. */
public String description() {
return description;
}
/** Returns a one-line task description of this phase. */
public String taskDescription() {
return task;
}
/** Creates the object implementing this phase. */
public Phase create(Global global) {
assert id >= 0 : "phase " + name + " not yet frozen";
assert phase == null : "phase " + name + " already created";
try {
Class[] params = { Global.class, PhaseDescriptor.class };
Object[] args = { global, this };
Constructor constructor = clasz.getConstructor(params);
return phase = (Phase)constructor.newInstance(args);
} catch (NoSuchMethodException exception) {
throw Debug.abort(exception);
} catch (IllegalAccessException exception) {
throw Debug.abort(exception);
} catch (InstantiationException exception) {
throw Debug.abort(exception);
} catch (InvocationTargetException exception) {
throw Debug.abort(exception);
}
}
/** Returns the object implementing this phase. */
public Phase phase() {
assert phase != null : "phase " + name + " not yet created";
return phase;
}
/** Returns the identifier of this phase. */
public int id() {
assert id >= 0 : "phase " + name + " not yet frozen";
return id;
}
/** Adds the given flag (to previous phase if prev is true). */
public void addFlag(int flag, boolean prev) {
assert id < 0 : "phase " + name + " already frozen";
flags |= flag << (prev ? 16 : 0);
}
/** Adds the SKIP flag. */
public void addSkipFlag() {
flags |= SKIP;
}
/** Adds the CHECK flag. */
public void addCheckFlag() {
flags |= CHECK;
}
/** Adds the PRINT flag. */
public void addPrintFlag() {
flags |= PRINT;
}
/** Adds the GRAPH flag. */
public void addGraphFlag() {
flags |= GRAPH;
}
/** Adds the STOP flag. */
public void addStopFlag() {
flags |= STOP;
}
/** Adds the LOG flag. */
public void addLogFlag() {
flags |= LOG;
}
/** Has this phase the SKIP flag? */
public boolean hasSkipFlag() {
return (flags & SKIP) != 0;
}
/** Has this phase the CHECK flag? */
public boolean hasCheckFlag() {
return (flags & CHECK) != 0;
}
/** Has this phase the PRINT flag? */
public boolean hasPrintFlag() {
return (flags & PRINT) != 0;
}
/** Has this phase the GRAPH flag? */
public boolean hasGraphFlag() {
return (flags & GRAPH) != 0;
}
/** Has this phase the STOP flag? */
public boolean hasStopFlag() {
return (flags & STOP) != 0;
}
/** Has this phase the LOG flag? */
public boolean hasLogFlag() {
return (flags & LOG) != 0;
}
/** Returns the name of this phase. */
public String toString() {
return name();
}
//########################################################################
}
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