+++ /dev/null
-/*******************************************************************************
- * Copyright (c) 2000, 2004 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.jdt.internal.compiler.flow;
-
-import org.eclipse.jdt.internal.compiler.impl.Constant;
-import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
-import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
-import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
-
-/**
- * Record initialization status during definite assignment analysis
- *
- * No caching of pre-allocated instances.
- */
-public class UnconditionalFlowInfo extends FlowInfo {
-
-
- public long definiteInits;
- public long potentialInits;
- public long extraDefiniteInits[];
- public long extraPotentialInits[];
-
- public int reachMode; // by default
-
- public int maxFieldCount;
-
- // Constants
- public static final int BitCacheSize = 64; // 64 bits in a long.
-
- UnconditionalFlowInfo() {
- this.reachMode = REACHABLE;
- }
-
- // unions of both sets of initialization - used for try/finally
- public FlowInfo addInitializationsFrom(FlowInfo inits) {
-
- if (this == DEAD_END)
- return this;
-
- UnconditionalFlowInfo otherInits = inits.unconditionalInits();
- if (otherInits == DEAD_END)
- return this;
-
- // union of definitely assigned variables,
- definiteInits |= otherInits.definiteInits;
- // union of potentially set ones
- potentialInits |= otherInits.potentialInits;
-
- // treating extra storage
- if (extraDefiniteInits != null) {
- if (otherInits.extraDefiniteInits != null) {
- // both sides have extra storage
- int i = 0, length, otherLength;
- if ((length = extraDefiniteInits.length) < (otherLength = otherInits.extraDefiniteInits.length)) {
- // current storage is shorter -> grow current (could maybe reuse otherInits extra storage?)
- System.arraycopy(extraDefiniteInits, 0, (extraDefiniteInits = new long[otherLength]), 0, length);
- System.arraycopy(extraPotentialInits, 0, (extraPotentialInits = new long[otherLength]), 0, length);
- while (i < length) {
- extraDefiniteInits[i] |= otherInits.extraDefiniteInits[i];
- extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- while (i < otherLength) {
- extraPotentialInits[i] = otherInits.extraPotentialInits[i++];
- }
- } else {
- // current storage is longer
- while (i < otherLength) {
- extraDefiniteInits[i] |= otherInits.extraDefiniteInits[i];
- extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- while (i < length)
- extraDefiniteInits[i++] = 0;
- }
- } else {
- // no extra storage on otherInits
- }
- } else
- if (otherInits.extraDefiniteInits != null) {
- // no storage here, but other has extra storage.
- int otherLength;
- System.arraycopy(otherInits.extraDefiniteInits, 0, (extraDefiniteInits = new long[otherLength = otherInits.extraDefiniteInits.length]), 0, otherLength);
- System.arraycopy(otherInits.extraPotentialInits, 0, (extraPotentialInits = new long[otherLength]), 0, otherLength);
- }
- return this;
- }
-
- // unions of both sets of initialization - used for try/finally
- public FlowInfo addPotentialInitializationsFrom(FlowInfo inits) {
-
- if (this == DEAD_END){
- return this;
- }
-
- UnconditionalFlowInfo otherInits = inits.unconditionalInits();
- if (otherInits == DEAD_END){
- return this;
- }
- // union of potentially set ones
- potentialInits |= otherInits.potentialInits;
-
- // treating extra storage
- if (extraDefiniteInits != null) {
- if (otherInits.extraDefiniteInits != null) {
- // both sides have extra storage
- int i = 0, length, otherLength;
- if ((length = extraDefiniteInits.length) < (otherLength = otherInits.extraDefiniteInits.length)) {
- // current storage is shorter -> grow current (could maybe reuse otherInits extra storage?)
- System.arraycopy(extraDefiniteInits, 0, (extraDefiniteInits = new long[otherLength]), 0, length);
- System.arraycopy(extraPotentialInits, 0, (extraPotentialInits = new long[otherLength]), 0, length);
- while (i < length) {
- extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- while (i < otherLength) {
- extraPotentialInits[i] = otherInits.extraPotentialInits[i++];
- }
- } else {
- // current storage is longer
- while (i < otherLength) {
- extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- }
- }
- } else
- if (otherInits.extraDefiniteInits != null) {
- // no storage here, but other has extra storage.
- int otherLength;
- extraDefiniteInits = new long[otherLength = otherInits.extraDefiniteInits.length];
- System.arraycopy(otherInits.extraPotentialInits, 0, (extraPotentialInits = new long[otherLength]), 0, otherLength);
- }
- return this;
- }
-
- /**
- * Answers a copy of the current instance
- */
- public FlowInfo copy() {
-
- // do not clone the DeadEnd
- if (this == DEAD_END)
- return this;
-
- // look for an unused preallocated object
- UnconditionalFlowInfo copy = new UnconditionalFlowInfo();
-
- // copy slots
- copy.definiteInits = this.definiteInits;
- copy.potentialInits = this.potentialInits;
- copy.reachMode = this.reachMode;
- copy.maxFieldCount = this.maxFieldCount;
-
- if (this.extraDefiniteInits != null) {
- int length;
- System.arraycopy(this.extraDefiniteInits, 0, (copy.extraDefiniteInits = new long[ (length = extraDefiniteInits.length)]), 0, length);
- System.arraycopy(this.extraPotentialInits, 0, (copy.extraPotentialInits = new long[length]), 0, length);
- }
- return copy;
- }
-
- public UnconditionalFlowInfo discardFieldInitializations(){
-
- int limit = this.maxFieldCount;
-
- if (limit < BitCacheSize) {
- long mask = (1L << limit)-1;
- this.definiteInits &= ~mask;
- this.potentialInits &= ~mask;
- return this;
- }
-
- this.definiteInits = 0;
- this.potentialInits = 0;
-
- // use extra vector
- if (extraDefiniteInits == null) {
- return this; // if vector not yet allocated, then not initialized
- }
- int vectorIndex, length = this.extraDefiniteInits.length;
- if ((vectorIndex = (limit / BitCacheSize) - 1) >= length) {
- return this; // not enough room yet
- }
- for (int i = 0; i < vectorIndex; i++) {
- this.extraDefiniteInits[i] = 0L;
- this.extraPotentialInits[i] = 0L;
- }
- long mask = (1L << (limit % BitCacheSize))-1;
- this.extraDefiniteInits[vectorIndex] &= ~mask;
- this.extraPotentialInits[vectorIndex] &= ~mask;
- return this;
- }
-
- public UnconditionalFlowInfo discardNonFieldInitializations(){
-
- int limit = this.maxFieldCount;
-
- if (limit < BitCacheSize) {
- long mask = (1L << limit)-1;
- this.definiteInits &= mask;
- this.potentialInits &= mask;
- return this;
- }
- // use extra vector
- if (extraDefiniteInits == null) {
- return this; // if vector not yet allocated, then not initialized
- }
- int vectorIndex, length = this.extraDefiniteInits.length;
- if ((vectorIndex = (limit / BitCacheSize) - 1) >= length) {
- return this; // not enough room yet
- }
- long mask = (1L << (limit % BitCacheSize))-1;
- this.extraDefiniteInits[vectorIndex] &= mask;
- this.extraPotentialInits[vectorIndex] &= mask;
- for (int i = vectorIndex+1; i < length; i++) {
- this.extraDefiniteInits[i] = 0L;
- this.extraPotentialInits[i] = 0L;
- }
- return this;
- }
-
- public FlowInfo initsWhenFalse() {
-
- return this;
- }
-
- public FlowInfo initsWhenTrue() {
-
- return this;
- }
-
- /**
- * Check status of definite assignment at a given position.
- * It deals with the dual representation of the InitializationInfo2:
- * bits for the first 64 entries, then an array of booleans.
- */
- final private boolean isDefinitelyAssigned(int position) {
-
- // Dependant of CodeStream.isDefinitelyAssigned(..)
- // id is zero-based
- if (position < BitCacheSize) {
- return (definiteInits & (1L << position)) != 0; // use bits
- }
- // use extra vector
- if (extraDefiniteInits == null)
- return false; // if vector not yet allocated, then not initialized
- int vectorIndex;
- if ((vectorIndex = (position / BitCacheSize) - 1) >= extraDefiniteInits.length)
- return false; // if not enough room in vector, then not initialized
- return ((extraDefiniteInits[vectorIndex]) & (1L << (position % BitCacheSize))) != 0;
- }
-
- /**
- * Check status of definite assignment for a field.
- */
- final public boolean isDefinitelyAssigned(FieldBinding field) {
-
- // Dependant of CodeStream.isDefinitelyAssigned(..)
- // We do not want to complain in unreachable code
- if ((this.reachMode & UNREACHABLE) != 0)
- return true;
- return isDefinitelyAssigned(field.id);
- }
-
- /**
- * Check status of definite assignment for a local.
- */
- final public boolean isDefinitelyAssigned(LocalVariableBinding local) {
-
- // Dependant of CodeStream.isDefinitelyAssigned(..)
- // We do not want to complain in unreachable code
- if ((this.reachMode & UNREACHABLE) != 0)
- return true;
- if (local.isArgument) {
- return true;
- }
- // final constants are inlined, and thus considered as always initialized
- if (local.constant != Constant.NotAConstant) {
- return true;
- }
- return isDefinitelyAssigned(local.id + maxFieldCount);
- }
-
- public boolean isReachable() {
-
- return this.reachMode == REACHABLE;
- }
-
- /**
- * Check status of potential assignment at a given position.
- * It deals with the dual representation of the InitializationInfo3:
- * bits for the first 64 entries, then an array of booleans.
- */
- final private boolean isPotentiallyAssigned(int position) {
-
- // id is zero-based
- if (position < BitCacheSize) {
- // use bits
- return (potentialInits & (1L << position)) != 0;
- }
- // use extra vector
- if (extraPotentialInits == null)
- return false; // if vector not yet allocated, then not initialized
- int vectorIndex;
- if ((vectorIndex = (position / BitCacheSize) - 1) >= extraPotentialInits.length)
- return false; // if not enough room in vector, then not initialized
- return ((extraPotentialInits[vectorIndex]) & (1L << (position % BitCacheSize))) != 0;
- }
-
- /**
- * Check status of definite assignment for a field.
- */
- final public boolean isPotentiallyAssigned(FieldBinding field) {
-
- return isPotentiallyAssigned(field.id);
- }
-
- /**
- * Check status of potential assignment for a local.
- */
- final public boolean isPotentiallyAssigned(LocalVariableBinding local) {
-
- if (local.isArgument) {
- return true;
- }
- // final constants are inlined, and thus considered as always initialized
- if (local.constant != Constant.NotAConstant) {
- return true;
- }
- return isPotentiallyAssigned(local.id + maxFieldCount);
- }
-
- /**
- * Record a definite assignment at a given position.
- * It deals with the dual representation of the InitializationInfo2:
- * bits for the first 64 entries, then an array of booleans.
- */
- final private void markAsDefinitelyAssigned(int position) {
-
- if (this != DEAD_END) {
-
- // position is zero-based
- if (position < BitCacheSize) {
- // use bits
- long mask;
- definiteInits |= (mask = 1L << position);
- potentialInits |= mask;
- } else {
- // use extra vector
- int vectorIndex = (position / BitCacheSize) - 1;
- if (extraDefiniteInits == null) {
- int length;
- extraDefiniteInits = new long[length = vectorIndex + 1];
- extraPotentialInits = new long[length];
- } else {
- int oldLength; // might need to grow the arrays
- if (vectorIndex >= (oldLength = extraDefiniteInits.length)) {
- System.arraycopy(extraDefiniteInits, 0, (extraDefiniteInits = new long[vectorIndex + 1]), 0, oldLength);
- System.arraycopy(extraPotentialInits, 0, (extraPotentialInits = new long[vectorIndex + 1]), 0, oldLength);
- }
- }
- long mask;
- extraDefiniteInits[vectorIndex] |= (mask = 1L << (position % BitCacheSize));
- extraPotentialInits[vectorIndex] |= mask;
- }
- }
- }
-
- /**
- * Record a field got definitely assigned.
- */
- public void markAsDefinitelyAssigned(FieldBinding field) {
- if (this != DEAD_END)
- markAsDefinitelyAssigned(field.id);
- }
-
- /**
- * Record a local got definitely assigned.
- */
- public void markAsDefinitelyAssigned(LocalVariableBinding local) {
- if (this != DEAD_END)
- markAsDefinitelyAssigned(local.id + maxFieldCount);
- }
-
- /**
- * Clear initialization information at a given position.
- * It deals with the dual representation of the InitializationInfo2:
- * bits for the first 64 entries, then an array of booleans.
- */
- final private void markAsDefinitelyNotAssigned(int position) {
- if (this != DEAD_END) {
-
- // position is zero-based
- if (position < BitCacheSize) {
- // use bits
- long mask;
- definiteInits &= ~(mask = 1L << position);
- potentialInits &= ~mask;
- } else {
- // use extra vector
- int vectorIndex = (position / BitCacheSize) - 1;
- if (extraDefiniteInits == null) {
- return; // nothing to do, it was not yet set
- }
- // might need to grow the arrays
- if (vectorIndex >= extraDefiniteInits.length) {
- return; // nothing to do, it was not yet set
- }
- long mask;
- extraDefiniteInits[vectorIndex] &= ~(mask = 1L << (position % BitCacheSize));
- extraPotentialInits[vectorIndex] &= ~mask;
- }
- }
- }
-
- /**
- * Clear the initialization info for a field
- */
- public void markAsDefinitelyNotAssigned(FieldBinding field) {
-
- if (this != DEAD_END)
- markAsDefinitelyNotAssigned(field.id);
- }
-
- /**
- * Clear the initialization info for a local variable
- */
-
- public void markAsDefinitelyNotAssigned(LocalVariableBinding local) {
-
- if (this != DEAD_END)
- markAsDefinitelyNotAssigned(local.id + maxFieldCount);
- }
-
- /**
- * Returns the receiver updated in the following way: <ul>
- * <li> intersection of definitely assigned variables,
- * <li> union of potentially assigned variables.
- * </ul>
- */
- public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits) {
-
- if (this == DEAD_END) return otherInits;
- if (otherInits == DEAD_END) return this;
-
- if ((this.reachMode & UNREACHABLE) != (otherInits.reachMode & UNREACHABLE)){
- if ((this.reachMode & UNREACHABLE) != 0){
- return otherInits;
- }
- return this;
- }
-
- // if one branch is not fake reachable, then the merged one is reachable
- this.reachMode &= otherInits.reachMode;
-
- // intersection of definitely assigned variables,
- this.definiteInits &= otherInits.definiteInits;
- // union of potentially set ones
- this.potentialInits |= otherInits.potentialInits;
-
- // treating extra storage
- if (this.extraDefiniteInits != null) {
- if (otherInits.extraDefiniteInits != null) {
- // both sides have extra storage
- int i = 0, length, otherLength;
- if ((length = this.extraDefiniteInits.length) < (otherLength = otherInits.extraDefiniteInits.length)) {
- // current storage is shorter -> grow current (could maybe reuse otherInits extra storage?)
- System.arraycopy(this.extraDefiniteInits, 0, (this.extraDefiniteInits = new long[otherLength]), 0, length);
- System.arraycopy(this.extraPotentialInits, 0, (this.extraPotentialInits = new long[otherLength]), 0, length);
- while (i < length) {
- this.extraDefiniteInits[i] &= otherInits.extraDefiniteInits[i];
- this.extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- while (i < otherLength) {
- this.extraPotentialInits[i] = otherInits.extraPotentialInits[i++];
- }
- } else {
- // current storage is longer
- while (i < otherLength) {
- this.extraDefiniteInits[i] &= otherInits.extraDefiniteInits[i];
- this.extraPotentialInits[i] |= otherInits.extraPotentialInits[i++];
- }
- while (i < length)
- this.extraDefiniteInits[i++] = 0;
- }
- } else {
- // no extra storage on otherInits
- int i = 0, length = this.extraDefiniteInits.length;
- while (i < length)
- this.extraDefiniteInits[i++] = 0;
- }
- } else
- if (otherInits.extraDefiniteInits != null) {
- // no storage here, but other has extra storage.
- int otherLength;
- this.extraDefiniteInits = new long[otherLength = otherInits.extraDefiniteInits.length];
- System.arraycopy(otherInits.extraPotentialInits, 0, (this.extraPotentialInits = new long[otherLength]), 0, otherLength);
- }
- return this;
- }
-
- /*
- * Answer the total number of fields in enclosing types of a given type
- */
- static int numberOfEnclosingFields(ReferenceBinding type){
-
- int count = 0;
- type = type.enclosingType();
- while(type != null) {
- count += type.fieldCount();
- type = type.enclosingType();
- }
- return count;
- }
-
- public int reachMode(){
- return this.reachMode;
- }
-
- public FlowInfo setReachMode(int reachMode) {
-
- if (this == DEAD_END) return this; // cannot modify DEAD_END
-
- // reset optional inits when becoming unreachable
- if ((this.reachMode & UNREACHABLE) == 0 && (reachMode & UNREACHABLE) != 0) {
- this.potentialInits = 0;
- if (this.extraPotentialInits != null){
- for (int i = 0, length = this.extraPotentialInits.length; i < length; i++){
- this.extraPotentialInits[i] = 0;
- }
- }
- }
- this.reachMode = reachMode;
-
- return this;
- }
-
- public String toString(){
-
- if (this == DEAD_END){
- return "FlowInfo.DEAD_END"; //$NON-NLS-1$
- }
- return "FlowInfo<def: "+ this.definiteInits //$NON-NLS-1$
- +", pot: " + this.potentialInits //$NON-NLS-1$
- + ", reachable:" + ((this.reachMode & UNREACHABLE) == 0) //$NON-NLS-1$
- +">"; //$NON-NLS-1$
- }
-
- public UnconditionalFlowInfo unconditionalInits() {
-
- // also see conditional inits, where it requests them to merge
- return this;
- }
-}
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