/*******************************************************************************
* Copyright (c) 2000, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann <stephan@cs.tu-berlin.de> - Contributions for
* bug 325755 - [compiler] wrong initialization state after conditional expression
* bug 320170 - [compiler] [null] Whitebox issues in null analysis
* bug 292478 - Report potentially null across variable assignment
* bug 332637 - Dead Code detection removing code that isn't dead
* bug 341499 - [compiler][null] allocate extra bits in all methods of UnconditionalFlowInfo
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null"
* bug 386181 - [compiler][null] wrong transition in UnconditionalFlowInfo.mergedWith()
* bug 394768 - [compiler][resource] Incorrect resource leak warning when creating stream in conditional
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.flow;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
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;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
/**
* Record initialization status during definite assignment analysis
*
* No caching of pre-allocated instances.
*/
public class UnconditionalFlowInfo extends FlowInfo {
/**
* Exception raised when unexpected behavior is detected.
*/
public static class AssertionFailedException extends RuntimeException {
private static final long serialVersionUID = 1827352841030089703L;
public AssertionFailedException(String message) {
super(message);
}
}
// Coverage tests need that the code be instrumented. The following flag
// controls whether the instrumented code is compiled in or not, and whether
// the coverage tests methods run or not.
public final static boolean COVERAGE_TEST_FLAG = false;
// never release with the coverageTestFlag set to true
public static int CoverageTestId;
// assignment bits - first segment
public long definiteInits;
public long potentialInits;
// null bits - first segment
public long
nullBit1,
nullBit2,
nullBit3,
nullBit4;
/*
nullBit1
nullBit2...
0000 start
0001 pot. unknown
0010 pot. non null
0011 pot. nn & pot. un
0100 pot. null
0101 pot. n & pot. un
0110 pot. n & pot. nn
0111 pot. n & pot. nn & pot. un
1001 def. unknown
1010 def. non null
1011 pot. nn & prot. nn
1100 def. null
1101 pot. n & prot. n
1110 prot. null
1111 prot. non null
*/
// extra segments
public static final int extraLength = 6;
public long extra[][];
// extra bit fields for larger numbers of fields/variables
// extra[0] holds definiteInits values, extra[1] potentialInits, etc.
// lifecycle is extra == null or else all extra[]'s are allocated
// arrays which have the same size
public int maxFieldCount; // limit between fields and locals
// Constants
public static final int BitCacheSize = 64; // 64 bits in a long.
/* fakeInitializedFlowInfo: For Lambda expressions tentative analysis during overload resolution.
We presume that any and all outer locals touched by the lambda are definitely assigned and
effectively final. Whether they are or not is immaterial for overload analysis (errors encountered
in the body are not supposed to influence the resolution. It is pertinent only for the eventual
resolution/analysis post overload resolution. For lambda's the problem is that we start the control/data
flow analysis abruptly at the start of the lambda, so we need to present a cogent world view and hence
all this charade.
*/
public static UnconditionalFlowInfo fakeInitializedFlowInfo(int localsCount, int maxFieldCount) {
UnconditionalFlowInfo flowInfo = new UnconditionalFlowInfo();
flowInfo.maxFieldCount = maxFieldCount;
for (int i = 0; i < localsCount; i++)
flowInfo.markAsDefinitelyAssigned(i + maxFieldCount);
return flowInfo;
}
public FlowInfo addInitializationsFrom(FlowInfo inits) {
return addInfoFrom(inits, true);
}
public FlowInfo addNullInfoFrom(FlowInfo inits) {
return addInfoFrom(inits, false);
}
private FlowInfo addInfoFrom(FlowInfo inits, boolean handleInits) {
if (this == DEAD_END)
return this;
if (inits == DEAD_END)
return this;
UnconditionalFlowInfo otherInits = inits.unconditionalInits();
if (handleInits) {
// union of definitely assigned variables,
this.definiteInits |= otherInits.definiteInits;
// union of potentially set ones
this.potentialInits |= otherInits.potentialInits;
}
// combine null information
boolean thisHadNulls = (this.tagBits & NULL_FLAG_MASK) != 0,
otherHasNulls = (otherInits.tagBits & NULL_FLAG_MASK) != 0;
long
a1, a2, a3, a4,
na1, na2, na3, na4,
b1, b2, b3, b4,
nb1, nb2, nb3, nb4;
if (otherHasNulls) {
if (!thisHadNulls) {
this.nullBit1 = otherInits.nullBit1;
this.nullBit2 = otherInits.nullBit2;
this.nullBit3 = otherInits.nullBit3;
this.nullBit4 = otherInits.nullBit4;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 1) {
this.nullBit4 = ~0;
}
}
}
else {
this.nullBit1 = (b1 = otherInits.nullBit1)
| (a1 = this.nullBit1) & ((a3 = this.nullBit3)
& (a4 = this.nullBit4) & (nb2 = ~(b2 = otherInits.nullBit2))
& (nb4 = ~(b4 = otherInits.nullBit4))
| ((na4 = ~a4) | (na3 = ~a3))
& ((na2 = ~(a2 = this.nullBit2)) & nb2
| a2 & (nb3 = ~(b3 = otherInits.nullBit3)) & nb4));
this.nullBit2 = b2 & (nb4 | nb3)
| na3 & na4 & b2
| a2 & (nb3 & nb4
| (nb1 = ~b1) & (na3 | (na1 = ~a1))
| a1 & b2);
this.nullBit3 = b3 & (nb1 & (b2 | a2 | na1)
| b1 & (b4 | nb2 | a1 & a3)
| na1 & na2 & na4)
| a3 & nb2 & nb4
| nb1 & ((na2 & a4 | na1) & a3
| a1 & na2 & na4 & b2);
this.nullBit4 = nb1 & (a4 & (na3 & nb3 | (a3 | na2) & nb2)
| a1 & (a3 & nb2 & b4
| a2 & b2 & (b4 | a3 & na4 & nb3)))
| b1 & (a3 & a4 & b4
| na2 & na4 & nb3 & b4
| a2 & ((b3 | a4) & b4
| na3 & a4 & b2 & b3)
| na1 & (b4 | (a4 | a2) & b2 & b3))
| (na1 & (na3 & nb3 | na2 & nb2)
| a1 & (nb2 & nb3 | a2 & a3)) & b4;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 2) {
this.nullBit4 = ~0;
}
}
}
this.tagBits |= NULL_FLAG_MASK; // in all cases - avoid forgetting extras
}
// treating extra storage
if (this.extra != null || otherInits.extra != null) {
int mergeLimit = 0, copyLimit = 0;
if (this.extra != null) {
if (otherInits.extra != null) {
// both sides have extra storage
int length, otherLength;
if ((length = this.extra[0].length) <
(otherLength = otherInits.extra[0].length)) {
// current storage is shorter -> grow current
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[otherLength]), 0, length);
}
mergeLimit = length;
copyLimit = otherLength;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 3) {
throw new AssertionFailedException("COVERAGE 3"); //$NON-NLS-1$
}
}
} else {
// current storage is longer
mergeLimit = otherLength;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 4) {
throw new AssertionFailedException("COVERAGE 4"); //$NON-NLS-1$
}
}
}
}
} else if (otherInits.extra != null) {
// no storage here, but other has extra storage.
// shortcut regular copy because array copy is better
int otherLength;
this.extra = new long[extraLength][];
System.arraycopy(otherInits.extra[0], 0,
(this.extra[0] = new long[otherLength =
otherInits.extra[0].length]), 0, otherLength);
System.arraycopy(otherInits.extra[1], 0,
(this.extra[1] = new long[otherLength]), 0, otherLength);
if (otherHasNulls) {
for (int j = 2; j < extraLength; j++) {
System.arraycopy(otherInits.extra[j], 0,
(this.extra[j] = new long[otherLength]), 0, otherLength);
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 5) {
this.extra[5][otherLength - 1] = ~0;
}
}
}
else {
for (int j = 2; j < extraLength; j++) {
this.extra[j] = new long[otherLength];
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 6) {
throw new AssertionFailedException("COVERAGE 6"); //$NON-NLS-1$
}
}
}
}
int i;
if (handleInits) {
// manage definite assignment info
for (i = 0; i < mergeLimit; i++) {
this.extra[0][i] |= otherInits.extra[0][i];
this.extra[1][i] |= otherInits.extra[1][i];
}
for (; i < copyLimit; i++) {
this.extra[0][i] = otherInits.extra[0][i];
this.extra[1][i] = otherInits.extra[1][i];
}
}
// tweak limits for nulls
if (!thisHadNulls) {
if (copyLimit < mergeLimit) {
copyLimit = mergeLimit;
}
mergeLimit = 0;
}
if (!otherHasNulls) {
copyLimit = 0;
mergeLimit = 0;
}
for (i = 0; i < mergeLimit; i++) {
this.extra[1 + 1][i] = (b1 = otherInits.extra[1 + 1][i])
| (a1 = this.extra[1 + 1][i]) & ((a3 = this.extra[3 + 1][i])
& (a4 = this.extra[4 + 1][i]) & (nb2 = ~(b2 = otherInits.extra[2 + 1][i]))
& (nb4 = ~(b4 = otherInits.extra[4 + 1][i]))
| ((na4 = ~a4) | (na3 = ~a3))
& ((na2 = ~(a2 = this.extra[2 + 1][i])) & nb2
| a2 & (nb3 = ~(b3 = otherInits.extra[3 + 1][i])) & nb4));
this.extra[2 + 1][i] = b2 & (nb4 | nb3)
| na3 & na4 & b2
| a2 & (nb3 & nb4
| (nb1 = ~b1) & (na3 | (na1 = ~a1))
| a1 & b2);
this.extra[3 + 1][i] = b3 & (nb1 & (b2 | a2 | na1)
| b1 & (b4 | nb2 | a1 & a3)
| na1 & na2 & na4)
| a3 & nb2 & nb4
| nb1 & ((na2 & a4 | na1) & a3
| a1 & na2 & na4 & b2);
this.extra[4 + 1][i] = nb1 & (a4 & (na3 & nb3 | (a3 | na2) & nb2)
| a1 & (a3 & nb2 & b4
| a2 & b2 & (b4 | a3 & na4 & nb3)))
| b1 & (a3 & a4 & b4
| na2 & na4 & nb3 & b4
| a2 & ((b3 | a4) & b4
| na3 & a4 & b2 & b3)
| na1 & (b4 | (a4 | a2) & b2 & b3))
| (na1 & (na3 & nb3 | na2 & nb2)
| a1 & (nb2 & nb3 | a2 & a3)) & b4;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 7) {
this.extra[5][i] = ~0;
}
}
}
for (; i < copyLimit; i++) {
for (int j = 2; j < extraLength; j++) {
this.extra[j][i] = otherInits.extra[j][i];
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 8) {
this.extra[5][i] = ~0;
}
}
}
}
return this;
}
public FlowInfo addPotentialInitializationsFrom(FlowInfo inits) {
if (this == DEAD_END){
return this;
}
if (inits == DEAD_END){
return this;
}
UnconditionalFlowInfo otherInits = inits.unconditionalInits();
// union of potentially set ones
this.potentialInits |= otherInits.potentialInits;
// treating extra storage
if (this.extra != null) {
if (otherInits.extra != null) {
// both sides have extra storage
int i = 0, length, otherLength;
if ((length = this.extra[0].length) < (otherLength = otherInits.extra[0].length)) {
// current storage is shorter -> grow current
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[otherLength]), 0, length);
}
for (; i < length; i++) {
this.extra[1][i] |= otherInits.extra[1][i];
}
for (; i < otherLength; i++) {
this.extra[1][i] = otherInits.extra[1][i];
}
}
else {
// current storage is longer
for (; i < otherLength; i++) {
this.extra[1][i] |= otherInits.extra[1][i];
}
}
}
}
else if (otherInits.extra != null) {
// no storage here, but other has extra storage.
int otherLength = otherInits.extra[0].length;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[otherLength];
}
System.arraycopy(otherInits.extra[1], 0, this.extra[1], 0,
otherLength);
}
addPotentialNullInfoFrom(otherInits);
return this;
}
/**
* Compose other inits over this flow info, then return this. The operation
* semantics are to wave into this flow info the consequences upon null
* information of a possible path into the operations that resulted into
* otherInits. The fact that this path may be left unexecuted under peculiar
* conditions results into less specific results than
* {@link #addInitializationsFrom(FlowInfo) addInitializationsFrom}; moreover,
* only the null information is affected.
* @param otherInits other null inits to compose over this
* @return this, modified according to otherInits information
*/
public UnconditionalFlowInfo addPotentialNullInfoFrom(
UnconditionalFlowInfo otherInits) {
if ((this.tagBits & UNREACHABLE) != 0 ||
(otherInits.tagBits & UNREACHABLE) != 0 ||
(otherInits.tagBits & NULL_FLAG_MASK) == 0) {
return this;
}
// if we get here, otherInits has some null info
boolean thisHadNulls = (this.tagBits & NULL_FLAG_MASK) != 0,
thisHasNulls = false;
long a1, a2, a3, a4,
na1, na2, na3, na4,
b1, b2, b3, b4,
nb1, nb2, nb3, nb4;
if (thisHadNulls) {
this.nullBit1 = (a1 = this.nullBit1)
& ((a3 = this.nullBit3) & (a4 = this.nullBit4)
& ((nb2 = ~(b2 = otherInits.nullBit2))
& (nb4 = ~(b4 = otherInits.nullBit4))
| (b1 = otherInits.nullBit1) & (b3 = otherInits.nullBit3))
| (na2 = ~(a2 = this.nullBit2))
& (b1 & b3 | ((na4 = ~a4) | (na3 = ~a3)) & nb2)
| a2 & ((na4 | na3) & ((nb3 = ~b3) & nb4 | b1 & b2)));
this.nullBit2 = b2 & (nb3 | (nb1 = ~b1))
| a2 & (nb3 & nb4 | b2 | na3 | (na1 = ~a1));
this.nullBit3 = b3 & (nb1 & b2
| a2 & (nb2 | a3)
| na1 & nb2
| a1 & na2 & na4 & b1)
| a3 & (nb2 & nb4 | na2 & a4 | na1)
| a1 & na2 & na4 & b2;
this.nullBit4 = na3 & (nb1 & nb3 & b4
| a4 & (nb3 | b1 & b2))
| nb2 & (na3 & b1 & nb3 | na2 & (nb1 & b4 | b1 & nb3 | a4))
| a3 & (a4 & (nb2 | b1 & b3)
| a1 & a2 & (nb1 & b4 | na4 & (b2 | b1) & nb3));
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 9) {
this.nullBit4 = ~0;
}
}
if ((this.nullBit2 | this.nullBit3 | this.nullBit4) != 0) { // bit1 is redundant
thisHasNulls = true;
}
} else {
this.nullBit1 = 0;
this.nullBit2 = (b2 = otherInits.nullBit2)
& ((nb3 = ~(b3 = otherInits.nullBit3)) |
(nb1 = ~(b1 = otherInits.nullBit1)));
this.nullBit3 = b3 & (nb1 | (nb2 = ~b2));
this.nullBit4 = ~b1 & ~b3 & (b4 = otherInits.nullBit4) | ~b2 & (b1 & ~b3 | ~b1 & b4);
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 10) {
this.nullBit4 = ~0;
}
}
if ((this.nullBit2 | this.nullBit3 | this.nullBit4) != 0) { // bit1 is redundant
thisHasNulls = true;
}
}
// extra storage management
if (otherInits.extra != null) {
int mergeLimit = 0, copyLimit = otherInits.extra[0].length;
if (this.extra == null) {
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[copyLimit];
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 11) {
throw new AssertionFailedException("COVERAGE 11"); //$NON-NLS-1$
}
}
} else {
mergeLimit = copyLimit;
if (mergeLimit > this.extra[0].length) {
mergeLimit = this.extra[0].length;
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
this.extra[j] = new long[copyLimit], 0,
mergeLimit);
}
if (! thisHadNulls) {
mergeLimit = 0;
// will do with a copy -- caveat: only valid because definite assignment bits copied above
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 12) {
throw new AssertionFailedException("COVERAGE 12"); //$NON-NLS-1$
}
}
}
}
}
// PREMATURE skip operations for fields
int i;
for (i = 0 ; i < mergeLimit ; i++) {
this.extra[1 + 1][i] = (a1 = this.extra[1 + 1][i])
& ((a3 = this.extra[3 + 1][i]) & (a4 = this.extra[4 + 1][i])
& ((nb2 = ~(b2 = otherInits.extra[2 + 1][i]))
& (nb4 = ~(b4 = otherInits.extra[4 + 1][i]))
| (b1 = otherInits.extra[1 + 1][i]) & (b3 = otherInits.extra[3 + 1][i]))
| (na2 = ~(a2 = this.extra[2 + 1][i]))
& (b1 & b3 | ((na4 = ~a4) | (na3 = ~a3)) & nb2)
| a2 & ((na4 | na3) & ((nb3 = ~b3) & nb4 | b1 & b2)));
this.extra[2 + 1][i] = b2 & (nb3 | (nb1 = ~b1))
| a2 & (nb3 & nb4 | b2 | na3 | (na1 = ~a1));
this.extra[3 + 1][i] = b3 & (nb1 & b2
| a2 & (nb2 | a3)
| na1 & nb2
| a1 & na2 & na4 & b1)
| a3 & (nb2 & nb4 | na2 & a4 | na1)
| a1 & na2 & na4 & b2;
this.extra[4 + 1][i] = na3 & (nb1 & nb3 & b4
| a4 & (nb3 | b1 & b2))
| nb2 & (na3 & b1 & nb3 | na2 & (nb1 & b4 | b1 & nb3 | a4))
| a3 & (a4 & (nb2 | b1 & b3)
| a1 & a2 & (nb1 & b4 | na4 & (b2 | b1) & nb3));
if ((this.extra[2 + 1][i] | this.extra[3 + 1][i] | this.extra[4 + 1][i]) != 0) { // bit1 is redundant
thisHasNulls = true;
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 13) {
this.nullBit4 = ~0;
}
}
}
for (; i < copyLimit; i++) {
this.extra[1 + 1][i] = 0;
this.extra[2 + 1][i] = (b2 = otherInits.extra[2 + 1][i])
& ((nb3 = ~(b3 = otherInits.extra[3 + 1][i])) |
(nb1 = ~(b1 = otherInits.extra[1 + 1][i])));
this.extra[3 + 1][i] = b3 & (nb1 | (nb2 = ~b2));
this.extra[4 + 1][i] = ~b1 & ~b3 & (b4 = otherInits.extra[4 + 1][i]) | ~b2 & (b1 & ~b3 | ~b1 & b4);
if ((this.extra[2 + 1][i] | this.extra[3 + 1][i] | this.extra[4 + 1][i]) != 0) { // bit1 is redundant
thisHasNulls = true;
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 14) {
this.extra[5][i] = ~0;
}
}
}
}
if (thisHasNulls) {
this.tagBits |= NULL_FLAG_MASK;
}
else {
this.tagBits &= NULL_FLAG_MASK;
}
return this;
}
final public boolean cannotBeDefinitelyNullOrNonNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return (
(~this.nullBit1
& (this.nullBit2 & this.nullBit3 | this.nullBit4)
| ~this.nullBit2 & ~this.nullBit3 & this.nullBit4)
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
long a2, a3, a4;
return (
(~this.extra[2][vectorIndex]
& ((a2 = this.extra[3][vectorIndex]) & (a3 = this.extra[4][vectorIndex]) | (a4 = this.extra[5][vectorIndex]))
| ~a2 & ~a3 & a4)
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean cannotBeNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return (this.nullBit1 & this.nullBit3
& ((this.nullBit2 & this.nullBit4) | ~this.nullBit2)
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return (this.extra[2][vectorIndex] & this.extra[4][vectorIndex]
& ((this.extra[3][vectorIndex] & this.extra[5][vectorIndex]) |
~this.extra[3][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean canOnlyBeNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return (this.nullBit1 & this.nullBit2
& (~this.nullBit3 | ~this.nullBit4)
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return (this.extra[2][vectorIndex] & this.extra[3][vectorIndex]
& (~this.extra[4][vectorIndex] | ~this.extra[5][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
public FlowInfo copy() {
// do not clone the DeadEnd
if (this == DEAD_END) {
return this;
}
UnconditionalFlowInfo copy = new UnconditionalFlowInfo();
// copy slots
copy.definiteInits = this.definiteInits;
copy.potentialInits = this.potentialInits;
boolean hasNullInfo = (this.tagBits & NULL_FLAG_MASK) != 0;
if (hasNullInfo) {
copy.nullBit1 = this.nullBit1;
copy.nullBit2 = this.nullBit2;
copy.nullBit3 = this.nullBit3;
copy.nullBit4 = this.nullBit4;
}
copy.tagBits = this.tagBits;
copy.maxFieldCount = this.maxFieldCount;
if (this.extra != null) {
int length;
copy.extra = new long[extraLength][];
System.arraycopy(this.extra[0], 0,
(copy.extra[0] = new long[length = this.extra[0].length]), 0,
length);
System.arraycopy(this.extra[1], 0,
(copy.extra[1] = new long[length]), 0, length);
if (hasNullInfo) {
for (int j = 2; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(copy.extra[j] = new long[length]), 0, length);
}
}
else {
for (int j = 2; j < extraLength; j++) {
copy.extra[j] = new long[length];
}
}
}
return copy;
}
/**
* Discard definite inits and potential inits from this, then return this.
* The returned flow info only holds null related information.
* @return this flow info, minus definite inits and potential inits
*/
public UnconditionalFlowInfo discardInitializationInfo() {
if (this == DEAD_END) {
return this;
}
this.definiteInits =
this.potentialInits = 0;
if (this.extra != null) {
for (int i = 0, length = this.extra[0].length; i < length; i++) {
this.extra[0][i] = this.extra[1][i] = 0;
}
}
return this;
}
/**
* Remove local variables information from this flow info and return this.
* @return this, deprived from any local variable information
*/
public UnconditionalFlowInfo discardNonFieldInitializations() {
int limit = this.maxFieldCount;
if (limit < BitCacheSize) {
long mask = (1L << limit)-1;
this.definiteInits &= mask;
this.potentialInits &= mask;
this.nullBit1 &= mask;
this.nullBit2 &= mask;
this.nullBit3 &= mask;
this.nullBit4 &= mask;
}
// use extra vector
if (this.extra == null) {
return this; // if vector not yet allocated, then not initialized
}
int vectorIndex, length = this.extra[0].length;
if ((vectorIndex = (limit / BitCacheSize) - 1) >= length) {
return this; // not enough room yet
}
if (vectorIndex >= 0) {
// else we only have complete non field array items left
long mask = (1L << (limit % BitCacheSize))-1;
for (int j = 0; j < extraLength; j++) {
this.extra[j][vectorIndex] &= mask;
}
}
for (int i = vectorIndex + 1; i < length; i++) {
for (int j = 0; j < extraLength; j++) {
this.extra[j][i] = 0;
}
}
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) {
if (position < BitCacheSize) {
// use bits
return (this.definiteInits & (1L << position)) != 0;
}
// use extra vector
if (this.extra == null)
return false; // if vector not yet allocated, then not initialized
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1)
>= this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[0][vectorIndex]) &
(1L << (position % BitCacheSize))) != 0;
}
final public boolean isDefinitelyAssigned(FieldBinding field) {
// Mirrored in CodeStream.isDefinitelyAssigned(..)
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE_OR_DEAD) != 0) {
return true;
}
return isDefinitelyAssigned(field.id);
}
final public boolean isDefinitelyAssigned(LocalVariableBinding local) {
// do not want to complain in unreachable code if local declared in reachable code
if ((this.tagBits & UNREACHABLE_OR_DEAD) != 0 && (local.declaration.bits & ASTNode.IsLocalDeclarationReachable) != 0) {
return true;
}
return isDefinitelyAssigned(local.id + this.maxFieldCount);
}
final public boolean isDefinitelyNonNull(LocalVariableBinding local) {
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE) != 0 ||
(this.tagBits & NULL_FLAG_MASK) == 0) {
return false;
}
if ((local.type.tagBits & TagBits.IsBaseType) != 0 ||
local.constant() != Constant.NotAConstant) { // String instances
return true;
}
int position = local.id + this.maxFieldCount;
if (position < BitCacheSize) { // use bits
return ((this.nullBit1 & this.nullBit3 & (~this.nullBit2 | this.nullBit4))
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1)
>= this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[2][vectorIndex] & this.extra[4][vectorIndex]
& (~this.extra[3][vectorIndex] | this.extra[5][vectorIndex]))
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean isDefinitelyNull(LocalVariableBinding local) {
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE) != 0 ||
(this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position = local.id + this.maxFieldCount;
if (position < BitCacheSize) { // use bits
return ((this.nullBit1 & this.nullBit2
& (~this.nullBit3 | ~this.nullBit4))
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[2][vectorIndex] & this.extra[3][vectorIndex]
& (~this.extra[4][vectorIndex] | ~this.extra[5][vectorIndex]))
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean isDefinitelyUnknown(LocalVariableBinding local) {
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE) != 0 ||
(this.tagBits & NULL_FLAG_MASK) == 0) {
return false;
}
int position = local.id + this.maxFieldCount;
if (position < BitCacheSize) { // use bits
return ((this.nullBit1 & this.nullBit4
& ~this.nullBit2 & ~this.nullBit3) & (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[2][vectorIndex] & this.extra[5][vectorIndex]
& ~this.extra[3][vectorIndex] & ~this.extra[4][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean hasNullInfoFor(LocalVariableBinding local) {
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE) != 0 ||
(this.tagBits & NULL_FLAG_MASK) == 0) {
return false;
}
int position = local.id + this.maxFieldCount;
if (position < BitCacheSize) { // use bits
return ((this.nullBit1 | this.nullBit2
| this.nullBit3 | this.nullBit4) & (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[2][vectorIndex] | this.extra[3][vectorIndex]
| this.extra[4][vectorIndex] | this.extra[5][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
/**
* Check status of potential assignment at a given position.
*/
final private boolean isPotentiallyAssigned(int position) {
// id is zero-based
if (position < BitCacheSize) {
// use bits
return (this.potentialInits & (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1)
>= this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[1][vectorIndex]) &
(1L << (position % BitCacheSize))) != 0;
}
final public boolean isPotentiallyAssigned(FieldBinding field) {
return isPotentiallyAssigned(field.id);
}
final public boolean isPotentiallyAssigned(LocalVariableBinding local) {
// final constants are inlined, and thus considered as always initialized
if (local.constant() != Constant.NotAConstant) {
return true;
}
return isPotentiallyAssigned(local.id + this.maxFieldCount);
}
// TODO (Ayush) Check why this method does not return true for protected non null (1111)
final public boolean isPotentiallyNonNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return ((this.nullBit3 & (~this.nullBit1 | ~this.nullBit2))
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[4][vectorIndex]
& (~this.extra[2][vectorIndex] | ~this.extra[3][vectorIndex]))
& (1L << (position % BitCacheSize))) != 0;
}
// TODO (Ayush) Check why this method does not return true for protected null
final public boolean isPotentiallyNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return ((this.nullBit2 & (~this.nullBit1 | ~this.nullBit3))
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return ((this.extra[3][vectorIndex]
& (~this.extra[2][vectorIndex] | ~this.extra[4][vectorIndex]))
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean isPotentiallyUnknown(LocalVariableBinding local) {
// do not want to complain in unreachable code
if ((this.tagBits & UNREACHABLE) != 0 ||
(this.tagBits & NULL_FLAG_MASK) == 0) {
return false;
}
int position = local.id + this.maxFieldCount;
if (position < BitCacheSize) { // use bits
return (this.nullBit4
& (~this.nullBit1 | ~this.nullBit2 & ~this.nullBit3)
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[2].length) {
return false; // if not enough room in vector, then not initialized
}
return (this.extra[5][vectorIndex]
& (~this.extra[2][vectorIndex]
| ~this.extra[3][vectorIndex] & ~this.extra[4][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean isProtectedNonNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return (this.nullBit1 & this.nullBit3 & this.nullBit4 & (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return (this.extra[2][vectorIndex]
& this.extra[4][vectorIndex]
& this.extra[5][vectorIndex]
& (1L << (position % BitCacheSize))) != 0;
}
final public boolean isProtectedNull(LocalVariableBinding local) {
if ((this.tagBits & NULL_FLAG_MASK) == 0 ||
(local.type.tagBits & TagBits.IsBaseType) != 0) {
return false;
}
int position;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
return (this.nullBit1 & this.nullBit2
& (this.nullBit3 ^ this.nullBit4)
& (1L << position)) != 0;
}
// use extra vector
if (this.extra == null) {
return false; // if vector not yet allocated, then not initialized
}
int vectorIndex;
if ((vectorIndex = (position / BitCacheSize) - 1) >=
this.extra[0].length) {
return false; // if not enough room in vector, then not initialized
}
return (this.extra[2][vectorIndex] & this.extra[3][vectorIndex]
& (this.extra[4][vectorIndex] ^ this.extra[5][vectorIndex])
& (1L << (position % BitCacheSize))) != 0;
}
/** Asserts that the given boolean is <code>true</code>. If this
* is not the case, some kind of unchecked exception is thrown.
* The given message is included in that exception, to aid debugging.
*
* @param expression the outcome of the check
* @param message the message to include in the exception
* @return <code>true</code> if the check passes (does not return
* if the check fails)
*/
protected static boolean isTrue(boolean expression, String message) {
if (!expression)
throw new AssertionFailedException("assertion failed: " + message); //$NON-NLS-1$
return expression;
}
public void markAsComparedEqualToNonNull(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
long a1, a2, a3, a4, na2;
// position is zero-based
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
if (((mask = 1L << position)
& (a1 = this.nullBit1)
& (na2 = ~(a2 = this.nullBit2))
& ~(a3 = this.nullBit3)
& (a4 = this.nullBit4))
!= 0) {
this.nullBit4 &= ~mask;
} else if ((mask & a1 & na2 & a3) == 0) {
this.nullBit4 |= mask;
if ((mask & a1) == 0) {
if ((mask & a2 & (a3 ^ a4)) != 0) {
this.nullBit2 &= ~mask;
}
else if ((mask & (a2 | a3 | a4)) == 0) {
this.nullBit2 |= mask;
}
}
}
this.nullBit1 |= mask;
this.nullBit3 |= mask;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 15) {
this.nullBit4 = ~0;
}
}
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 16) {
throw new AssertionFailedException("COVERAGE 16"); //$NON-NLS-1$
}
}
}
else {
int oldLength;
if (vectorIndex >= (oldLength = this.extra[0].length)) {
int newLength = vectorIndex + 1;
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[newLength]), 0,
oldLength);
}
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 17) {
throw new AssertionFailedException("COVERAGE 17"); //$NON-NLS-1$
}
}
}
}
// MACRO :'b,'es/nullBit\(.\)/extra[\1 + 1][vectorIndex]/gc
if (((mask = 1L << (position % BitCacheSize))
& (a1 = this.extra[1 + 1][vectorIndex])
& (na2 = ~(a2 = this.extra[2 + 1][vectorIndex]))
& ~(a3 = this.extra[3 + 1][vectorIndex])
& (a4 = this.extra[4 + 1][vectorIndex]))
!= 0) {
this.extra[4 + 1][vectorIndex] &= ~mask;
} else if ((mask & a1 & na2 & a3) == 0) {
this.extra[4 + 1][vectorIndex] |= mask;
if ((mask & a1) == 0) {
if ((mask & a2 & (a3 ^ a4)) != 0) {
this.extra[2 + 1][vectorIndex] &= ~mask;
}
else if ((mask & (a2 | a3 | a4)) == 0) {
this.extra[2 + 1][vectorIndex] |= mask;
}
}
}
this.extra[1 + 1][vectorIndex] |= mask;
this.extra[3 + 1][vectorIndex] |= mask;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 18) {
this.extra[5][vectorIndex] = ~0;
}
}
}
}
}
public void markAsComparedEqualToNull(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
// position is zero-based
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
if (((mask = 1L << position) & this.nullBit1) != 0) {
if ((mask
& (~this.nullBit2 | this.nullBit3
| ~this.nullBit4)) != 0) {
this.nullBit4 &= ~mask;
}
} else if ((mask & this.nullBit4) != 0) {
this.nullBit3 &= ~mask;
} else {
if ((mask & this.nullBit2) != 0) {
this.nullBit3 &= ~mask;
this.nullBit4 |= mask;
} else {
this.nullBit3 |= mask;
}
}
this.nullBit1 |= mask;
this.nullBit2 |= mask;
if (COVERAGE_TEST_FLAG) {
if (CoverageTestId == 19) {
this.nullBit4 = ~0;
}
}
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
mask = 1L << (position % BitCacheSize);
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length ];
}
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 20) {
throw new AssertionFailedException("COVERAGE 20"); //$NON-NLS-1$
}
}
}
else {
int oldLength;
if (vectorIndex >= (oldLength = this.extra[0].length)) {
int newLength = vectorIndex + 1;
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[newLength]), 0,
oldLength);
}
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 21) {
throw new AssertionFailedException("COVERAGE 21"); //$NON-NLS-1$
}
}
}
}
if ((mask & this.extra[1 + 1][vectorIndex]) != 0) {
if ((mask
& (~this.extra[2 + 1][vectorIndex] | this.extra[3 + 1][vectorIndex]
| ~this.extra[4 + 1][vectorIndex])) != 0) {
this.extra[4 + 1][vectorIndex] &= ~mask;
}
} else if ((mask & this.extra[4 + 1][vectorIndex]) != 0) {
this.extra[3 + 1][vectorIndex] &= ~mask;
} else {
if ((mask & this.extra[2 + 1][vectorIndex]) != 0) {
this.extra[3 + 1][vectorIndex] &= ~mask;
this.extra[4 + 1][vectorIndex] |= mask;
} else {
this.extra[3 + 1][vectorIndex] |= mask;
}
}
this.extra[1 + 1][vectorIndex] |= mask;
this.extra[2 + 1][vectorIndex] |= mask;
}
}
}
/**
* Record a definite assignment at a given position.
*/
final private void markAsDefinitelyAssigned(int position) {
if (this != DEAD_END) {
// position is zero-based
if (position < BitCacheSize) {
// use bits
long mask;
this.definiteInits |= (mask = 1L << position);
this.potentialInits |= mask;
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
long mask;
this.extra[0][vectorIndex] |=
(mask = 1L << (position % BitCacheSize));
this.extra[1][vectorIndex] |= mask;
}
}
}
public void markAsDefinitelyAssigned(FieldBinding field) {
if (this != DEAD_END)
markAsDefinitelyAssigned(field.id);
}
public void markAsDefinitelyAssigned(LocalVariableBinding local) {
if (this != DEAD_END)
markAsDefinitelyAssigned(local.id + this.maxFieldCount);
}
public void markAsDefinitelyNonNull(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
long mask;
int position;
// position is zero-based
if ((position = local.id + this.maxFieldCount) < BitCacheSize) { // use bits
// set assigned non null
this.nullBit1 |= (mask = 1L << position);
this.nullBit3 |= mask;
// clear others
this.nullBit2 &= (mask = ~mask);
this.nullBit4 &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 22) {
this.nullBit1 = 0;
}
}
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
this.extra[2][vectorIndex]
|= (mask = 1L << (position % BitCacheSize));
this.extra[4][vectorIndex] |= mask;
this.extra[3][vectorIndex] &= (mask = ~mask);
this.extra[5][vectorIndex] &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 23) {
this.extra[2][vectorIndex] = 0;
}
}
}
}
}
public void markAsDefinitelyNull(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
long mask;
int position;
// position is zero-based
if ((position = local.id + this.maxFieldCount) < BitCacheSize) { // use bits
// mark assigned null
this.nullBit1 |= (mask = 1L << position);
this.nullBit2 |= mask;
// clear others
this.nullBit3 &= (mask = ~mask);
this.nullBit4 &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 24) {
this.nullBit4 = ~0;
}
}
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
this.extra[2][vectorIndex]
|= (mask = 1L << (position % BitCacheSize));
this.extra[3][vectorIndex] |= mask;
this.extra[4][vectorIndex] &= (mask = ~mask);
this.extra[5][vectorIndex] &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 25) {
this.extra[5][vectorIndex] = ~0;
}
}
}
}
}
/**
* Mark a local as having been assigned to an unknown value.
* @param local the local to mark
*/
// PREMATURE may try to get closer to markAsDefinitelyAssigned, but not
// obvious
public void markAsDefinitelyUnknown(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
long mask;
int position;
// position is zero-based
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
// mark assigned null
this.nullBit1 |= (mask = 1L << position);
this.nullBit4 |= mask;
// clear others
this.nullBit2 &= (mask = ~mask);
this.nullBit3 &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 26) {
this.nullBit4 = 0;
}
}
}
else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
this.extra[2][vectorIndex]
|= (mask = 1L << (position % BitCacheSize));
this.extra[5][vectorIndex] |= mask;
this.extra[3][vectorIndex] &= (mask = ~mask);
this.extra[4][vectorIndex] &= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 27) {
this.extra[5][vectorIndex] = 0;
}
}
}
}
}
public void resetNullInfo(LocalVariableBinding local) {
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
this.nullBit1 &= (mask = ~(1L << position));
this.nullBit2 &= mask;
this.nullBit3 &= mask;
this.nullBit4 &= mask;
} else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null || vectorIndex >= this.extra[2].length) {
// in case we attempt to reset the null info of a variable that has not been encountered
// before and for which no null bits exist.
return;
}
this.extra[2][vectorIndex]
&= (mask = ~(1L << (position % BitCacheSize)));
this.extra[3][vectorIndex] &= mask;
this.extra[4][vectorIndex] &= mask;
this.extra[5][vectorIndex] &= mask;
}
}
}
/**
* Mark a local as potentially having been assigned to an unknown value.
* @param local the local to mark
*/
public void markPotentiallyUnknownBit(LocalVariableBinding local) {
// protected from non-object locals in calling methods
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
mask = 1L << position;
isTrue((this.nullBit1 & mask) == 0, "Adding 'unknown' mark in unexpected state"); //$NON-NLS-1$
this.nullBit4 |= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 44) {
this.nullBit4 = 0;
}
}
} else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
mask = 1L << (position % BitCacheSize);
isTrue((this.extra[2][vectorIndex] & mask) == 0, "Adding 'unknown' mark in unexpected state"); //$NON-NLS-1$
this.extra[5][vectorIndex] |= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 45) {
this.extra[2][vectorIndex] = ~0;
this.extra[3][vectorIndex] = ~0;
this.extra[4][vectorIndex] = 0;
this.extra[5][vectorIndex] = 0;
}
}
}
}
}
public void markPotentiallyNullBit(LocalVariableBinding local) {
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
mask = 1L << position;
isTrue((this.nullBit1 & mask) == 0, "Adding 'potentially null' mark in unexpected state"); //$NON-NLS-1$
this.nullBit2 |= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 40) {
this.nullBit2 = 0;
}
}
} else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
mask = 1L << (position % BitCacheSize);
this.extra[3][vectorIndex] |= mask;
isTrue((this.extra[2][vectorIndex] & mask) == 0, "Adding 'potentially null' mark in unexpected state"); //$NON-NLS-1$
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 41) {
this.extra[3][vectorIndex] = 0;
}
}
}
}
}
public void markPotentiallyNonNullBit(LocalVariableBinding local) {
if (this != DEAD_END) {
this.tagBits |= NULL_FLAG_MASK;
int position;
long mask;
if ((position = local.id + this.maxFieldCount) < BitCacheSize) {
// use bits
mask = 1L << position;
isTrue((this.nullBit1 & mask) == 0, "Adding 'potentially non-null' mark in unexpected state"); //$NON-NLS-1$
this.nullBit3 |= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 42) {
this.nullBit1 = ~0;
this.nullBit2 = 0;
this.nullBit3 = ~0;
this.nullBit4 = 0;
}
}
} else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null) {
int length = vectorIndex + 1;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[length];
}
}
else {
int oldLength; // might need to grow the arrays
if (vectorIndex >= (oldLength = this.extra[0].length)) {
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[vectorIndex + 1]), 0,
oldLength);
}
}
}
mask = 1L << (position % BitCacheSize);
isTrue((this.extra[2][vectorIndex] & mask) == 0, "Adding 'potentially non-null' mark in unexpected state"); //$NON-NLS-1$
this.extra[4][vectorIndex] |= mask;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 43) {
this.extra[2][vectorIndex] = ~0;
this.extra[3][vectorIndex] = 0;
this.extra[4][vectorIndex] = ~0;
this.extra[5][vectorIndex] = 0;
}
}
}
}
}
public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits) {
if ((otherInits.tagBits & UNREACHABLE_OR_DEAD) != 0 && this != DEAD_END) {
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 28) {
throw new AssertionFailedException("COVERAGE 28"); //$NON-NLS-1$
}
}
return this;
}
if ((this.tagBits & UNREACHABLE_OR_DEAD) != 0) {
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 29) {
throw new AssertionFailedException("COVERAGE 29"); //$NON-NLS-1$
}
}
return (UnconditionalFlowInfo) otherInits.copy(); // make sure otherInits won't be affected
}
// intersection of definitely assigned variables,
this.definiteInits &= otherInits.definiteInits;
// union of potentially set ones
this.potentialInits |= otherInits.potentialInits;
// null combinations
boolean
thisHasNulls = (this.tagBits & NULL_FLAG_MASK) != 0,
otherHasNulls = (otherInits.tagBits & NULL_FLAG_MASK) != 0,
thisHadNulls = thisHasNulls;
long
a1, a2, a3, a4,
na1, na2, na3, na4,
nb1, nb2, nb3, nb4,
b1, b2, b3, b4;
if ((otherInits.tagBits & FlowInfo.UNREACHABLE_BY_NULLANALYSIS) != 0) {
otherHasNulls = false; // skip merging, otherInits is unreachable by null analysis
} else if ((this.tagBits & FlowInfo.UNREACHABLE_BY_NULLANALYSIS) != 0) { // directly copy if this is unreachable by null analysis
this.nullBit1 = otherInits.nullBit1;
this.nullBit2 = otherInits.nullBit2;
this.nullBit3 = otherInits.nullBit3;
this.nullBit4 = otherInits.nullBit4;
thisHadNulls = false;
thisHasNulls = otherHasNulls;
this.tagBits = otherInits.tagBits;
} else if (thisHadNulls) {
if (otherHasNulls) {
this.nullBit1 = (a1 = this.nullBit1) & (b1 = otherInits.nullBit1) & (
((a2 = this.nullBit2) & (((b2 = otherInits.nullBit2) &
~(((a3=this.nullBit3) & (a4=this.nullBit4)) ^ ((b3=otherInits.nullBit3) & (b4=otherInits.nullBit4))))
|(a3 & a4 & (nb2 = ~b2))))
|((na2 = ~a2) & ((b2 & b3 & b4)
|(nb2 & ((na3 = ~a3) ^ b3)))));
this.nullBit2 = b2 & ((nb3 = ~b3) | (nb1 = ~b1) | a3 & (a4 | (na1 = ~a1)) & (nb4 = ~b4))
| a2 & (b2 | (na4 = ~a4) & b3 & (b4 | nb1) | na3 | na1);
this.nullBit3 = a3 & (na1 | a1 & na2 | b3 & (na4 ^ b4))
| b3 & (nb1 | b1 & nb2);
this.nullBit4 = na3 & (nb1 & nb3 & b4
| b1 & (nb2 & nb3 | a4 & b2 & nb4)
| na1 & a4 & (nb3 | b1 & b2))
| a3 & a4 & (b3 & b4 | b1 & nb2 | na1 & a2)
| na2 & (nb1 & b4 | b1 & nb3 | na1 & a4) & nb2
| a1 & (na3 & (nb3 & b4
| b1 & b2 & b3 & nb4
| na2 & (nb3 | nb2))
| na2 & b3 & b4
| a2 & (nb1 & b4 | a3 & na4 & b1) & nb3)
|nb1 & b2 & b3 & b4;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 30) {
this.nullBit4 = ~0;
}
}
} else { // other has no null info
a1 = this.nullBit1;
this.nullBit1 = 0;
this.nullBit2 = (a2 = this.nullBit2) & (na3 = ~(a3 = this.nullBit3) | (na1 = ~a1));
this.nullBit3 = a3 & ((na2 = ~a2) & (a4 = this.nullBit4) | na1) | a1 & na2 & ~a4;
this.nullBit4 = (na3 | na2) & na1 & a4 | a1 & na3 & na2;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 31) {
this.nullBit4 = ~0;
}
}
}
} else if (otherHasNulls) { // only other had nulls
this.nullBit1 = 0;
this.nullBit2 = (b2 = otherInits.nullBit2) & (nb3 = ~(b3 = otherInits.nullBit3) | (nb1 = ~(b1 = otherInits.nullBit1)));
this.nullBit3 = b3 & ((nb2 = ~b2) & (b4 = otherInits.nullBit4) | nb1) | b1 & nb2 & ~b4;
this.nullBit4 = (nb3 | nb2) & nb1 & b4 | b1 & nb3 & nb2;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 32) {
this.nullBit4 = ~0;
}
}
thisHasNulls =
// redundant with the three following ones
this.nullBit2 != 0 ||
this.nullBit3 != 0 ||
this.nullBit4 != 0;
}
// treating extra storage
if (this.extra != null || otherInits.extra != null) {
int mergeLimit = 0, copyLimit = 0, resetLimit = 0;
int i;
if (this.extra != null) {
if (otherInits.extra != null) {
// both sides have extra storage
int length, otherLength;
if ((length = this.extra[0].length) <
(otherLength = otherInits.extra[0].length)) {
// current storage is shorter -> grow current
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], 0,
(this.extra[j] = new long[otherLength]), 0, length);
}
mergeLimit = length;
copyLimit = otherLength;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 33) {
throw new AssertionFailedException("COVERAGE 33"); //$NON-NLS-1$
}
}
}
else {
// current storage is longer
mergeLimit = otherLength;
resetLimit = length;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 34) {
throw new AssertionFailedException("COVERAGE 34"); //$NON-NLS-1$
}
}
}
}
else {
resetLimit = this.extra[0].length;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 35) {
throw new AssertionFailedException("COVERAGE 35"); //$NON-NLS-1$
}
}
}
}
else if (otherInits.extra != null) {
// no storage here, but other has extra storage.
int otherLength = otherInits.extra[0].length;
this.extra = new long[extraLength][];
for (int j = 0; j < extraLength; j++) {
this.extra[j] = new long[otherLength];
}
System.arraycopy(otherInits.extra[1], 0,
this.extra[1], 0, otherLength);
copyLimit = otherLength;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 36) {
throw new AssertionFailedException("COVERAGE 36"); //$NON-NLS-1$
}
}
}
// MACRO :'b,'es/nullBit\(.\)/extra[\1 + 1][i]/g
// manage definite assignment
for (i = 0; i < mergeLimit; i++) {
this.extra[0][i] &= otherInits.extra[0][i];
this.extra[1][i] |= otherInits.extra[1][i];
}
for (; i < copyLimit; i++) {
this.extra[1][i] = otherInits.extra[1][i];
}
for (; i < resetLimit; i++) {
this.extra[0][i] = 0;
}
// refine null bits requirements
if (!otherHasNulls) {
if (resetLimit < mergeLimit) {
resetLimit = mergeLimit;
}
copyLimit = 0; // no need to carry inexisting nulls
mergeLimit = 0;
}
if (!thisHadNulls) {
resetLimit = 0; // no need to reset anything
}
// compose nulls
for (i = 0; i < mergeLimit; i++) {
this.extra[1 + 1][i] = (a1=this.extra[1+1][i]) & (b1=otherInits.extra[1+1][i]) & (
((a2=this.extra[2+1][i]) & (((b2=otherInits.extra[2+1][i]) &
~(((a3=this.extra[3+1][i]) & (a4=this.extra[4+1][i])) ^ ((b3=otherInits.extra[3+1][i]) & (b4=otherInits.extra[4+1][i]))))
|(a3 & a4 & (nb2=~b2))))
|((na2=~a2) & ((b2 & b3 & b4)
|(nb2 & ((na3=~a3) ^ b3)))));
this.extra[2 + 1][i] = b2 & ((nb3=~b3) | (nb1 = ~b1) | a3 & (a4 | (na1 = ~a1)) & (nb4=~b4))
| a2 & (b2 | (na4=~a4) & b3 & (b4 | nb1) | na3 | na1);
this.extra[3 + 1][i] = a3 & (na1 | a1 & na2 | b3 & (na4 ^ b4))
| b3 & (nb1 | b1 & nb2);
this.extra[4 + 1][i] = na3 & (nb1 & nb3 & b4
| b1 & (nb2 & nb3 | a4 & b2 & nb4)
| na1 & a4 & (nb3 | b1 & b2))
| a3 & a4 & (b3 & b4 | b1 & nb2 | na1 & a2)
| na2 & (nb1 & b4 | b1 & nb3 | na1 & a4) & nb2
| a1 & (na3 & (nb3 & b4
| b1 & b2 & b3 & nb4
| na2 & (nb3 | nb2))
| na2 & b3 & b4
| a2 & (nb1 & b4 | a3 & na4 & b1) & nb3)
|nb1 & b2 & b3 & b4;
thisHasNulls = thisHasNulls ||
this.extra[3][i] != 0 ||
this.extra[4][i] != 0 ||
this.extra[5][i] != 0 ;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 37) {
this.extra[5][i] = ~0;
}
}
}
for (; i < copyLimit; i++) {
this.extra[1 + 1][i] = 0;
this.extra[2 + 1][i] = (b2 = otherInits.extra[2 + 1][i]) & (nb3 = ~(b3 = otherInits.extra[3 + 1][i]) | (nb1 = ~(b1 = otherInits.extra[1 + 1][i])));
this.extra[3 + 1][i] = b3 & ((nb2 = ~b2) & (b4 = otherInits.extra[4 + 1][i]) | nb1) | b1 & nb2 & ~b4;
this.extra[4 + 1][i] = (nb3 | nb2) & nb1 & b4 | b1 & nb3 & nb2;
thisHasNulls = thisHasNulls ||
this.extra[3][i] != 0 ||
this.extra[4][i] != 0 ||
this.extra[5][i] != 0;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 38) {
this.extra[5][i] = ~0;
}
}
}
for (; i < resetLimit; i++) {
a1 = this.extra[1 + 1][i];
this.extra[1 + 1][i] = 0;
this.extra[2 + 1][i] = (a2 = this.extra[2 + 1][i]) & (na3 = ~(a3 = this.extra[3 + 1][i]) | (na1 = ~a1));
this.extra[3 + 1][i] = a3 & ((na2 = ~a2) & (a4 = this.extra[4 + 1][i]) | na1) | a1 & na2 & ~a4;
this.extra[4 + 1][i] = (na3 | na2) & na1 & a4 | a1 & na3 & na2;
thisHasNulls = thisHasNulls ||
this.extra[3][i] != 0 ||
this.extra[4][i] != 0 ||
this.extra[5][i] != 0;
if (COVERAGE_TEST_FLAG) {
if(CoverageTestId == 39) {
this.extra[5][i] = ~0;
}
}
}
}
if (thisHasNulls) {
this.tagBits |= NULL_FLAG_MASK;
}
else {
this.tagBits &= ~NULL_FLAG_MASK;
}
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 UnconditionalFlowInfo nullInfoLessUnconditionalCopy() {
if (this == DEAD_END) {
return this;
}
UnconditionalFlowInfo copy = new UnconditionalFlowInfo();
copy.definiteInits = this.definiteInits;
copy.potentialInits = this.potentialInits;
copy.tagBits = this.tagBits & ~NULL_FLAG_MASK;
copy.maxFieldCount = this.maxFieldCount;
if (this.extra != null) {
int length;
copy.extra = new long[extraLength][];
System.arraycopy(this.extra[0], 0,
(copy.extra[0] =
new long[length = this.extra[0].length]), 0, length);
System.arraycopy(this.extra[1], 0,
(copy.extra[1] = new long[length]), 0, length);
for (int j = 2; j < extraLength; j++) {
copy.extra[j] = new long[length];
}
}
return copy;
}
public FlowInfo safeInitsWhenTrue() {
return copy();
}
public FlowInfo setReachMode(int reachMode) {
if (this == DEAD_END) {// cannot modify DEAD_END
return this;
}
if (reachMode == REACHABLE ) {
this.tagBits &= ~UNREACHABLE;
} else if (reachMode == UNREACHABLE_BY_NULLANALYSIS ) {
this.tagBits |= UNREACHABLE_BY_NULLANALYSIS; // do not interfere with definite assignment analysis
} else {
if ((this.tagBits & UNREACHABLE) == 0) {
// reset optional inits when becoming unreachable
// see InitializationTest#test090 (and others)
this.potentialInits = 0;
if (this.extra != null) {
for (int i = 0, length = this.extra[0].length;
i < length; i++) {
this.extra[1][i] = 0;
}
}
}
this.tagBits |= reachMode;
}
return this;
}
public String toString(){
// PREMATURE consider printing bit fields as 0001 0001 1000 0001...
if (this == DEAD_END){
return "FlowInfo.DEAD_END"; //$NON-NLS-1$
}
if ((this.tagBits & NULL_FLAG_MASK) != 0) {
if (this.extra == null) {
return "FlowInfo<def: " + this.definiteInits //$NON-NLS-1$
+", pot: " + this.potentialInits //$NON-NLS-1$
+ ", reachable:" + ((this.tagBits & UNREACHABLE) == 0) //$NON-NLS-1$
+", null: " + this.nullBit1 //$NON-NLS-1$
+ this.nullBit2 + this.nullBit3 + this.nullBit4
+">"; //$NON-NLS-1$
}
else {
String def = "FlowInfo<def:[" + this.definiteInits, //$NON-NLS-1$
pot = "], pot:[" + this.potentialInits, //$NON-NLS-1$
nullS = ", null:[" + this.nullBit1 //$NON-NLS-1$
+ this.nullBit2 + this.nullBit3 + this.nullBit4;
int i, ceil;
for (i = 0, ceil = this.extra[0].length > 3 ?
3 :
this.extra[0].length;
i < ceil; i++) {
def += "," + this.extra[0][i]; //$NON-NLS-1$
pot += "," + this.extra[1][i]; //$NON-NLS-1$
nullS += "," + this.extra[2][i] //$NON-NLS-1$
+ this.extra[3][i] + this.extra[4][i] + this.extra[5][i];
}
if (ceil < this.extra[0].length) {
def += ",..."; //$NON-NLS-1$
pot += ",..."; //$NON-NLS-1$
nullS += ",..."; //$NON-NLS-1$
}
return def + pot
+ "], reachable:" + ((this.tagBits & UNREACHABLE) == 0) //$NON-NLS-1$
+ nullS
+ "]>"; //$NON-NLS-1$
}
}
else {
if (this.extra == null) {
return "FlowInfo<def: " + this.definiteInits //$NON-NLS-1$
+", pot: " + this.potentialInits //$NON-NLS-1$
+ ", reachable:" + ((this.tagBits & UNREACHABLE) == 0) //$NON-NLS-1$
+", no null info>"; //$NON-NLS-1$
}
else {
String def = "FlowInfo<def:[" + this.definiteInits, //$NON-NLS-1$
pot = "], pot:[" + this.potentialInits; //$NON-NLS-1$
int i, ceil;
for (i = 0, ceil = this.extra[0].length > 3 ?
3 :
this.extra[0].length;
i < ceil; i++) {
def += "," + this.extra[0][i]; //$NON-NLS-1$
pot += "," + this.extra[1][i]; //$NON-NLS-1$
}
if (ceil < this.extra[0].length) {
def += ",..."; //$NON-NLS-1$
pot += ",..."; //$NON-NLS-1$
}
return def + pot
+ "], reachable:" + ((this.tagBits & UNREACHABLE) == 0) //$NON-NLS-1$
+ ", no null info>"; //$NON-NLS-1$
}
}
}
public UnconditionalFlowInfo unconditionalCopy() {
return (UnconditionalFlowInfo) copy();
}
public UnconditionalFlowInfo unconditionalFieldLessCopy() {
// TODO (maxime) may consider leveraging null contribution verification as it is done in copy
UnconditionalFlowInfo copy = new UnconditionalFlowInfo();
copy.tagBits = this.tagBits;
copy.maxFieldCount = this.maxFieldCount;
int limit = this.maxFieldCount;
if (limit < BitCacheSize) {
long mask;
copy.definiteInits = this.definiteInits & (mask = ~((1L << limit)-1));
copy.potentialInits = this.potentialInits & mask;
copy.nullBit1 = this.nullBit1 & mask;
copy.nullBit2 = this.nullBit2 & mask;
copy.nullBit3 = this.nullBit3 & mask;
copy.nullBit4 = this.nullBit4 & mask;
}
// use extra vector
if (this.extra == null) {
return copy; // if vector not yet allocated, then not initialized
}
int vectorIndex, length, copyStart;
if ((vectorIndex = (limit / BitCacheSize) - 1) >=
(length = this.extra[0].length)) {
return copy; // not enough room yet
}
long mask;
copy.extra = new long[extraLength][];
if ((copyStart = vectorIndex + 1) < length) {
int copyLength = length - copyStart;
for (int j = 0; j < extraLength; j++) {
System.arraycopy(this.extra[j], copyStart,
(copy.extra[j] = new long[length]), copyStart,
copyLength);
}
}
else if (vectorIndex >= 0) {
for (int j = 0; j < extraLength; j++) {
copy.extra[j] = new long[length];
}
}
if (vectorIndex >= 0) {
mask = ~((1L << (limit % BitCacheSize))-1);
for (int j = 0; j < extraLength; j++) {
copy.extra[j][vectorIndex] =
this.extra[j][vectorIndex] & mask;
}
}
return copy;
}
public UnconditionalFlowInfo unconditionalInits() {
// also see conditional inits, where it requests them to merge
return this;
}
public UnconditionalFlowInfo unconditionalInitsWithoutSideEffect() {
return this;
}
public void resetAssignmentInfo(LocalVariableBinding local) {
resetAssignmentInfo(local.id + this.maxFieldCount);
}
public void resetAssignmentInfo(int position) {
if (this != DEAD_END) {
// position is zero-based
if (position < BitCacheSize) {
// use bits
long mask;
this.definiteInits &= (mask = ~(1L << position));
this.potentialInits &= mask;
} else {
// use extra vector
int vectorIndex = (position / BitCacheSize) - 1;
if (this.extra == null || vectorIndex >= this.extra[0].length) return; // variable doesnt exist in flow info
long mask;
this.extra[0][vectorIndex] &=
(mask = ~(1L << (position % BitCacheSize)));
this.extra[1][vectorIndex] &= mask;
}
}
}
}