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Fix a loop inside an ELSE block

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This commit is contained in:
Volker Berlin 2022-01-23 16:48:40 +01:00
parent ff4f5f8151
commit ec7f23a35f
2 changed files with 51 additions and 4 deletions
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30
src/de/inetsoftware/jwebassembly/module/BranchManager.java
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@ -208,12 +208,29 @@ class BranchManager {
for( int n = b + 1; n < allParsedOperations.size(); n++ ) {
ParsedBlock nextBlock = allParsedOperations.get( n );
if( nextBlock.op == JavaBlockOperator.IF && nextBlock.endPosition == nextPos ) { // Eclipse loop with normal goto
int conditionStart = parsedBlock.endPosition;
int conditionEnd = nextBlock.nextPosition;
convertToLoop( parsedBlock, conditionStart, conditionEnd );
allParsedOperations.remove( n );
((IfParsedBlock)nextBlock).negateCompare();
int conditionStart = parsedBlock.endPosition;
int conditionEnd = nextBlock.nextPosition;
if( conditionStart == conditionEnd ) {
// WHILE loop in ELSE block.
// The GOTO from the ELSE and the jump to the end of the WHILE loop is merged to one GOTO.
for( n = b - 1; n >= 0; n-- ) {
ParsedBlock prevBlock = allParsedOperations.get( n );
if( prevBlock.endPosition > nextPos ) {
conditionStart = prevBlock.endPosition;
prevBlock.endPosition = parsedBlock.nextPosition;
// Create the second GOTO
allParsedOperations.add( b, new ParsedBlock( JavaBlockOperator.GOTO, parsedBlock.startPosition, parsedBlock.endPosition - parsedBlock.startPosition, parsedBlock.nextPosition, parsedBlock.lineNumber ) );
// we have only 3 code positions but need 6 for two GOTO
parsedBlock.startPosition = parsedBlock.nextPosition;
break;
}
}
}
convertToLoop( parsedBlock, conditionStart, conditionEnd );
// if conditions that point at the end of the loop for optimization must now point at start.
for( n = b - 1; n >= 0; n-- ) {
ParsedBlock prevBlock = allParsedOperations.get( n );
@ -223,11 +240,16 @@ class BranchManager {
}
break;
}
if( nextBlock.op == JavaBlockOperator.GOTO && nextBlock.endPosition == nextPos && n > 1 ) { // Eclipse loop with wide goto_w
if( nextBlock.op == JavaBlockOperator.GOTO && nextBlock.endPosition == nextPos ) { // Eclipse loop with wide goto_w
ParsedBlock prevBlock = allParsedOperations.get( n - 1 );
if( prevBlock.op == JavaBlockOperator.IF && prevBlock.endPosition == nextBlock.nextPosition ) {
int conditionStart = parsedBlock.endPosition;
int conditionEnd = prevBlock.nextPosition;
if( conditionStart >= conditionEnd ) {
// WHILE loop in ELSE block.
// occur with java.math.BigInteger.add(int[],int[]) in Java 8
break;
}
convertToLoop( parsedBlock, conditionStart, conditionEnd );
allParsedOperations.remove( n );
allParsedOperations.remove( n - 1 );

25
test/de/inetsoftware/jwebassembly/runtime/ControlFlowOperators.java
View File

@ -51,6 +51,8 @@ public class ControlFlowOperators extends AbstractBaseTest {
addParam( list, script, "doWhileLoopWithBreak" );
addParam( list, script, "whileLoop" );
addParam( list, script, "whileLoopWithContinue" );
addParam( list, script, "whileLoopInElse_3" );
addParam( list, script, "whileLoopInElse_13" );
addParam( list, script, "forLoop" );
addParam( list, script, "conditionalOperator" );
addParam( list, script, "conditionalOperator2" );
@ -351,6 +353,29 @@ public class ControlFlowOperators extends AbstractBaseTest {
return value;
}
private static int whileLoopInElse( int yIndex ) {
int result = 0;
if( yIndex == 3 ) {
result = 42;
} else {
while( yIndex > 7 ) {
result++;
yIndex--;
}
}
return result;
}
@Export
public static int whileLoopInElse_3() {
return whileLoopInElse( 3 );
}
@Export
public static int whileLoopInElse_13() {
return whileLoopInElse( 13 );
}
@Export
static int forLoop() {
int a = 0;