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handle complex IF conditions

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This commit is contained in:
Volker Berlin 2019-08-02 22:39:04 +02:00
parent 215d8ff70e
commit ccbc633463
2 changed files with 70 additions and 28 deletions
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58
src/de/inetsoftware/jwebassembly/module/BranchManger.java
View File

@ -290,6 +290,30 @@ class BranchManger {
* the not consumed operations in the parent branch
*/
private void calculateIf( BranchNode parent, IfParsedBlock startBlock, List<ParsedBlock> parsedOperations ) {
IfPositions positions = searchElsePosition( startBlock, parsedOperations );
BranchNode main = parent;
for( int i = 0; i < positions.ifCount; i++ ) {
IfParsedBlock parsedBlock = (IfParsedBlock)parsedOperations.remove( 0 );
if( startBlock.endPosition < positions.thenPos || startBlock.endPosition == positions.elsePos ) {
// AND concatenation (&& operator)
int pos = parsedBlock.startPosition + 1;
main.add( new BranchNode( startBlock.nextPosition, pos, WasmBlockOperator.IF, null ) );
main.add( new BranchNode( pos, pos + 1, WasmBlockOperator.ELSE, WasmBlockOperator.END ) );
startBlock.negateCompare();
insertConstBeforePosition( 0, pos + 1, parsedBlock.lineNumber ); // 0 --> FALSE for the next if expression
} else {
// OR concatenation (|| operator)
int pos = startBlock.startPosition + 2; // startBlock.startPosition is the position of the compare operation which need before this if construct
main.add( new BranchNode( pos, startBlock.nextPosition, WasmBlockOperator.IF, null ) );
BranchNode node = new BranchNode( startBlock.nextPosition, positions.thenPos, WasmBlockOperator.ELSE, WasmBlockOperator.END );
main.add( node );
main = node;
insertConstBeforePosition( 1, pos + 1, startBlock.lineNumber ); // 1 --> TRUE for the next if expression
}
startBlock = parsedBlock;
}
int i = 0;
int endPos = Math.min( startBlock.endPosition, parent.endPos );
int startPos = startBlock.nextPosition;
@ -298,7 +322,6 @@ class BranchManger {
parent.add( new BranchNode( startPos, startPos, WasmBlockOperator.BR_IF, null, 0 ) );
return;
}
IfPositions positions = searchElsePosition( startBlock, parsedOperations );
BranchNode branch = null;
for( ; i < parsedOperations.size(); i++ ) {
ParsedBlock parsedBlock = parsedOperations.get( i );
@ -345,29 +368,6 @@ class BranchManger {
break;
}
if( i== 0 && parsedBlock.op == JavaBlockOperator.IF ) {
// AND concatenation (&& operator)
if( endPos == positions.elsePos && parsedBlock.endPosition == positions.elsePos ) {
parent.add( new BranchNode( startPos, parsedBlock.nextPosition - 1, WasmBlockOperator.IF, null ) );
parent.add( new BranchNode( parsedBlock.nextPosition - 1, parsedBlock.nextPosition, WasmBlockOperator.ELSE, WasmBlockOperator.END ) );
startPos = parsedBlock.nextPosition;
parsedOperations.remove( 0 );
i--;
((IfParsedBlock)parsedBlock).negateCompare();
insertConstBeforePosition( 0, startPos, parsedBlock.lineNumber ); // 0 --> FALSE for the next if expression
continue;
}
// OR concatenation (|| operator)
if( startBlock.endPosition == parsedBlock.endPosition || startBlock.endPosition == parsedBlock.nextPosition ) {
int pos = startBlock.startPosition + 1; // startBlock.startPosition is the position of the compare operation which need before this if construct
parent.add( new BranchNode( pos, startPos, WasmBlockOperator.IF, null ) );
parent.add( new BranchNode( startPos, endPos, WasmBlockOperator.ELSE, WasmBlockOperator.END ) );
insertConstBeforePosition( 1, pos+1, startBlock.lineNumber ); // 1 --> TRUE for the next if expression
return;
}
}
}
if( branch == null ) {
@ -800,11 +800,13 @@ class BranchManger {
int nextCodePosition = instr.getCodePosition();
if( nextCodePosition <= codePosition ) {
continue;
} else {
codePosition = nextCodePosition;
lineNumber = instr.getLineNumber();
}
idx = root.handle( codePosition, instructions, idx, lineNumber );
lineNumber = instr.getLineNumber();
do {
// call it for every position for the case that a Jump is call to a intermediate position
codePosition++;
idx = root.handle( codePosition, instructions, idx, lineNumber );
} while( codePosition < nextCodePosition );
}
root.handle( byteCode.getCodePosition(), instructions, instructions.size(), byteCode.getLineNumber() );

40
test/de/inetsoftware/jwebassembly/runtime/ControlFlowOperators.java
View File

@ -66,6 +66,11 @@ public class ControlFlowOperators extends AbstractBaseTest {
addParam( list, script, "ifOr3" );
addParam( list, script, "ifOr5" );
addParam( list, script, "ifOr7" );
addParam( list, script, "ifAndOr0" );
addParam( list, script, "ifAndOr2" );
addParam( list, script, "ifAndOr4" );
addParam( list, script, "ifAndOr6" );
addParam( list, script, "ifAndOr8" );
}
rule.setTestParameters( list );
return list;
@ -410,5 +415,40 @@ public class ControlFlowOperators extends AbstractBaseTest {
}
return result;
}
@Export
static int ifAndOr0() {
return ifAndOr( 0 );
}
@Export
static int ifAndOr2() {
return ifAndOr( 2 );
}
@Export
static int ifAndOr4() {
return ifAndOr( 4 );
}
@Export
static int ifAndOr6() {
return ifAndOr( 6 );
}
@Export
static int ifAndOr8() {
return ifAndOr( 8 );
}
private static int ifAndOr( int condition ) {
int result;
if( (condition >= 1 && condition <= 3) || (condition >= 5 && condition <= 7) ) {
result = 42;
} else {
result = 76;
}
return result;
}
}
}