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fix concatenated conditional operators

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This commit is contained in:
Volker Berlin 2022-01-01 21:03:06 +01:00
parent db2444340e
commit 27faeada39
2 changed files with 58 additions and 14 deletions
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61
src/de/inetsoftware/jwebassembly/module/BranchManger.java
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@ -1,5 +1,5 @@
/*
Copyright 2018 - 2021 Volker Berlin (i-net software)
Copyright 2018 - 2022 Volker Berlin (i-net software)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
@ -409,7 +409,7 @@ class BranchManger {
// 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 );
BranchNode node = new BranchNode( startBlock.nextPosition, positions.thenPos - 1, WasmBlockOperator.ELSE, WasmBlockOperator.END );
main.add( node );
main = node;
insertConstBeforePosition( 1, pos + 1, startBlock.lineNumber ); // 1 --> TRUE for the next if expression
@ -466,7 +466,7 @@ class BranchManger {
}
if( branch == null ) {
branch = new BranchNode( startPos, endPos, WasmBlockOperator.IF, WasmBlockOperator.END, ValueType.empty );
branch = new BranchNode( startPos - 1, endPos, WasmBlockOperator.IF, WasmBlockOperator.END, ValueType.empty );
parent.add( branch );
if( startBlock.endPosition > parent.endPos ) {
int count = 0;
@ -485,9 +485,9 @@ class BranchManger {
count++;
}
if( count == 0 ) {
// we jump outside the parent and there are no instructions. This is lie a conditional break
// we jump outside the parent and there are no instructions. This is like a conditional break
//TODO should be BR_IF
breakOperations.add( new BreakBlock( branch, branch.endPos, startBlock.endPosition ) );
breakOperations.add( new BreakBlock( branch, endPos, startBlock.endPosition ) );
return;
}
}
@ -1289,21 +1289,42 @@ class BranchManger {
}
if( parent != null && parent.elseEndPos > gotoEndPos ) {
// check if we break into an ELSE block which is possible in Java with a GOTO, occur with concatenated conditional operators
for( int i = 1; i < parent.size(); i++ ) {
BranchNode node = parent.get( i );
System.err.println( node.startOp + " " + node.startPos + " " + node.endPos );
if( gotoEndPos == node.startPos ) {
if( node.startOp == WasmBlockOperator.ELSE ) {
// we can't break into an else block that we break to the IF and push a zero to the stack
node = parent.get( i - 1 ); // should be the IF to the ELSE
breakBlock.endPosition = node.startPos;
breakBlock.breakToElseBlock = true;
calculateBreak( breakBlock );
return;
}
break;
}
}
BranchNode middleNode = new BranchNode( parent.startPos, gotoEndPos, WasmBlockOperator.BLOCK, WasmBlockOperator.END );
for( Iterator<BranchNode> it = parent.iterator(); it.hasNext(); ) {
BranchNode child = it.next();
while( !parent.isEmpty() ) {
BranchNode child = parent.get( 0 );
if( child.endPos > gotoEndPos ) {
continue;
break;
}
middleNode.add( child );
it.remove();
parent.remove( 0 );
}
parent.add( middleNode );
//deep++;
parent.add( 0, middleNode );
parent = middleNode;
patchBrDeep( middleNode );
}
if( breakBlock.breakToElseBlock ) {
// push zero that we switch into the ELSE block
insertConstBeforePosition( 0, breakBlock.breakPos, -1 );
}
BranchNode breakNode = new BranchNode( breakBlock.breakPos, breakBlock.breakPos, WasmBlockOperator.BR, null, deep + 1 );
branch.add( breakNode );
}
@ -1626,7 +1647,8 @@ class BranchManger {
}
if( instr.getType() == Type.Block ) {
switch( ((WasmBlockInstruction)instr).getOperation() ) {
WasmBlockInstruction blockInstr = (WasmBlockInstruction)instr;
switch( blockInstr.getOperation() ) {
case RETURN:
// set "empty" block type
while( stack.size() > 1 ) {
@ -1643,6 +1665,17 @@ class BranchManger {
case END:
case ELSE:
break INSTRUCTIONS;
case BR:
Integer data = (Integer)blockInstr.getData();
if( data > 0 ) {
// TODO we should check the ELSE block in this case if there is any
// set "empty" block type
while( stack.size() > 1 ) {
stack.pop();
}
}
break INSTRUCTIONS;
default:
}
}
}
@ -1708,10 +1741,12 @@ class BranchManger {
private final int breakPos;
private final int endPosition;
private int endPosition;
private final BranchNode branch;
private boolean breakToElseBlock;
/**
* Create Break
*

11
test/de/inetsoftware/jwebassembly/runtime/ControlFlowOperators.java
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@ -1,5 +1,5 @@
/*
* Copyright 2018 - 2021 Volker Berlin (i-net software)
* Copyright 2018 - 2022 Volker Berlin (i-net software)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -55,6 +55,7 @@ public class ControlFlowOperators extends AbstractBaseTest {
addParam( list, script, "conditionalOperator" );
addParam( list, script, "conditionalOperator2" );
addParam( list, script, "conditionalOperatorConcated" );
addParam( list, script, "conditionalOperatorConcated2" );
addParam( list, script, "redifineVariable" );
addParam( list, script, "ifAnd_0" );
addParam( list, script, "ifAnd_3" );
@ -381,6 +382,14 @@ public class ControlFlowOperators extends AbstractBaseTest {
return result;
}
@Export
static int conditionalOperatorConcated2() {
int a = 7;
int b = 13;
int c = 42;
return (a < 0 ? a != b : a != c ) && (b < 0 ? false : b == c ) ? 17 : 18;
}
@Export
static double redifineVariable() {
int x = 42;