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some Java compiler use lookupswitch for a switch with one case

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Volker Berlin 2018-05-08 22:35:44 +02:00
parent 903c2e0e28
commit 91287c9fd3
1 changed files with 13 additions and 6 deletions
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19
src/de/inetsoftware/jwebassembly/module/ModuleWriter.java
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@ -746,23 +746,30 @@ public abstract class ModuleWriter implements Closeable {
startPosition--; startPosition--;
byteCode.readInt(); byteCode.readInt();
boolean writeFirstKey;
int low = 0;
if( op == 171 ) { // lookupswitch if( op == 171 ) { // lookupswitch
int count = byteCode.readInt(); int count = byteCode.readInt();
writeFirstKey = count == 1;
for( int i = 0; i < count; i++ ) { for( int i = 0; i < count; i++ ) {
byteCode.readInt(); int key = byteCode.readInt();
if( i== 0 ) {
low = key;
}
byteCode.readInt(); byteCode.readInt();
} }
} else { } else {
int low = byteCode.readInt(); low = byteCode.readInt();
if( low != 0 ) { // the br_table starts ever with the value 0. That we need to subtract the start value if it different writeFirstKey = true;
writeConstInt( low );
writeNumericOperator( NumericOperator.sub, ValueType.i32 );
}
int count = byteCode.readInt() - low + 1; int count = byteCode.readInt() - low + 1;
for( int i = 0; i < count; i++ ) { for( int i = 0; i < count; i++ ) {
byteCode.readInt(); byteCode.readInt();
} }
} }
if( writeFirstKey && low != 0 ) { // the br_table starts ever with the value 0. That we need to subtract the start value if it different
writeConstInt( low );
writeNumericOperator( NumericOperator.sub, ValueType.i32 );
}
break; break;
case 172: // ireturn case 172: // ireturn
case 173: // lreturn case 173: // lreturn