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extract method writeSwitchCode()

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This commit is contained in:
Volker Berlin 2018-05-12 09:48:09 +02:00
parent 6c971c6525
commit 6a7744e228
1 changed files with 83 additions and 60 deletions
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143
src/de/inetsoftware/jwebassembly/module/ModuleWriter.java
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@ -831,66 +831,7 @@ public abstract class ModuleWriter implements Closeable {
break;
case 170: // tableswitch
case 171: // lookupswitch
int startPosition = byteCode.getCodePosition();
int padding = startPosition % 4;
if( padding > 0 ) {
byteCode.skip( 4 - padding );
}
startPosition--;
int defaultPosition = byteCode.readInt();
if( op == 171 ) { // lookupswitch
int count = byteCode.readInt();
int[] keys = new int[count];
int[] positions = new int[count];
for( int i = 0; i < count; i++ ) {
keys[i] = byteCode.readInt();
positions[i] = byteCode.readInt();
}
int tempI32 = localVariables.getTempI32();
int block = 0;
int defaultBlock = -1;
int currentPos = -1;
writeLoadStore( false, tempI32 );
do {
int nextPos = findNext( currentPos, positions );
if( nextPos == currentPos ) {
break;
}
currentPos = nextPos;
if( defaultBlock < 0 ) {
if( defaultPosition <= currentPos ) {
defaultBlock = block;
if( defaultPosition < currentPos ) {
block++;
}
}
}
for( int i = 0; i < positions.length; i++ ) {
if( positions[i] == currentPos ) {
writeLoadStore( true, tempI32 );
writeConstInt( keys[i] );
writeNumericOperator( NumericOperator.eq, ValueType.i32 );
writeBlockCode( WasmBlockOperator.BR_IF, block );
}
}
block++;
} while( true );
if( defaultBlock < 0) {
defaultBlock = block;
}
writeBlockCode( WasmBlockOperator.BR, defaultBlock );
} else {
int low = byteCode.readInt();
int count = byteCode.readInt() - low + 1;
for( int i = 0; i < count; i++ ) {
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
writeConstInt( low );
writeNumericOperator( NumericOperator.sub, ValueType.i32 );
}
}
writeSwitchCode( byteCode, op == 171 );
break;
case 172: // ireturn
case 173: // lreturn
@ -915,6 +856,88 @@ public abstract class ModuleWriter implements Closeable {
}
}
/**
* Write the both switch operation codes
*
* @param byteCode
* the current stream with a position after the operation code
* @param isLookupSwitch
* true, if the operation was a loopupswitch; false, if the operation was a tableswitch
* @throws IOException
* if any I/O error occur
*/
private void writeSwitchCode( CodeInputStream byteCode, boolean isLookupSwitch ) throws IOException {
int startPosition = byteCode.getCodePosition();
int padding = startPosition % 4;
if( padding > 0 ) {
byteCode.skip( 4 - padding );
}
startPosition--;
int defaultPosition = byteCode.readInt();
if( isLookupSwitch ) { // lookupswitch
int count = byteCode.readInt();
int[] keys = new int[count];
int[] positions = new int[count];
for( int i = 0; i < count; i++ ) {
keys[i] = byteCode.readInt();
positions[i] = byteCode.readInt();
}
int tempI32 = localVariables.getTempI32();
int block = 0;
int defaultBlock = -1;
int currentPos = -1;
writeLoadStore( false, tempI32 );
do {
int nextPos = findNext( currentPos, positions );
if( nextPos == currentPos ) {
break;
}
currentPos = nextPos;
if( defaultBlock < 0 ) {
if( defaultPosition <= currentPos ) {
defaultBlock = block;
if( defaultPosition < currentPos ) {
block++;
}
}
}
for( int i = 0; i < positions.length; i++ ) {
if( positions[i] == currentPos ) {
writeLoadStore( true, tempI32 );
writeConstInt( keys[i] );
writeNumericOperator( NumericOperator.eq, ValueType.i32 );
writeBlockCode( WasmBlockOperator.BR_IF, block );
}
}
block++;
} while( true );
if( defaultBlock < 0 ) {
defaultBlock = block;
}
writeBlockCode( WasmBlockOperator.BR, defaultBlock );
} else {
int low = byteCode.readInt();
int count = byteCode.readInt() - low + 1;
for( int i = 0; i < count; i++ ) {
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
writeConstInt( low );
writeNumericOperator( NumericOperator.sub, ValueType.i32 );
}
}
}
/**
* Find the next higher value.
*
* @param current
* the current value
* @param values
* the unordered list of values
* @return the next value or current value if not found.
*/
private static int findNext( int current, int[] values ) {
boolean find = false;
int next = Integer.MAX_VALUE;