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[Java] Preserve serialized ATN version 3 compatibility #3583

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Mar 14, 2022
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[Java] Preserve serialized ATN version 3 compatibility #3583

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14 changes: 10 additions & 4 deletions runtime/Java/src/org/antlr/v4/runtime/atn/ATNDeserializer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,10 +20,10 @@
* @author Sam Harwell
*/
public class ATNDeserializer {
public static final int SERIALIZED_VERSION;
static {
SERIALIZED_VERSION = 4;
}

static final int LEGACY_SERIALIZED_VERSION = 3;
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It's unclear what exacly LEGACY_SERIALIZED_VERSION is. What if SERIALIZED_VERSION will be incremented?

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This is a loose patch to solve an internal problem we have.


public static final int SERIALIZED_VERSION = 4;

interface UnicodeDeserializer {
// Wrapper for readInt() or readInt32()
Expand Down Expand Up @@ -90,6 +90,12 @@ public ATN deserialize(char[] data) {

int p = 0;
int version = toInt(data[p++]);
if (version == LEGACY_SERIALIZED_VERSION) {
// Preserve backwards compatibility for version 3. We simply skip over the UUID and assume all
// features were supported.
p += 8;
version = SERIALIZED_VERSION;
}
Comment on lines +93 to +98
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Use tabs instead of spaces (ANTLR uses tabs formatting).

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Yeah,I am abandoning backward compatibility except for the java target because we have special internal problem to resolve. I'll deal with this when I can look at the 32 bit implementation.

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Yeah, I guess I will do a bit of copy and paste programming for java if I get the 32-bit deserialization going. thanks for pointing this out

if (version != SERIALIZED_VERSION) {
String reason = String.format(Locale.getDefault(), "Could not deserialize ATN with version %d (expected %d).", version, SERIALIZED_VERSION);
throw new UnsupportedOperationException(new InvalidClassException(ATN.class.getName(), reason));
Expand Down