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Properly handle setting final fields in reflection API

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This commit is contained in:
Marc Baloup 2024-11-24 16:18:14 +01:00
parent ee023b5d2c
commit 9c72b8cda4
1 changed files with 25 additions and 8 deletions
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33
pandalib-reflect/src/main/java/fr/pandacube/lib/reflect/ReflectField.java
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@ -9,7 +9,7 @@ import java.lang.reflect.Modifier;
*/
public final class ReflectField<T> extends ReflectMember<T, String, Field, NoSuchFieldException> {
/* Those fields are used to modify the value of a static variable. Depending on the current Java version,
/* Those fields are used to modify the value of a final variable. Depending on the current Java version,
* one of them will be used for this purpose.
*/
private static sun.misc.Unsafe sunMiscUnsafeInstance;
@ -122,13 +122,30 @@ public final class ReflectField<T> extends ReflectMember<T, String, Field, NoSuc
// if the field is final, we have to do some unsafe stuff :/
if (sunMiscUnsafeInstance != null) { // Java >= 16
// set the value of the field, directly in the memory
if (Modifier.isStatic(realModifiers)) {
long offset = sunMiscUnsafeInstance.staticFieldOffset(f);
sunMiscUnsafeInstance.putObject(sunMiscUnsafeInstance.staticFieldBase(f), offset, value);
} else {
long offset = sunMiscUnsafeInstance.objectFieldOffset(f);
sunMiscUnsafeInstance.putObject(instance, offset, value);
}
Object unsafeObjInstance = Modifier.isStatic(realModifiers)
? sunMiscUnsafeInstance.staticFieldBase(f)
: instance;
long offset = Modifier.isStatic(realModifiers)
? sunMiscUnsafeInstance.staticFieldOffset(f)
: sunMiscUnsafeInstance.objectFieldOffset(f);
if (char.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putChar(unsafeObjInstance, offset, (char)value);
else if (byte.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putByte(unsafeObjInstance, offset, (byte)value);
else if (short.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putShort(unsafeObjInstance, offset, (short)value);
else if (int.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putInt(unsafeObjInstance, offset, (int)value);
else if (long.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putLong(unsafeObjInstance, offset, (long)value);
else if (boolean.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putBoolean(unsafeObjInstance, offset, (boolean)value);
else if (float.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putFloat(unsafeObjInstance, offset, (float)value);
else if (double.class.isAssignableFrom(f.getType()))
sunMiscUnsafeInstance.putDouble(unsafeObjInstance, offset, (double)value);
else
sunMiscUnsafeInstance.putObject(unsafeObjInstance, offset, value);
} else { // Java < 16
// change the modifier in the Field instance so the method #set(instance, value) doesn't throw an exception
try {