#1077 VerifyError when Safe Invoke is used to call java method returning int

alex_panchenko Fri 16 Apr 2010

Launching this

using [java] java.util::List
class Main 
  Obj? test(List? list)
    return list?.size()
  public static Void main(Str[] args)
    echo("it runs")

Results in

java.lang.VerifyError: (class: fan/Main_0/Main, 
method: test signature: (Ljava/util/List;)Ljava/lang/Object;) Mismatched stack types
	at java.lang.Class.getDeclaredFields0(Native Method)
	at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
	at java.lang.Class.getDeclaredFields(Class.java:1743)
	at fan.sys.ClassType.finishSlots(ClassType.java:562)
	at fan.sys.ClassType.finish(ClassType.java:525)
	at fan.sys.Method$MethodFunc.isStatic(Method.java:459)
	at fan.sys.Method$MethodFunc.callList(Method.java:175)
	at fan.sys.Method.callList(Method.java:147)
	at fanx.tools.Fan.callMain(Fan.java:135)
	at fanx.tools.Fan.executeFile(Fan.java:88)
	at fanx.tools.Fan.execute(Fan.java:34)
	at fanx.tools.Fan.run(Fan.java:236)
	at fanx.tools.Fan.main(Fan.java:274)

If I change ?. to . then it compiles successfully.

brian Fri 16 Apr 2010

Promoted to ticket #1077 and assigned to brian

brian Tue 11 May 2010

Ticket resolved in 1.0.53

This problem uncovered a number of issues:

  1. CodeAsm was using the incorrect type for the Pop of the nullable target in a safe invoke call
  2. the Java primitive types were not correctly reporting themselves as value types
  3. I fixed the Java primitive type conversion to nullable types to match the standard Fantom nullable types Bool?, Int? and Float?
  4. FFI coercion must occur after safe invoke coercion


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