JDI-based values

src/org/jetbrains/eval4j/jdi/jdiValues.kt

@@ -0,0 +1,58 @@
+package org.jetbrains.eval4j.jdi
+
+import org.jetbrains.eval4j.*
+import org.objectweb.asm.tree.analysis.Frame
+import org.objectweb.asm.tree.MethodNode
+import org.objectweb.asm.Type
+import org.objectweb.asm.Opcodes.*
+import com.sun.jdi
+
+fun makeInitialFrame(methodNode: MethodNode, arguments: List<Value>): Frame<Value> {
+    val isStatic = (methodNode.access and ACC_STATIC) != 0
+    assert(isStatic, "Instance methods are not supported: $methodNode")
+
+    val params = Type.getArgumentTypes(methodNode.desc)
+    assert(params.size == arguments.size(), "Wrong number of arguments for $methodNode: $arguments")
+
+    val frame = Frame<Value>(methodNode.maxLocals, methodNode.maxStack)
+    frame.setReturn(makeNotInitializedValue(Type.getReturnType(methodNode.desc)))
+
+    for ((i, arg) in arguments.withIndices()) {
+        frame.setLocal(i, arg)
+    }
+
+    for (i in arguments.size..methodNode.maxLocals - 1) {
+        frame.setLocal(i, NOT_A_VALUE)
+    }
+    
+    return frame
+}
+
+class JDIFailureException(message: String?, cause: Throwable? = null): RuntimeException(message, cause)
+
+fun <T: Any> T?.sure(message: String? = null): T = this ?: throw JDIFailureException(message)
+
+fun jdi.Value?.asValue(): Value {
+    return when (this) {
+        null -> NULL_VALUE
+        is jdi.VoidValue -> VOID_VALUE
+        is jdi.BooleanValue -> IntValue(intValue(), Type.BOOLEAN_TYPE)
+        is jdi.ByteValue -> IntValue(intValue(), Type.BYTE_TYPE)
+        is jdi.ShortValue -> IntValue(intValue(), Type.SHORT_TYPE)
+        is jdi.CharValue -> IntValue(intValue(), Type.CHAR_TYPE)
+        is jdi.IntegerValue -> IntValue(intValue(), Type.INT_TYPE)
+        is jdi.LongValue -> LongValue(longValue())
+        is jdi.FloatValue -> FloatValue(floatValue())
+        is jdi.DoubleValue -> DoubleValue(doubleValue())
+        is jdi.ObjectReference -> ObjectValue(this, `type`().asType())
+        else -> throw JDIFailureException("Unknown value: $this")
+    }
+}
+
+fun jdi.Type.asType(): Type = Type.getType(this.signature())
+
+val Value.jdiObj: jdi.ObjectReference?
+    get() = this.obj as jdi.ObjectReference?
+
+val Value.jdiClass: jdi.ClassObjectReference?
+    get() = this.jdiObj as jdi.ClassObjectReference?