implement impdep1 instruction for lazily loading bootstrap classes

makefile

@@ -28,7 +28,7 @@ src = src
 classpath = classpath
 test = test
 
-input = $(test-build)/Reflection.class
+input = $(test-build)/References.class
 
 build-cxx = g++
 build-cc = gcc

src/interpret.cpp

@@ -1082,8 +1082,9 @@ interpret(Thread* t)
            (t, className(t, objectClass(t, peekObject(t, sp - 1))), 0),
            &byteArrayBody(t, className(t, class_), 0));
         exception = makeClassCastException(t, message);
-        goto throw_;
       }
+
+      if (UNLIKELY(exception)) goto throw_;
     }
   } goto loop;
 
@@ -1784,6 +1785,8 @@ interpret(Thread* t)
       } else {
         pushInt(t, 0);
       }
+
+      if (UNLIKELY(exception)) goto throw_;
     } else {
       popObject(t);
       pushInt(t, 0);
@@ -1852,6 +1855,10 @@ interpret(Thread* t)
     object method = resolveMethod(t, codePool(t, code), index - 1);
     if (UNLIKELY(exception)) goto throw_;
 
+    fprintf(stderr, "invokevirtual %s.%s\n",
+            &byteArrayBody(t, className(t, methodClass(t, method)), 0),
+            &byteArrayBody(t, methodName(t, method), 0));
+    
     unsigned parameterFootprint = methodParameterFootprint(t, method);
     if (LIKELY(peekObject(t, sp - parameterFootprint))) {
       object class_ = objectClass(t, peekObject(t, sp - parameterFootprint));
@@ -2571,9 +2578,27 @@ interpret(Thread* t)
 
   case impdep1: {
     // this means we're invoking a virtual method on an instance of a
-    // bootstrap class, so we need to load the real class.
+    // bootstrap class, so we need to load the real class to get the
-    abort(t);
+    // real method and call it.
-  } break;
+
+    assert(t, frameNext(t, frame) >= base);
+    popFrame(t);
+
+    assert(t, codeBody(t, code, ip - 3) == invokevirtual);
+    ip -= 2;
+
+    uint16_t index = codeReadInt16(t, code, ip);
+    object method = resolveMethod(t, codePool(t, code), index - 1);
+
+    unsigned parameterFootprint = methodParameterFootprint(t, method);
+    object class_ = objectClass(t, peekObject(t, sp - parameterFootprint));
+    assert(t, classVmFlags(t, class_) & BootstrapFlag);
+    
+    resolveClass(t, className(t, class_));
+    if (UNLIKELY(exception)) goto throw_;
+
+    ip -= 3;
+  } goto loop;
 
   default: abort(t);
   }
@@ -2738,6 +2763,10 @@ invoke(Thread* t, object method)
     unsigned parameterFootprint = methodParameterFootprint(t, method);
     class_ = objectClass(t, peekObject(t, t->sp - parameterFootprint));
 
+    if (classVmFlags(t, class_) & BootstrapFlag) {
+      resolveClass(t, className(t, class_));
+    }
+
     if (classFlags(t, methodClass(t, method)) & ACC_INTERFACE) {
       method = findInterfaceMethod(t, method, class_);
     } else {

src/machine.cpp

@@ -2131,6 +2131,7 @@ isAssignableFrom(Thread* t, object a, object b)
   if (classFlags(t, a) & ACC_INTERFACE) {
     if (classVmFlags(t, b) & BootstrapFlag) {
       resolveClass(t, className(t, b));
+      if (UNLIKELY(t->exception)) return false;
     }
 
     for (; b; b = classSuper(t, b)) {

src/machine.h

@@ -29,7 +29,7 @@ const bool Verbose = false;
 const bool DebugRun = false;
 const bool DebugStack = false;
 const bool DebugMonitors = false;
-const bool DebugReferences = false;
+const bool DebugReferences = true;
 
 const uintptr_t HashTakenMark = 1;
 const uintptr_t ExtendedMark = 2;

test/Misc.java

@@ -17,6 +17,8 @@ public class Misc {
   public static void main(String[] args) {
     boolean v = Boolean.valueOf("true");
 
+    ClassLoader.getSystemClassLoader().toString();
+
     int a = 2;
     int b = 2;
     int c = a + b;