diff src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.java @ 0:61d41facf527

initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
parents
children db918c531e6d
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed under the
+ * Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0. 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+package gov.nasa.jpf.jvm.bytecode;
+
+import gov.nasa.jpf.vm.ClassInfo;
+import gov.nasa.jpf.vm.ElementInfo;
+import gov.nasa.jpf.vm.FieldInfo;
+import gov.nasa.jpf.vm.Instruction;
+import gov.nasa.jpf.vm.LoadOnJPFRequired;
+import gov.nasa.jpf.vm.Scheduler;
+import gov.nasa.jpf.vm.StackFrame;
+import gov.nasa.jpf.vm.ThreadInfo;
+import gov.nasa.jpf.vm.bytecode.ReadInstruction;
+
+
+/**
+ * Get static fieldInfo from class
+ * ..., => ..., value 
+ */
+public class GETSTATIC extends JVMStaticFieldInstruction  implements ReadInstruction {
+
+  public GETSTATIC(String fieldName, String clsDescriptor, String fieldDescriptor){
+    super(fieldName, clsDescriptor, fieldDescriptor);
+  }
+
+  @Override
+  public Instruction execute (ThreadInfo ti) {
+    FieldInfo fieldInfo;
+
+    //--- check if this causes a class load by a user defined classloader
+    try {
+      fieldInfo = getFieldInfo();
+    } catch (LoadOnJPFRequired lre) {
+      return ti.getPC();
+    }
+    
+    if (fieldInfo == null) {
+      return ti.createAndThrowException("java.lang.NoSuchFieldError",
+              (className + '.' + fname));
+    }
+
+    //--- check if this has to trigger class initialization
+    ClassInfo ciField = fieldInfo.getClassInfo();
+    if (!mi.isClinit(ciField) && ciField.pushRequiredClinits(ti)) {
+      // note - this returns the next insn in the topmost clinit that just got pushed
+      return ti.getPC();
+    }
+    ElementInfo eiFieldOwner = ciField.getStaticElementInfo();
+
+    //--- check if this breaks the transition
+    Scheduler scheduler = ti.getScheduler();
+    if (scheduler.canHaveSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
+      eiFieldOwner = scheduler.updateClassSharedness(ti, eiFieldOwner, fieldInfo);
+      if (scheduler.setsSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
+        return this; // re-execute
+      }
+    }
+        
+    Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo);
+    StackFrame frame = ti.getModifiableTopFrame();
+
+    if (size == 1) {
+      int ival = eiFieldOwner.get1SlotField(fieldInfo);
+      lastValue = ival;
+
+      if (fieldInfo.isReference()) {
+        frame.pushRef(ival);
+      } else {
+        frame.push(ival);
+      }
+      
+      if (fieldAttr != null) {
+        frame.setOperandAttr(fieldAttr);
+      }
+
+    } else {
+      long lval = eiFieldOwner.get2SlotField(fieldInfo);
+      lastValue = lval;
+      
+      frame.pushLong(lval);
+      
+      if (fieldAttr != null) {
+        frame.setLongOperandAttr(fieldAttr);
+      }
+    }
+        
+    return getNext(ti);
+  }
+  
+  @Override
+  public boolean isMonitorEnterPrologue(){
+    return GetHelper.isMonitorEnterPrologue(mi, insnIndex);
+  }
+  
+  @Override
+  public int getLength() {
+    return 3; // opcode, index1, index2
+  }
+  
+  @Override
+  public int getByteCode () {
+    return 0xB2;
+  }
+
+  @Override
+  public boolean isRead() {
+    return true;
+  }
+  
+  @Override
+  public void accept(JVMInstructionVisitor insVisitor) {
+	  insVisitor.visit(this);
+  }
+}