[GR-38184] Simplify type state.

PullRequest: graal/11690

Author: cstancu

substratevm/mx.substratevm/suite.py

@@ -1504,6 +1504,7 @@
                 "com.oracle.graal.pointsto.typestate",
                 "com.oracle.graal.pointsto.infrastructure",
                 "com.oracle.graal.pointsto.flow.context.object",
+                "com.oracle.graal.pointsto.flow.context.bytecode",
               ],
               "requires": [
                 "java.management",

substratevm/src/com.oracle.graal.pointsto/src/com/oracle/graal/pointsto/AnalysisObjectScanningObserver.java

@@ -68,12 +68,9 @@ public boolean forNonNullFieldValue(JavaConstant receiver, AnalysisField field,
         /* Add the constant value object to the field's type flow. */
         FieldTypeFlow fieldTypeFlow = getFieldTypeFlow(field, receiver);
         AnalysisObject constantObject = bb.analysisPolicy().createConstantObject(analysis, fieldValue, fieldType);
-        if (!fieldTypeFlow.getState().containsObject(constantObject)) {
-            /* Add the new constant to the field's flow state. */
-            TypeState constantTypeState = TypeState.forNonNullObject(analysis, constantObject);
-            return fieldTypeFlow.addState(analysis, constantTypeState);
-        }
-        return false;
+        /* Add the new constant to the field's flow state. */
+        TypeState constantTypeState = TypeState.forNonNullObject(analysis, constantObject);
+        return fieldTypeFlow.addState(analysis, constantTypeState);
     }
 
     /**
@@ -111,12 +108,9 @@ public boolean forNonNullArrayElement(JavaConstant array, AnalysisType arrayType
         ArrayElementsTypeFlow arrayObjElementsFlow = getArrayElementsFlow(array, arrayType);
         PointsToAnalysis analysis = getAnalysis();
         AnalysisObject constantObject = bb.analysisPolicy().createConstantObject(analysis, elementConstant, elementType);
-        if (!arrayObjElementsFlow.getState().containsObject(constantObject)) {
-            /* Add the constant element to the constant's array type flow. */
-            TypeState elementTypeState = TypeState.forNonNullObject(analysis, constantObject);
-            return arrayObjElementsFlow.addState(analysis, elementTypeState);
-        }
-        return false;
+        /* Add the constant element to the constant's array type flow. */
+        TypeState elementTypeState = TypeState.forNonNullObject(analysis, constantObject);
+        return arrayObjElementsFlow.addState(analysis, elementTypeState);
     }
 
     /**

substratevm/src/com.oracle.graal.pointsto/src/com/oracle/graal/pointsto/AnalysisPolicy.java

@@ -24,6 +24,8 @@
  */
 package com.oracle.graal.pointsto;
 
+import java.util.BitSet;
+
 import org.graalvm.compiler.options.OptionValues;
 
 import com.oracle.graal.pointsto.api.PointstoOptions;
@@ -41,7 +43,10 @@
 import com.oracle.graal.pointsto.meta.AnalysisType;
 import com.oracle.graal.pointsto.meta.AnalysisUniverse;
 import com.oracle.graal.pointsto.meta.PointsToAnalysisMethod;
+import com.oracle.graal.pointsto.typestate.MultiTypeState;
+import com.oracle.graal.pointsto.typestate.SingleTypeState;
 import com.oracle.graal.pointsto.typestate.TypeState;
+import com.oracle.graal.pointsto.typestate.TypeStateUtils;
 import com.oracle.graal.pointsto.typestore.ArrayElementsTypeStore;
 import com.oracle.graal.pointsto.typestore.FieldTypeStore;
 
@@ -169,4 +174,75 @@ public int makePropertiesForUnion(TypeState s1, TypeState s2) {
         /* The default analysis policy doesn't use properties. */
         return 0;
     }
+
+    /**
+     * Simplifies a type state by replacing all context sensitive objects with context insensitive
+     * objects.
+     */
+    public abstract TypeState forContextInsensitiveTypeState(PointsToAnalysis bb, TypeState state);
+
+    public abstract SingleTypeState singleTypeState(PointsToAnalysis bb, boolean canBeNull, int properties, AnalysisType type, AnalysisObject... objects);
+
+    public abstract MultiTypeState multiTypeState(PointsToAnalysis bb, boolean canBeNull, int properties, BitSet typesBitSet, AnalysisObject... objects);
+
+    public abstract TypeState doUnion(PointsToAnalysis bb, SingleTypeState s1, SingleTypeState s2);
+
+    public abstract TypeState doUnion(PointsToAnalysis bb, MultiTypeState s1, SingleTypeState s2);
+
+    public abstract TypeState doUnion(PointsToAnalysis bb, MultiTypeState s1, MultiTypeState s2);
+
+    @SuppressWarnings("static-method")
+    public final TypeState doIntersection(PointsToAnalysis bb, SingleTypeState s1, SingleTypeState s2) {
+        assert !bb.extendedAsserts() || TypeStateUtils.isContextInsensitiveTypeState(bb, s2) : "Current implementation limitation.";
+        boolean resultCanBeNull = s1.canBeNull() && s2.canBeNull();
+        if (s1.exactType().equals(s2.exactType())) {
+            /* The inputs have the same type, the result will be s1. */
+            return s1.forCanBeNull(bb, resultCanBeNull);
+        } else {
+            /* The inputs have different types then the result is empty or null. */
+            return TypeState.forEmpty().forCanBeNull(bb, resultCanBeNull);
+        }
+    }
+
+    @SuppressWarnings("static-method")
+    public final TypeState doIntersection(PointsToAnalysis bb, SingleTypeState s1, MultiTypeState s2) {
+        assert !bb.extendedAsserts() || TypeStateUtils.isContextInsensitiveTypeState(bb, s2) : "Current implementation limitation.";
+        boolean resultCanBeNull = s1.canBeNull() && s2.canBeNull();
+        if (s2.containsType(s1.exactType())) {
+            return s1.forCanBeNull(bb, resultCanBeNull);
+        } else {
+            return TypeState.forEmpty().forCanBeNull(bb, resultCanBeNull);
+        }
+    }
+
+    public abstract TypeState doIntersection(PointsToAnalysis bb, MultiTypeState s1, SingleTypeState s2);
+
+    public abstract TypeState doIntersection(PointsToAnalysis bb, MultiTypeState s1, MultiTypeState s2);
+
+    @SuppressWarnings("static-method")
+    public final TypeState doSubtraction(PointsToAnalysis bb, SingleTypeState s1, SingleTypeState s2) {
+        assert !bb.extendedAsserts() || TypeStateUtils.isContextInsensitiveTypeState(bb, s2) : "Current implementation limitation.";
+        boolean resultCanBeNull = s1.canBeNull() && !s2.canBeNull();
+        if (s1.exactType().equals(s2.exactType())) {
+            return TypeState.forEmpty().forCanBeNull(bb, resultCanBeNull);
+        } else {
+            return s1.forCanBeNull(bb, resultCanBeNull);
+        }
+    }
+
+    @SuppressWarnings("static-method")
+    public final TypeState doSubtraction(PointsToAnalysis bb, SingleTypeState s1, MultiTypeState s2) {
+        assert !bb.extendedAsserts() || TypeStateUtils.isContextInsensitiveTypeState(bb, s2) : "Current implementation limitation.";
+        boolean resultCanBeNull = s1.canBeNull() && !s2.canBeNull();
+        if (s2.containsType(s1.exactType())) {
+            return TypeState.forEmpty().forCanBeNull(bb, resultCanBeNull);
+        } else {
+            return s1.forCanBeNull(bb, resultCanBeNull);
+        }
+    }
+
+    public abstract TypeState doSubtraction(PointsToAnalysis bb, MultiTypeState s1, SingleTypeState s2);
+
+    public abstract TypeState doSubtraction(PointsToAnalysis bb, MultiTypeState s1, MultiTypeState s2);
+
 }