More cases for nullability analysis

idea/src/org/jetbrains/jet/lang/cfg/BlockInfo.java

+package org.jetbrains.jet.lang.cfg;
+
+/**
+* @author abreslav
+*/
+public abstract class BlockInfo {}

idea/src/org/jetbrains/jet/lang/cfg/BreakableBlockInfo.java

+package org.jetbrains.jet.lang.cfg;
+
+import org.jetbrains.jet.lang.psi.JetElement;
+
+/**
+* @author abreslav
+*/
+public class BreakableBlockInfo extends BlockInfo {
+    private final JetElement element;
+    private final Label entryPoint;
+    private final Label exitPoint;
+
+    public BreakableBlockInfo(JetElement element, Label entryPoint, Label exitPoint) {
+        this.element = element;
+        this.entryPoint = entryPoint;
+        this.exitPoint = exitPoint;
+    }
+
+    public JetElement getElement() {
+        return element;
+    }
+
+    public Label getEntryPoint() {
+        return entryPoint;
+    }
+
+    public Label getExitPoint() {
+        return exitPoint;
+    }
+}

idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowBuilder.java

@@ -31,7 +31,7 @@ public interface JetControlFlowBuilder {
     Label getExitPoint(@NotNull JetElement labelElement);
 
     // Loops
-    Label enterLoop(@NotNull JetExpression expression, Label loopExitPoint);
+    LoopInfo enterLoop(@NotNull JetExpression expression, @Nullable Label loopExitPoint, @Nullable Label conditionEntryPoint);
 
     void exitLoop(@NotNull JetExpression expression);
     @Nullable

idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowBuilderAdapter.java

@@ -73,8 +73,8 @@ public class JetControlFlowBuilderAdapter implements JetControlFlowBuilder {
     }
 
     @Override
-    public Label enterLoop(@NotNull JetExpression expression, Label loopExitPoint) {
-        return builder.enterLoop(expression, loopExitPoint);
+    public LoopInfo enterLoop(@NotNull JetExpression expression, Label loopExitPoint, Label conditionEntryPoint) {
+        return builder.enterLoop(expression, loopExitPoint, conditionEntryPoint);
     }
 
     @Override

idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowProcessor.java

@@ -350,35 +350,40 @@ public class JetControlFlowProcessor {
 
         @Override
         public void visitWhileExpression(JetWhileExpression expression) {
-            Label loopExitPoint = builder.createUnboundLabel();
-            Label loopEntryPoint = builder.enterLoop(expression, loopExitPoint);
+            LoopInfo loopInfo = builder.enterLoop(expression, null, null);
+
+            builder.bindLabel(loopInfo.getConditionEntryPoint());
             JetExpression condition = expression.getCondition();
             if (condition != null) {
                 value(condition, false, true);
             }
-            builder.jumpOnFalse(loopExitPoint);
+            builder.jumpOnFalse(loopInfo.getExitPoint());
+
+            builder.bindLabel(loopInfo.getBodyEntryPoint());
             JetExpression body = expression.getBody();
             if (body != null) {
                 value(body, true, false);
             }
-            builder.jump(loopEntryPoint);
+            builder.jump(loopInfo.getEntryPoint());
             builder.exitLoop(expression);
             builder.readUnit(expression);
         }
 
         @Override
         public void visitDoWhileExpression(JetDoWhileExpression expression) {
-            Label loopExitPoint = builder.createUnboundLabel();
-            Label loopEntryPoint = builder.enterLoop(expression, loopExitPoint);
+            LoopInfo loopInfo = builder.enterLoop(expression, null, null);
+
+            builder.bindLabel(loopInfo.getBodyEntryPoint());
             JetExpression body = expression.getBody();
             if (body != null) {
                 value(body, true, false);
             }
+            builder.bindLabel(loopInfo.getConditionEntryPoint());
             JetExpression condition = expression.getCondition();
             if (condition != null) {
                 value(condition, false, true);
             }
-            builder.jumpOnTrue(loopEntryPoint);
+            builder.jumpOnTrue(loopInfo.getEntryPoint());
             builder.exitLoop(expression);
             builder.readUnit(expression);
         }
@@ -391,13 +396,20 @@ public class JetControlFlowProcessor {
             }
             // TODO : primitive cases
             Label loopExitPoint = builder.createUnboundLabel();
+            Label conditionEntryPoint = builder.createUnboundLabel();
+
+            builder.bindLabel(conditionEntryPoint);
             builder.nondeterministicJump(loopExitPoint);
-            Label loopEntryPoint = builder.enterLoop(expression, loopExitPoint);
+
+            LoopInfo loopInfo = builder.enterLoop(expression, loopExitPoint, conditionEntryPoint);
+
+            builder.bindLabel(loopInfo.getBodyEntryPoint());
             JetExpression body = expression.getBody();
             if (body != null) {
                 value(body, true, false);
             }
-            builder.nondeterministicJump(loopEntryPoint);
+
+            builder.nondeterministicJump(loopInfo.getEntryPoint());
             builder.exitLoop(expression);
             builder.readUnit(expression);
         }

idea/src/org/jetbrains/jet/lang/cfg/JetFlowInformationProvider.java

@@ -3,6 +3,7 @@ package org.jetbrains.jet.lang.cfg;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.lang.psi.JetElement;
 import org.jetbrains.jet.lang.psi.JetExpression;
+import org.jetbrains.jet.lang.psi.JetLoopExpression;
 
 import java.util.Collection;
 
@@ -25,6 +26,12 @@ public interface JetFlowInformationProvider {
         public void collectDominatedExpressions(@NotNull JetExpression dominator, @NotNull Collection<JetElement> dominated) {
             throw new UnsupportedOperationException();
         }
+
+        @Override
+        public boolean isBreakable(JetLoopExpression loop) {
+            throw new UnsupportedOperationException();
+        }
+
     };
 
     JetFlowInformationProvider NONE = new JetFlowInformationProvider() {
@@ -42,6 +49,12 @@ public interface JetFlowInformationProvider {
         public void collectDominatedExpressions(@NotNull JetExpression dominator, @NotNull Collection<JetElement> dominated) {
 
         }
+
+        @Override
+        public boolean isBreakable(JetLoopExpression loop) {
+            return false;
+        }
+
     };
 
     void collectReturnedInformation(
@@ -56,4 +69,6 @@ public interface JetFlowInformationProvider {
     void collectDominatedExpressions(
             @NotNull JetExpression dominator,
             @NotNull Collection<JetElement> dominated);
+
+    boolean isBreakable(JetLoopExpression loop);
 }

idea/src/org/jetbrains/jet/lang/cfg/LoopInfo.java

+package org.jetbrains.jet.lang.cfg;
+
+import org.jetbrains.jet.lang.psi.JetElement;
+
+/**
+* @author abreslav
+*/
+public class LoopInfo extends BreakableBlockInfo {
+    private final Label bodyEntryPoint;
+    private final Label conditionEntryPoint;
+
+    public LoopInfo(JetElement element, Label entryPoint, Label exitPoint, Label bodyEntryPoint, Label conditionEntryPoint) {
+        super(element, entryPoint, exitPoint);
+        this.bodyEntryPoint = bodyEntryPoint;
+        this.conditionEntryPoint = conditionEntryPoint;
+    }
+
+    public Label getBodyEntryPoint() {
+        return bodyEntryPoint;
+    }
+
+    public Label getConditionEntryPoint() {
+        return conditionEntryPoint;
+    }
+}

idea/src/org/jetbrains/jet/lang/cfg/pseudocode/JetControlFlowInstructionsGenerator.java

 package org.jetbrains.jet.lang.cfg.pseudocode;
 
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.lang.cfg.GenerationTrigger;
-import org.jetbrains.jet.lang.cfg.JetControlFlowBuilder;
-import org.jetbrains.jet.lang.cfg.JetControlFlowBuilderAdapter;
-import org.jetbrains.jet.lang.cfg.Label;
+import org.jetbrains.jet.lang.cfg.*;
 import org.jetbrains.jet.lang.psi.JetElement;
 import org.jetbrains.jet.lang.psi.JetExpression;
 import org.jetbrains.jet.lang.psi.JetFunctionLiteralExpression;
@@ -101,14 +98,20 @@ public class JetControlFlowInstructionsGenerator extends JetControlFlowBuilderAd
         }
 
         @Override
-        public final Label enterLoop(@NotNull JetExpression expression, Label loopExitPoint) {
+        public final LoopInfo enterLoop(@NotNull JetExpression expression, Label loopExitPoint, Label conditionEntryPoint) {
             Label label = createUnboundLabel();
             bindLabel(label);
-            BreakableBlockInfo blockInfo = new BreakableBlockInfo(expression, label, loopExitPoint);
+            LoopInfo blockInfo = new LoopInfo(
+                    expression,
+                    label,
+                    loopExitPoint != null ? loopExitPoint : createUnboundLabel(),
+                    createUnboundLabel(),
+                    conditionEntryPoint != null ? conditionEntryPoint : createUnboundLabel());
             loopInfo.push(blockInfo);
             elementToBlockInfo.put(expression, blockInfo);
             allBlocks.push(blockInfo);
-            return label;
+            trace.recordLoopInfo(expression, blockInfo);
+            return blockInfo;
         }
 
         @Override
@@ -265,9 +268,7 @@ public class JetControlFlowInstructionsGenerator extends JetControlFlowBuilderAd
         }
     }
 
-    private static abstract class BlockInfo {}
-
-    private static class TryFinallyBlockInfo extends BlockInfo {
+    public static class TryFinallyBlockInfo extends BlockInfo {
         private final GenerationTrigger finallyBlock;
 
         private TryFinallyBlockInfo(GenerationTrigger finallyBlock) {
@@ -279,27 +280,4 @@ public class JetControlFlowInstructionsGenerator extends JetControlFlowBuilderAd
         }
     }
 
-    private static class BreakableBlockInfo extends BlockInfo {
-        private final JetElement element;
-        private final Label entryPoint;
-        private final Label exitPoint;
-
-        private BreakableBlockInfo(JetElement element, Label entryPoint, Label exitPoint) {
-            this.element = element;
-            this.entryPoint = entryPoint;
-            this.exitPoint = exitPoint;
-        }
-
-        public JetElement getElement() {
-            return element;
-        }
-
-        public Label getEntryPoint() {
-            return entryPoint;
-        }
-
-        public Label getExitPoint() {
-            return exitPoint;
-        }
-    }
 }

idea/src/org/jetbrains/jet/lang/cfg/pseudocode/JetPseudocodeTrace.java

 package org.jetbrains.jet.lang.cfg.pseudocode;
 
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.jet.lang.cfg.LoopInfo;
 import org.jetbrains.jet.lang.psi.JetElement;
+import org.jetbrains.jet.lang.psi.JetExpression;
 
 /**
  * @author abreslav
@@ -21,10 +23,16 @@ public interface JetPseudocodeTrace {
         @Override
         public void close() {
         }
+
+        @Override
+        public void recordLoopInfo(JetExpression expression, LoopInfo blockInfo) {
+
+        }
     };
 
     void recordControlFlowData(@NotNull JetElement element, @NotNull Pseudocode pseudocode);
     void recordRepresentativeInstruction(@NotNull JetElement element, @NotNull Instruction instruction);
     void close();
 
+    void recordLoopInfo(JetExpression expression, LoopInfo blockInfo);
 }

idea/src/org/jetbrains/jet/lang/cfg/pseudocode/Pseudocode.java

@@ -46,6 +46,11 @@ public class Pseudocode {
             return instructions.subList(getTargetInstructionIndex(), instructions.size());
         }
 
+        public Instruction resolveToInstruction() {
+            assert targetInstructionIndex != null;
+            return instructions.get(targetInstructionIndex);
+        }
+
     }
 
     private final List<Instruction> instructions = new ArrayList<Instruction>();

idea/src/org/jetbrains/jet/lang/resolve/ClassDescriptorResolver.java

@@ -2,6 +2,7 @@ package org.jetbrains.jet.lang.resolve;
 
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 import com.intellij.lang.ASTNode;
 import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
@@ -9,6 +10,7 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.JetSemanticServices;
 import org.jetbrains.jet.lang.cfg.JetControlFlowProcessor;
 import org.jetbrains.jet.lang.cfg.JetFlowInformationProvider;
+import org.jetbrains.jet.lang.cfg.LoopInfo;
 import org.jetbrains.jet.lang.cfg.pseudocode.*;
 import org.jetbrains.jet.lang.descriptors.*;
 import org.jetbrains.jet.lang.psi.*;
@@ -721,6 +723,7 @@ public class ClassDescriptorResolver {
         final JetPseudocodeTrace pseudocodeTrace = flowDataTraceFactory.createTrace(declaration);
         final Map<JetElement, Pseudocode> pseudocodeMap = new HashMap<JetElement, Pseudocode>();
         final Map<JetElement, Instruction> representativeInstructions = new HashMap<JetElement, Instruction>();
+        final Map<JetExpression, LoopInfo> loopInfo = Maps.newHashMap();
         JetPseudocodeTrace wrappedTrace = new JetPseudocodeTrace() {
             @Override
             public void recordControlFlowData(@NotNull JetElement element, @NotNull Pseudocode pseudocode) {
@@ -732,6 +735,13 @@ public class ClassDescriptorResolver {
             public void recordRepresentativeInstruction(@NotNull JetElement element, @NotNull Instruction instruction) {
                 Instruction oldValue = representativeInstructions.put(element, instruction);
 //                assert oldValue == null : element.getText();
+                pseudocodeTrace.recordRepresentativeInstruction(element, instruction);
+            }
+
+            @Override
+            public void recordLoopInfo(JetExpression expression, LoopInfo blockInfo) {
+                loopInfo.put(expression, blockInfo);
+                pseudocodeTrace.recordLoopInfo(expression, blockInfo);
             }
 
             @Override
@@ -762,7 +772,7 @@ public class ClassDescriptorResolver {
 
                 SubroutineEnterInstruction enterInstruction = pseudocode.getEnterInstruction();
                 Set<Instruction> visited = new HashSet<Instruction>();
-                collectReachable(enterInstruction, visited);
+                collectReachable(enterInstruction, visited, null);
 
                 for (Instruction instruction : pseudocode.getInstructions()) {
                     if (!visited.contains(instruction) &&
@@ -783,11 +793,11 @@ public class ClassDescriptorResolver {
                 SubroutineEnterInstruction enterInstruction = dominatorInstruction.getOwner().getEnterInstruction();
 
                 Set<Instruction> reachable = new HashSet<Instruction>();
-                collectReachable(enterInstruction, reachable);
+                collectReachable(enterInstruction, reachable, null);
 
                 Set<Instruction> reachableWithDominatorProhibited = new HashSet<Instruction>();
                 reachableWithDominatorProhibited.add(dominatorInstruction);
-                collectReachable(enterInstruction, reachableWithDominatorProhibited);
+                collectReachable(enterInstruction, reachableWithDominatorProhibited, null);
 
                 for (Instruction instruction : reachable) {
                     if (instruction instanceof JetElementInstruction
@@ -798,15 +808,39 @@ public class ClassDescriptorResolver {
                     }
                 }
             }
+
+            @Override
+            public boolean isBreakable(JetLoopExpression loop) {
+                LoopInfo info = loopInfo.get(loop);
+                Pseudocode.PseudocodeLabel bodyEntryPoint = (Pseudocode.PseudocodeLabel) info.getBodyEntryPoint();
+                Pseudocode.PseudocodeLabel exitPoint = (Pseudocode.PseudocodeLabel) info.getExitPoint();
+                HashSet<Instruction> visited = Sets.newHashSet();
+                Pseudocode.PseudocodeLabel conditionEntryPoint = (Pseudocode.PseudocodeLabel) info.getConditionEntryPoint();
+                visited.add(conditionEntryPoint.resolveToInstruction());
+                return collectReachable(bodyEntryPoint.resolveToInstruction(), visited, exitPoint.resolveToInstruction());
+            }
+
+            public boolean isReachable(JetExpression from, JetExpression to) {
+                Instruction fromInstr = representativeInstructions.get(from);
+                assert fromInstr != null : "No representative instruction for " + from.getText();
+                Instruction toInstr = representativeInstructions.get(to);
+                assert toInstr != null : "No representative instruction for " + to.getText();
+
+                return collectReachable(fromInstr, Sets.<Instruction>newHashSet(), toInstr);
+            }
         };
     }
 
-    private void collectReachable(Instruction current, Set<Instruction> visited) {
-        if (!visited.add(current)) return;
+    private boolean collectReachable(Instruction current, Set<Instruction> visited, @Nullable Instruction lookFor) {
+        if (!visited.add(current)) return false;
+        if (current == lookFor) return true;
 
         for (Instruction nextInstruction : current.getNextInstructions()) {
-            collectReachable(nextInstruction, visited);
+            if (collectReachable(nextInstruction, visited, lookFor)) {
+                return true;
+            }
         }
+        return false;
     }
 
     private void processPreviousInstructions(Instruction previousFor, final Set<Instruction> visited, final Collection<JetExpression> returnedExpressions, final Collection<JetElement> elementsReturningUnit) {

idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java

@@ -1307,12 +1307,16 @@ public class JetTypeInferrer {
                 }
             }
             else if (thenBranch == null) {
-                getType(scope, elseBranch, true, elseInfo);
+                JetType type = getType(scope, elseBranch, true, elseInfo);
+                if (type != null && JetStandardClasses.isNothing(type)) {
+                    resultDataFlowInfo = thenInfo;
+                }
                 result = JetStandardClasses.getUnitType();
             }
             else {
                 JetType thenType = getType(scope, thenBranch, true, thenInfo);
                 JetType elseType = getType(scope, elseBranch, true, elseInfo);
+
                 if (thenType == null) {
                     result = elseType;
                 }
@@ -1322,10 +1326,22 @@ public class JetTypeInferrer {
                 else {
                     result = semanticServices.getTypeChecker().commonSupertype(Arrays.asList(thenType, elseType));
                 }
+
+                boolean jumpInThen = thenType != null && JetStandardClasses.isNothing(thenType);
+                boolean jumpInElse = elseType != null && JetStandardClasses.isNothing(elseType);
+
+                if (jumpInThen && !jumpInElse) {
+                    resultDataFlowInfo = elseInfo;
+                }
+                else if (jumpInElse && !jumpInThen) {
+                    resultDataFlowInfo = thenInfo;
+                }
+
             }
         }
 
-        private DataFlowInfo extractDataFlowInfoFromCondition(@NotNull JetExpression condition, final boolean conditionValue) {
+        private DataFlowInfo extractDataFlowInfoFromCondition(@Nullable JetExpression condition, final boolean conditionValue) {
+            if (condition == null) return dataFlowInfo;
             final DataFlowInfo[] result = new DataFlowInfo[] {dataFlowInfo};
             condition.accept(new JetVisitor() {
                 @Override
@@ -1410,7 +1426,9 @@ public class JetTypeInferrer {
                 DataFlowInfo conditionInfo = condition == null ? dataFlowInfo : extractDataFlowInfoFromCondition(condition, true);
                 getType(scope, body, true, conditionInfo);
             }
-            resultDataFlowInfo = condition == null ? null : extractDataFlowInfoFromCondition(condition, false);
+            if (!flowInformationProvider.isBreakable(expression)) {
+                resultDataFlowInfo = extractDataFlowInfoFromCondition(condition, false);
+            }
             result = JetStandardClasses.getUnitType();
         }
 
@@ -1434,7 +1452,11 @@ public class JetTypeInferrer {
                 conditionScope = writableScope;
                 getBlockReturnedTypeWithWritableScope(writableScope, Collections.singletonList(body), dataFlowInfo);
             }
-            checkCondition(conditionScope, expression.getCondition());
+            JetExpression condition = expression.getCondition();
+            checkCondition(conditionScope, condition);
+            if (!flowInformationProvider.isBreakable(expression)) {
+                resultDataFlowInfo = extractDataFlowInfoFromCondition(condition, false);
+            }
             result = JetStandardClasses.getUnitType();
         }
 
@@ -1918,6 +1940,7 @@ public class JetTypeInferrer {
             if (receiverType != null) {
                 FunctionDescriptor functionDescriptor = lookupFunction(scope, expression, "get", receiverType, argumentTypes, true);
                 if (functionDescriptor != null) {
+//                    checkNullSafety(receiverType, expression.getIndexExpressions().get(0).getNode(), functionDescriptor);
                     result = functionDescriptor.getUnsubstitutedReturnType();
                 }
             }

idea/testData/cfg/Finally.instructions

@@ -224,26 +224,28 @@ fun t3() {
 ---------------------
 l0:
     <START>
-l3:
+l2:
+l5:
     r(true)
-    jf(l2)
-    jmp?(l4)
+    jf(l3)
+l4:
+    jmp?(l6)
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
+    jf(l7)
     r(2)
-    jmp(l2)
-    jmp(l6)
-l5:
+    jmp(l3)
+    jmp(l8)
+l7:
     read (Unit)
-l4:
 l6:
+l8:
     r(2)
-    jmp(l3)
-l2:
+    jmp(l2)
+l3:
     read (Unit)
 l1:
     <END>
@@ -268,22 +270,24 @@ fun t3() {
 l0:
     <START>
     jmp?(l2)
-l4:
+l3:
+l6:
     r(true)
-    jf(l3)
+    jf(l4)
+l5:
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
-    jmp(l3)
-    jmp(l6)
-l5:
-    read (Unit)
-l6:
+    jf(l7)
     jmp(l4)
-l3:
+    jmp(l8)
+l7:
+    read (Unit)
+l8:
+    jmp(l3)
+l4:
     read (Unit)
     r(5)
 l2:
@@ -310,22 +314,24 @@ fun t3() {
 l0:
     <START>
     jmp?(l2)
-l4:
+l3:
+l6:
     r(true)
-    jf(l3)
+    jf(l4)
+l5:
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
-    jmp(l3)
-    jmp(l6)
-l5:
-    read (Unit)
-l6:
+    jf(l7)
     jmp(l4)
-l3:
+    jmp(l8)
+l7:
+    read (Unit)
+l8:
+    jmp(l3)
+l4:
     read (Unit)
 l2:
     r(2)
@@ -354,24 +360,26 @@ l0:
     r(a)
     r(..)
     r(1..a)
-    jmp?(l2)
 l3:
-    jmp?(l4)
+    jmp?(l2)
+l4:
+l5:
+    jmp?(l6)
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
+    jf(l7)
     r(2)
-    jmp(l3)
-    jmp(l6)
-l5:
+    jmp(l4)
+    jmp(l8)
+l7:
     read (Unit)
-l4:
 l6:
+l8:
     r(2)
-    jmp?(l3)
+    jmp?(l4)
 l2:
     read (Unit)
 l1:
@@ -401,20 +409,22 @@ l0:
     r(a)
     r(..)
     r(1..a)
-    jmp?(l3)
 l4:
+    jmp?(l3)
+l5:
+l6:
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
-    jmp(l4)
-    jmp(l6)
-l5:
+    jf(l7)
+    jmp(l5)
+    jmp(l8)
+l7:
     read (Unit)
-l6:
-    jmp?(l4)
+l8:
+    jmp?(l5)
 l3:
     read (Unit)
     r(5)
@@ -446,20 +456,22 @@ l0:
     r(a)
     r(..)
     r(1..a)
-    jmp?(l3)
 l4:
+    jmp?(l3)
+l5:
+l6:
     r(1)
     r(2)
     r(3)
     r(>)
     r(2 > 3)
-    jf(l5)
-    jmp(l4)
-    jmp(l6)
-l5:
+    jf(l7)
+    jmp(l5)
+    jmp(l8)
+l7:
     read (Unit)
-l6:
-    jmp?(l4)
+l8:
+    jmp?(l5)
 l3:
     read (Unit)
 l2:

idea/testData/cfg/OnlyWhileInFunctionBody.instructions

@@ -7,15 +7,17 @@ fun main() {
 ---------------------
 l0:
     <START>
-l3:
+l2:
+l5:
     r(1)
     r(0)
     r(>)
     r(1 > 0)
-    jf(l2)
+    jf(l3)
+l4:
     r(2)
-    jmp(l3)
-l2:
+    jmp(l2)
+l3:
     read (Unit)
 l1:
     <END>
@@ -30,14 +32,16 @@ fun dowhile() {
 ---------------------
 l0:
     <START>
-l3:
+l2:
+l4:
     ret l1
+l5:
     r(1)
     r(0)
     r(>)
     r(1 > 0)
-    jt(l3)
-l2:
+    jt(l2)
+l3:
     read (Unit)
 l1:
     <END>

idea/testData/checker/Nullability.jet

@@ -139,3 +139,78 @@ fun test() {
   out.println()
 
 }
+
+
+fun f(out : String?) {
+  out?.get(0)
+  if (out != null) else return;
+  out.get(0)
+}
+
+fun f1(out : String?) {
+  out?.get(0)
+  if (out != null) else {
+    1 + 2
+    return;
+  }
+  out.get(0)
+}
+
+fun f2(out : String?) {
+  out?.get(0)
+  if (out == null) {
+    1 + 2
+    return;
+  }
+  out.get(0)
+}
+
+fun f3(out : String?) {
+  out?.get(0)
+  if (out == null) {
+    1 + 2
+    return;
+  }
+  else {
+    1 + 2
+  }
+  out.get(0)
+}
+
+fun f4(s : String?) {
+  s?.get(0)
+  while (1 < 2 && s != null) {
+    s.get(0)
+  }
+  s?.get(0)
+  while (s == null || 1 < 2) {
+     s?.get(0)
+  }
+  s.get(0)
+}
+
+fun f5(s : String?) {
+  s?.get(0)
+  while (1 < 2 && s != null) {
+    s.get(0)
+  }
+  s?.get(0)
+  while (s == null || 1 < 2) {
+    if (1 > 2) break
+     s?.get(0)
+  }
+  s?.get(0);
+}
+
+fun f6(s : String?) {
+  s?.get(0)
+  do {
+    s?.get(0)
+    if (1 < 2) break;
+  } while (s == null)
+  s?.get(0)
+  do {
+    s?.get(0)
+  } while (s == null)
+  s.get(0)
+}

idea/tests/org/jetbrains/jet/cfg/JetControlFlowTest.java

@@ -8,11 +8,13 @@ import junit.framework.Test;
 import junit.framework.TestSuite;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.JetTestCaseBase;
+import org.jetbrains.jet.lang.cfg.LoopInfo;
 import org.jetbrains.jet.lang.cfg.pseudocode.Instruction;
 import org.jetbrains.jet.lang.cfg.pseudocode.JetControlFlowDataTraceFactory;
 import org.jetbrains.jet.lang.cfg.pseudocode.JetPseudocodeTrace;
 import org.jetbrains.jet.lang.cfg.pseudocode.Pseudocode;
 import org.jetbrains.jet.lang.psi.JetElement;
+import org.jetbrains.jet.lang.psi.JetExpression;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.psi.JetNamedDeclaration;
 import org.jetbrains.jet.lang.resolve.AnalyzingUtils;
@@ -55,6 +57,10 @@ public class JetControlFlowTest extends JetTestCaseBase {
                 }
             }
 
+            @Override
+            public void recordLoopInfo(JetExpression expression, LoopInfo blockInfo) {
+            }
+
             @Override
             public void recordRepresentativeInstruction(@NotNull JetElement element, @NotNull Instruction instruction) {
             }