refactored conditional jump generation to enable and/or generation

idea/src/org/jetbrains/jet/codegen/ExpressionCodegen.java

@@ -86,18 +86,20 @@ public class ExpressionCodegen extends JetVisitor {
         }
 
         if (thenExpression == null) {
-            generateSingleBranchIf(elseExpression, false);
+            generateSingleBranchIf(elseExpression, true);
             return;
         }
 
         if (elseExpression == null) {
-            generateSingleBranchIf(thenExpression, true);
+            generateSingleBranchIf(thenExpression, false);
             return;
         }
 
 
+        Label thenLabel = new Label();
         Label elseLabel = new Label();
-        myStack.pop().condJump(elseLabel, true, v);   // == 0, i.e. false
+        myStack.pop().condJump(thenLabel, elseLabel, v);
+        v.mark(thenLabel);
 
         gen(thenExpression, asmType);
 
@@ -123,7 +125,9 @@ public class ExpressionCodegen extends JetVisitor {
         myLoopEnds.push(end);
 
         gen(expression.getCondition());
-        myStack.pop().condJump(end, true, v);
+        Label thenLabel = new Label();
+        myStack.pop().condJump(thenLabel, end, v);
+        v.mark(thenLabel);
 
         gen(expression.getBody(), Type.VOID_TYPE);
         v.goTo(condition);
@@ -145,7 +149,7 @@ public class ExpressionCodegen extends JetVisitor {
         gen(expression.getBody(), Type.VOID_TYPE);
 
         gen(expression.getCondition());
-        myStack.pop().condJump(condition, false, v);
+        myStack.pop().condJump(condition, end, v);
 
         v.mark(end);
 
@@ -176,13 +180,15 @@ public class ExpressionCodegen extends JetVisitor {
     }
 
     private void generateSingleBranchIf(JetExpression expression, boolean inverse) {
-        Label endLabel = new Label();
+        Label ifTrue = new Label();
+        Label ifFalse = new Label();
 
-        myStack.pop().condJump(endLabel, inverse, v);
+        myStack.pop().condJump(inverse ? ifFalse : ifTrue, inverse ? ifTrue : ifFalse, v);
+        v.mark(ifTrue);
 
         gen(expression, Type.VOID_TYPE);
 
-        v.mark(endLabel);
+        v.mark(ifFalse);
     }
 
     @Override
@@ -497,12 +503,14 @@ public class ExpressionCodegen extends JetVisitor {
         final IElementType opToken = expression.getOperationReference().getReferencedNameElementType();
         if (opToken == JetTokens.EQ) {
             generateAssignmentExpression(expression);
-            return;
         }
-        if (JetTokens.AUGMENTED_ASSIGNMENTS.contains(opToken)) {
+        else if (JetTokens.AUGMENTED_ASSIGNMENTS.contains(opToken)) {
             generateAugmentedAssignment(expression);
-            return;
         }
+        else if (opToken == JetTokens.ANDAND) {
+            generateBooleanExpression(expression);
+        }
+        else {
             DeclarationDescriptor op = bindingContext.resolveReferenceExpression(expression.getOperationReference());
             if (op instanceof FunctionDescriptor) {
                 JetType returnType = bindingContext.getExpressionType(expression);
@@ -534,6 +542,11 @@ public class ExpressionCodegen extends JetVisitor {
             }
             throw new UnsupportedOperationException("Don't know how to generate binary op " + expression);
         }
+    }
+
+    private void generateBooleanExpression(JetBinaryExpression expression) {
+        throw new UnsupportedOperationException();
+    }
 
     private static boolean isNumberPrimitive(DeclarationDescriptor descriptor) {
         if (!(descriptor instanceof ClassDescriptor)) {
@@ -594,7 +607,7 @@ public class ExpressionCodegen extends JetVisitor {
     private void generateCompareOp(JetBinaryExpression expression, IElementType opToken, Type type) {
         gen(expression.getLeft(), type);
         gen(expression.getRight(), type);
-        myStack.push(StackValue.cmp(opToken));
+        myStack.push(StackValue.cmp(opToken, type));
     }
 
     private void generateAssignmentExpression(JetBinaryExpression expression) {

idea/src/org/jetbrains/jet/codegen/StackValue.java

@@ -32,15 +32,15 @@ public abstract class StackValue {
         return new Constant(value, type);
     }
 
-    public static StackValue cmp(IElementType opToken) {
-        return new NumberCompare(opToken);
+    public static StackValue cmp(IElementType opToken, Type operandType) {
+        return new NumberCompare(opToken, operandType);
     }
 
     public static StackValue not(StackValue stackValue) {
         return new Invert(stackValue);
     }
 
-    public abstract void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v);
+    public abstract void condJump(Label jumpIfTrue, Label jumpIfFalse, InstructionAdapter v);
 
     private static void box(final Type type, InstructionAdapter v) {
         if (type == Type.INT_TYPE) {
@@ -80,8 +80,10 @@ public abstract class StackValue {
 
     protected void putAsBoolean(InstructionAdapter v) {
         Label ifTrue = new Label();
+        Label ifFalse = new Label();
         Label end = new Label();
-        condJump(ifTrue, false, v);
+        condJump(ifTrue, ifFalse, v);
+        v.mark(ifFalse);
         v.iconst(0);
         v.goTo(end);
         v.mark(ifTrue);
@@ -105,14 +107,11 @@ public abstract class StackValue {
         }
 
         @Override
-        public void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v) {
+        public void condJump(Label ifTrue, Label ifFalse, InstructionAdapter v) {
             put(Type.INT_TYPE, v);
-            if (jumpIfFalse) {
-                v.ifeq(label);
-            }
-            else {
-                v.ifne(label);
-            }
+            // TODO optimize extra jump away
+            v.ifne(ifTrue);
+            v.goTo(ifFalse);
         }
     }
 
@@ -127,14 +126,11 @@ public abstract class StackValue {
         }
 
         @Override
-        public void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v) {
+        public void condJump(Label ifTrue, Label ifFalse, InstructionAdapter v) {
             if (this.type == Type.BOOLEAN_TYPE) {
-                if (jumpIfFalse) {
-                    v.ifeq(label);
-                }
-                else {
-                    v.ifne(label);
-                }
+                // TODO optimize extra jump away
+                v.ifne(ifTrue);
+                v.goTo(ifFalse);
             }
             else {
                 throw new UnsupportedOperationException("can't generate a cond jump for a non-boolean value on stack");
@@ -157,12 +153,10 @@ public abstract class StackValue {
         }
 
         @Override
-        public void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v) {
+        public void condJump(Label ifTrue, Label ifFalse, InstructionAdapter v) {
             if (value instanceof Boolean) {
                 boolean boolValue = ((Boolean) value).booleanValue();
-                if (boolValue ^ jumpIfFalse) {
-                    v.goTo(label);
-                }
+                v.goTo(boolValue ? ifTrue : ifFalse);
             }
             else {
                 throw new UnsupportedOperationException("don't know how to generate this condjump");
@@ -172,10 +166,12 @@ public abstract class StackValue {
 
     private static class NumberCompare extends StackValue {
         private final IElementType opToken;
+        private final Type operandType;
 
-        public NumberCompare(IElementType opToken) {
+        public NumberCompare(IElementType opToken, Type operandType) {
             super(Type.BOOLEAN_TYPE);
             this.opToken = opToken;
+            this.operandType = operandType;
         }
 
         @Override
@@ -187,44 +183,33 @@ public abstract class StackValue {
         }
 
         @Override
-        public void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v) {
+        public void condJump(Label ifTrue, Label ifFalse, InstructionAdapter v) {
             int opcode;
-            if (opToken == JetTokens.EQEQ) {
-                opcode = jumpIfFalse ? Opcodes.IFNE : Opcodes.IFEQ;
-            }
-            else if (opToken == JetTokens.EXCLEQ) {
-                opcode = jumpIfFalse ? Opcodes.IFEQ : Opcodes.IFNE;
-            }
-            else if (opToken == JetTokens.GT) {
-                opcode = jumpIfFalse ? Opcodes.IFLE : Opcodes.IFGT;
-            }
-            else if (opToken == JetTokens.GTEQ) {
-                opcode = jumpIfFalse ? Opcodes.IFLT : Opcodes.IFGE;
-            }
-            else if (opToken == JetTokens.LT) {
-                opcode = jumpIfFalse ? Opcodes.IFGE : Opcodes.IFLT;
-            }
-            else if (opToken == JetTokens.LTEQ) {
-                opcode = jumpIfFalse ? Opcodes.IFGT : Opcodes.IFLE;
-            }
+            if (opToken == JetTokens.EQEQ) opcode = Opcodes.IFEQ;
+            else if (opToken == JetTokens.EXCLEQ) opcode = Opcodes.IFNE;
+            else if (opToken == JetTokens.GT) opcode = Opcodes.IFGT;
+            else if (opToken == JetTokens.GTEQ) opcode = Opcodes.IFGE;
+            else if (opToken == JetTokens.LT) opcode = Opcodes.IFLT;
+            else if (opToken == JetTokens.LTEQ) opcode = Opcodes.IFLE;
             else {
                 throw new UnsupportedOperationException("don't know how to generate this condjump");
             }
-            if (type == Type.FLOAT_TYPE || type == Type.DOUBLE_TYPE) {
+            if (operandType == Type.FLOAT_TYPE || operandType == Type.DOUBLE_TYPE) {
                 if (opToken == JetTokens.GT || opToken == JetTokens.GTEQ) {
-                    v.cmpg(type);
+                    v.cmpg(operandType);
                 }
                 else {
-                    v.cmpl(type);
+                    v.cmpl(operandType);
                 }
             }
-            else if (type == Type.LONG_TYPE) {
+            else if (operandType == Type.LONG_TYPE) {
                 v.lcmp();
             }
             else {
                 opcode += (Opcodes.IF_ICMPEQ - Opcodes.IFEQ);
             }
-            v.visitJumpInsn(opcode, label);
+            v.visitJumpInsn(opcode, ifTrue);
+            v.goTo(ifFalse);
         }
     }
 
@@ -245,8 +230,8 @@ public abstract class StackValue {
         }
 
         @Override
-        public void condJump(Label label, boolean jumpIfFalse, InstructionAdapter v) {
-            myOperand.condJump(label, !jumpIfFalse, v);
+        public void condJump(Label ifTrue, Label ifFalse, InstructionAdapter v) {
+            myOperand.condJump(ifFalse, ifTrue, v);
         }
     }
 }

idea/testData/codegen/if.jet

-fun foo(b: Boolean): Int { return if (b) 15 else 20 }
\ No newline at end of file

idea/testData/codegen/singleBranchIf.jet

-fun foo(b: Boolean) : Int {
-  if (b) return 15;
-  return 20;
-}

idea/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java

@@ -109,7 +109,7 @@ public class NamespaceGenTest extends LightCodeInsightFixtureTestCase {
     }
 
     public void testIf() throws Exception {
-        loadFile("if.jet");
+        loadText("fun foo(b: Boolean): Int { return if (b) 15 else 20 }");
 
         System.out.println(generateToText());
         final Method main = generateFunction();
@@ -118,7 +118,7 @@ public class NamespaceGenTest extends LightCodeInsightFixtureTestCase {
     }
 
     public void testSingleBranchIf() throws Exception {
-        loadFile("singleBranchIf.jet");
+        loadText("fun foo(b: Boolean) : Int { if (b) return 15;\n return 20; }");
 
         System.out.println(generateToText());
         final Method main = generateFunction();
@@ -451,6 +451,21 @@ public class NamespaceGenTest extends LightCodeInsightFixtureTestCase {
         assertEquals(0, main.invoke(null, 4));
     }
 
+    public void _testAnd() throws Exception {
+        loadText("fun foo(a : Int): Boolean = a > 0 && a/0 > 0");
+        final Method main = generateFunction();
+        assertEquals(false, main.invoke(null, 0));
+        boolean hadException = false;
+        try {
+            main.invoke(null, 5);
+        } catch (InvocationTargetException e) {
+            if (e.getTargetException() instanceof ArithmeticException) {
+                hadException = true;
+            }
+        }
+        assertTrue(hadException);
+    }
+
     private void binOpTest(final String text, final Object arg1, final Object arg2, final Object expected) throws Exception {
         loadText(text);
         System.out.println(generateToText());