Examples with ExpressionTree com.sun.source.tree.ExpressionTree used on opensource projects

Example 36 with ExpressionTree

use of com.sun.source.tree.ExpressionTree in project error-prone by google.

the class UTemplater method visitMethodInvocation.

@Override
public UExpression visitMethodInvocation(MethodInvocationTree tree, Void v) {
    if (anyMatch(ANY_OF, tree.getMethodSelect(), new Unifier(context))) {
        return UAnyOf.create(templateExpressions(tree.getArguments()));
    } else if (anyMatch(IS_INSTANCE, tree.getMethodSelect(), new Unifier(context))) {
        return UInstanceOf.create(template(Iterables.getOnlyElement(tree.getArguments())), templateType(getSingleExplicitTypeArgument(tree)));
    } else if (anyMatch(CLAZZ, tree.getMethodSelect(), new Unifier(context))) {
        Tree typeArg = getSingleExplicitTypeArgument(tree);
        return UMemberSelect.create(templateType(typeArg), "class", UClassType.create("java.lang.Class", template(((JCTree) typeArg).type)));
    } else if (anyMatch(NEW_ARRAY, tree.getMethodSelect(), new Unifier(context))) {
        Tree typeArg = getSingleExplicitTypeArgument(tree);
        ExpressionTree lengthArg = Iterables.getOnlyElement(tree.getArguments());
        return UNewArray.create(templateType(typeArg), ImmutableList.of(template(lengthArg)), null);
    } else if (anyMatch(ENUM_VALUE_OF, tree.getMethodSelect(), new Unifier(context))) {
        Tree typeArg = getSingleExplicitTypeArgument(tree);
        ExpressionTree strArg = Iterables.getOnlyElement(tree.getArguments());
        return UMethodInvocation.create(UMemberSelect.create(templateType(typeArg), "valueOf", UMethodType.create(template(((JCTree) typeArg).type), UClassType.create("java.lang.String"))), template(strArg));
    } else if (anyMatch(AS_VARARGS, tree.getMethodSelect(), new Unifier(context))) {
        ExpressionTree arg = Iterables.getOnlyElement(tree.getArguments());
        checkArgument(ASTHelpers.hasAnnotation(arg, Repeated.class, new VisitorState(context)));
        return template(arg);
    }
    Map<MethodSymbol, PlaceholderMethod> placeholderMethods = context.get(RefasterRuleBuilderScanner.PLACEHOLDER_METHODS_KEY);
    if (placeholderMethods != null && placeholderMethods.containsKey(ASTHelpers.getSymbol(tree))) {
        return UPlaceholderExpression.create(placeholderMethods.get(ASTHelpers.getSymbol(tree)), templateExpressions(tree.getArguments()));
    } else {
        return UMethodInvocation.create(template(tree.getMethodSelect()), templateExpressions(tree.getArguments()));
    }
}

Example 37 with ExpressionTree

use of com.sun.source.tree.ExpressionTree in project error-prone by google.

the class UTemplater method createTemplate.

/**
   * Returns a template based on a method. One-line methods starting with a {@code return} statement
   * are guessed to be expression templates, and all other methods are guessed to be block
   * templates.
   */
public static Template<?> createTemplate(Context context, MethodTree decl) {
    MethodSymbol declSym = ASTHelpers.getSymbol(decl);
    ImmutableClassToInstanceMap<Annotation> annotations = UTemplater.annotationMap(declSym);
    ImmutableMap<String, VarSymbol> freeExpressionVars = freeExpressionVariables(decl);
    Context subContext = new SubContext(context);
    final UTemplater templater = new UTemplater(freeExpressionVars, subContext);
    ImmutableMap<String, UType> expressionVarTypes = ImmutableMap.copyOf(Maps.transformValues(freeExpressionVars, new Function<VarSymbol, UType>() {

        @Override
        public UType apply(VarSymbol sym) {
            return templater.template(sym.type);
        }
    }));
    UType genericType = templater.template(declSym.type);
    List<UTypeVar> typeParameters;
    UMethodType methodType;
    if (genericType instanceof UForAll) {
        UForAll forAllType = (UForAll) genericType;
        typeParameters = forAllType.getTypeVars();
        methodType = (UMethodType) forAllType.getQuantifiedType();
    } else if (genericType instanceof UMethodType) {
        typeParameters = ImmutableList.of();
        methodType = (UMethodType) genericType;
    } else {
        throw new IllegalArgumentException("Expected genericType to be either a ForAll or a UMethodType, but was " + genericType);
    }
    List<? extends StatementTree> bodyStatements = decl.getBody().getStatements();
    if (bodyStatements.size() == 1 && Iterables.getOnlyElement(bodyStatements).getKind() == Kind.RETURN && context.get(REQUIRE_BLOCK_KEY) == null) {
        ExpressionTree expression = ((ReturnTree) Iterables.getOnlyElement(bodyStatements)).getExpression();
        return ExpressionTemplate.create(annotations, typeParameters, expressionVarTypes, templater.template(expression), methodType.getReturnType());
    } else {
        List<UStatement> templateStatements = new ArrayList<>();
        for (StatementTree statement : bodyStatements) {
            templateStatements.add(templater.template(statement));
        }
        return BlockTemplate.create(annotations, typeParameters, expressionVarTypes, templateStatements);
    }
}

Example 38 with ExpressionTree

use of com.sun.source.tree.ExpressionTree in project error-prone by google.

the class CompileTimeConstantExpressionMatcherTest method assertCompilerMatchesOnAssignment.

// Helper methods.
private void assertCompilerMatchesOnAssignment(final Map<String, Boolean> expectedMatches, String... lines) {
    final Matcher<ExpressionTree> matcher = new CompileTimeConstantExpressionMatcher();
    final Scanner scanner = new Scanner() {

        @Override
        public Void visitAssignment(AssignmentTree t, VisitorState state) {
            ExpressionTree lhs = t.getVariable();
            if (expectedMatches.containsKey(lhs.toString())) {
                boolean matches = matcher.matches(t.getExpression(), state);
                if (expectedMatches.get(lhs.toString())) {
                    assertTrue("Matcher should match expression" + t.getExpression(), matches);
                } else {
                    assertFalse("Matcher should not match expression" + t.getExpression(), matches);
                }
            }
            return super.visitAssignment(t, state);
        }
    };
    CompilationTestHelper.newInstance(ScannerSupplier.fromScanner(scanner), getClass()).expectResult(Result.OK).addSourceLines("test/CompileTimeConstantExpressionMatcherTestCase.java", lines).doTest();
}

Example 39 with ExpressionTree

use of com.sun.source.tree.ExpressionTree in project groovy-cps by cloudbees.

the class Translator method translateMethod.

/**
     * @param e
     *      Method in {@code fqcn} to translate.
     */
private void translateMethod(final CompilationUnitTree cut, ExecutableElement e, JDefinedClass $output, String fqcn, String overloadResolved) {
    String methodName = n(e);
    boolean isPublic = e.getModifiers().contains(Modifier.PUBLIC);
    JMethod delegating = $output.method(isPublic ? JMod.PUBLIC | JMod.STATIC : JMod.STATIC, (JType) null, methodName);
    JMethod m = $output.method(JMod.PRIVATE | JMod.STATIC, (JType) null, overloadResolved);
    Map<String, JTypeVar> typeVars = new HashMap<>();
    e.getTypeParameters().forEach(p -> {
        String name = n(p);
        JTypeVar typeVar = delegating.generify(name);
        JTypeVar typeVar2 = m.generify(name);
        p.getBounds().forEach(b -> {
            JClass binding = (JClass) t(b, typeVars);
            typeVar.bound(binding);
            typeVar2.bound(binding);
        });
        typeVars.put(name, typeVar);
    });
    JType type = t(e.getReturnType(), typeVars);
    delegating.type(type);
    m.type(type);
    List<JVar> delegatingParams = new ArrayList<>();
    List<JVar> params = new ArrayList<>();
    e.getParameters().forEach(p -> {
        JType paramType = t(p.asType(), typeVars);
        delegatingParams.add(e.isVarArgs() && p == e.getParameters().get(e.getParameters().size() - 1) ? delegating.varParam(paramType.elementType(), n(p)) : delegating.param(paramType, n(p)));
        params.add(m.param(paramType, n(p)));
    });
    e.getThrownTypes().forEach(ex -> {
        delegating._throws((JClass) t(ex));
        m._throws((JClass) t(ex));
    });
    boolean returnsVoid = e.getReturnType().getKind() == TypeKind.VOID;
    if (isPublic) {
        // preamble
        /*
                If the call to this method happen outside CPS code, execute normally via DefaultGroovyMethods
             */
        delegating.body()._if(JOp.cand(JOp.not($Caller.staticInvoke("isAsynchronous").tap(inv -> {
            inv.arg(delegatingParams.get(0));
            inv.arg(methodName);
            for (int i = 1; i < delegatingParams.size(); i++) inv.arg(delegatingParams.get(i));
        })), JOp.not($Caller.staticInvoke("isAsynchronous").arg($output.dotclass()).arg(methodName).args(params))))._then().tap(blk -> {
            JClass $WhateverGroovyMethods = codeModel.ref(fqcn);
            JInvocation forward = $WhateverGroovyMethods.staticInvoke(methodName).args(delegatingParams);
            if (returnsVoid) {
                blk.add(forward);
                blk._return();
            } else {
                blk._return(forward);
            }
        });
    }
    JInvocation delegateCall = $output.staticInvoke(overloadResolved);
    if (returnsVoid) {
        delegating.body().add(delegateCall);
    } else {
        delegating.body()._return(delegateCall);
    }
    delegatingParams.forEach(p -> delegateCall.arg(p));
    JVar $b = m.body().decl($Builder, "b", JExpr._new($Builder).arg(JExpr.invoke("loc").arg(methodName)));
    JInvocation f = JExpr._new($CpsFunction);
    // parameter names
    f.arg(codeModel.ref(Arrays.class).staticInvoke("asList").tap(inv -> {
        e.getParameters().forEach(p -> inv.arg(n(p)));
    }));
    // translate the method body into an expression that invokes Builder
    f.arg(trees.getTree(e).getBody().accept(new SimpleTreeVisitor<JExpression, Void>() {

        private JExpression visit(Tree t) {
            if (t == null)
                return JExpr._null();
            return visit(t, null);
        }

        /**
             * Maps a symbol to its source location.
             */
        private JExpression loc(Tree t) {
            long pos = trees.getSourcePositions().getStartPosition(cut, t);
            return JExpr.lit((int) cut.getLineMap().getLineNumber(pos));
        }

        @Override
        public JExpression visitWhileLoop(WhileLoopTree wt, Void __) {
            return $b.invoke("while_").arg(// TODO: label
            JExpr._null()).arg(visit(wt.getCondition())).arg(visit(wt.getStatement()));
        }

        @Override
        public JExpression visitMethodInvocation(MethodInvocationTree mt, Void __) {
            ExpressionTree ms = mt.getMethodSelect();
            JInvocation inv;
            if (ms instanceof MemberSelectTree) {
                MemberSelectTree mst = (MemberSelectTree) ms;
                inv = $b.invoke("functionCall").arg(loc(mt)).arg(visit(mst.getExpression())).arg(n(mst.getIdentifier()));
            } else if (ms instanceof JCIdent) {
                // invocation without object selection, like  foo(bar,zot)
                JCIdent it = (JCIdent) ms;
                if (!it.sym.owner.toString().equals(fqcn)) {
                    // static import
                    inv = $b.invoke("functionCall").arg(loc(mt)).arg($b.invoke("constant").arg(t(it.sym.owner.type).dotclass())).arg(n(it));
                } else {
                    // invocation on this class
                    String overloadResolved = mangledName((Symbol.MethodSymbol) it.sym);
                    Optional<? extends Element> callSite = elements.getTypeElement(fqcn).getEnclosedElements().stream().filter(e -> e.getKind() == ElementKind.METHOD && mangledName((ExecutableElement) e).equals(overloadResolved)).findAny();
                    if (callSite.isPresent()) {
                        ExecutableElement e = (ExecutableElement) callSite.get();
                        if (e.getModifiers().contains(Modifier.PUBLIC) && !e.isVarArgs() && !e.getParameters().stream().anyMatch(p -> types.isAssignable(p.asType(), closureType))) {
                            // Delegate to the standard version.
                            inv = $b.invoke("staticCall").arg(loc(mt)).arg(t(it.sym.owner.type).dotclass()).arg(n(e));
                        } else if (overloadsResolved.containsKey(overloadResolved)) {
                            // Private, so delegate to our mangled version.
                            inv = $b.invoke("staticCall").arg(loc(mt)).arg($output.dotclass()).arg(overloadResolved);
                        } else {
                            throw new IllegalStateException("Not yet translating a " + e.getModifiers() + " method; translatable.txt might need to include: " + fqcn + "." + e);
                        }
                    } else {
                        throw new IllegalStateException("Could not find self-call site " + overloadResolved + " for " + mt);
                    }
                }
            } else {
                // TODO: figure out what can come here
                throw new UnsupportedOperationException(ms.toString());
            }
            mt.getArguments().forEach(a -> inv.arg(visit(a)));
            return inv;
        }

        @Override
        public JExpression visitVariable(VariableTree vt, Void __) {
            return $b.invoke("declareVariable").arg(loc(vt)).arg(erasure(vt).dotclass()).arg(n(vt)).arg(visit(vt.getInitializer()));
        }

        @Override
        public JExpression visitIdentifier(IdentifierTree it, Void __) {
            JCIdent idt = (JCIdent) it;
            return idt.sym.accept(new DefaultSymbolVisitor<JExpression, Void>() {

                @Override
                public JExpression visitClassSymbol(ClassSymbol cs, Void __) {
                    return $b.invoke("constant").arg(t(cs.asType()).dotclass());
                }

                @Override
                public JExpression visitVarSymbol(VarSymbol s, Void __) {
                    return $b.invoke("localVariable").arg(n(s.name));
                }

                @Override
                public JExpression visitSymbol(Symbol s, Void __) {
                    throw new UnsupportedOperationException(s.toString());
                }
            }, __);
        }

        @Override
        public JExpression visitBlock(BlockTree bt, Void __) {
            JInvocation inv = $b.invoke("block");
            bt.getStatements().forEach(s -> inv.arg(visit(s)));
            return inv;
        }

        @Override
        public JExpression visitReturn(ReturnTree rt, Void __) {
            return $b.invoke("return_").arg(visit(rt.getExpression()));
        }

        /**
             * When used outside {@link MethodInvocationTree}, this is property access.
             */
        @Override
        public JExpression visitMemberSelect(MemberSelectTree mt, Void __) {
            return $b.invoke("property").arg(loc(mt)).arg(visit(mt.getExpression())).arg(n(mt.getIdentifier()));
        }

        @Override
        public JExpression visitTypeCast(TypeCastTree tt, Void __) {
            return $b.invoke("cast").arg(loc(tt)).arg(visit(tt.getExpression())).arg(erasure(tt.getType()).dotclass()).arg(JExpr.lit(false));
        }

        @Override
        public JExpression visitIf(IfTree it, Void __) {
            JInvocation inv = $b.invoke("if_").arg(visit(it.getCondition())).arg(visit(it.getThenStatement()));
            if (it.getElseStatement() != null)
                inv.arg(visit(it.getElseStatement()));
            return inv;
        }

        @Override
        public JExpression visitNewClass(NewClassTree nt, Void __) {
            // TODO: outer class
            if (nt.getEnclosingExpression() != null)
                throw new UnsupportedOperationException();
            return $b.invoke("new_").tap(inv -> {
                inv.arg(loc(nt));
                inv.arg(t(((JCTree) nt).type).dotclass());
                nt.getArguments().forEach(et -> inv.arg(visit(et)));
            });
        }

        @Override
        public JExpression visitExpressionStatement(ExpressionStatementTree et, Void __) {
            return visit(et.getExpression());
        }

        @Override
        public JExpression visitLiteral(LiteralTree lt, Void __) {
            return $b.invoke("constant").arg(JExpr.literal(lt.getValue()));
        }

        @Override
        public JExpression visitParenthesized(ParenthesizedTree pt, Void __) {
            return visit(pt.getExpression());
        }

        @Override
        public JExpression visitBinary(BinaryTree bt, Void __) {
            return $b.invoke(opName(bt.getKind())).arg(loc(bt)).arg(visit(bt.getLeftOperand())).arg(visit(bt.getRightOperand()));
        }

        @Override
        public JExpression visitUnary(UnaryTree ut, Void __) {
            return $b.invoke(opName(ut.getKind())).arg(loc(ut)).arg(visit(ut.getExpression()));
        }

        @Override
        public JExpression visitCompoundAssignment(CompoundAssignmentTree ct, Void __) {
            return $b.invoke(opName(ct.getKind())).arg(loc(ct)).arg(visit(ct.getVariable())).arg(visit(ct.getExpression()));
        }

        private String opName(Kind kind) {
            switch(kind) {
                case EQUAL_TO:
                    return "compareEqual";
                case NOT_EQUAL_TO:
                    return "compareNotEqual";
                case LESS_THAN_EQUAL:
                    return "lessThanEqual";
                case LESS_THAN:
                    return "lessThan";
                case GREATER_THAN_EQUAL:
                    return "greaterThanEqual";
                case GREATER_THAN:
                    return "greaterThan";
                case PREFIX_INCREMENT:
                    return "prefixInc";
                case POSTFIX_INCREMENT:
                    return "postfixInc";
                case POSTFIX_DECREMENT:
                    return "postfixDec";
                case LOGICAL_COMPLEMENT:
                    return "not";
                case CONDITIONAL_OR:
                    return "logicalOr";
                case CONDITIONAL_AND:
                    return "logicalAnd";
                case PLUS:
                    return "plus";
                case PLUS_ASSIGNMENT:
                    return "plusEqual";
                case MINUS:
                    return "minus";
                case MINUS_ASSIGNMENT:
                    return "minusEqual";
            }
            throw new UnsupportedOperationException(kind.toString());
        }

        @Override
        public JExpression visitAssignment(AssignmentTree at, Void __) {
            return $b.invoke("assign").arg(loc(at)).arg(visit(at.getVariable())).arg(visit(at.getExpression()));
        }

        @Override
        public JExpression visitNewArray(NewArrayTree nt, Void __) {
            if (nt.getInitializers() != null) {
                return $b.invoke("newArrayFromInitializers").tap(inv -> {
                    nt.getInitializers().forEach(d -> inv.arg(visit(d)));
                });
            } else {
                return $b.invoke("newArray").tap(inv -> {
                    inv.arg(loc(nt));
                    inv.arg(t(nt.getType()).dotclass());
                    nt.getDimensions().forEach(d -> inv.arg(visit(d)));
                });
            }
        }

        @Override
        public JExpression visitForLoop(ForLoopTree ft, Void __) {
            return $b.invoke("forLoop").arg(JExpr._null()).arg($b.invoke("sequence").tap(inv -> ft.getInitializer().forEach(i -> inv.arg(visit(i))))).arg(visit(ft.getCondition())).arg($b.invoke("sequence").tap(inv -> ft.getUpdate().forEach(i -> inv.arg(visit(i))))).arg(visit(ft.getStatement()));
        }

        @Override
        public JExpression visitEnhancedForLoop(EnhancedForLoopTree et, Void __) {
            return $b.invoke("forInLoop").arg(loc(et)).arg(JExpr._null()).arg(erasure(et.getVariable()).dotclass()).arg(n(et.getVariable())).arg(visit(et.getExpression())).arg(visit(et.getStatement()));
        }

        @Override
        public JExpression visitArrayAccess(ArrayAccessTree at, Void __) {
            return $b.invoke("array").arg(loc(at)).arg(visit(at.getExpression())).arg(visit(at.getIndex()));
        }

        @Override
        public JExpression visitBreak(BreakTree node, Void __) {
            if (node.getLabel() != null)
                throw new UnsupportedOperationException();
            return $b.invoke("break_").arg(JExpr._null());
        }

        @Override
        public JExpression visitContinue(ContinueTree node, Void aVoid) {
            if (node.getLabel() != null)
                throw new UnsupportedOperationException();
            return $b.invoke("continue_").arg(JExpr._null());
        }

        @Override
        public JExpression visitInstanceOf(InstanceOfTree it, Void __) {
            return $b.invoke("instanceOf").arg(loc(it)).arg(visit(it.getExpression())).arg($b.invoke("constant").arg(t(it.getType()).dotclass()));
        }

        @Override
        public JExpression visitThrow(ThrowTree tt, Void __) {
            return $b.invoke("throw_").arg(loc(tt)).arg(visit(tt.getExpression()));
        }

        @Override
        public JExpression visitDoWhileLoop(DoWhileLoopTree dt, Void __) {
            return $b.invoke("doWhile").arg(JExpr._null()).arg(visit(dt.getStatement())).arg(visit(dt.getCondition()));
        }

        @Override
        public JExpression visitConditionalExpression(ConditionalExpressionTree ct, Void __) {
            return $b.invoke("ternaryOp").arg(visit(ct.getCondition())).arg(visit(ct.getTrueExpression())).arg(visit(ct.getFalseExpression()));
        }

        @Override
        public JExpression visitTry(TryTree tt, Void __) {
            return $b.invoke("tryCatch").arg(visit(tt.getBlock())).arg(visit(tt.getFinallyBlock())).tap(inv -> tt.getCatches().forEach(ct -> JExpr._new($CatchExpression).arg(t(ct.getParameter()).dotclass()).arg(n(ct.getParameter())).arg(visit(ct.getBlock()))));
        }

        @Override
        protected JExpression defaultAction(Tree node, Void aVoid) {
            throw new UnsupportedOperationException(node.toString());
        }
    }, null));
    JVar $f = m.body().decl($CpsFunction, "f", f);
    m.body()._throw(JExpr._new($CpsCallableInvocation).arg($f).arg(JExpr._null()).args(params));
}

Example 40 with ExpressionTree

use of com.sun.source.tree.ExpressionTree in project error-prone by google.

the class DataFlow method expressionDataflow.

/**
   * Run the {@code transfer} dataflow analysis to compute the abstract value of the expression
   * which is the leaf of {@code exprPath}.
   *
   * @return dataflow result for the given expression or {@code null} if the expression is not
   *     part of a method or lambda
   */
@Nullable
public static <A extends AbstractValue<A>, S extends Store<S>, T extends TransferFunction<A, S>> A expressionDataflow(TreePath exprPath, Context context, T transfer) {
    final Tree leaf = exprPath.getLeaf();
    Preconditions.checkArgument(leaf instanceof ExpressionTree, "Leaf of exprPath must be of type ExpressionTree, but was %s", leaf.getClass().getName());
    final ExpressionTree expr = (ExpressionTree) leaf;
    final TreePath enclosingMethodPath = findEnclosingMethodOrLambda(exprPath);
    if (enclosingMethodPath == null) {
        // Currently not supported because it only happens in ~2% of cases.
        return null;
    }
    final Tree method = enclosingMethodPath.getLeaf();
    if (method instanceof MethodTree && ((MethodTree) method).getBody() == null) {
        //   abstract Set<Map.Entry<K, V>> entries();
        return null;
    }
    return methodDataflow(enclosingMethodPath, context, transfer).getAnalysis().getValue(expr);
}