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

Example 1 with WhileLoopTree

use of com.sun.source.tree.WhileLoopTree 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($Builder).arg(JExpr.invoke("loc").arg(methodName)).invoke("contextualize").arg(codeModel.ref("com.cloudbees.groovy.cps.sandbox.Trusted").staticRef("INSTANCE")));
    JInvocation f = JExpr._new($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;
                // of the other known translated classes.
                if (mst.getExpression() instanceof JCIdent && !((JCIdent) mst.getExpression()).sym.toString().equals(fqcn) && otherTranslated.containsKey(((JCIdent) mst.getExpression()).sym.toString())) {
                    inv = $b.invoke("functionCall").arg(loc(mt)).arg($b.invoke("constant").arg(otherTranslated.get(((JCIdent) mst.getExpression()).sym.toString()).dotclass())).arg(n(mst.getIdentifier()));
                } else {
                    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)) {
                    if (otherTranslated.containsKey(it.sym.owner.toString())) {
                        // static import from transformed class
                        inv = $b.invoke("functionCall").arg(loc(mt)).arg($b.invoke("constant").arg(otherTranslated.get(it.sym.owner.toString()).dotclass())).arg(n(it));
                    } else {
                        // static import from non-transformed class
                        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 = $b.invoke("staticCall").arg(loc(mt)).arg(t(it.sym.owner.type).dotclass()).arg(n(e));
                        } else if (overloadsResolved.containsKey(overloadResolved)) {
                            // Private, so delegate to our mangled version.
                            // TODO add a String parameter to each internal helper method for the expected methodName to pass to CpsCallableInvocation.<init>
                            // (It could be improved to take a parameter for the name under which we expect methodCall to be invoking it.
                            // Usually just `each`, but might be `$each__java_util_Iterable__groovy_lang_Closure` for the case that one DGM method is delegating to another.
                            // See comment in ContinuationGroup, where we are unable to enforce continuation name mismatches in this case.)
                            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(cpsTypeTranslation(erasure(vt))).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(cpsTypeTranslation(t(((JCTree) nt).type)));
                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()));
        }

        /**
         * This is needed to handle cases like {@code Object[].class}.
         */
        @Override
        public JExpression visitArrayType(ArrayTypeTree at, Void __) {
            if (at.getType() instanceof IdentifierTree) {
                return visitIdentifier((IdentifierTree) at.getType(), __);
            } else {
                return defaultAction(at, __);
            }
        }

        @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($CpsCallableInvocation).arg(JExpr.lit(methodName)).arg($f).arg(JExpr._null()).args(params));
}

Example 2 with WhileLoopTree

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

the class ThreadJoinLoop method matchMethodInvocation.

@Override
public Description matchMethodInvocation(MethodInvocationTree methodInvocationTree, VisitorState visitorState) {
    String threadString;
    if (methodInvocationTree.getMethodSelect() instanceof MemberSelectTree) {
        threadString = ((MemberSelectTree) methodInvocationTree.getMethodSelect()).getExpression().toString();
    } else {
        threadString = "this";
    }
    // with calculating time with declared variables)
    if (!methodInvocationTree.getArguments().isEmpty()) {
        return Description.NO_MATCH;
    }
    if (MATCH_THREAD_JOIN.matches(methodInvocationTree, visitorState)) {
        TreePath treePath = ASTHelpers.findPathFromEnclosingNodeToTopLevel(visitorState.getPath(), TryTree.class);
        if (treePath == null) {
            return Description.NO_MATCH;
        }
        TreePath pathToLoop = ASTHelpers.findPathFromEnclosingNodeToTopLevel(treePath, WhileLoopTree.class);
        // checks to make sure that if there is a while loop with only one statement (the try catch
        // block)
        boolean hasWhileLoopOneStatement = false;
        if (pathToLoop != null) {
            Tree statements = ((WhileLoopTree) pathToLoop.getLeaf()).getStatement();
            if (statements instanceof BlockTree) {
                if (((BlockTree) statements).getStatements().size() == 1) {
                    hasWhileLoopOneStatement = true;
                }
            }
        }
        Type interruptedType = visitorState.getSymtab().interruptedExceptionType;
        Type exceptionType = visitorState.getSymtab().exceptionType;
        TryTree tryTree = (TryTree) treePath.getLeaf();
        // scans the try tree block for any other actions so that we do not accidentally delete
        // important actions when replacing
        TreeScannerMethodInvocations treeScanner = new TreeScannerMethodInvocations();
        treeScanner.scan(tryTree.getBlock(), methodInvocationTree.toString());
        if (treeScanner.count > 0) {
            return Description.NO_MATCH;
        }
        if (tryTree.getFinallyBlock() != null) {
            return Description.NO_MATCH;
        }
        List<? extends CatchTree> catches = tryTree.getCatches();
        for (CatchTree tree : catches) {
            Type typeSym = ASTHelpers.getType(tree.getParameter().getType());
            if (Objects.equals(interruptedType, typeSym) || Objects.equals(exceptionType, typeSym)) {
                List<? extends StatementTree> statementTrees = tree.getBlock().getStatements();
                // replaces the while loop with the try block or replaces just the try block
                if (statementTrees.isEmpty() || (statementTrees.size() == 1 && statementTrees.get(0).toString().equals(";"))) {
                    SuggestedFix.Builder builder = SuggestedFix.builder();
                    builder.replace(hasWhileLoopOneStatement ? pathToLoop.getLeaf() : tryTree, "Uninterruptibles.joinUninterruptibly(" + threadString + ");");
                    builder.addImport("com.google.common.util.concurrent.Uninterruptibles");
                    return describeMatch(methodInvocationTree, builder.build());
                }
            }
        }
    }
    return Description.NO_MATCH;
}