Examples with RVMClass org.jikesrvm.classloader.RVMClass used on opensource projects

Example 16 with RVMClass

use of org.jikesrvm.classloader.RVMClass in project JikesRVM by JikesRVM.

the class InlineTools method isCurrentlyFinal.

/**
 * Is the method CURRENTLY final (not overridden by any subclass)?
 * <p>
 * Note that this says nothing about whether or not the method will
 * be overridden by future dynamically loaded classes.
 *
 * @param callee the method to check
 * @param searchSubclasses whether so search subclasses.
 * @return whether the method is currently final. This will be a
 *  conservative approximation if subclasses are not searched.
 */
public static boolean isCurrentlyFinal(RVMMethod callee, boolean searchSubclasses) {
    RVMClass klass = callee.getDeclaringClass();
    if (klass.isInterface()) {
        // interface methods are not final.
        return false;
    }
    RVMClass[] subClasses = klass.getSubClasses();
    if (subClasses.length == 0) {
        // Currently no subclasses, so trivially not overridden
        return true;
    } else if (searchSubclasses) {
        // see if any subclasses have overridden the method
        Stack<RVMClass> s = new Stack<RVMClass>();
        for (RVMClass subClass1 : subClasses) {
            s.push(subClass1);
        }
        while (!s.isEmpty()) {
            RVMClass subClass = s.pop();
            if (subClass.findDeclaredMethod(callee.getName(), callee.getDescriptor()) != null) {
                // found an overridding method
                return false;
            }
            subClasses = subClass.getSubClasses();
            for (RVMClass subClass1 : subClasses) {
                s.push(subClass1);
            }
        }
        // didn't find an overridding method in all currently resolved subclasses
        return true;
    } else {
        // could be one, so be conservative.
        return false;
    }
}

Example 17 with RVMClass

use of org.jikesrvm.classloader.RVMClass in project JikesRVM by JikesRVM.

the class Inliner method execute.

/**
 * Return a generation context that represents the
 * execution of inlDec in the context <code>&lt;parent,ebag&gt;</code> for
 * the call instruction callSite.
 * <p> PRECONDITION: inlDec.isYes()
 * <p> POSTCONDITIONS:
 * Let gc be the returned generation context.
 * <ul>
 *  <li> gc.cfg.firstInCodeOrder is the entry to the inlined context
 *  <li>gc.cfg.lastInCodeOrder is the exit from the inlined context
 *  <li> GenerationContext.transferState(parent, child) has been called.
 * </ul>
 *
 * @param inlDec the inlining decision to execute
 * @param parent the caller generation context
 * @param ebag exception handler scope for the caller
 * @param callSite the callsite to execute
 * @return a generation context that represents the execution of the
 *         inline decision in the given context
 */
public static GenerationContext execute(InlineDecision inlDec, GenerationContext parent, ExceptionHandlerBasicBlockBag ebag, Instruction callSite) {
    if (inlDec.needsGuard()) {
        // Step 1: create the synthetic generation context we'll
        // return to our caller.
        GenerationContext container = GenerationContext.createSynthetic(parent, ebag);
        container.getCfg().breakCodeOrder(container.getPrologue(), container.getEpilogue());
        // Step 2: (a) Print a message (optional)
        // (b) Generate the child GC for each target
        RVMMethod[] targets = inlDec.getTargets();
        byte[] guards = inlDec.getGuards();
        GenerationContext[] children = new GenerationContext[targets.length];
        for (int i = 0; i < targets.length; i++) {
            NormalMethod callee = (NormalMethod) targets[i];
            // (a)
            if (parent.getOptions().PRINT_INLINE_REPORT) {
                String guard = guards[i] == OptOptions.INLINE_GUARD_CLASS_TEST ? " (class test) " : " (method test) ";
                VM.sysWriteln("\tGuarded inline" + guard + " " + callee + " into " + callSite.position().getMethod() + " at bytecode " + callSite.getBytecodeIndex());
            }
            // (b)
            children[i] = parent.createChildContext(ebag, callee, callSite);
            BC2IR.generateHIR(children[i]);
            children[i].transferStateToParent();
        }
        // special purpose coding wrapping the calls to Operand.meet.
        if (Call.hasResult(callSite)) {
            Register reg = Call.getResult(callSite).getRegister();
            container.setResult(children[0].getResult());
            for (int i = 1; i < targets.length; i++) {
                if (children[i].getResult() != null) {
                    container.setResult((container.getResult() == null) ? children[i].getResult() : Operand.meet(container.getResult(), children[i].getResult(), reg));
                }
            }
            if (!inlDec.OSRTestFailed()) {
                // Account for the non-predicted case as well...
                RegisterOperand failureCaseResult = Call.getResult(callSite).copyRO();
                container.setResult((container.getResult() == null) ? failureCaseResult : Operand.meet(container.getResult(), failureCaseResult, reg));
            }
        }
        // Step 4: Create a block to contain a copy of the original call or an OSR_Yieldpoint
        // to cover the case that all predictions fail.
        BasicBlock testFailed = new BasicBlock(callSite.getBytecodeIndex(), callSite.position(), parent.getCfg());
        testFailed.setExceptionHandlers(ebag);
        if (COUNT_FAILED_GUARDS && Controller.options.INSERT_DEBUGGING_COUNTERS) {
            // Get a dynamic count of how many times guards fail at runtime.
            // Need a name for the event to count.  In this example, a
            // separate counter for each method by using the method name
            // as the event name.  You could also have used just the string
            // "Guarded inline failed" to keep only one counter.
            String eventName = "Guarded inline failed: " + callSite.position().getMethod().toString();
            // Create instruction that will increment the counter
            // corresponding to the named event.
            Instruction counterInst = AOSDatabase.debuggingCounterData.getCounterInstructionForEvent(eventName);
            testFailed.appendInstruction(counterInst);
        }
        if (inlDec.OSRTestFailed()) {
            // note where we're storing the osr barrier instruction
            Instruction lastOsrBarrier = parent.getOSRBarrierFromInst(callSite);
            Instruction s = BC2IR._osrHelper(lastOsrBarrier, parent);
            s.copyPosition(callSite);
            testFailed.appendInstruction(s);
            testFailed.insertOut(parent.getExit());
        } else {
            Instruction call = callSite.copyWithoutLinks();
            Call.getMethod(call).setIsGuardedInlineOffBranch(true);
            call.copyPosition(callSite);
            testFailed.appendInstruction(call);
            testFailed.insertOut(container.getEpilogue());
            // BC2IR.maybeInlineMethod).
            if (ebag != null) {
                for (Enumeration<BasicBlock> e = ebag.enumerator(); e.hasMoreElements(); ) {
                    BasicBlock handler = e.nextElement();
                    testFailed.insertOut(handler);
                }
            }
            testFailed.setCanThrowExceptions();
            testFailed.setMayThrowUncaughtException();
        }
        container.getCfg().linkInCodeOrder(testFailed, container.getEpilogue());
        testFailed.setInfrequent();
        // Step 5: Patch together all the callees by generating guard blocks
        BasicBlock firstIfBlock = testFailed;
        // Note: We know that receiver must be a register
        // operand (and not a string constant) because we are doing a
        // guarded inlining....if it was a string constant we'd have
        // been able to inline without a guard.
        Operand receiver = Call.getParam(callSite, 0);
        MethodOperand mo = Call.getMethod(callSite);
        boolean isInterface = mo.isInterface();
        if (isInterface) {
            if (VM.BuildForIMTInterfaceInvocation) {
                RVMType interfaceType = mo.getTarget().getDeclaringClass();
                TypeReference recTypeRef = receiver.getType();
                RVMClass recType = (RVMClass) recTypeRef.peekType();
                // Attempt to avoid inserting the check by seeing if the
                // known static type of the receiver implements the interface.
                boolean requiresImplementsTest = true;
                if (recType != null && recType.isResolved() && !recType.isInterface()) {
                    byte doesImplement = ClassLoaderProxy.includesType(interfaceType.getTypeRef(), recTypeRef);
                    requiresImplementsTest = doesImplement != YES;
                }
                if (requiresImplementsTest) {
                    RegisterOperand checkedReceiver = parent.getTemps().makeTemp(receiver);
                    Instruction dtc = TypeCheck.create(MUST_IMPLEMENT_INTERFACE, checkedReceiver, receiver.copy(), new TypeOperand(interfaceType), Call.getGuard(callSite).copy());
                    dtc.copyPosition(callSite);
                    checkedReceiver.refine(interfaceType.getTypeRef());
                    Call.setParam(callSite, 0, checkedReceiver.copyRO());
                    testFailed.prependInstruction(dtc);
                }
            }
        }
        // "logical" test and to share test insertion for interfaces/virtuals.
        for (int i = children.length - 1; i >= 0; i--, testFailed = firstIfBlock) {
            firstIfBlock = new BasicBlock(callSite.getBytecodeIndex(), callSite.position(), parent.getCfg());
            firstIfBlock.setExceptionHandlers(ebag);
            BasicBlock lastIfBlock = firstIfBlock;
            RVMMethod target = children[i].getMethod();
            Instruction tmp;
            if (isInterface) {
                RVMClass callDeclClass = mo.getTarget().getDeclaringClass();
                if (!callDeclClass.isInterface()) {
                    // the entire compilation.
                    throw new OptimizingCompilerException("Attempted guarded inline of invoke interface when decl class of target method may not be an interface");
                }
                // We potentially have to generate IR to perform two tests here:
                // (1) Does the receiver object implement callDeclClass?
                // (2) Given that it does, is target the method that would
                // be invoked for this receiver?
                // It is quite common to be able to answer (1) "YES" at compile
                // time, in which case we only have to generate IR to establish
                // (2) at runtime.
                byte doesImplement = ClassLoaderProxy.includesType(callDeclClass.getTypeRef(), target.getDeclaringClass().getTypeRef());
                if (doesImplement != YES) {
                    // implements the interface).
                    if (parent.getOptions().PRINT_INLINE_REPORT) {
                        VM.sysWriteln("\t\tRequired additional instanceof " + callDeclClass + " test");
                    }
                    firstIfBlock = new BasicBlock(callSite.getBytecodeIndex(), callSite.position(), parent.getCfg());
                    firstIfBlock.setExceptionHandlers(ebag);
                    RegisterOperand instanceOfResult = parent.getTemps().makeTempInt();
                    tmp = InstanceOf.create(INSTANCEOF_NOTNULL, instanceOfResult, new TypeOperand(callDeclClass), receiver.copy(), Call.getGuard(callSite));
                    tmp.copyPosition(callSite);
                    firstIfBlock.appendInstruction(tmp);
                    tmp = IfCmp.create(INT_IFCMP, parent.getTemps().makeTempValidation(), instanceOfResult.copyD2U(), new IntConstantOperand(0), ConditionOperand.EQUAL(), testFailed.makeJumpTarget(), BranchProfileOperand.unlikely());
                    tmp.copyPosition(callSite);
                    firstIfBlock.appendInstruction(tmp);
                    firstIfBlock.insertOut(testFailed);
                    firstIfBlock.insertOut(lastIfBlock);
                    container.getCfg().linkInCodeOrder(firstIfBlock, lastIfBlock);
                }
            }
            if (guards[i] == OptOptions.INLINE_GUARD_CLASS_TEST) {
                tmp = InlineGuard.create(IG_CLASS_TEST, receiver.copy(), Call.getGuard(callSite).copy(), new TypeOperand(target.getDeclaringClass()), testFailed.makeJumpTarget(), BranchProfileOperand.unlikely());
            } else if (guards[i] == OptOptions.INLINE_GUARD_METHOD_TEST) {
                // declaring class.
                if (isInterface) {
                    RegisterOperand t = parent.getTemps().makeTempInt();
                    Instruction test = InstanceOf.create(INSTANCEOF_NOTNULL, t, new TypeOperand(target.getDeclaringClass().getTypeRef()), receiver.copy());
                    test.copyPosition(callSite);
                    lastIfBlock.appendInstruction(test);
                    Instruction cmp = IfCmp.create(INT_IFCMP, parent.getTemps().makeTempValidation(), t.copyD2U(), new IntConstantOperand(0), ConditionOperand.EQUAL(), testFailed.makeJumpTarget(), BranchProfileOperand.unlikely());
                    cmp.copyPosition(callSite);
                    lastIfBlock.appendInstruction(cmp);
                    BasicBlock subclassTest = new BasicBlock(callSite.getBytecodeIndex(), callSite.position(), parent.getCfg());
                    lastIfBlock.insertOut(testFailed);
                    lastIfBlock.insertOut(subclassTest);
                    container.getCfg().linkInCodeOrder(lastIfBlock, subclassTest);
                    lastIfBlock = subclassTest;
                }
                tmp = InlineGuard.create(IG_METHOD_TEST, receiver.copy(), Call.getGuard(callSite).copy(), MethodOperand.VIRTUAL(target.getMemberRef().asMethodReference(), target), testFailed.makeJumpTarget(), BranchProfileOperand.unlikely());
            } else {
                tmp = InlineGuard.create(IG_PATCH_POINT, receiver.copy(), Call.getGuard(callSite).copy(), MethodOperand.VIRTUAL(target.getMemberRef().asMethodReference(), target), testFailed.makeJumpTarget(), inlDec.OSRTestFailed() ? BranchProfileOperand.never() : BranchProfileOperand.unlikely());
            }
            tmp.copyPosition(callSite);
            lastIfBlock.appendInstruction(tmp);
            lastIfBlock.insertOut(testFailed);
            lastIfBlock.insertOut(children[i].getPrologue());
            container.getCfg().linkInCodeOrder(lastIfBlock, children[i].getCfg().firstInCodeOrder());
            if (children[i].getEpilogue() != null) {
                children[i].getEpilogue().appendInstruction(container.getEpilogue().makeGOTO());
                children[i].getEpilogue().insertOut(container.getEpilogue());
            }
            container.getCfg().linkInCodeOrder(children[i].getCfg().lastInCodeOrder(), testFailed);
        }
        // Step 6: finish by linking container.prologue & testFailed
        container.getPrologue().insertOut(testFailed);
        container.getCfg().linkInCodeOrder(container.getPrologue(), testFailed);
        return container;
    } else {
        if (VM.VerifyAssertions)
            VM._assert(inlDec.getNumberOfTargets() == 1);
        NormalMethod callee = (NormalMethod) inlDec.getTargets()[0];
        if (parent.getOptions().PRINT_INLINE_REPORT) {
            VM.sysWriteln("\tInline " + callee + " into " + callSite.position().getMethod() + " at bytecode " + callSite.getBytecodeIndex());
        }
        GenerationContext child = parent.createChildContext(ebag, callee, callSite);
        BC2IR.generateHIR(child);
        child.transferStateToParent();
        return child;
    }
}

Example 18 with RVMClass

use of org.jikesrvm.classloader.RVMClass in project JikesRVM by JikesRVM.

the class InterfaceHierarchy method allSubClasses.

/**
 * @param C an interface
 * @return the set of all classes known to extend C
 */
private static ImmutableEntryHashSetRVM<RVMClass> allSubClasses(RVMClass C) {
    ImmutableEntryHashSetRVM<RVMClass> result = new ImmutableEntryHashSetRVM<RVMClass>(5);
    // also add any classes that implement a sub-interface of I.
    for (RVMClass subClass : C.getSubClasses()) {
        result.add(subClass);
        result.addAll(allSubClasses(subClass));
    }
    return result;
}

Example 19 with RVMClass

use of org.jikesrvm.classloader.RVMClass in project JikesRVM by JikesRVM.

the class InterfaceHierarchy method getUniqueImplementation.

/**
 * If, in the current class hierarchy, there is exactly one method that
 * defines the interface method foo, then return the unique
 * implementation.  If there is not a unique implementation, return
 * null.
 *
 * @param foo an interface method
 * @return the unique implementation if it exists, {@code null} otherwise
 */
public static synchronized RVMMethod getUniqueImplementation(RVMMethod foo) {
    RVMClass I = foo.getDeclaringClass();
    ImmutableEntryHashSetRVM<RVMClass> classes = allImplementors(I);
    RVMMethod firstMethod = null;
    Atom name = foo.getName();
    Atom desc = foo.getDescriptor();
    for (RVMClass klass : classes) {
        RVMMethod m = klass.findDeclaredMethod(name, desc);
        if (firstMethod == null) {
            firstMethod = m;
        }
        if (m != firstMethod) {
            return null;
        }
    }
    return firstMethod;
}

Example 20 with RVMClass

use of org.jikesrvm.classloader.RVMClass in project JikesRVM by JikesRVM.

the class OptimizingBootImageCompiler method match.

private boolean match(RVMMethod method) {
    if (excludePattern == null)
        return true;
    RVMClass cls = method.getDeclaringClass();
    String clsName = cls.toString();
    if (clsName.compareTo("org.jikesrvm.compilers.opt.runtimesupport.OptSaveVolatile") == 0)
        return true;
    String methodName = method.getName().toString();
    String fullName = clsName + "." + methodName;
    return (fullName.indexOf(excludePattern)) < 0;
}