Mercurial > hg > graal-jvmci-8
view graal/GraalCompiler/src/com/sun/c1x/graph/GraphBuilder.java @ 2673:98447ab8bd83
Create less nodes in case of Deopt
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
---|---|
date | Fri, 13 May 2011 11:19:25 +0200 |
parents | d8601d421b96 |
children | 6ab73784566a |
line wrap: on
line source
/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.c1x.graph; import static com.sun.cri.bytecode.Bytecodes.*; import static java.lang.reflect.Modifier.*; import java.lang.reflect.*; import java.util.*; import com.oracle.graal.graph.*; import com.sun.c1x.*; import com.sun.c1x.debug.*; import com.sun.c1x.ir.*; import com.sun.c1x.util.*; import com.sun.c1x.value.*; import com.sun.cri.bytecode.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; import com.sun.cri.ri.RiType.Representation; /** * The {@code GraphBuilder} class parses the bytecode of a method and builds the IR graph. * A number of optimizations may be performed during parsing of the bytecode, including value * numbering, inlining, constant folding, strength reduction, etc. */ public final class GraphBuilder { /** * The minimum value to which {@link C1XOptions#TraceBytecodeParserLevel} must be set to trace * the bytecode instructions as they are parsed. */ public static final int TRACELEVEL_INSTRUCTIONS = 1; /** * The minimum value to which {@link C1XOptions#TraceBytecodeParserLevel} must be set to trace * the frame state before each bytecode instruction as it is parsed. */ public static final int TRACELEVEL_STATE = 2; /** * An enumeration of flags describing scope attributes. */ public enum Flag { /** * Scope is protected by an exception handler. * This attribute is inherited by nested scopes. */ HasHandler, /** * Code in scope cannot contain safepoints. * This attribute is inherited by nested scopes. */ NoSafepoints; public final int mask = 1 << ordinal(); } private final IR ir; private final C1XCompilation compilation; private final CiStatistics stats; private final BytecodeStream stream; // the bytecode stream // bci-to-block mapping private BlockMap blockMap; // the constant pool private final RiConstantPool constantPool; // the worklist of blocks, managed like a sorted list private BlockBegin[] workList; // the current position in the worklist private int workListIndex; /** * Mask of {@link Flag} values. */ private int flags; // Exception handler list private List<ExceptionHandler> exceptionHandlers; private BlockBegin curBlock; // the current block private FrameStateBuilder frameState; // the current execution state private Instruction lastInstr; // the last instruction added private final LogStream log; private Value rootMethodSynchronizedObject; private final Graph graph; /** * Creates a new, initialized, {@code GraphBuilder} instance for a given compilation. * * @param compilation the compilation * @param ir the IR to build the graph into * @param graph */ public GraphBuilder(C1XCompilation compilation, IR ir, Graph graph) { this.compilation = compilation; this.ir = ir; this.stats = compilation.stats; log = C1XOptions.TraceBytecodeParserLevel > 0 ? new LogStream(TTY.out()) : null; stream = new BytecodeStream(compilation.method.code()); constantPool = compilation.runtime.getConstantPool(compilation.method); this.graph = graph; this.frameState = new FrameStateBuilder(compilation.method, graph); } /** * Builds the graph for a the specified {@code IRScope}. * @param scope the top IRScope */ public void build() { RiMethod rootMethod = compilation.method; if (log != null) { log.println(); log.println("Compiling " + compilation.method); } if (rootMethod.noSafepoints()) { flags |= Flag.NoSafepoints.mask; } // 1. create the start block ir.startBlock = new BlockBegin(0, ir.nextBlockNumber(), graph); BlockBegin startBlock = ir.startBlock; graph.root().setStart(startBlock); // 2. compute the block map, setup exception handlers and get the entrypoint(s) blockMap = compilation.getBlockMap(rootMethod); BlockBegin stdEntry = blockMap.get(0); curBlock = startBlock; RiExceptionHandler[] handlers = rootMethod.exceptionHandlers(); if (handlers != null && handlers.length > 0) { exceptionHandlers = new ArrayList<ExceptionHandler>(handlers.length); for (RiExceptionHandler ch : handlers) { ExceptionHandler h = new ExceptionHandler(ch); h.setEntryBlock(blockAt(h.handler.handlerBCI())); exceptionHandlers.add(h); } flags |= Flag.HasHandler.mask; } startBlock.mergeOrClone(frameState, rootMethod); BlockBegin syncHandler = null; // 3. setup internal state for appending instructions curBlock = startBlock; lastInstr = startBlock; lastInstr.appendNext(null, -1); if (isSynchronized(rootMethod.accessFlags())) { // 4A.1 add a monitor enter to the start block rootMethodSynchronizedObject = synchronizedObject(frameState, compilation.method); genMonitorEnter(rootMethodSynchronizedObject, Instruction.SYNCHRONIZATION_ENTRY_BCI); // 4A.2 finish the start block finishStartBlock(startBlock, stdEntry); // 4A.3 setup an exception handler to unlock the root method synchronized object syncHandler = new BlockBegin(Instruction.SYNCHRONIZATION_ENTRY_BCI, ir.nextBlockNumber(), graph); syncHandler.setExceptionEntry(); syncHandler.setBlockFlag(BlockBegin.BlockFlag.IsOnWorkList); syncHandler.setBlockFlag(BlockBegin.BlockFlag.DefaultExceptionHandler); ExceptionHandler h = new ExceptionHandler(new CiExceptionHandler(0, rootMethod.code().length, -1, 0, null)); h.setEntryBlock(syncHandler); addExceptionHandler(h); } else { // 4B.1 simply finish the start block finishStartBlock(startBlock, stdEntry); } // 5. SKIPPED: look for intrinsics // 6B.1 do the normal parsing addToWorkList(stdEntry); iterateAllBlocks(); if (syncHandler != null && syncHandler.stateBefore() != null) { // generate unlocking code if the exception handler is reachable fillSyncHandler(rootMethodSynchronizedObject, syncHandler); } } private void finishStartBlock(BlockBegin startBlock, BlockBegin stdEntry) { assert curBlock == startBlock; FrameState stateAfter = frameState.create(bci()); Goto base = new Goto(stdEntry, stateAfter, false, graph); appendWithoutOptimization(base, 0); startBlock.setEnd(base); assert stdEntry.stateBefore() == null; stdEntry.mergeOrClone(stateAfter, method()); } public RiMethod method() { return compilation.method; } public BytecodeStream stream() { return stream; } public int bci() { return stream.currentBCI(); } public int nextBCI() { return stream.nextBCI(); } private void loadLocal(int index, CiKind kind) { frameState.push(kind, frameState.loadLocal(index)); } private void storeLocal(CiKind kind, int index) { frameState.storeLocal(index, frameState.pop(kind)); } List<ExceptionHandler> handleException(Instruction x, int bci) { if (!hasHandler()) { return ExceptionHandler.ZERO_HANDLERS; } ArrayList<ExceptionHandler> exceptionHandlers = new ArrayList<ExceptionHandler>(); FrameState state = frameState.create(bci); assert bci == Instruction.SYNCHRONIZATION_ENTRY_BCI || bci == bci() : "invalid bci"; // join with all potential exception handlers if (this.exceptionHandlers != null) { for (ExceptionHandler handler : this.exceptionHandlers) { if (handler.covers(bci)) { // if the handler covers this bytecode index, add it to the list if (addExceptionHandler(exceptionHandlers, handler, state)) { // if the handler was a default handler, we are done return exceptionHandlers; } } } } return exceptionHandlers; } /** * Adds an exception handler to the {@linkplain BlockBegin#exceptionHandlerBlocks() list} * of exception handlers for the {@link #curBlock current block}. * * @param exceptionHandlers * @param handler * @param curScopeData * @param curState the current state with empty stack * @param scopeCount * @return {@code true} if handler catches all exceptions (i.e. {@code handler.isCatchAll() == true}) */ private boolean addExceptionHandler(ArrayList<ExceptionHandler> exceptionHandlers, ExceptionHandler handler, FrameState curState) { compilation.setHasExceptionHandlers(); BlockBegin entry = handler.entryBlock(); FrameState entryState = entry.stateBefore(); assert entry.bci() == handler.handler.handlerBCI(); assert entryState == null || curState.locksSize() == entryState.locksSize() : "locks do not match : cur:" + curState.locksSize() + " entry:" + entryState.locksSize(); // exception handler starts with an empty expression stack curState = curState.duplicateWithEmptyStack(); entry.mergeOrClone(curState, method()); // add current state for correct handling of phi functions int phiOperand = entry.addExceptionState(curState); // add entry to the list of exception handlers of this block curBlock.addExceptionHandler(entry); // add back-edge from exception handler entry to this block if (!entry.blockPredecessors().contains(curBlock)) { entry.addPredecessor(curBlock); } // clone exception handler ExceptionHandler newHandler = new ExceptionHandler(handler); newHandler.setPhiOperand(phiOperand); exceptionHandlers.add(newHandler); // fill in exception handler subgraph lazily if (!entry.wasVisited()) { addToWorkList(entry); } else { // This will occur for exception handlers that cover themselves. This code // pattern is generated by javac for synchronized blocks. See the following // for why this change to javac was made: // // http://www.cs.arizona.edu/projects/sumatra/hallofshame/java-async-race.html } // stop when reaching catch all return handler.isCatchAll(); } private void genLoadConstant(int cpi) { Object con = constantPool().lookupConstant(cpi); if (con instanceof RiType) { // this is a load of class constant which might be unresolved RiType riType = (RiType) con; if (!riType.isResolved()) { append(new Deoptimize(graph, frameState.create(bci()))); frameState.push(CiKind.Object, append(Constant.forObject(null, graph))); } else { frameState.push(CiKind.Object, append(new Constant(riType.getEncoding(Representation.JavaClass), graph))); } } else if (con instanceof CiConstant) { CiConstant constant = (CiConstant) con; frameState.push(constant.kind.stackKind(), appendConstant(constant)); } else { throw new Error("lookupConstant returned an object of incorrect type"); } } private void genLoadIndexed(CiKind kind) { Value index = frameState.ipop(); Value array = frameState.apop(); Value length = append(new ArrayLength(array, graph)); Value v = append(new LoadIndexed(array, index, length, kind, graph)); frameState.push(kind.stackKind(), v); } private void genStoreIndexed(CiKind kind) { Value value = frameState.pop(kind.stackKind()); Value index = frameState.ipop(); Value array = frameState.apop(); Value length = append(new ArrayLength(array, graph)); StoreIndexed result = new StoreIndexed(array, index, length, kind, value, graph); append(result); } private void stackOp(int opcode) { switch (opcode) { case POP: { frameState.xpop(); break; } case POP2: { frameState.xpop(); frameState.xpop(); break; } case DUP: { Value w = frameState.xpop(); frameState.xpush(w); frameState.xpush(w); break; } case DUP_X1: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); frameState.xpush(w1); frameState.xpush(w2); frameState.xpush(w1); break; } case DUP_X2: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); Value w3 = frameState.xpop(); frameState.xpush(w1); frameState.xpush(w3); frameState.xpush(w2); frameState.xpush(w1); break; } case DUP2: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); frameState.xpush(w2); frameState.xpush(w1); frameState.xpush(w2); frameState.xpush(w1); break; } case DUP2_X1: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); Value w3 = frameState.xpop(); frameState.xpush(w2); frameState.xpush(w1); frameState.xpush(w3); frameState.xpush(w2); frameState.xpush(w1); break; } case DUP2_X2: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); Value w3 = frameState.xpop(); Value w4 = frameState.xpop(); frameState.xpush(w2); frameState.xpush(w1); frameState.xpush(w4); frameState.xpush(w3); frameState.xpush(w2); frameState.xpush(w1); break; } case SWAP: { Value w1 = frameState.xpop(); Value w2 = frameState.xpop(); frameState.xpush(w1); frameState.xpush(w2); break; } default: throw Util.shouldNotReachHere(); } } private void genArithmeticOp(CiKind kind, int opcode) { genArithmeticOp(kind, opcode, false); } private void genArithmeticOp(CiKind kind, int opcode, boolean canTrap) { genArithmeticOp(kind, opcode, kind, kind, canTrap); } private void genArithmeticOp(CiKind result, int opcode, CiKind x, CiKind y, boolean canTrap) { Value yValue = frameState.pop(y); Value xValue = frameState.pop(x); Value result1 = append(new ArithmeticOp(opcode, result, xValue, yValue, isStrict(method().accessFlags()), canTrap, graph)); frameState.push(result, result1); } private void genNegateOp(CiKind kind) { frameState.push(kind, append(new NegateOp(frameState.pop(kind), graph))); } private void genShiftOp(CiKind kind, int opcode) { Value s = frameState.ipop(); Value x = frameState.pop(kind); frameState.push(kind, append(new ShiftOp(opcode, x, s, graph))); } private void genLogicOp(CiKind kind, int opcode) { Value y = frameState.pop(kind); Value x = frameState.pop(kind); frameState.push(kind, append(new LogicOp(opcode, x, y, graph))); } private void genCompareOp(CiKind kind, int opcode, CiKind resultKind) { Value y = frameState.pop(kind); Value x = frameState.pop(kind); Value value = append(new CompareOp(opcode, resultKind, x, y, graph)); if (!resultKind.isVoid()) { frameState.ipush(value); } } private void genConvert(int opcode, CiKind from, CiKind to) { CiKind tt = to.stackKind(); frameState.push(tt, append(new Convert(opcode, frameState.pop(from.stackKind()), tt, graph))); } private void genIncrement() { int index = stream().readLocalIndex(); int delta = stream().readIncrement(); Value x = frameState.localAt(index); Value y = append(Constant.forInt(delta, graph)); frameState.storeLocal(index, append(new ArithmeticOp(IADD, CiKind.Int, x, y, isStrict(method().accessFlags()), false, graph))); } private void genGoto(int fromBCI, int toBCI) { boolean isSafepoint = !noSafepoints() && toBCI <= fromBCI; append(new Goto(blockAt(toBCI), null, isSafepoint, graph)); } private void ifNode(Value x, Condition cond, Value y, FrameState stateBefore) { BlockBegin tsucc = blockAt(stream().readBranchDest()); BlockBegin fsucc = blockAt(stream().nextBCI()); int bci = stream().currentBCI(); boolean isSafepoint = !noSafepoints() && (tsucc.bci() <= bci || fsucc.bci() <= bci); append(new If(x, cond, y, tsucc, fsucc, isSafepoint ? stateBefore : null, isSafepoint, graph)); } private void genIfZero(Condition cond) { Value y = appendConstant(CiConstant.INT_0); FrameState stateBefore = frameState.create(bci()); Value x = frameState.ipop(); ifNode(x, cond, y, stateBefore); } private void genIfNull(Condition cond) { FrameState stateBefore = frameState.create(bci()); Value y = appendConstant(CiConstant.NULL_OBJECT); Value x = frameState.apop(); ifNode(x, cond, y, stateBefore); } private void genIfSame(CiKind kind, Condition cond) { FrameState stateBefore = frameState.create(bci()); Value y = frameState.pop(kind); Value x = frameState.pop(kind); ifNode(x, cond, y, stateBefore); } private void genThrow(int bci) { FrameState stateBefore = frameState.create(bci); Throw t = new Throw(frameState.apop(), !noSafepoints(), graph); t.setStateBefore(stateBefore); appendWithoutOptimization(t, bci); } private void genCheckCast() { int cpi = stream().readCPI(); RiType type = constantPool().lookupType(cpi, CHECKCAST); boolean isInitialized = type.isResolved(); Value typeInstruction = genTypeOrDeopt(RiType.Representation.ObjectHub, type, isInitialized, cpi, frameState.create(bci())); Instruction result; Value object = frameState.apop(); if (typeInstruction != null) { result = new CheckCast(type, typeInstruction, object, graph); } else { result = Constant.forObject(null, graph); } frameState.apush(append(result)); } private void genInstanceOf() { int cpi = stream().readCPI(); RiType type = constantPool().lookupType(cpi, INSTANCEOF); boolean isInitialized = type.isResolved(); //System.out.println("instanceof : type.isResolved() = " + type.isResolved() + "; type.isInitialized() = " + type.isInitialized()); Value typeInstruction = genTypeOrDeopt(RiType.Representation.ObjectHub, type, isInitialized, cpi, frameState.create(bci())); Instruction result; Value object = frameState.apop(); if (typeInstruction != null) { result = new InstanceOf(type, typeInstruction, object, graph); } else { result = Constant.forInt(0, graph); } frameState.ipush(append(result)); } void genNewInstance(int cpi) { RiType type = constantPool().lookupType(cpi, NEW); FrameState stateBefore = null; if (!type.isResolved()) { stateBefore = frameState.create(bci()); } NewInstance n = new NewInstance(type, cpi, constantPool(), graph); n.setStateBefore(stateBefore); frameState.apush(append(n)); } private void genNewTypeArray(int typeCode) { CiKind kind = CiKind.fromArrayTypeCode(typeCode); RiType elementType = compilation.runtime.asRiType(kind); NewTypeArray nta = new NewTypeArray(frameState.ipop(), elementType, graph); frameState.apush(append(nta)); } private void genNewObjectArray(int cpi) { RiType type = constantPool().lookupType(cpi, ANEWARRAY); FrameState stateBefore = null; if (!type.isResolved()) { stateBefore = frameState.create(bci()); } NewArray n = new NewObjectArray(type, frameState.ipop(), graph); frameState.apush(append(n)); n.setStateBefore(stateBefore); } private void genNewMultiArray(int cpi) { RiType type = constantPool().lookupType(cpi, MULTIANEWARRAY); FrameState stateBefore = null; if (!type.isResolved()) { stateBefore = frameState.create(bci()); } int rank = stream().readUByte(bci() + 3); Value[] dims = new Value[rank]; for (int i = rank - 1; i >= 0; i--) { dims[i] = frameState.ipop(); } NewArray n = new NewMultiArray(type, dims, cpi, constantPool(), graph); frameState.apush(append(n)); n.setStateBefore(stateBefore); } private void genGetField(int cpi, RiField field) { // Must copy the state here, because the field holder must still be on the stack. FrameState stateBefore = null; if (!field.isResolved()) { stateBefore = frameState.create(bci()); } LoadField load = new LoadField(frameState.apop(), field, stateBefore, graph); appendOptimizedLoadField(field.kind(), load); } private void genPutField(int cpi, RiField field) { // Must copy the state here, because the field holder must still be on the stack. FrameState stateBefore = null; if (!field.isResolved()) { stateBefore = frameState.create(bci()); } Value value = frameState.pop(field.kind().stackKind()); StoreField store = new StoreField(frameState.apop(), field, value, graph); appendOptimizedStoreField(store); store.setStateBefore(stateBefore); } private void genGetStatic(int cpi, RiField field) { RiType holder = field.holder(); boolean isInitialized = field.isResolved(); CiConstant constantValue = null; FrameState stateBefore = frameState.create(bci()); if (isInitialized) { constantValue = field.constantValue(null); } if (constantValue != null) { frameState.push(constantValue.kind.stackKind(), appendConstant(constantValue)); } else { Value container = genTypeOrDeopt(RiType.Representation.StaticFields, holder, isInitialized, cpi, stateBefore); if (container == null) { container = Constant.forObject(null, graph); } LoadField load = new LoadField(container, field, stateBefore, graph); appendOptimizedLoadField(field.kind(), load); } } private void genPutStatic(int cpi, RiField field) { RiType holder = field.holder(); FrameState stateBefore = frameState.create(bci()); Value container = genTypeOrDeopt(RiType.Representation.StaticFields, holder, field.isResolved(), cpi, stateBefore); Value value = frameState.pop(field.kind().stackKind()); if (container != null) { StoreField store = new StoreField(container, field, value, graph); appendOptimizedStoreField(store); if (!field.isResolved()) { store.setStateBefore(stateBefore); } } } private Value genTypeOrDeopt(RiType.Representation representation, RiType holder, boolean initialized, int cpi, FrameState stateBefore) { if (initialized) { return appendConstant(holder.getEncoding(representation)); } else { append(new Deoptimize(graph, stateBefore)); return null; } } private void appendOptimizedStoreField(StoreField store) { append(store); } private void appendOptimizedLoadField(CiKind kind, LoadField load) { // append the load to the instruction Value optimized = append(load); frameState.push(kind.stackKind(), optimized); } private void genInvokeStatic(RiMethod target, int cpi, RiConstantPool constantPool) { RiType holder = target.holder(); boolean isInitialized = target.isResolved() && holder.isInitialized(); if (!isInitialized && C1XOptions.ResolveClassBeforeStaticInvoke) { // Re-use the same resolution code as for accessing a static field. Even though // the result of resolution is not used by the invocation (only the side effect // of initialization is required), it can be commoned with static field accesses. genTypeOrDeopt(RiType.Representation.StaticFields, holder, isInitialized, cpi, frameState.create(bci())); } Value[] args = frameState.popArguments(target.signature().argumentSlots(false)); appendInvoke(INVOKESTATIC, target, args, cpi, constantPool); } private void genInvokeInterface(RiMethod target, int cpi, RiConstantPool constantPool) { Value[] args = frameState.popArguments(target.signature().argumentSlots(true)); genInvokeIndirect(INVOKEINTERFACE, target, args, cpi, constantPool); } private void genInvokeVirtual(RiMethod target, int cpi, RiConstantPool constantPool) { Value[] args = frameState.popArguments(target.signature().argumentSlots(true)); genInvokeIndirect(INVOKEVIRTUAL, target, args, cpi, constantPool); } private void genInvokeSpecial(RiMethod target, RiType knownHolder, int cpi, RiConstantPool constantPool) { Value[] args = frameState.popArguments(target.signature().argumentSlots(true)); invokeDirect(target, args, knownHolder, cpi, constantPool); } private void genInvokeIndirect(int opcode, RiMethod target, Value[] args, int cpi, RiConstantPool constantPool) { Value receiver = args[0]; // attempt to devirtualize the call if (target.isResolved()) { RiType klass = target.holder(); // 0. check for trivial cases if (target.canBeStaticallyBound() && !isAbstract(target.accessFlags())) { // check for trivial cases (e.g. final methods, nonvirtual methods) invokeDirect(target, args, target.holder(), cpi, constantPool); return; } // 1. check if the exact type of the receiver can be determined RiType exact = getExactType(klass, receiver); if (exact != null && exact.isResolved()) { // either the holder class is exact, or the receiver object has an exact type invokeDirect(exact.resolveMethodImpl(target), args, exact, cpi, constantPool); return; } } // devirtualization failed, produce an actual invokevirtual appendInvoke(opcode, target, args, cpi, constantPool); } private CiKind returnKind(RiMethod target) { return target.signature().returnKind(); } private void invokeDirect(RiMethod target, Value[] args, RiType knownHolder, int cpi, RiConstantPool constantPool) { appendInvoke(INVOKESPECIAL, target, args, cpi, constantPool); } private void appendInvoke(int opcode, RiMethod target, Value[] args, int cpi, RiConstantPool constantPool) { CiKind resultType = returnKind(target); Value result = append(new Invoke(opcode, resultType.stackKind(), args, target, target.signature().returnType(compilation.method.holder()), graph)); frameState.pushReturn(resultType, result); } private RiType getExactType(RiType staticType, Value receiver) { RiType exact = staticType.exactType(); if (exact == null) { exact = receiver.exactType(); if (exact == null) { if (receiver.isConstant()) { exact = compilation.runtime.getTypeOf(receiver.asConstant()); } if (exact == null) { RiType declared = receiver.declaredType(); exact = declared == null || !declared.isResolved() ? null : declared.exactType(); } } } return exact; } private RiType getAssumedLeafType(RiType type) { if (isFinal(type.accessFlags())) { return type; } RiType assumed = null; if (C1XOptions.UseAssumptions) { assumed = type.uniqueConcreteSubtype(); if (assumed != null) { if (C1XOptions.PrintAssumptions) { TTY.println("Recording concrete subtype assumption in context of " + type.name() + ": " + assumed.name()); } compilation.assumptions.recordConcreteSubtype(type, assumed); } } return assumed; } private void callRegisterFinalizer() { Value receiver = frameState.loadLocal(0); RiType declaredType = receiver.declaredType(); RiType receiverType = declaredType; RiType exactType = receiver.exactType(); if (exactType == null && declaredType != null) { exactType = declaredType.exactType(); } if (exactType == null && receiver instanceof Local && ((Local) receiver).javaIndex() == 0) { // the exact type isn't known, but the receiver is parameter 0 => use holder receiverType = compilation.method.holder(); exactType = receiverType.exactType(); } boolean needsCheck = true; if (exactType != null) { // we have an exact type needsCheck = exactType.hasFinalizer(); } else { // if either the declared type of receiver or the holder can be assumed to have no finalizers if (declaredType != null && !declaredType.hasFinalizableSubclass()) { if (compilation.recordNoFinalizableSubclassAssumption(declaredType)) { needsCheck = false; } } if (receiverType != null && !receiverType.hasFinalizableSubclass()) { if (compilation.recordNoFinalizableSubclassAssumption(receiverType)) { needsCheck = false; } } } if (needsCheck) { // append a call to the finalizer registration append(new RegisterFinalizer(frameState.loadLocal(0), frameState.create(bci()), graph)); C1XMetrics.InlinedFinalizerChecks++; } } private void genReturn(Value x) { if (method().isConstructor() && method().holder().superType() == null) { callRegisterFinalizer(); } frameState.clearStack(); if (Modifier.isSynchronized(method().accessFlags())) { // unlock before exiting the method int lockNumber = frameState.locksSize() - 1; MonitorAddress lockAddress = null; if (compilation.runtime.sizeOfBasicObjectLock() != 0) { lockAddress = new MonitorAddress(lockNumber, graph); append(lockAddress); } append(new MonitorExit(rootMethodSynchronizedObject, lockAddress, lockNumber, graph)); frameState.unlock(); } append(new Return(x, !noSafepoints(), graph)); } private void genMonitorEnter(Value x, int bci) { int lockNumber = frameState.locksSize(); MonitorAddress lockAddress = null; if (compilation.runtime.sizeOfBasicObjectLock() != 0) { lockAddress = new MonitorAddress(lockNumber, graph); append(lockAddress); } MonitorEnter monitorEnter = new MonitorEnter(x, lockAddress, lockNumber, graph); appendWithoutOptimization(monitorEnter, bci); frameState.lock(ir, x, lockNumber + 1); if (bci == Instruction.SYNCHRONIZATION_ENTRY_BCI) { monitorEnter.setStateAfter(frameState.create(0)); } } private void genMonitorExit(Value x, int bci) { int lockNumber = frameState.locksSize() - 1; if (lockNumber < 0) { throw new CiBailout("monitor stack underflow"); } MonitorAddress lockAddress = null; if (compilation.runtime.sizeOfBasicObjectLock() != 0) { lockAddress = new MonitorAddress(lockNumber, graph); append(lockAddress); } appendWithoutOptimization(new MonitorExit(x, lockAddress, lockNumber, graph), bci); frameState.unlock(); } private void genJsr(int dest) { throw new CiBailout("jsr/ret not supported"); } private void genRet(int localIndex) { throw new CiBailout("jsr/ret not supported"); } private void genTableswitch() { int bci = bci(); BytecodeTableSwitch ts = new BytecodeTableSwitch(stream(), bci); int max = ts.numberOfCases(); List<BlockBegin> list = new ArrayList<BlockBegin>(max + 1); boolean isBackwards = false; for (int i = 0; i < max; i++) { // add all successors to the successor list int offset = ts.offsetAt(i); list.add(blockAt(bci + offset)); isBackwards |= offset < 0; // track if any of the successors are backwards } int offset = ts.defaultOffset(); isBackwards |= offset < 0; // if the default successor is backwards list.add(blockAt(bci + offset)); boolean isSafepoint = isBackwards && !noSafepoints(); FrameState stateBefore = isSafepoint ? frameState.create(bci()) : null; append(new TableSwitch(frameState.ipop(), list, ts.lowKey(), stateBefore, isSafepoint, graph)); } private void genLookupswitch() { int bci = bci(); BytecodeLookupSwitch ls = new BytecodeLookupSwitch(stream(), bci); int max = ls.numberOfCases(); List<BlockBegin> list = new ArrayList<BlockBegin>(max + 1); int[] keys = new int[max]; boolean isBackwards = false; for (int i = 0; i < max; i++) { // add all successors to the successor list int offset = ls.offsetAt(i); list.add(blockAt(bci + offset)); keys[i] = ls.keyAt(i); isBackwards |= offset < 0; // track if any of the successors are backwards } int offset = ls.defaultOffset(); isBackwards |= offset < 0; // if the default successor is backwards list.add(blockAt(bci + offset)); boolean isSafepoint = isBackwards && !noSafepoints(); FrameState stateBefore = isSafepoint ? frameState.create(bci()) : null; append(new LookupSwitch(frameState.ipop(), list, keys, stateBefore, isSafepoint, graph)); } private Value appendConstant(CiConstant type) { return appendWithBCI(new Constant(type, graph), bci()); } private Value append(Instruction x) { return appendWithBCI(x, bci()); } private Value appendWithoutOptimization(Instruction x, int bci) { return appendWithBCI(x, bci); } private Value appendWithBCI(Instruction x, int bci) { if (x.isAppended()) { // the instruction has already been added return x; } assert x.next() == null : "instruction should not have been appended yet"; assert lastInstr.next() == null : "cannot append instruction to instruction which isn't end (" + lastInstr + "->" + lastInstr.next() + ")"; lastInstr = lastInstr.appendNext(x, bci); if (++stats.nodeCount >= C1XOptions.MaximumInstructionCount) { // bailout if we've exceeded the maximum inlining size throw new CiBailout("Method and/or inlining is too large"); } if (x instanceof Invoke || x instanceof Throw) { // connect the instruction to any exception handlers x.setExceptionHandlers(handleException(x, bci)); } return x; } private BlockBegin blockAtOrNull(int bci) { return blockMap.get(bci); } private BlockBegin blockAt(int bci) { BlockBegin result = blockAtOrNull(bci); assert result != null : "Expected a block to begin at " + bci; return result; } private Value synchronizedObject(FrameStateAccess state, RiMethod target) { if (isStatic(target.accessFlags())) { Constant classConstant = new Constant(target.holder().getEncoding(Representation.JavaClass), graph); return appendWithoutOptimization(classConstant, Instruction.SYNCHRONIZATION_ENTRY_BCI); } else { return state.localAt(0); } } private void fillSyncHandler(Value lock, BlockBegin syncHandler) { BlockBegin origBlock = curBlock; FrameState origState = frameState.create(-1); Instruction origLast = lastInstr; lastInstr = curBlock = syncHandler; while (lastInstr.next() != null) { // go forward to the end of the block lastInstr = lastInstr.next(); } frameState.initializeFrom(syncHandler.stateBefore()); int bci = Instruction.SYNCHRONIZATION_ENTRY_BCI; Value exception = appendWithoutOptimization(new ExceptionObject(graph), bci); assert lock != null; assert frameState.locksSize() > 0 && frameState.lockAt(frameState.locksSize() - 1) == lock; if (lock instanceof Instruction) { Instruction l = (Instruction) lock; if (!l.isAppended()) { lock = appendWithoutOptimization(l, Instruction.SYNCHRONIZATION_ENTRY_BCI); } } // exit the monitor genMonitorExit(lock, Instruction.SYNCHRONIZATION_ENTRY_BCI); frameState.apush(exception); genThrow(bci); BlockEnd end = (BlockEnd) lastInstr; curBlock.setEnd(end); end.setStateAfter(frameState.create(bci())); curBlock = origBlock; frameState.initializeFrom(origState); origState.delete(); lastInstr = origLast; } private void iterateAllBlocks() { BlockBegin b; while ((b = removeFromWorkList()) != null) { if (!b.wasVisited()) { b.setWasVisited(true); // now parse the block curBlock = b; frameState.initializeFrom(b.stateBefore()); lastInstr = b; b.appendNext(null, -1); iterateBytecodesForBlock(b.bci(), false); } } } private BlockEnd iterateBytecodesForBlock(int bci, boolean inliningIntoCurrentBlock) { assert frameState != null; stream.setBCI(bci); BlockBegin block = curBlock; BlockEnd end = null; boolean pushException = block.isExceptionEntry() && block.next() == null; int prevBCI = bci; int endBCI = stream.endBCI(); boolean blockStart = true; while (bci < endBCI) { BlockBegin nextBlock = blockAtOrNull(bci); if (bci == 0 && inliningIntoCurrentBlock) { if (!nextBlock.isParserLoopHeader()) { // Ignore the block boundary of the entry block of a method // being inlined unless the block is a loop header. nextBlock = null; blockStart = false; } } if (nextBlock != null && nextBlock != block) { // we fell through to the next block, add a goto and break end = new Goto(nextBlock, null, false, graph); lastInstr = lastInstr.appendNext(end, prevBCI); break; } // read the opcode int opcode = stream.currentBC(); // push an exception object onto the stack if we are parsing an exception handler if (pushException) { frameState.apush(append(new ExceptionObject(graph))); pushException = false; } traceState(); traceInstruction(bci, stream, opcode, blockStart); processBytecode(bci, stream, opcode); prevBCI = bci; if (lastInstr instanceof BlockEnd) { end = (BlockEnd) lastInstr; break; } stream.next(); bci = stream.currentBCI(); if (lastInstr instanceof StateSplit) { StateSplit stateSplit = (StateSplit) lastInstr; if (stateSplit.stateAfter() == null && stateSplit.needsStateAfter()) { stateSplit.setStateAfter(frameState.create(bci)); } } blockStart = false; } // if the method terminates, we don't need the stack anymore if (end instanceof Return || end instanceof Throw) { frameState.clearStack(); } // connect to begin and set state // NOTE that inlining may have changed the block we are parsing assert end != null : "end should exist after iterating over bytecodes"; FrameState stateAtEnd = frameState.create(bci()); end.setStateAfter(stateAtEnd); curBlock.setEnd(end); // propagate the state for (BlockBegin succ : end.blockSuccessors()) { assert succ.blockPredecessors().contains(curBlock); succ.mergeOrClone(stateAtEnd, method()); addToWorkList(succ); } return end; } private void traceState() { if (C1XOptions.TraceBytecodeParserLevel >= TRACELEVEL_STATE && !TTY.isSuppressed()) { log.println(String.format("| state [nr locals = %d, stack depth = %d, method = %s]", frameState.localsSize(), frameState.stackSize(), method())); for (int i = 0; i < frameState.localsSize(); ++i) { Value value = frameState.localAt(i); log.println(String.format("| local[%d] = %-8s : %s", i, value == null ? "bogus" : value.kind.javaName, value)); } for (int i = 0; i < frameState.stackSize(); ++i) { Value value = frameState.stackAt(i); log.println(String.format("| stack[%d] = %-8s : %s", i, value == null ? "bogus" : value.kind.javaName, value)); } for (int i = 0; i < frameState.locksSize(); ++i) { Value value = frameState.lockAt(i); log.println(String.format("| lock[%d] = %-8s : %s", i, value == null ? "bogus" : value.kind.javaName, value)); } } } private void processBytecode(int bci, BytecodeStream s, int opcode) { int cpi; // Checkstyle: stop switch (opcode) { case NOP : /* nothing to do */ break; case ACONST_NULL : frameState.apush(appendConstant(CiConstant.NULL_OBJECT)); break; case ICONST_M1 : frameState.ipush(appendConstant(CiConstant.INT_MINUS_1)); break; case ICONST_0 : frameState.ipush(appendConstant(CiConstant.INT_0)); break; case ICONST_1 : frameState.ipush(appendConstant(CiConstant.INT_1)); break; case ICONST_2 : frameState.ipush(appendConstant(CiConstant.INT_2)); break; case ICONST_3 : frameState.ipush(appendConstant(CiConstant.INT_3)); break; case ICONST_4 : frameState.ipush(appendConstant(CiConstant.INT_4)); break; case ICONST_5 : frameState.ipush(appendConstant(CiConstant.INT_5)); break; case LCONST_0 : frameState.lpush(appendConstant(CiConstant.LONG_0)); break; case LCONST_1 : frameState.lpush(appendConstant(CiConstant.LONG_1)); break; case FCONST_0 : frameState.fpush(appendConstant(CiConstant.FLOAT_0)); break; case FCONST_1 : frameState.fpush(appendConstant(CiConstant.FLOAT_1)); break; case FCONST_2 : frameState.fpush(appendConstant(CiConstant.FLOAT_2)); break; case DCONST_0 : frameState.dpush(appendConstant(CiConstant.DOUBLE_0)); break; case DCONST_1 : frameState.dpush(appendConstant(CiConstant.DOUBLE_1)); break; case BIPUSH : frameState.ipush(appendConstant(CiConstant.forInt(s.readByte()))); break; case SIPUSH : frameState.ipush(appendConstant(CiConstant.forInt(s.readShort()))); break; case LDC : // fall through case LDC_W : // fall through case LDC2_W : genLoadConstant(s.readCPI()); break; case ILOAD : loadLocal(s.readLocalIndex(), CiKind.Int); break; case LLOAD : loadLocal(s.readLocalIndex(), CiKind.Long); break; case FLOAD : loadLocal(s.readLocalIndex(), CiKind.Float); break; case DLOAD : loadLocal(s.readLocalIndex(), CiKind.Double); break; case ALOAD : loadLocal(s.readLocalIndex(), CiKind.Object); break; case ILOAD_0 : // fall through case ILOAD_1 : // fall through case ILOAD_2 : // fall through case ILOAD_3 : loadLocal(opcode - ILOAD_0, CiKind.Int); break; case LLOAD_0 : // fall through case LLOAD_1 : // fall through case LLOAD_2 : // fall through case LLOAD_3 : loadLocal(opcode - LLOAD_0, CiKind.Long); break; case FLOAD_0 : // fall through case FLOAD_1 : // fall through case FLOAD_2 : // fall through case FLOAD_3 : loadLocal(opcode - FLOAD_0, CiKind.Float); break; case DLOAD_0 : // fall through case DLOAD_1 : // fall through case DLOAD_2 : // fall through case DLOAD_3 : loadLocal(opcode - DLOAD_0, CiKind.Double); break; case ALOAD_0 : // fall through case ALOAD_1 : // fall through case ALOAD_2 : // fall through case ALOAD_3 : loadLocal(opcode - ALOAD_0, CiKind.Object); break; case IALOAD : genLoadIndexed(CiKind.Int ); break; case LALOAD : genLoadIndexed(CiKind.Long ); break; case FALOAD : genLoadIndexed(CiKind.Float ); break; case DALOAD : genLoadIndexed(CiKind.Double); break; case AALOAD : genLoadIndexed(CiKind.Object); break; case BALOAD : genLoadIndexed(CiKind.Byte ); break; case CALOAD : genLoadIndexed(CiKind.Char ); break; case SALOAD : genLoadIndexed(CiKind.Short ); break; case ISTORE : storeLocal(CiKind.Int, s.readLocalIndex()); break; case LSTORE : storeLocal(CiKind.Long, s.readLocalIndex()); break; case FSTORE : storeLocal(CiKind.Float, s.readLocalIndex()); break; case DSTORE : storeLocal(CiKind.Double, s.readLocalIndex()); break; case ASTORE : storeLocal(CiKind.Object, s.readLocalIndex()); break; case ISTORE_0 : // fall through case ISTORE_1 : // fall through case ISTORE_2 : // fall through case ISTORE_3 : storeLocal(CiKind.Int, opcode - ISTORE_0); break; case LSTORE_0 : // fall through case LSTORE_1 : // fall through case LSTORE_2 : // fall through case LSTORE_3 : storeLocal(CiKind.Long, opcode - LSTORE_0); break; case FSTORE_0 : // fall through case FSTORE_1 : // fall through case FSTORE_2 : // fall through case FSTORE_3 : storeLocal(CiKind.Float, opcode - FSTORE_0); break; case DSTORE_0 : // fall through case DSTORE_1 : // fall through case DSTORE_2 : // fall through case DSTORE_3 : storeLocal(CiKind.Double, opcode - DSTORE_0); break; case ASTORE_0 : // fall through case ASTORE_1 : // fall through case ASTORE_2 : // fall through case ASTORE_3 : storeLocal(CiKind.Object, opcode - ASTORE_0); break; case IASTORE : genStoreIndexed(CiKind.Int ); break; case LASTORE : genStoreIndexed(CiKind.Long ); break; case FASTORE : genStoreIndexed(CiKind.Float ); break; case DASTORE : genStoreIndexed(CiKind.Double); break; case AASTORE : genStoreIndexed(CiKind.Object); break; case BASTORE : genStoreIndexed(CiKind.Byte ); break; case CASTORE : genStoreIndexed(CiKind.Char ); break; case SASTORE : genStoreIndexed(CiKind.Short ); break; case POP : // fall through case POP2 : // fall through case DUP : // fall through case DUP_X1 : // fall through case DUP_X2 : // fall through case DUP2 : // fall through case DUP2_X1 : // fall through case DUP2_X2 : // fall through case SWAP : stackOp(opcode); break; case IADD : // fall through case ISUB : // fall through case IMUL : genArithmeticOp(CiKind.Int, opcode); break; case IDIV : // fall through case IREM : genArithmeticOp(CiKind.Int, opcode, true); break; case LADD : // fall through case LSUB : // fall through case LMUL : genArithmeticOp(CiKind.Long, opcode); break; case LDIV : // fall through case LREM : genArithmeticOp(CiKind.Long, opcode, true); break; case FADD : // fall through case FSUB : // fall through case FMUL : // fall through case FDIV : // fall through case FREM : genArithmeticOp(CiKind.Float, opcode); break; case DADD : // fall through case DSUB : // fall through case DMUL : // fall through case DDIV : // fall through case DREM : genArithmeticOp(CiKind.Double, opcode); break; case INEG : genNegateOp(CiKind.Int); break; case LNEG : genNegateOp(CiKind.Long); break; case FNEG : genNegateOp(CiKind.Float); break; case DNEG : genNegateOp(CiKind.Double); break; case ISHL : // fall through case ISHR : // fall through case IUSHR : genShiftOp(CiKind.Int, opcode); break; case IAND : // fall through case IOR : // fall through case IXOR : genLogicOp(CiKind.Int, opcode); break; case LSHL : // fall through case LSHR : // fall through case LUSHR : genShiftOp(CiKind.Long, opcode); break; case LAND : // fall through case LOR : // fall through case LXOR : genLogicOp(CiKind.Long, opcode); break; case IINC : genIncrement(); break; case I2L : genConvert(opcode, CiKind.Int , CiKind.Long ); break; case I2F : genConvert(opcode, CiKind.Int , CiKind.Float ); break; case I2D : genConvert(opcode, CiKind.Int , CiKind.Double); break; case L2I : genConvert(opcode, CiKind.Long , CiKind.Int ); break; case L2F : genConvert(opcode, CiKind.Long , CiKind.Float ); break; case L2D : genConvert(opcode, CiKind.Long , CiKind.Double); break; case F2I : genConvert(opcode, CiKind.Float , CiKind.Int ); break; case F2L : genConvert(opcode, CiKind.Float , CiKind.Long ); break; case F2D : genConvert(opcode, CiKind.Float , CiKind.Double); break; case D2I : genConvert(opcode, CiKind.Double, CiKind.Int ); break; case D2L : genConvert(opcode, CiKind.Double, CiKind.Long ); break; case D2F : genConvert(opcode, CiKind.Double, CiKind.Float ); break; case I2B : genConvert(opcode, CiKind.Int , CiKind.Byte ); break; case I2C : genConvert(opcode, CiKind.Int , CiKind.Char ); break; case I2S : genConvert(opcode, CiKind.Int , CiKind.Short ); break; case LCMP : genCompareOp(CiKind.Long, opcode, CiKind.Int); break; case FCMPL : genCompareOp(CiKind.Float, opcode, CiKind.Int); break; case FCMPG : genCompareOp(CiKind.Float, opcode, CiKind.Int); break; case DCMPL : genCompareOp(CiKind.Double, opcode, CiKind.Int); break; case DCMPG : genCompareOp(CiKind.Double, opcode, CiKind.Int); break; case IFEQ : genIfZero(Condition.EQ); break; case IFNE : genIfZero(Condition.NE); break; case IFLT : genIfZero(Condition.LT); break; case IFGE : genIfZero(Condition.GE); break; case IFGT : genIfZero(Condition.GT); break; case IFLE : genIfZero(Condition.LE); break; case IF_ICMPEQ : genIfSame(CiKind.Int, Condition.EQ); break; case IF_ICMPNE : genIfSame(CiKind.Int, Condition.NE); break; case IF_ICMPLT : genIfSame(CiKind.Int, Condition.LT); break; case IF_ICMPGE : genIfSame(CiKind.Int, Condition.GE); break; case IF_ICMPGT : genIfSame(CiKind.Int, Condition.GT); break; case IF_ICMPLE : genIfSame(CiKind.Int, Condition.LE); break; case IF_ACMPEQ : genIfSame(frameState.peekKind(), Condition.EQ); break; case IF_ACMPNE : genIfSame(frameState.peekKind(), Condition.NE); break; case GOTO : genGoto(s.currentBCI(), s.readBranchDest()); break; case JSR : genJsr(s.readBranchDest()); break; case RET : genRet(s.readLocalIndex()); break; case TABLESWITCH : genTableswitch(); break; case LOOKUPSWITCH : genLookupswitch(); break; case IRETURN : genReturn(frameState.ipop()); break; case LRETURN : genReturn(frameState.lpop()); break; case FRETURN : genReturn(frameState.fpop()); break; case DRETURN : genReturn(frameState.dpop()); break; case ARETURN : genReturn(frameState.apop()); break; case RETURN : genReturn(null ); break; case GETSTATIC : cpi = s.readCPI(); genGetStatic(cpi, constantPool().lookupField(cpi, opcode)); break; case PUTSTATIC : cpi = s.readCPI(); genPutStatic(cpi, constantPool().lookupField(cpi, opcode)); break; case GETFIELD : cpi = s.readCPI(); genGetField(cpi, constantPool().lookupField(cpi, opcode)); break; case PUTFIELD : cpi = s.readCPI(); genPutField(cpi, constantPool().lookupField(cpi, opcode)); break; case INVOKEVIRTUAL : cpi = s.readCPI(); genInvokeVirtual(constantPool().lookupMethod(cpi, opcode), cpi, constantPool()); break; case INVOKESPECIAL : cpi = s.readCPI(); genInvokeSpecial(constantPool().lookupMethod(cpi, opcode), null, cpi, constantPool()); break; case INVOKESTATIC : cpi = s.readCPI(); genInvokeStatic(constantPool().lookupMethod(cpi, opcode), cpi, constantPool()); break; case INVOKEINTERFACE: cpi = s.readCPI(); genInvokeInterface(constantPool().lookupMethod(cpi, opcode), cpi, constantPool()); break; case NEW : genNewInstance(s.readCPI()); break; case NEWARRAY : genNewTypeArray(s.readLocalIndex()); break; case ANEWARRAY : genNewObjectArray(s.readCPI()); break; case ARRAYLENGTH : genArrayLength(); break; case ATHROW : genThrow(s.currentBCI()); break; case CHECKCAST : genCheckCast(); break; case INSTANCEOF : genInstanceOf(); break; case MONITORENTER : genMonitorEnter(frameState.apop(), s.currentBCI()); break; case MONITOREXIT : genMonitorExit(frameState.apop(), s.currentBCI()); break; case MULTIANEWARRAY : genNewMultiArray(s.readCPI()); break; case IFNULL : genIfNull(Condition.EQ); break; case IFNONNULL : genIfNull(Condition.NE); break; case GOTO_W : genGoto(s.currentBCI(), s.readFarBranchDest()); break; case JSR_W : genJsr(s.readFarBranchDest()); break; case BREAKPOINT: throw new CiBailout("concurrent setting of breakpoint"); default: throw new CiBailout("Unsupported opcode " + opcode + " (" + nameOf(opcode) + ") [bci=" + bci + "]"); } // Checkstyle: resume } private void traceInstruction(int bci, BytecodeStream s, int opcode, boolean blockStart) { if (C1XOptions.TraceBytecodeParserLevel >= TRACELEVEL_INSTRUCTIONS && !TTY.isSuppressed()) { StringBuilder sb = new StringBuilder(40); sb.append(blockStart ? '+' : '|'); if (bci < 10) { sb.append(" "); } else if (bci < 100) { sb.append(' '); } sb.append(bci).append(": ").append(Bytecodes.nameOf(opcode)); for (int i = bci + 1; i < s.nextBCI(); ++i) { sb.append(' ').append(s.readUByte(i)); } log.println(sb.toString()); } } private void genArrayLength() { frameState.ipush(append(new ArrayLength(frameState.apop(), graph))); } private RiConstantPool constantPool() { return constantPool; } /** * Adds an exception handler. * @param handler the handler to add */ private void addExceptionHandler(ExceptionHandler handler) { if (exceptionHandlers == null) { exceptionHandlers = new ArrayList<ExceptionHandler>(); } exceptionHandlers.add(handler); flags |= Flag.HasHandler.mask; } /** * Adds a block to the worklist, if it is not already in the worklist. * This method will keep the worklist topologically stored (i.e. the lower * DFNs are earlier in the list). * @param block the block to add to the work list */ private void addToWorkList(BlockBegin block) { if (!block.isOnWorkList()) { block.setOnWorkList(true); sortIntoWorkList(block); } } private void sortIntoWorkList(BlockBegin top) { // XXX: this is O(n), since the whole list is sorted; a heap could achieve O(nlogn), but // would only pay off for large worklists if (workList == null) { // need to allocate the worklist workList = new BlockBegin[5]; } else if (workListIndex == workList.length) { // need to grow the worklist BlockBegin[] nworkList = new BlockBegin[workList.length * 3]; System.arraycopy(workList, 0, nworkList, 0, workList.length); workList = nworkList; } // put the block at the end of the array workList[workListIndex++] = top; int dfn = top.depthFirstNumber(); assert dfn >= 0 : top + " does not have a depth first number"; int i = workListIndex - 2; // push top towards the beginning of the array for (; i >= 0; i--) { BlockBegin b = workList[i]; if (b.depthFirstNumber() >= dfn) { break; // already in the right position } workList[i + 1] = b; // bubble b down by one workList[i] = top; // and overwrite it with top } } /** * Removes the next block from the worklist. The list is sorted topologically, so the * block with the lowest depth first number in the list will be removed and returned. * @return the next block from the worklist; {@code null} if there are no blocks * in the worklist */ private BlockBegin removeFromWorkList() { if (workListIndex == 0) { return null; } // pop the last item off the end return workList[--workListIndex]; } /** * Checks whether this graph has any handlers. * @return {@code true} if there are any exception handlers */ private boolean hasHandler() { return (flags & Flag.HasHandler.mask) != 0; } /** * Checks whether this graph can contain safepoints. */ private boolean noSafepoints() { return (flags & Flag.NoSafepoints.mask) != 0; } }