Mercurial > hg > graal-compiler
view graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/gen/LIRGenerator.java @ 14810:eab93bf521d7
Introduce LIRGenResLowerable.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Tue, 18 Mar 2014 14:48:39 +0100 |
parents | 73774616a6b3 |
children | 20dcae7f93eb |
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/* * Copyright (c) 2009, 2012, 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.oracle.graal.compiler.gen; import static com.oracle.graal.api.code.ValueUtil.*; import static com.oracle.graal.api.meta.Value.*; import static com.oracle.graal.lir.LIR.*; import static com.oracle.graal.lir.LIRValueUtil.*; import static com.oracle.graal.nodes.ConstantNode.*; import static com.oracle.graal.phases.GraalOptions.*; import java.util.*; import java.util.Map.Entry; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.asm.*; import com.oracle.graal.compiler.target.*; import com.oracle.graal.debug.*; import com.oracle.graal.graph.*; import com.oracle.graal.lir.*; import com.oracle.graal.lir.StandardOp.BlockEndOp; import com.oracle.graal.lir.StandardOp.JumpOp; import com.oracle.graal.lir.StandardOp.LabelOp; import com.oracle.graal.lir.StandardOp.NoOp; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.PhiNode.PhiType; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.cfg.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.virtual.*; import com.oracle.graal.options.*; import com.oracle.graal.phases.util.*; /** * This class traverses the HIR instructions and generates LIR instructions from them. */ public abstract class LIRGenerator implements LIRGeneratorTool, LIRTypeTool { public static class Options { // @formatter:off @Option(help = "Print HIR along side LIR as the latter is generated") public static final OptionValue<Boolean> PrintIRWithLIR = new OptionValue<>(false); @Option(help = "The trace level for the LIR generator") public static final OptionValue<Integer> TraceLIRGeneratorLevel = new OptionValue<>(0); // @formatter:on } private final Providers providers; private final CallingConvention cc; private final NodeMap<Value> nodeOperands; private final DebugInfoBuilder debugInfoBuilder; protected Block currentBlock; private final int traceLevel; private final boolean printIRWithLIR; /** * Handle for an operation that loads a constant into a variable. The operation starts in the * first block where the constant is used but will eventually be * {@linkplain LIRGenerator#insertConstantLoads() moved} to a block dominating all usages of the * constant. */ public static class LoadConstant implements Comparable<LoadConstant> { /** * The index of {@link #op} within {@link #block}'s instruction list or -1 if {@code op} is * to be moved to a dominator block. */ int index; /** * The operation that loads the constant. */ private final LIRInstruction op; /** * The block that does or will contain {@link #op}. This is initially the block where the * first usage of the constant is seen during LIR generation. */ private Block block; /** * The variable into which the constant is loaded. */ private final Variable variable; public LoadConstant(Variable variable, Block block, int index, LIRInstruction op) { this.variable = variable; this.block = block; this.index = index; this.op = op; } /** * Sorts {@link LoadConstant} objects according to their enclosing blocks. This is used to * group loads per block in {@link LIRGenerator#insertConstantLoads()}. */ public int compareTo(LoadConstant o) { if (block.getId() < o.block.getId()) { return -1; } if (block.getId() > o.block.getId()) { return 1; } return 0; } @Override public String toString() { return block + "#" + op; } /** * Removes the {@link #op} from its original location if it is still at that location. */ public void unpin(LIR lir) { if (index >= 0) { // Replace the move with a filler op so that the operation // list does not need to be adjusted. List<LIRInstruction> instructions = lir.getLIRforBlock(block); instructions.set(index, new NoOp(null, -1)); index = -1; } } } private Map<Constant, LoadConstant> constantLoads; private ValueNode currentInstruction; private ValueNode lastInstructionPrinted; // Debugging only protected LIRGenerationResult res; /** * Checks whether the supplied constant can be used without loading it into a register for store * operations, i.e., on the right hand side of a memory access. * * @param c The constant to check. * @return True if the constant can be used directly, false if the constant needs to be in a * register. */ public abstract boolean canStoreConstant(Constant c, boolean isCompressed); public LIRGenerator(StructuredGraph graph, Providers providers, CallingConvention cc, LIRGenerationResult res) { this.res = res; this.providers = providers; this.cc = cc; this.nodeOperands = graph.createNodeMap(); this.debugInfoBuilder = createDebugInfoBuilder(nodeOperands); this.traceLevel = Options.TraceLIRGeneratorLevel.getValue(); this.printIRWithLIR = Options.PrintIRWithLIR.getValue(); } /** * Returns true if the redundant move elimination optimization should be done after register * allocation. */ public boolean canEliminateRedundantMoves() { return true; } @SuppressWarnings("hiding") protected DebugInfoBuilder createDebugInfoBuilder(NodeMap<Value> nodeOperands) { return new DebugInfoBuilder(nodeOperands); } @Override public TargetDescription target() { return getCodeCache().getTarget(); } protected Providers getProviders() { return providers; } @Override public MetaAccessProvider getMetaAccess() { return providers.getMetaAccess(); } @Override public CodeCacheProvider getCodeCache() { return providers.getCodeCache(); } @Override public ForeignCallsProvider getForeignCalls() { return providers.getForeignCalls(); } /** * Returns the operand that has been previously initialized by * {@link #setResult(ValueNode, Value)} with the result of an instruction. * * @param node A node that produces a result value. */ @Override public Value operand(ValueNode node) { if (nodeOperands == null) { return null; } Value operand = nodeOperands.get(node); if (operand == null) { return getConstantOperand(node); } return operand; } private Value getConstantOperand(ValueNode node) { if (!ConstantNodeRecordsUsages) { Constant value = node.asConstant(); if (value != null) { if (canInlineConstant(value)) { return setResult(node, value); } else { Variable loadedValue; if (constantLoads == null) { constantLoads = new HashMap<>(); } LoadConstant load = constantLoads.get(value); if (load == null) { int index = res.getLIR().getLIRforBlock(currentBlock).size(); loadedValue = emitMove(value); LIRInstruction op = res.getLIR().getLIRforBlock(currentBlock).get(index); constantLoads.put(value, new LoadConstant(loadedValue, currentBlock, index, op)); } else { Block dominator = ControlFlowGraph.commonDominator(load.block, currentBlock); loadedValue = load.variable; if (dominator != load.block) { load.unpin(res.getLIR()); } else { assert load.block != currentBlock || load.index < res.getLIR().getLIRforBlock(currentBlock).size(); } load.block = dominator; } return loadedValue; } } } else { // Constant is loaded by ConstantNode.generate() } return null; } public ValueNode valueForOperand(Value value) { for (Entry<Node, Value> entry : nodeOperands.entries()) { if (entry.getValue().equals(value)) { return (ValueNode) entry.getKey(); } } return null; } /** * Creates a new {@linkplain Variable variable}. * * @param platformKind The kind of the new variable. * @return a new variable */ @Override public Variable newVariable(PlatformKind platformKind) { return new Variable(platformKind, res.getLIR().nextVariable()); } @Override public RegisterAttributes attributes(Register register) { return res.getFrameMap().registerConfig.getAttributesMap()[register.number]; } @Override public Value setResult(ValueNode x, Value operand) { assert (!isRegister(operand) || !attributes(asRegister(operand)).isAllocatable()); assert nodeOperands == null || nodeOperands.get(x) == null : "operand cannot be set twice"; assert operand != null && isLegal(operand) : "operand must be legal"; assert operand.getKind().getStackKind() == x.kind() || x.kind() == Kind.Illegal : operand.getKind().getStackKind() + " must match " + x.kind(); assert !(x instanceof VirtualObjectNode); nodeOperands.set(x, operand); return operand; } @Override public abstract Variable emitMove(Value input); public AllocatableValue asAllocatable(Value value) { if (isAllocatableValue(value)) { return asAllocatableValue(value); } else { return emitMove(value); } } public Variable load(Value value) { if (!isVariable(value)) { return emitMove(value); } return (Variable) value; } public Value loadNonConst(Value value) { if (isConstant(value) && !canInlineConstant((Constant) value)) { return emitMove(value); } return value; } public LabelRef getLIRBlock(FixedNode b) { assert res.getLIR().getControlFlowGraph() instanceof ControlFlowGraph; Block result = ((ControlFlowGraph) res.getLIR().getControlFlowGraph()).blockFor(b); int suxIndex = currentBlock.getSuccessors().indexOf(result); assert suxIndex != -1 : "Block not in successor list of current block"; return LabelRef.forSuccessor(res.getLIR(), currentBlock, suxIndex); } /** * Determines if only oop maps are required for the code generated from the LIR. */ protected boolean needOnlyOopMaps() { return false; } public LIRFrameState state(DeoptimizingNode deopt) { if (!deopt.canDeoptimize()) { return null; } return stateFor(deopt.getDeoptimizationState()); } public LIRFrameState stateWithExceptionEdge(DeoptimizingNode deopt, LabelRef exceptionEdge) { if (!deopt.canDeoptimize()) { return null; } return stateForWithExceptionEdge(deopt.getDeoptimizationState(), exceptionEdge); } public LIRFrameState stateFor(FrameState state) { return stateForWithExceptionEdge(state, null); } public LIRFrameState stateForWithExceptionEdge(FrameState state, LabelRef exceptionEdge) { if (needOnlyOopMaps()) { return new LIRFrameState(null, null, null); } assert state != null; return getDebugInfoBuilder().build(state, exceptionEdge); } /** * Gets the ABI specific operand used to return a value of a given kind from a method. * * @param kind the kind of value being returned * @return the operand representing the ABI defined location used return a value of kind * {@code kind} */ public AllocatableValue resultOperandFor(Kind kind) { if (kind == Kind.Void) { return ILLEGAL; } return res.getFrameMap().registerConfig.getReturnRegister(kind).asValue(kind); } public void append(LIRInstruction op) { if (printIRWithLIR && !TTY.isSuppressed()) { if (currentInstruction != null && lastInstructionPrinted != currentInstruction) { lastInstructionPrinted = currentInstruction; InstructionPrinter ip = new InstructionPrinter(TTY.out()); ip.printInstructionListing(currentInstruction); } TTY.println(op.toStringWithIdPrefix()); TTY.println(); } assert LIRVerifier.verify(op); res.getLIR().getLIRforBlock(currentBlock).add(op); } public void doBlock(Block block, StructuredGraph graph, BlockMap<List<ScheduledNode>> blockMap) { if (printIRWithLIR) { TTY.print(block.toString()); } currentBlock = block; // set up the list of LIR instructions assert res.getLIR().getLIRforBlock(block) == null : "LIR list already computed for this block"; res.getLIR().setLIRforBlock(block, new ArrayList<LIRInstruction>()); append(new LabelOp(new Label(block.getId()), block.isAligned())); if (traceLevel >= 1) { TTY.println("BEGIN Generating LIR for block B" + block.getId()); } if (block == res.getLIR().getControlFlowGraph().getStartBlock()) { assert block.getPredecessorCount() == 0; emitPrologue(graph); } else { assert block.getPredecessorCount() > 0; } List<ScheduledNode> nodes = blockMap.get(block); for (int i = 0; i < nodes.size(); i++) { Node instr = nodes.get(i); if (traceLevel >= 3) { TTY.println("LIRGen for " + instr); } if (!ConstantNodeRecordsUsages && instr instanceof ConstantNode) { // Loading of constants is done lazily by operand() } else if (instr instanceof ValueNode) { ValueNode valueNode = (ValueNode) instr; if (operand(valueNode) == null) { if (!peephole(valueNode)) { try { doRoot((ValueNode) instr); } catch (GraalInternalError e) { throw e.addContext(instr); } catch (Throwable e) { throw new GraalInternalError(e).addContext(instr); } } } else { // There can be cases in which the result of an instruction is already set // before by other instructions. } } } if (!hasBlockEnd(block)) { NodeClassIterable successors = block.getEndNode().successors(); assert successors.count() == block.getSuccessorCount(); if (block.getSuccessorCount() != 1) { /* * If we have more than one successor, we cannot just use the first one. Since * successors are unordered, this would be a random choice. */ throw new GraalInternalError("Block without BlockEndOp: " + block.getEndNode()); } emitJump(getLIRBlock((FixedNode) successors.first())); } assert verifyBlock(res.getLIR(), block); if (traceLevel >= 1) { TTY.println("END Generating LIR for block B" + block.getId()); } currentBlock = null; if (printIRWithLIR) { TTY.println(); } } protected abstract boolean peephole(ValueNode valueNode); private boolean hasBlockEnd(Block block) { List<LIRInstruction> ops = res.getLIR().getLIRforBlock(block); if (ops.size() == 0) { return false; } return ops.get(ops.size() - 1) instanceof BlockEndOp; } private void doRoot(ValueNode instr) { if (traceLevel >= 2) { TTY.println("Emitting LIR for instruction " + instr); } currentInstruction = instr; Debug.log("Visiting %s", instr); emitNode(instr); Debug.log("Operand for %s = %s", instr, operand(instr)); } protected void emitNode(ValueNode node) { if (Debug.isLogEnabled() && node.stamp() instanceof IllegalStamp) { Debug.log("This node has invalid type, we are emitting dead code(?): %s", node); } if (node instanceof LIRGenLowerable) { ((LIRGenLowerable) node).generate(this); } else if (node instanceof LIRGenResLowerable) { ((LIRGenResLowerable) node).generate(this, res); } else if (node instanceof LIRLowerable) { ((LIRLowerable) node).generate(this); } else if (node instanceof ArithmeticLIRLowerable) { ((ArithmeticLIRLowerable) node).generate(this); } else { throw GraalInternalError.shouldNotReachHere("node is not LIRLowerable: " + node); } } protected void emitPrologue(StructuredGraph graph) { CallingConvention incomingArguments = getCallingConvention(); Value[] params = new Value[incomingArguments.getArgumentCount()]; for (int i = 0; i < params.length; i++) { params[i] = toStackKind(incomingArguments.getArgument(i)); if (ValueUtil.isStackSlot(params[i])) { StackSlot slot = ValueUtil.asStackSlot(params[i]); if (slot.isInCallerFrame() && !res.getLIR().hasArgInCallerFrame()) { res.getLIR().setHasArgInCallerFrame(); } } } emitIncomingValues(params); for (ParameterNode param : graph.getNodes(ParameterNode.class)) { Value paramValue = params[param.index()]; assert paramValue.getKind() == param.kind().getStackKind(); setResult(param, emitMove(paramValue)); } } public void emitIncomingValues(Value[] params) { ((LabelOp) res.getLIR().getLIRforBlock(currentBlock).get(0)).setIncomingValues(params); } @Override public void visitReturn(ReturnNode x) { AllocatableValue operand = ILLEGAL; if (x.result() != null) { operand = resultOperandFor(x.result().kind()); emitMove(operand, operand(x.result())); } emitReturn(operand); } protected abstract void emitReturn(Value input); @Override public void visitMerge(MergeNode x) { } @Override public void visitEndNode(AbstractEndNode end) { moveToPhi(end.merge(), end); } /** * Runtime specific classes can override this to insert a safepoint at the end of a loop. */ @Override public void visitLoopEnd(LoopEndNode x) { } private void moveToPhi(MergeNode merge, AbstractEndNode pred) { if (traceLevel >= 1) { TTY.println("MOVE TO PHI from " + pred + " to " + merge); } PhiResolver resolver = new PhiResolver(this); for (PhiNode phi : merge.phis()) { if (phi.type() == PhiType.Value) { ValueNode curVal = phi.valueAt(pred); resolver.move(operandForPhi(phi), operand(curVal)); } } resolver.dispose(); append(new JumpOp(getLIRBlock(merge))); } protected PlatformKind getPhiKind(PhiNode phi) { return phi.kind(); } private Value operandForPhi(PhiNode phi) { assert phi.type() == PhiType.Value : "wrong phi type: " + phi; Value result = operand(phi); if (result == null) { // allocate a variable for this phi Variable newOperand = newVariable(getPhiKind(phi)); setResult(phi, newOperand); return newOperand; } else { return result; } } @Override public void emitIf(IfNode x) { emitBranch(x.condition(), getLIRBlock(x.trueSuccessor()), getLIRBlock(x.falseSuccessor()), x.probability(x.trueSuccessor())); } public void emitBranch(LogicNode node, LabelRef trueSuccessor, LabelRef falseSuccessor, double trueSuccessorProbability) { if (node instanceof IsNullNode) { emitNullCheckBranch((IsNullNode) node, trueSuccessor, falseSuccessor, trueSuccessorProbability); } else if (node instanceof CompareNode) { emitCompareBranch((CompareNode) node, trueSuccessor, falseSuccessor, trueSuccessorProbability); } else if (node instanceof LogicConstantNode) { emitConstantBranch(((LogicConstantNode) node).getValue(), trueSuccessor, falseSuccessor); } else if (node instanceof IntegerTestNode) { emitIntegerTestBranch((IntegerTestNode) node, trueSuccessor, falseSuccessor, trueSuccessorProbability); } else { throw GraalInternalError.unimplemented(node.toString()); } } private void emitNullCheckBranch(IsNullNode node, LabelRef trueSuccessor, LabelRef falseSuccessor, double trueSuccessorProbability) { emitCompareBranch(operand(node.object()), Constant.NULL_OBJECT, Condition.EQ, false, trueSuccessor, falseSuccessor, trueSuccessorProbability); } public void emitCompareBranch(CompareNode compare, LabelRef trueSuccessor, LabelRef falseSuccessor, double trueSuccessorProbability) { emitCompareBranch(operand(compare.x()), operand(compare.y()), compare.condition(), compare.unorderedIsTrue(), trueSuccessor, falseSuccessor, trueSuccessorProbability); } public void emitIntegerTestBranch(IntegerTestNode test, LabelRef trueSuccessor, LabelRef falseSuccessor, double trueSuccessorProbability) { emitIntegerTestBranch(operand(test.x()), operand(test.y()), trueSuccessor, falseSuccessor, trueSuccessorProbability); } public void emitConstantBranch(boolean value, LabelRef trueSuccessorBlock, LabelRef falseSuccessorBlock) { LabelRef block = value ? trueSuccessorBlock : falseSuccessorBlock; emitJump(block); } @Override public void emitConditional(ConditionalNode conditional) { Value tVal = operand(conditional.trueValue()); Value fVal = operand(conditional.falseValue()); setResult(conditional, emitConditional(conditional.condition(), tVal, fVal)); } public Variable emitConditional(LogicNode node, Value trueValue, Value falseValue) { if (node instanceof IsNullNode) { IsNullNode isNullNode = (IsNullNode) node; return emitConditionalMove(operand(isNullNode.object()), Constant.NULL_OBJECT, Condition.EQ, false, trueValue, falseValue); } else if (node instanceof CompareNode) { CompareNode compare = (CompareNode) node; return emitConditionalMove(operand(compare.x()), operand(compare.y()), compare.condition(), compare.unorderedIsTrue(), trueValue, falseValue); } else if (node instanceof LogicConstantNode) { return emitMove(((LogicConstantNode) node).getValue() ? trueValue : falseValue); } else if (node instanceof IntegerTestNode) { IntegerTestNode test = (IntegerTestNode) node; return emitIntegerTestMove(operand(test.x()), operand(test.y()), trueValue, falseValue); } else { throw GraalInternalError.unimplemented(node.toString()); } } public abstract void emitJump(LabelRef label); public abstract void emitCompareBranch(Value left, Value right, Condition cond, boolean unorderedIsTrue, LabelRef trueDestination, LabelRef falseDestination, double trueDestinationProbability); public abstract void emitOverflowCheckBranch(LabelRef overflow, LabelRef noOverflow, double overflowProbability); public abstract void emitIntegerTestBranch(Value left, Value right, LabelRef trueDestination, LabelRef falseDestination, double trueSuccessorProbability); public abstract Variable emitConditionalMove(Value leftVal, Value right, Condition cond, boolean unorderedIsTrue, Value trueValue, Value falseValue); public abstract Variable emitIntegerTestMove(Value leftVal, Value right, Value trueValue, Value falseValue); @Override public void emitInvoke(Invoke x) { LoweredCallTargetNode callTarget = (LoweredCallTargetNode) x.callTarget(); CallingConvention invokeCc = res.getFrameMap().registerConfig.getCallingConvention(callTarget.callType(), x.asNode().stamp().javaType(getMetaAccess()), callTarget.signature(), target(), false); res.getFrameMap().callsMethod(invokeCc); Value[] parameters = visitInvokeArguments(invokeCc, callTarget.arguments()); LabelRef exceptionEdge = null; if (x instanceof InvokeWithExceptionNode) { exceptionEdge = getLIRBlock(((InvokeWithExceptionNode) x).exceptionEdge()); } LIRFrameState callState = stateWithExceptionEdge(x, exceptionEdge); Value result = invokeCc.getReturn(); if (callTarget instanceof DirectCallTargetNode) { emitDirectCall((DirectCallTargetNode) callTarget, result, parameters, AllocatableValue.NONE, callState); } else if (callTarget instanceof IndirectCallTargetNode) { emitIndirectCall((IndirectCallTargetNode) callTarget, result, parameters, AllocatableValue.NONE, callState); } else { throw GraalInternalError.shouldNotReachHere(); } if (isLegal(result)) { setResult(x.asNode(), emitMove(result)); } if (x instanceof InvokeWithExceptionNode) { emitJump(getLIRBlock(((InvokeWithExceptionNode) x).next())); } } protected abstract void emitDirectCall(DirectCallTargetNode callTarget, Value result, Value[] parameters, Value[] temps, LIRFrameState callState); protected abstract void emitIndirectCall(IndirectCallTargetNode callTarget, Value result, Value[] parameters, Value[] temps, LIRFrameState callState); protected abstract void emitForeignCall(ForeignCallLinkage linkage, Value result, Value[] arguments, Value[] temps, LIRFrameState info); protected static AllocatableValue toStackKind(AllocatableValue value) { if (value.getKind().getStackKind() != value.getKind()) { // We only have stack-kinds in the LIR, so convert the operand kind for values from the // calling convention. if (isRegister(value)) { return asRegister(value).asValue(value.getKind().getStackKind()); } else if (isStackSlot(value)) { return StackSlot.get(value.getKind().getStackKind(), asStackSlot(value).getRawOffset(), asStackSlot(value).getRawAddFrameSize()); } else { throw GraalInternalError.shouldNotReachHere(); } } return value; } public Value[] visitInvokeArguments(CallingConvention invokeCc, Collection<ValueNode> arguments) { // for each argument, load it into the correct location Value[] result = new Value[arguments.size()]; int j = 0; for (ValueNode arg : arguments) { if (arg != null) { AllocatableValue operand = toStackKind(invokeCc.getArgument(j)); emitMove(operand, operand(arg)); result[j] = operand; j++; } else { throw GraalInternalError.shouldNotReachHere("I thought we no longer have null entries for two-slot types..."); } } return result; } @Override public Variable emitForeignCall(ForeignCallLinkage linkage, DeoptimizingNode info, Value... args) { LIRFrameState state = null; if (linkage.canDeoptimize()) { if (info != null) { state = stateFor(info.getDeoptimizationState()); } else { assert needOnlyOopMaps(); state = new LIRFrameState(null, null, null); } } // move the arguments into the correct location CallingConvention linkageCc = linkage.getOutgoingCallingConvention(); res.getFrameMap().callsMethod(linkageCc); assert linkageCc.getArgumentCount() == args.length : "argument count mismatch"; Value[] argLocations = new Value[args.length]; for (int i = 0; i < args.length; i++) { Value arg = args[i]; AllocatableValue loc = linkageCc.getArgument(i); emitMove(loc, arg); argLocations[i] = loc; } res.setForeignCall(true); emitForeignCall(linkage, linkageCc.getReturn(), argLocations, linkage.getTemporaries(), state); if (isLegal(linkageCc.getReturn())) { return emitMove(linkageCc.getReturn()); } else { return null; } } /** * This method tries to create a switch implementation that is optimal for the given switch. It * will either generate a sequential if/then/else cascade, a set of range tests or a table * switch. * * If the given switch does not contain int keys, it will always create a sequential * implementation. */ @Override public void emitSwitch(SwitchNode x) { assert x.defaultSuccessor() != null; LabelRef defaultTarget = getLIRBlock(x.defaultSuccessor()); int keyCount = x.keyCount(); if (keyCount == 0) { emitJump(defaultTarget); } else { Variable value = load(operand(x.value())); if (keyCount == 1) { assert defaultTarget != null; double probability = x.probability(x.keySuccessor(0)); emitCompareBranch(load(operand(x.value())), x.keyAt(0), Condition.EQ, false, getLIRBlock(x.keySuccessor(0)), defaultTarget, probability); } else { LabelRef[] keyTargets = new LabelRef[keyCount]; Constant[] keyConstants = new Constant[keyCount]; double[] keyProbabilities = new double[keyCount]; for (int i = 0; i < keyCount; i++) { keyTargets[i] = getLIRBlock(x.keySuccessor(i)); keyConstants[i] = x.keyAt(i); keyProbabilities[i] = x.keyProbability(i); } if (value.getKind() != Kind.Int || !x.isSorted()) { // hopefully only a few entries emitStrategySwitch(new SwitchStrategy.SequentialStrategy(keyProbabilities, keyConstants), value, keyTargets, defaultTarget); } else { emitStrategySwitch(keyConstants, keyProbabilities, keyTargets, defaultTarget, value); } } } } protected void emitStrategySwitch(Constant[] keyConstants, double[] keyProbabilities, LabelRef[] keyTargets, LabelRef defaultTarget, Variable value) { int keyCount = keyConstants.length; SwitchStrategy strategy = SwitchStrategy.getBestStrategy(keyProbabilities, keyConstants, keyTargets); long valueRange = keyConstants[keyCount - 1].asLong() - keyConstants[0].asLong() + 1; double tableSwitchDensity = keyCount / (double) valueRange; /* * This heuristic tries to find a compromise between the effort for the best switch strategy * and the density of a tableswitch. If the effort for the strategy is at least 4, then a * tableswitch is preferred if better than a certain value that starts at 0.5 and lowers * gradually with additional effort. */ if (strategy.getAverageEffort() < 4 || tableSwitchDensity < (1 / Math.sqrt(strategy.getAverageEffort()))) { emitStrategySwitch(strategy, value, keyTargets, defaultTarget); } else { int minValue = keyConstants[0].asInt(); assert valueRange < Integer.MAX_VALUE; LabelRef[] targets = new LabelRef[(int) valueRange]; for (int i = 0; i < valueRange; i++) { targets[i] = defaultTarget; } for (int i = 0; i < keyCount; i++) { targets[keyConstants[i].asInt() - minValue] = keyTargets[i]; } emitTableSwitch(minValue, defaultTarget, targets, value); } } protected abstract void emitStrategySwitch(SwitchStrategy strategy, Variable key, LabelRef[] keyTargets, LabelRef defaultTarget); protected abstract void emitTableSwitch(int lowKey, LabelRef defaultTarget, LabelRef[] targets, Value key); public final NodeMap<Value> getNodeOperands() { return nodeOperands; } public CallingConvention getCallingConvention() { return cc; } public DebugInfoBuilder getDebugInfoBuilder() { return debugInfoBuilder; } @Override public void beforeRegisterAllocation() { insertConstantLoads(); } /** * Moves deferred {@linkplain LoadConstant loads} of constants into blocks dominating all usages * of the constant. Any operations inserted into a block are guaranteed to be immediately prior * to the first control flow instruction near the end of the block. */ private void insertConstantLoads() { if (constantLoads != null) { // Remove loads where all usages are in the same block. for (Iterator<Map.Entry<Constant, LoadConstant>> iter = constantLoads.entrySet().iterator(); iter.hasNext();) { LoadConstant lc = iter.next().getValue(); // Move loads of constant outside of loops if (OptScheduleOutOfLoops.getValue()) { Block outOfLoopDominator = lc.block; while (outOfLoopDominator.getLoop() != null) { outOfLoopDominator = outOfLoopDominator.getDominator(); } if (outOfLoopDominator != lc.block) { lc.unpin(res.getLIR()); lc.block = outOfLoopDominator; } } if (lc.index != -1) { assert res.getLIR().getLIRforBlock(lc.block).get(lc.index) == lc.op; iter.remove(); } } if (constantLoads.isEmpty()) { return; } // Sorting groups the loads per block. LoadConstant[] groupedByBlock = constantLoads.values().toArray(new LoadConstant[constantLoads.size()]); Arrays.sort(groupedByBlock); int groupBegin = 0; while (true) { int groupEnd = groupBegin + 1; Block block = groupedByBlock[groupBegin].block; while (groupEnd < groupedByBlock.length && groupedByBlock[groupEnd].block == block) { groupEnd++; } int groupSize = groupEnd - groupBegin; List<LIRInstruction> ops = res.getLIR().getLIRforBlock(block); int lastIndex = ops.size() - 1; assert ops.get(lastIndex) instanceof BlockEndOp; int insertionIndex = lastIndex; for (int i = Math.max(0, lastIndex - MAX_EXCEPTION_EDGE_OP_DISTANCE_FROM_END); i < lastIndex; i++) { if (getExceptionEdge(ops.get(i)) != null) { insertionIndex = i; break; } } if (groupSize == 1) { ops.add(insertionIndex, groupedByBlock[groupBegin].op); } else { assert groupSize > 1; List<LIRInstruction> moves = new ArrayList<>(groupSize); for (int i = groupBegin; i < groupEnd; i++) { moves.add(groupedByBlock[i].op); } ops.addAll(insertionIndex, moves); } if (groupEnd == groupedByBlock.length) { break; } groupBegin = groupEnd; } constantLoads = null; } } /** * Gets a garbage value for a given kind. */ protected Constant zapValueForKind(PlatformKind kind) { long dead = 0xDEADDEADDEADDEADL; switch ((Kind) kind) { case Boolean: return Constant.FALSE; case Byte: return Constant.forByte((byte) dead); case Char: return Constant.forChar((char) dead); case Short: return Constant.forShort((short) dead); case Int: return Constant.forInt((int) dead); case Double: return Constant.forDouble(Double.longBitsToDouble(dead)); case Float: return Constant.forFloat(Float.intBitsToFloat((int) dead)); case Long: return Constant.forLong(dead); case Object: return Constant.NULL_OBJECT; default: throw new IllegalArgumentException(kind.toString()); } } /** * Default implementation: Return the Java stack kind for each stamp. */ public PlatformKind getPlatformKind(Stamp stamp) { return stamp.getPlatformKind(this); } public PlatformKind getIntegerKind(int bits, boolean unsigned) { if (bits > 32) { return Kind.Long; } else { return Kind.Int; } } public PlatformKind getFloatingKind(int bits) { switch (bits) { case 32: return Kind.Float; case 64: return Kind.Double; default: throw GraalInternalError.shouldNotReachHere(); } } public PlatformKind getObjectKind() { return Kind.Object; } public abstract void emitBitCount(Variable result, Value operand); public abstract void emitBitScanForward(Variable result, Value operand); public abstract void emitBitScanReverse(Variable result, Value operand); public abstract void emitByteSwap(Variable result, Value operand); public abstract void emitArrayEquals(Kind kind, Variable result, Value array1, Value array2, Value length); }