Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/value/MutableFrameState.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/value/MutableFrameState.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,366 @@ +/* + * Copyright (c) 2010, 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.value; + +import java.util.*; + +import com.sun.c1x.*; +import com.sun.c1x.ir.*; +import com.sun.c1x.util.*; +import com.sun.cri.ci.*; + + +/** + * The {@code MutableFrameState} class extends abstract {@link FrameState} with methods modifying the frame state. + * Only {@code MutableFrameState} can be instantiated and thus the object references in which it is stored decide + * whether it is used as immutable or not. Thus and because they can be shared at different places in the compiler, + * {@link FrameState}s must not be cast to {@code MutableFrameState}s. Instead, a new copy must be created using + * {@link FrameState#copy()}. + * Contrariwise and as an optimization, an instance referenced as {@code MutableFrameState} can be assigned to + * a variable, field, or method parameter of type {@link FrameState} without creating an immutable copy before + * (using {@link #immutableCopy(int)}) if the state is not mutated after the assignment. + * + * @author Michael Duller + */ +public final class MutableFrameState extends FrameState { + + public MutableFrameState(IRScope irScope, int bci, int maxLocals, int maxStack) { + super(irScope, bci, maxLocals, maxStack); + } + + /** + * Replace the local variables in this frame state with the local variables from the specified frame state. This is + * used in inlining. + * + * @param with the frame state containing the new local variables + */ + public void replaceLocals(FrameState with) { + assert with.maxLocals == maxLocals; + System.arraycopy(with.values, 0, values, 0, maxLocals); + } + + /** + * Replace the stack in this frame state with the stack from the specified frame state. This is used in inlining. + * + * @param with the frame state containing the new local variables + */ + public void replaceStack(FrameState with) { + System.arraycopy(with.values, with.maxLocals, values, maxLocals, with.stackIndex); + stackIndex = with.stackIndex; + assert stackIndex >= 0; + } + + /** + * Replace the locks in this frame state with the locks from the specified frame state. This is used in inlining. + * + * @param with the frame state containing the new local variables + */ + public void replaceLocks(FrameState with) { + if (with.locks == null) { + locks = null; + } else { + locks = Util.uncheckedCast(with.locks.clone()); + } + } + + /** + * Clears all values on this stack. + */ + public void clearStack() { + stackIndex = 0; + } + + public void clearLocals() { + for (int i = 0; i < maxLocals; i++) { + values[i] = null; + } + } + + /** + * Truncates this stack to the specified size. + * @param size the size to truncate to + */ + public void truncateStack(int size) { + stackIndex = size; + assert stackIndex >= 0; + } + + /** + * Pushes an instruction onto the stack with the expected type. + * @param kind the type expected for this instruction + * @param x the instruction to push onto the stack + */ + public void push(CiKind kind, Value x) { + assert kind != CiKind.Void; + xpush(assertKind(kind, x)); + if (kind.sizeInSlots() == 2) { + xpush(null); + } + } + + /** + * Pushes a value onto the stack without checking the type. + * @param x the instruction to push onto the stack + */ + public void xpush(Value x) { + assert stackIndex >= 0; + assert maxLocals + stackIndex < values.length; + values[maxLocals + stackIndex++] = x; + } + + /** + * Pushes a value onto the stack and checks that it is an int. + * @param x the instruction to push onto the stack + */ + public void ipush(Value x) { + xpush(assertInt(x)); + } + + /** + * Pushes a value onto the stack and checks that it is a float. + * @param x the instruction to push onto the stack + */ + public void fpush(Value x) { + xpush(assertFloat(x)); + } + + /** + * Pushes a value onto the stack and checks that it is an object. + * @param x the instruction to push onto the stack + */ + public void apush(Value x) { + xpush(assertObject(x)); + } + + /** + * Pushes a value onto the stack and checks that it is a word. + * @param x the instruction to push onto the stack + */ + public void wpush(Value x) { + xpush(assertWord(x)); + } + + /** + * Pushes a value onto the stack and checks that it is a JSR return address. + * @param x the instruction to push onto the stack + */ + public void jpush(Value x) { + xpush(assertJsr(x)); + } + + /** + * Pushes a value onto the stack and checks that it is a long. + * + * @param x the instruction to push onto the stack + */ + public void lpush(Value x) { + xpush(assertLong(x)); + xpush(null); + } + + /** + * Pushes a value onto the stack and checks that it is a double. + * @param x the instruction to push onto the stack + */ + public void dpush(Value x) { + xpush(assertDouble(x)); + xpush(null); + } + + /** + * Pops an instruction off the stack with the expected type. + * @param kind the expected type + * @return the instruction on the top of the stack + */ + public Value pop(CiKind kind) { + if (kind.sizeInSlots() == 2) { + xpop(); + } + return assertKind(kind, xpop()); + } + + /** + * Pops a value off of the stack without checking the type. + * @return x the instruction popped off the stack + */ + public Value xpop() { + assert stackIndex >= 1; + return values[maxLocals + --stackIndex]; + } + + /** + * Pops a value off of the stack and checks that it is an int. + * @return x the instruction popped off the stack + */ + public Value ipop() { + return assertInt(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is a float. + * @return x the instruction popped off the stack + */ + public Value fpop() { + return assertFloat(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is an object. + * @return x the instruction popped off the stack + */ + public Value apop() { + return assertObject(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is a word. + * @return x the instruction popped off the stack + */ + public Value wpop() { + return assertWord(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is a JSR return address. + * @return x the instruction popped off the stack + */ + public Value jpop() { + return assertJsr(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is a long. + * @return x the instruction popped off the stack + */ + public Value lpop() { + assertHigh(xpop()); + return assertLong(xpop()); + } + + /** + * Pops a value off of the stack and checks that it is a double. + * @return x the instruction popped off the stack + */ + public Value dpop() { + assertHigh(xpop()); + return assertDouble(xpop()); + } + + private static Value assertKind(CiKind kind, Value x) { + assert x != null && (x.kind == kind || !isTypesafe()) : "kind=" + kind + ", value=" + x + ((x == null) ? "" : ", value.kind=" + x.kind); + return x; + } + + private static Value assertLong(Value x) { + assert x != null && (x.kind == CiKind.Long || !isTypesafe()); + return x; + } + + private static Value assertJsr(Value x) { + assert x != null && (x.kind == CiKind.Jsr || !isTypesafe()); + return x; + } + + private static Value assertInt(Value x) { + assert x != null && (x.kind == CiKind.Int || !isTypesafe()); + return x; + } + + private static Value assertFloat(Value x) { + assert x != null && (x.kind == CiKind.Float || !isTypesafe()); + return x; + } + + private static Value assertObject(Value x) { + assert x != null && (x.kind == CiKind.Object || !isTypesafe()); + return x; + } + + private static Value assertWord(Value x) { + assert x != null && (x.kind == CiKind.Word || !isTypesafe()); + return x; + } + + private static Value assertDouble(Value x) { + assert x != null && (x.kind == CiKind.Double || !isTypesafe()); + return x; + } + + /** + * Pop the specified number of slots off of this stack and return them as an array of instructions. + * @param size the number of arguments off of the stack + * @return an array containing the arguments off of the stack + */ + public Value[] popArguments(int size) { + int base = stackIndex - size; + Value[] r = new Value[size]; + int y = maxLocals + base; + for (int i = 0; i < size; ++i) { + assert values[y] != null || values[y - 1].kind.jvmSlots == 2; + r[i] = values[y++]; + } + stackIndex = base; + assert stackIndex >= 0; + return r; + } + + /** + * Locks a new object within the specified IRScope. + * @param scope the IRScope in which this locking operation occurs + * @param obj the object being locked + */ + public void lock(IRScope scope, Value obj, int totalNumberOfLocks) { + if (locks == null) { + locks = new ArrayList<Value>(4); + } + locks.add(obj); + scope.updateMaxLocks(totalNumberOfLocks); + } + + /** + * Unlock the lock on the top of the stack. + */ + public void unlock() { + locks.remove(locks.size() - 1); + } + + /** + * Gets an immutable copy of this state. + * @param bci the bytecode index of the new frame state + */ + public FrameState immutableCopy(int bci) { + return copy(bci, true, true, true); + } + + /** + * Determines if the current compilation is typesafe. + */ + private static boolean isTypesafe() { + return C1XCompilation.compilation().isTypesafe(); + } + + private static void assertHigh(Value x) { + assert x == null; + } + +}