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comparison graal/GraalCompiler/src/com/sun/c1x/value/MutableFrameState.java @ 2610:39aa89baa165

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cleanup: FrameState copy methods, ImmutableFrameState
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 06 May 2011 13:03:33 +0200
parents cc1f1d396288
children
comparison
equal deleted inserted replaced
2603:01c5c0443158 2610:39aa89baa165
37 * {@link FrameState}s must not be cast to {@code MutableFrameState}s. Instead, a new copy must be created using 37 * {@link FrameState}s must not be cast to {@code MutableFrameState}s. Instead, a new copy must be created using
38 * {@link FrameState#copy()}. 38 * {@link FrameState#copy()}.
39 * Contrariwise and as an optimization, an instance referenced as {@code MutableFrameState} can be assigned to 39 * Contrariwise and as an optimization, an instance referenced as {@code MutableFrameState} can be assigned to
40 * a variable, field, or method parameter of type {@link FrameState} without creating an immutable copy before 40 * a variable, field, or method parameter of type {@link FrameState} without creating an immutable copy before
41 * (using {@link #immutableCopy(int)}) if the state is not mutated after the assignment. 41 * (using {@link #immutableCopy(int)}) if the state is not mutated after the assignment.
42 *
43 * @author Michael Duller
44 */ 42 */
45 public final class MutableFrameState extends FrameState { 43 public final class MutableFrameState extends FrameState {
46 44
47 public MutableFrameState(int bci, int maxLocals, int maxStack) { 45 public MutableFrameState(int bci, int maxLocals, int maxStack) {
48 super(bci, maxLocals, maxStack); 46 super(bci, maxLocals, maxStack);
49 }
50
51 /**
52 * Replace the local variables in this frame state with the local variables from the specified frame state. This is
53 * used in inlining.
54 *
55 * @param with the frame state containing the new local variables
56 */
57 public void replaceLocals(FrameState with) {
58 assert with.maxLocals == maxLocals;
59 System.arraycopy(with.values, 0, values, 0, maxLocals);
60 }
61
62 /**
63 * Replace the stack in this frame state with the stack from the specified frame state. This is used in inlining.
64 *
65 * @param with the frame state containing the new local variables
66 */
67 public void replaceStack(FrameState with) {
68 System.arraycopy(with.values, with.maxLocals, values, maxLocals, with.stackIndex);
69 stackIndex = with.stackIndex;
70 assert stackIndex >= 0;
71 }
72
73 /**
74 * Replace the locks in this frame state with the locks from the specified frame state. This is used in inlining.
75 *
76 * @param with the frame state containing the new local variables
77 */
78 public void replaceLocks(FrameState with) {
79 if (with.locks == null) {
80 locks = null;
81 } else {
82 locks = Util.uncheckedCast(with.locks.clone());
83 }
84 } 47 }
85 48
86 /** 49 /**
87 * Clears all values on this stack. 50 * Clears all values on this stack.
88 */ 51 */
347 /** 310 /**
348 * Gets an immutable copy of this state. 311 * Gets an immutable copy of this state.
349 * @param bci the bytecode index of the new frame state 312 * @param bci the bytecode index of the new frame state
350 */ 313 */
351 public FrameState immutableCopy(int bci) { 314 public FrameState immutableCopy(int bci) {
352 return copy(bci, true, true, true); 315 return immutableCopy(bci, true, true, true);
353 } 316 }
354 317
355 private static void assertHigh(Value x) { 318 private static void assertHigh(Value x) {
356 assert x == null; 319 assert x == null;
357 } 320 }