--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package net.sourceforge.phpdt.internal.compiler.codegen;
+
+import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
+import net.sourceforge.phpdt.internal.compiler.problem.AbortMethod;
+
+/**
+ * This type is a port of smalltalks JavaLabel
+ */
+public class Label {
+// public CodeStream codeStream;
+ final static int POS_NOT_SET = -1;
+ public int position = POS_NOT_SET; // position=POS_NOT_SET Then it's pos is not set.
+ public int[] forwardReferences = new int[10]; // Add an overflow check here.
+ public int forwardReferenceCount = 0;
+ private boolean isWide = false;
+public Label() {
+}
+/**
+ * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
+ */
+//public Label(CodeStream codeStream) {
+// this.codeStream = codeStream;
+//}
+/**
+ * Add a forward refrence for the array.
+ */
+void addForwardReference(int iPos) {
+ int length;
+ if (forwardReferenceCount >= (length = forwardReferences.length))
+ System.arraycopy(forwardReferences, 0, (forwardReferences = new int[2*length]), 0, length);
+ forwardReferences[forwardReferenceCount++] = iPos;
+}
+/**
+ * Add a forward refrence for the array.
+ */
+public void appendForwardReferencesFrom(Label otherLabel) {
+ int otherCount = otherLabel.forwardReferenceCount;
+ if (otherCount == 0) return;
+ int length = forwardReferences.length;
+ int neededSpace = otherCount + forwardReferenceCount;
+ if (neededSpace >= length){
+ System.arraycopy(forwardReferences, 0, (forwardReferences = new int[neededSpace]), 0, forwardReferenceCount);
+ }
+ // append other forward references at the end, so they will get updated as well
+ System.arraycopy(otherLabel.forwardReferences, 0, forwardReferences, forwardReferenceCount, otherCount);
+ forwardReferenceCount = neededSpace;
+}
+/*
+* Put down a refernece to the array at the location in the codestream.
+*/
+//void branch() {
+// if (position == POS_NOT_SET) {
+// addForwardReference(codeStream.position);
+// // Leave two bytes free to generate the jump afterwards
+// codeStream.position += 2;
+// codeStream.classFileOffset += 2;
+// } else {
+// /*
+// * Position is set. Write it if it is not a wide branch.
+// */
+// int offset = position - codeStream.position + 1;
+// if (Math.abs(offset) > 0x7FFF && !this.codeStream.wideMode) {
+// throw new AbortMethod(CodeStream.RESTART_IN_WIDE_MODE);
+// }
+// codeStream.writeSignedShort((short) offset);
+// }
+//}
+/*
+* No support for wide branches yet
+*/
+//void branchWide() {
+// if (position == POS_NOT_SET) {
+// addForwardReference(codeStream.position);
+// // Leave 4 bytes free to generate the jump offset afterwards
+// isWide = true;
+// codeStream.position += 4;
+// codeStream.classFileOffset += 4;
+// } else { //Position is set. Write it!
+// codeStream.writeSignedWord(position - codeStream.position + 1);
+// }
+//}
+/**
+ * @return boolean
+ */
+public boolean hasForwardReferences() {
+ return forwardReferenceCount != 0;
+}
+/*
+ * Some placed labels might be branching to a goto bytecode which we can optimize better.
+ */
+//public void inlineForwardReferencesFromLabelsTargeting(int gotoLocation) {
+///*
+// Code required to optimized unreachable gotos.
+// public boolean isBranchTarget(int location) {
+// Label[] labels = codeStream.labels;
+// for (int i = codeStream.countLabels - 1; i >= 0; i--){
+// Label label = labels[i];
+// if ((label.position == location) && label.isStandardLabel()){
+// return true;
+// }
+// }
+// return false;
+// }
+// */
+//
+// Label[] labels = codeStream.labels;
+// for (int i = codeStream.countLabels - 1; i >= 0; i--){
+// Label label = labels[i];
+// if ((label.position == gotoLocation) && label.isStandardLabel()){
+// this.appendForwardReferencesFrom(label);
+// /*
+// Code required to optimized unreachable gotos.
+// label.position = POS_NOT_SET;
+// */
+// } else {
+// break; // same target labels should be contiguous
+// }
+// }
+//}
+public boolean isStandardLabel(){
+ return true;
+}
+/*
+* Place the label. If we have forward references resolve them.
+*/
+//public void place() { // Currently lacking wide support.
+// if (position == POS_NOT_SET) {
+// position = codeStream.position;
+// codeStream.addLabel(this);
+// int oldPosition = position;
+// boolean optimizedBranch = false;
+// // TURNED OFF since fail on 1F4IRD9
+// if (forwardReferenceCount != 0) {
+// if (optimizedBranch = (forwardReferences[forwardReferenceCount - 1] + 2 == position) && (codeStream.bCodeStream[codeStream.classFileOffset - 3] == CodeStream.OPC_goto)) {
+// codeStream.position = (position -= 3);
+// codeStream.classFileOffset -= 3;
+// forwardReferenceCount--;
+// // also update the PCs in the related debug attributes
+// /** OLD CODE
+// int index = codeStream.pcToSourceMapSize - 1;
+// while ((index >= 0) && (codeStream.pcToSourceMap[index][1] == oldPosition)) {
+// codeStream.pcToSourceMap[index--][1] = position;
+// }
+// */
+// // Beginning of new code
+// int index = codeStream.pcToSourceMapSize - 2;
+// if (codeStream.lastEntryPC == oldPosition) {
+// codeStream.lastEntryPC = position;
+// }
+// if ((index >= 0) && (codeStream.pcToSourceMap[index] == position)) {
+// codeStream.pcToSourceMapSize-=2;
+// }
+// // end of new code
+// if (codeStream.generateLocalVariableTableAttributes) {
+// LocalVariableBinding locals[] = codeStream.locals;
+// for (int i = 0, max = locals.length; i < max; i++) {
+// LocalVariableBinding local = locals[i];
+// if ((local != null) && (local.initializationCount > 0)) {
+// if (local.initializationPCs[((local.initializationCount - 1) << 1) + 1] == oldPosition) {
+// // we want to prevent interval of size 0 to have a negative size.
+// // see PR 1GIRQLA: ITPJCORE:ALL - ClassFormatError for local variable attribute
+// local.initializationPCs[((local.initializationCount - 1) << 1) + 1] = position;
+// }
+// if (local.initializationPCs[(local.initializationCount - 1) << 1] == oldPosition) {
+// local.initializationPCs[(local.initializationCount - 1) << 1] = position;
+// }
+// }
+// }
+// }
+// }
+// }
+// for (int i = 0; i < forwardReferenceCount; i++) {
+// int offset = position - forwardReferences[i] + 1;
+// if (Math.abs(offset) > 0x7FFF && !this.codeStream.wideMode) {
+// throw new AbortMethod(CodeStream.RESTART_IN_WIDE_MODE);
+// }
+// if (this.codeStream.wideMode) {
+// if (this.isWide) {
+// codeStream.writeSignedWord(forwardReferences[i], offset);
+// } else {
+// codeStream.writeSignedShort(forwardReferences[i], (short) offset);
+// }
+// } else {
+// codeStream.writeSignedShort(forwardReferences[i], (short) offset);
+// }
+// }
+// // For all labels placed at that position we check if we need to rewrite the jump
+// // offset. It is the case each time a label had a forward reference to the current position.
+// // Like we change the current position, we have to change the jump offset. See 1F4IRD9 for more details.
+// if (optimizedBranch) {
+// for (int i = 0; i < codeStream.countLabels; i++) {
+// Label label = codeStream.labels[i];
+// if (oldPosition == label.position) {
+// label.position = position;
+// if (label instanceof CaseLabel) {
+// int offset = position - ((CaseLabel) label).instructionPosition;
+// for (int j = 0; j < label.forwardReferenceCount; j++) {
+// int forwardPosition = label.forwardReferences[j];
+// codeStream.writeSignedWord(forwardPosition, offset);
+// }
+// } else {
+// for (int j = 0; j < label.forwardReferenceCount; j++) {
+// int forwardPosition = label.forwardReferences[j];
+// int offset = position - forwardPosition + 1;
+// if (Math.abs(offset) > 0x7FFF && !this.codeStream.wideMode) {
+// throw new AbortMethod(CodeStream.RESTART_IN_WIDE_MODE);
+// }
+// if (this.codeStream.wideMode) {
+// if (this.isWide) {
+// codeStream.writeSignedWord(forwardPosition, offset);
+// } else {
+// codeStream.writeSignedShort(forwardPosition, (short) offset);
+// }
+// } else {
+// codeStream.writeSignedShort(forwardPosition, (short) offset);
+// }
+// }
+// }
+// }
+// }
+// }
+// }
+//}
+/**
+ * Print out the receiver
+ */
+public String toString() {
+ StringBuffer buffer = new StringBuffer("(position="); //$NON-NLS-1$
+ buffer.append(position);
+ buffer.append(", forwards = ["); //$NON-NLS-1$
+ for (int i = 0; i < forwardReferenceCount - 1; i++)
+ buffer.append(forwardReferences[i] + ", "); //$NON-NLS-1$
+ if (forwardReferenceCount >= 1)
+ buffer.append(forwardReferences[forwardReferenceCount-1]);
+ buffer.append("] )"); //$NON-NLS-1$
+ return buffer.toString();
+}
+
+public void resetStateForCodeGeneration() {
+ this.position = POS_NOT_SET;
+ this.forwardReferenceCount = 0;
+}
+}
git://git.phpeclipse.com / phpeclipse.git / blobdiff