+++ /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.phpeclipse.internal.compiler.ast;
-
-import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
-import net.sourceforge.phpdt.internal.compiler.codegen.Label;
-import net.sourceforge.phpdt.internal.compiler.flow.ExceptionHandlingFlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.FinallyFlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
-import net.sourceforge.phpdt.internal.compiler.flow.InsideSubRoutineFlowContext;
-import net.sourceforge.phpdt.internal.compiler.flow.UnconditionalFlowInfo;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.MethodBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.MethodScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.ReferenceBinding;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-public class TryStatement extends Statement {
-
- public Block tryBlock;
- public Block[] catchBlocks;
- public Argument[] catchArguments;
- public Block finallyBlock;
- BlockScope scope;
-
- public boolean subRoutineCannotReturn = true;
- public UnconditionalFlowInfo subRoutineInits;
-
- // should rename into subRoutineComplete to be set to false by default
-
- ReferenceBinding[] caughtExceptionTypes;
- boolean tryBlockExit;
- boolean[] catchExits;
- public int[] preserveExceptionHandler;
-
- Label subRoutineStartLabel;
- public LocalVariableBinding anyExceptionVariable,
- returnAddressVariable,
- secretReturnValue;
-
- public final static char[] SecretReturnName = " returnAddress".toCharArray(); //$NON-NLS-1$
- public final static char[] SecretAnyHandlerName = " anyExceptionHandler".toCharArray(); //$NON-NLS-1$
- public static final char[] SecretLocalDeclarationName = " returnValue".toCharArray(); //$NON-NLS-1$
-
- // for local variables table attributes
- int preTryInitStateIndex = -1;
- int mergedInitStateIndex = -1;
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- // Consider the try block and catch block so as to compute the intersection of initializations and
- // the minimum exit relative depth amongst all of them. Then consider the subroutine, and append its
- // initialization to the try/catch ones, if the subroutine completes normally. If the subroutine does not
- // complete, then only keep this result for the rest of the analysis
-
- // process the finally block (subroutine) - create a context for the subroutine
-
- preTryInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
-
- if (anyExceptionVariable != null) {
- anyExceptionVariable.useFlag = LocalVariableBinding.USED;
- }
- if (returnAddressVariable != null) {
- returnAddressVariable.useFlag = LocalVariableBinding.USED;
- }
- InsideSubRoutineFlowContext insideSubContext;
- FinallyFlowContext finallyContext;
- UnconditionalFlowInfo subInfo;
- if (subRoutineStartLabel == null) {
- // no finally block
- insideSubContext = null;
- finallyContext = null;
- subInfo = null;
- } else {
- // analyse finally block first
- insideSubContext = new InsideSubRoutineFlowContext(flowContext, this);
- subInfo =
- finallyBlock
- .analyseCode(
- currentScope,
- finallyContext = new FinallyFlowContext(flowContext, finallyBlock),
- flowInfo.copy())
- .unconditionalInits();
- if (subInfo.isReachable()) {
- subRoutineCannotReturn = false;
- }
- this.subRoutineInits = subInfo;
- }
- // process the try block in a context handling the local exceptions.
- ExceptionHandlingFlowContext handlingContext =
- new ExceptionHandlingFlowContext(
- insideSubContext == null ? flowContext : insideSubContext,
- tryBlock,
- caughtExceptionTypes,
- scope,
- flowInfo.unconditionalInits());
-
- FlowInfo tryInfo;
- if (tryBlock.statements == null) {
- tryInfo = flowInfo;
- tryBlockExit = false;
- } else {
- tryInfo = tryBlock.analyseCode(currentScope, handlingContext, flowInfo.copy());
- tryBlockExit = !tryInfo.isReachable();
- }
-
- // check unreachable catch blocks
- handlingContext.complainIfUnusedExceptionHandlers(catchBlocks, scope, this);
-
- // process the catch blocks - computing the minimal exit depth amongst try/catch
- if (catchArguments != null) {
- int catchCount;
- catchExits = new boolean[catchCount = catchBlocks.length];
- for (int i = 0; i < catchCount; i++) {
- // keep track of the inits that could potentially have led to this exception handler (for final assignments diagnosis)
- FlowInfo catchInfo =
- flowInfo
- .copy()
- .unconditionalInits()
- .addPotentialInitializationsFrom(
- handlingContext.initsOnException(caughtExceptionTypes[i]).unconditionalInits())
- .addPotentialInitializationsFrom(tryInfo.unconditionalInits())
- .addPotentialInitializationsFrom(handlingContext.initsOnReturn);
-
- // catch var is always set
- catchInfo.markAsDefinitelyAssigned(catchArguments[i].binding);
- /*
- "If we are about to consider an unchecked exception handler, potential inits may have occured inside
- the try block that need to be detected , e.g.
- try { x = 1; throwSomething();} catch(Exception e){ x = 2} "
- "(uncheckedExceptionTypes notNil and: [uncheckedExceptionTypes at: index])
- ifTrue: [catchInits addPotentialInitializationsFrom: tryInits]."
- */
- // TODO: should only tag as unreachable if the catchblock cannot be reached
- //??? if (!handlingContext.initsOnException(caughtExceptionTypes[i]).isReachable()){
- if (tryBlock.statements == null) {
- catchInfo.setReachMode(FlowInfo.UNREACHABLE);
- }
- catchInfo =
- catchBlocks[i].analyseCode(
- currentScope,
- insideSubContext == null ? flowContext : insideSubContext,
- catchInfo);
- catchExits[i] = !catchInfo.isReachable();
- tryInfo = tryInfo.mergedWith(catchInfo.unconditionalInits());
- }
- }
- if (subRoutineStartLabel == null) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(tryInfo);
- return tryInfo;
- }
-
-
- // we also need to check potential multiple assignments of final variables inside the finally block
- // need to include potential inits from returns inside the try/catch parts - 1GK2AOF
- finallyContext.complainOnRedundantFinalAssignments(
- tryInfo.isReachable()
- ? (tryInfo.addPotentialInitializationsFrom(insideSubContext.initsOnReturn))
- : insideSubContext.initsOnReturn,
- currentScope);
- if (subInfo == FlowInfo.DEAD_END) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(subInfo);
- return subInfo;
- } else {
- FlowInfo mergedInfo = tryInfo.addInitializationsFrom(subInfo);
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- }
- }
-
- public boolean cannotReturn() {
-
- return subRoutineCannotReturn;
- }
-
- /**
- * Try statement code generation
- *
- */
-// public void generateCode(BlockScope currentScope, CodeStream codeStream) {
-//
-// if ((bits & IsReachableMASK) == 0) {
-// return;
-// }
-// if (tryBlock.isEmptyBlock()) {
-// if (subRoutineStartLabel != null) {
-// // since not passing the finallyScope, the block generation will exitUserScope(finallyScope)
-// finallyBlock.generateCode(scope, codeStream);
-// }
-// // May loose some local variable initializations : affecting the local variable attributes
-// if (mergedInitStateIndex != -1) {
-// codeStream.removeNotDefinitelyAssignedVariables(
-// currentScope,
-// mergedInitStateIndex);
-// }
-// // no local bytecode produced so no need for position remembering
-// return;
-// }
-// int pc = codeStream.position;
-// Label endLabel = new Label(codeStream);
-// boolean requiresNaturalJsr = false;
-//
-// // preparing exception labels
-// int maxCatches;
-// ExceptionLabel[] exceptionLabels =
-// new ExceptionLabel[maxCatches =
-// catchArguments == null ? 0 : catchArguments.length];
-// for (int i = 0; i < maxCatches; i++) {
-// boolean preserveCurrentHandler =
-// (preserveExceptionHandler[i
-// / ExceptionHandlingFlowContext.BitCacheSize]
-// & (1 << (i % ExceptionHandlingFlowContext.BitCacheSize)))
-// != 0;
-// if (preserveCurrentHandler) {
-// exceptionLabels[i] =
-// new ExceptionLabel(
-// codeStream,
-// (ReferenceBinding) catchArguments[i].binding.type);
-// }
-// }
-// ExceptionLabel anyExceptionLabel = null;
-// if (subRoutineStartLabel != null) {
-// subRoutineStartLabel.codeStream = codeStream;
-// anyExceptionLabel = new ExceptionLabel(codeStream, null);
-// }
-// // generate the try block
-// tryBlock.generateCode(scope, codeStream);
-// boolean tryBlockHasSomeCode = codeStream.position != pc;
-// // flag telling if some bytecodes were issued inside the try block
-//
-// // natural exit: only if necessary
-// boolean nonReturningSubRoutine =
-// (subRoutineStartLabel != null) && subRoutineCannotReturn;
-// if ((!tryBlockExit) && tryBlockHasSomeCode) {
-// int position = codeStream.position;
-// if (nonReturningSubRoutine) {
-// codeStream.goto_(subRoutineStartLabel);
-// } else {
-// requiresNaturalJsr = true;
-// codeStream.goto_(endLabel);
-// }
-// codeStream.updateLastRecordedEndPC(position);
-// //goto is tagged as part of the try block
-// }
-// // place end positions of user-defined exception labels
-// if (tryBlockHasSomeCode) {
-// for (int i = 0; i < maxCatches; i++) {
-// boolean preserveCurrentHandler =
-// (preserveExceptionHandler[i / ExceptionHandlingFlowContext.BitCacheSize]
-// & (1 << (i % ExceptionHandlingFlowContext.BitCacheSize)))
-// != 0;
-// if (preserveCurrentHandler) {
-// exceptionLabels[i].placeEnd();
-// }
-// }
-// /* generate sequence of handler, all starting by storing the TOS (exception
-// thrown) into their own catch variables, the one specified in the source
-// that must denote the handled exception.
-// */
-// if (catchArguments == null) {
-// if (anyExceptionLabel != null) {
-// anyExceptionLabel.placeEnd();
-// }
-// } else {
-// for (int i = 0; i < maxCatches; i++) {
-// boolean preserveCurrentHandler =
-// (preserveExceptionHandler[i / ExceptionHandlingFlowContext.BitCacheSize]
-// & (1 << (i % ExceptionHandlingFlowContext.BitCacheSize)))
-// != 0;
-// if (preserveCurrentHandler) {
-// // May loose some local variable initializations : affecting the local variable attributes
-// if (preTryInitStateIndex != -1) {
-// codeStream.removeNotDefinitelyAssignedVariables(
-// currentScope,
-// preTryInitStateIndex);
-// }
-// exceptionLabels[i].place();
-// codeStream.incrStackSize(1);
-// // optimizing the case where the exception variable is not actually used
-// LocalVariableBinding catchVar;
-// int varPC = codeStream.position;
-// if ((catchVar = catchArguments[i].binding).resolvedPosition != -1) {
-// codeStream.store(catchVar, false);
-// catchVar.recordInitializationStartPC(codeStream.position);
-// codeStream.addVisibleLocalVariable(catchVar);
-// } else {
-// codeStream.pop();
-// }
-// codeStream.recordPositionsFrom(varPC, catchArguments[i].sourceStart);
-// // Keep track of the pcs at diverging point for computing the local attribute
-// // since not passing the catchScope, the block generation will exitUserScope(catchScope)
-// catchBlocks[i].generateCode(scope, codeStream);
-// }
-// if (i == maxCatches - 1) {
-// if (anyExceptionLabel != null) {
-// anyExceptionLabel.placeEnd();
-// }
-// if (subRoutineStartLabel != null) {
-// if (!catchExits[i] && preserveCurrentHandler) {
-// requiresNaturalJsr = true;
-// codeStream.goto_(endLabel);
-// }
-// }
-// } else {
-// if (!catchExits[i] && preserveCurrentHandler) {
-// if (nonReturningSubRoutine) {
-// codeStream.goto_(subRoutineStartLabel);
-// } else {
-// requiresNaturalJsr = true;
-// codeStream.goto_(endLabel);
-// }
-// }
-// }
-// }
-// }
-// // addition of a special handler so as to ensure that any uncaught exception (or exception thrown
-// // inside catch blocks) will run the finally block
-// int finallySequenceStartPC = codeStream.position;
-// if (subRoutineStartLabel != null) {
-// // the additional handler is doing: jsr finallyBlock and rethrow TOS-exception
-// anyExceptionLabel.place();
-//
-// if (preTryInitStateIndex != -1) {
-// // reset initialization state, as for a normal catch block
-// codeStream.removeNotDefinitelyAssignedVariables(
-// currentScope,
-// preTryInitStateIndex);
-// }
-//
-// codeStream.incrStackSize(1);
-// if (nonReturningSubRoutine) {
-// codeStream.pop();
-// // "if subroutine cannot return, no need to jsr/jump to subroutine since it will be entered in sequence
-// } else {
-// codeStream.store(anyExceptionVariable, false);
-// codeStream.jsr(subRoutineStartLabel);
-// codeStream.load(anyExceptionVariable);
-// codeStream.athrow();
-// }
-// }
-// // end of catch sequence, place label that will correspond to the finally block beginning, or end of statement
-// endLabel.place();
-// if (subRoutineStartLabel != null) {
-// if (nonReturningSubRoutine) {
-// requiresNaturalJsr = false;
-// }
-// Label veryEndLabel = new Label(codeStream);
-// if (requiresNaturalJsr) {
-// codeStream.jsr(subRoutineStartLabel);
-// codeStream.goto_(veryEndLabel);
-// }
-// subRoutineStartLabel.place();
-// if (!nonReturningSubRoutine) {
-// codeStream.incrStackSize(1);
-// codeStream.store(returnAddressVariable, false);
-// }
-// codeStream.recordPositionsFrom(
-// finallySequenceStartPC,
-// finallyBlock.sourceStart);
-// // entire sequence for finally is associated to finally block
-// finallyBlock.generateCode(scope, codeStream);
-// if (!nonReturningSubRoutine) {
-// int position = codeStream.position;
-// codeStream.ret(returnAddressVariable.resolvedPosition);
-// codeStream.updateLastRecordedEndPC(position);
-// // the ret bytecode is part of the subroutine
-// }
-// if (requiresNaturalJsr) {
-// veryEndLabel.place();
-// }
-// }
-// } else {
-// // try block had no effect, only generate the body of the finally block if any
-// if (subRoutineStartLabel != null) {
-// finallyBlock.generateCode(scope, codeStream);
-// }
-// }
-// // May loose some local variable initializations : affecting the local variable attributes
-// if (mergedInitStateIndex != -1) {
-// codeStream.removeNotDefinitelyAssignedVariables(
-// currentScope,
-// mergedInitStateIndex);
-// codeStream.addDefinitelyAssignedVariables(currentScope, mergedInitStateIndex);
-// }
-// codeStream.recordPositionsFrom(pc, this.sourceStart);
-// }
-
- public void resetStateForCodeGeneration() {
- if (this.subRoutineStartLabel != null) {
- this.subRoutineStartLabel.resetStateForCodeGeneration();
- }
- }
-
- public void resolve(BlockScope upperScope) {
-
- // special scope for secret locals optimization.
- this.scope = new BlockScope(upperScope);
-
- BlockScope tryScope = new BlockScope(scope);
- BlockScope finallyScope = null;
-
- if (finallyBlock != null
- && finallyBlock.statements != null) {
-
- finallyScope = new BlockScope(scope, false); // don't add it yet to parent scope
-
- // provision for returning and forcing the finally block to run
- MethodScope methodScope = scope.methodScope();
-
- // the type does not matter as long as it is not a base type
- this.returnAddressVariable =
- new LocalVariableBinding(SecretReturnName, upperScope.getJavaLangObject(), AccDefault, false);
- finallyScope.addLocalVariable(returnAddressVariable);
- this.returnAddressVariable.constant = NotAConstant; // not inlinable
- this.subRoutineStartLabel = new Label();
-
- this.anyExceptionVariable =
- new LocalVariableBinding(SecretAnyHandlerName, scope.getJavaLangThrowable(), AccDefault, false);
- finallyScope.addLocalVariable(this.anyExceptionVariable);
- this.anyExceptionVariable.constant = NotAConstant; // not inlinable
-
- if (!methodScope.isInsideInitializer()) {
- MethodBinding methodBinding =
- ((AbstractMethodDeclaration) methodScope.referenceContext).binding;
- if (methodBinding != null) {
- TypeBinding methodReturnType = methodBinding.returnType;
- if (methodReturnType.id != T_void) {
- this.secretReturnValue =
- new LocalVariableBinding(
- SecretLocalDeclarationName,
- methodReturnType,
- AccDefault,
- false);
- finallyScope.addLocalVariable(this.secretReturnValue);
- this.secretReturnValue.constant = NotAConstant; // not inlinable
- }
- }
- }
- finallyBlock.resolveUsing(finallyScope);
- // force the finally scope to have variable positions shifted after its try scope and catch ones
- finallyScope.shiftScopes = new BlockScope[catchArguments == null ? 1 : catchArguments.length+1];
- finallyScope.shiftScopes[0] = tryScope;
- }
- this.tryBlock.resolveUsing(tryScope);
-
- // arguments type are checked against JavaLangThrowable in resolveForCatch(..)
- if (this.catchBlocks != null) {
- int length = this.catchArguments.length;
- TypeBinding[] argumentTypes = new TypeBinding[length];
- for (int i = 0; i < length; i++) {
- BlockScope catchScope = new BlockScope(scope);
- if (finallyScope != null){
- finallyScope.shiftScopes[i+1] = catchScope;
- }
- // side effect on catchScope in resolveForCatch(..)
- if ((argumentTypes[i] = catchArguments[i].resolveForCatch(catchScope)) == null)
- return;
- catchBlocks[i].resolveUsing(catchScope);
- }
-
- // Verify that the catch clause are ordered in the right way:
- // more specialized first.
- this.caughtExceptionTypes = new ReferenceBinding[length];
- for (int i = 0; i < length; i++) {
- caughtExceptionTypes[i] = (ReferenceBinding) argumentTypes[i];
- for (int j = 0; j < i; j++) {
- if (caughtExceptionTypes[i].isCompatibleWith(argumentTypes[j])) {
- scope.problemReporter().wrongSequenceOfExceptionTypesError(this, i, j);
- // cannot return - since may still proceed if unreachable code is ignored (21203)
- }
- }
- }
- } else {
- caughtExceptionTypes = new ReferenceBinding[0];
- }
-
- if (finallyScope != null){
- // add finallyScope as last subscope, so it can be shifted behind try/catch subscopes.
- // the shifting is necessary to achieve no overlay in between the finally scope and its
- // sibling in term of local variable positions.
- this.scope.addSubscope(finallyScope);
- }
- }
-
- public String toString(int tab) {
- String s = tabString(tab);
- //try
- s = s + "try "; //$NON-NLS-1$
- if (tryBlock == Block.None)
- s = s + "{}"; //$NON-NLS-1$
- else
- s = s + "\n" + tryBlock.toString(tab + 1); //$NON-NLS-1$
-
- //catches
- if (catchBlocks != null)
- for (int i = 0; i < catchBlocks.length; i++)
- s = s + "\n" + tabString(tab) + "catch (" //$NON-NLS-2$ //$NON-NLS-1$
- +catchArguments[i].toString(0) + ") " //$NON-NLS-1$
- +catchBlocks[i].toString(tab + 1);
- //finally
- if (finallyBlock != null) {
- if (finallyBlock == Block.None)
- s = s + "\n" + tabString(tab) + "finally {}"; //$NON-NLS-2$ //$NON-NLS-1$
- else
- s = s + "\n" + tabString(tab) + "finally\n" + //$NON-NLS-2$ //$NON-NLS-1$
- finallyBlock.toString(tab + 1);
- }
-
- return s;
- }
-
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
-
- if (visitor.visit(this, blockScope)) {
- tryBlock.traverse(visitor, scope);
- if (catchArguments != null) {
- for (int i = 0, max = catchBlocks.length; i < max; i++) {
- catchArguments[i].traverse(visitor, scope);
- catchBlocks[i].traverse(visitor, scope);
- }
- }
- if (finallyBlock != null)
- finallyBlock.traverse(visitor, scope);
- }
- visitor.endVisit(this, blockScope);
- }
-}
git://git.phpeclipse.com / phpeclipse.git / blobdiff