/** Code generation for a array allocation expression */
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (initializer != null) {
initializer.generateCode(currentScope, codeStream, valueRequired);
return;
}
int nonNullDimensionsLength = 0;
for (int i = 0, max = dimensions.length; i < max; i++)
if (dimensions[i] != null) {
dimensions[i].generateCode(currentScope, codeStream, true);
nonNullDimensionsLength++;
}
// Generate a sequence of bytecodes corresponding to an array allocation
if (this.resolvedType.dimensions() == 1) {
// Mono-dimensional array
codeStream.newArray((ArrayBinding) this.resolvedType);
} else {
// Multi-dimensional array
codeStream.multianewarray(this.resolvedType, nonNullDimensionsLength);
}
if (valueRequired) {
codeStream.generateImplicitConversion(implicitConversion);
} else {
codeStream.pop();
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* Code generation for instanceOfExpression
*
* @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
* @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
* @param valueRequired boolean
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
this.expression.generateCode(currentScope, codeStream, true);
codeStream.instance_of(this.type.resolvedType);
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
codeStream.pop();
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* MessageSendDotClass code generation
*
* @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
* @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
* @param valueRequired boolean
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
// {ObjectTeams: role class literal?
if (this.roleClassLiteralAccess != null) {
this.roleClassLiteralAccess.generateCode(currentScope, codeStream, valueRequired);
return;
}
// SH}
int pc = codeStream.position;
// in interface case, no caching occurs, since cannot make a cache field for interface
if (valueRequired) {
codeStream.generateClassLiteralAccessForType(this.type.resolvedType, this.syntheticField);
codeStream.generateImplicitConversion(this.implicitConversion);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
if ((this.bits & IsReachable) == 0) {
return;
}
int pc = codeStream.position;
if (this.assertionSyntheticFieldBinding != null) {
BranchLabel assertionActivationLabel = new BranchLabel(codeStream);
codeStream.fieldAccess(
Opcodes.OPC_getstatic,
this.assertionSyntheticFieldBinding,
null /* default declaringClass */);
codeStream.ifne(assertionActivationLabel);
BranchLabel falseLabel;
this.assertExpression.generateOptimizedBoolean(
currentScope, codeStream, (falseLabel = new BranchLabel(codeStream)), null, true);
codeStream.newJavaLangAssertionError();
codeStream.dup();
if (this.exceptionArgument != null) {
this.exceptionArgument.generateCode(currentScope, codeStream, true);
codeStream.invokeJavaLangAssertionErrorConstructor(
this.exceptionArgument.implicitConversion & 0xF);
} else {
codeStream.invokeJavaLangAssertionErrorDefaultConstructor();
}
codeStream.athrow();
// May loose some local variable initializations : affecting the local variable attributes
if (this.preAssertInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.preAssertInitStateIndex);
}
falseLabel.place();
assertionActivationLabel.place();
} else {
// May loose some local variable initializations : affecting the local variable attributes
if (this.preAssertInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.preAssertInitStateIndex);
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* Try statement code generation with or without jsr bytecode use post 1.5 target level, cannot
* use jsr bytecode, must instead inline finally block returnAddress is only allocated if jsr is
* allowed
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
if ((bits & IsReachableMASK) == 0) {
return;
}
// in case the labels needs to be reinitialized
// when the code generation is restarted in wide mode
if (this.anyExceptionLabelsCount > 0) {
this.anyExceptionLabels = NO_EXCEPTION_HANDLER;
this.anyExceptionLabelsCount = 0;
}
int pc = codeStream.position;
final int NO_FINALLY = 0; // no finally block
final int FINALLY_SUBROUTINE =
1; // finally is generated as a subroutine (using jsr/ret bytecodes)
final int FINALLY_DOES_NOT_COMPLETE =
2; // non returning finally is optimized with only one instance of finally block
final int FINALLY_MUST_BE_INLINED =
3; // finally block must be inlined since cannot use jsr/ret bytecodes >1.5
int finallyMode;
if (subRoutineStartLabel == null) {
finallyMode = NO_FINALLY;
} else {
if (this.isSubRoutineEscaping) {
finallyMode = FINALLY_DOES_NOT_COMPLETE;
} else if (scope.compilerOptions().inlineJsrBytecode) {
finallyMode = FINALLY_MUST_BE_INLINED;
} else {
finallyMode = FINALLY_SUBROUTINE;
}
}
boolean requiresNaturalExit = false;
// preparing exception labels
int maxCatches;
ExceptionLabel[] exceptionLabels =
new ExceptionLabel[maxCatches = catchArguments == null ? 0 : catchArguments.length];
for (int i = 0; i < maxCatches; i++) {
exceptionLabels[i] = new ExceptionLabel(codeStream, catchArguments[i].binding.type);
}
if (subRoutineStartLabel != null) {
subRoutineStartLabel.initialize(codeStream);
this.enterAnyExceptionHandler(codeStream);
}
// generate the try block
tryBlock.generateCode(scope, codeStream);
boolean tryBlockHasSomeCode = codeStream.position != pc;
// flag telling if some bytecodes were issued inside the try block
// place end positions of user-defined exception labels
if (tryBlockHasSomeCode) {
// natural exit may require subroutine invocation (if finally != null)
Label naturalExitLabel = new Label(codeStream);
if (!tryBlockExit) {
int position = codeStream.position;
switch (finallyMode) {
case FINALLY_SUBROUTINE:
case FINALLY_MUST_BE_INLINED:
requiresNaturalExit = true;
// fall through
case NO_FINALLY:
codeStream.goto_(naturalExitLabel);
break;
case FINALLY_DOES_NOT_COMPLETE:
codeStream.goto_(subRoutineStartLabel);
break;
}
codeStream.updateLastRecordedEndPC(tryBlock.scope, position);
// goto is tagged as part of the try block
}
for (int i = 0; i < maxCatches; i++) {
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) {
for (int i = 0; i < maxCatches; i++) {
// 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 (!catchExits[i]) {
switch (finallyMode) {
case FINALLY_SUBROUTINE:
case FINALLY_MUST_BE_INLINED:
requiresNaturalExit = true;
// fall through
case NO_FINALLY:
codeStream.goto_(naturalExitLabel);
break;
case FINALLY_DOES_NOT_COMPLETE:
codeStream.goto_(subRoutineStartLabel);
break;
}
}
}
}
this.exitAnyExceptionHandler();
// extra handler for trailing natural exit (will be fixed up later on when natural exit is
// generated below)
ExceptionLabel naturalExitExceptionHandler =
finallyMode == FINALLY_SUBROUTINE && requiresNaturalExit
? new ExceptionLabel(codeStream, null)
: null;
// 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) {
this.placeAllAnyExceptionHandlers();
if (naturalExitExceptionHandler != null) naturalExitExceptionHandler.place();
if (preTryInitStateIndex != -1) {
// reset initialization state, as for a normal catch block
codeStream.removeNotDefinitelyAssignedVariables(currentScope, preTryInitStateIndex);
}
codeStream.incrStackSize(1);
switch (finallyMode) {
case FINALLY_SUBROUTINE:
codeStream.store(anyExceptionVariable, false);
codeStream.jsr(subRoutineStartLabel);
codeStream.recordPositionsFrom(finallySequenceStartPC, finallyBlock.sourceStart);
int position = codeStream.position;
codeStream.load(anyExceptionVariable);
codeStream.athrow();
codeStream.recordPositionsFrom(position, finallyBlock.sourceEnd);
subRoutineStartLabel.place();
codeStream.incrStackSize(1);
position = codeStream.position;
codeStream.store(returnAddressVariable, false);
codeStream.recordPositionsFrom(position, finallyBlock.sourceStart);
finallyBlock.generateCode(scope, codeStream);
position = codeStream.position;
codeStream.ret(returnAddressVariable.resolvedPosition);
// codeStream.updateLastRecordedEndPC(position);
codeStream.recordPositionsFrom(position, finallyBlock.sourceEnd);
// the ret bytecode is part of the subroutine
break;
case FINALLY_MUST_BE_INLINED:
codeStream.store(anyExceptionVariable, false);
codeStream.recordPositionsFrom(finallySequenceStartPC, finallyBlock.sourceStart);
this.finallyBlock.generateCode(currentScope, codeStream);
position = codeStream.position;
codeStream.load(anyExceptionVariable);
codeStream.athrow();
subRoutineStartLabel.place();
codeStream.recordPositionsFrom(position, finallyBlock.sourceEnd);
break;
case FINALLY_DOES_NOT_COMPLETE:
codeStream.pop();
subRoutineStartLabel.place();
codeStream.recordPositionsFrom(finallySequenceStartPC, finallyBlock.sourceStart);
finallyBlock.generateCode(scope, codeStream);
break;
}
// will naturally fall into subsequent code after subroutine invocation
naturalExitLabel.place();
if (requiresNaturalExit) {
switch (finallyMode) {
case FINALLY_SUBROUTINE:
int position = codeStream.position;
// fix up natural exit handler
naturalExitExceptionHandler.placeStart();
codeStream.jsr(subRoutineStartLabel);
naturalExitExceptionHandler.placeEnd();
codeStream.recordPositionsFrom(position, finallyBlock.sourceEnd);
break;
case FINALLY_MUST_BE_INLINED:
// May loose some local variable initializations : affecting the local variable
// attributes
// needed since any exception handler got inlined subroutine
if (preTryInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, preTryInitStateIndex);
}
// entire sequence for finally is associated to finally block
finallyBlock.generateCode(scope, codeStream);
break;
case FINALLY_DOES_NOT_COMPLETE:
break;
}
}
} else {
// no subroutine, simply position end label (natural exit == end)
naturalExitLabel.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);
}
/** Code generation for a binary operation */
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (this.constant != Constant.NotAConstant) {
// inlined value
if (valueRequired) codeStream.generateConstant(this.constant, this.implicitConversion);
codeStream.recordPositionsFrom(pc, this.sourceStart);
return;
}
Constant cst = this.right.constant;
if (cst != Constant.NotAConstant) {
// <expr> || true --> true
if (cst.booleanValue() == true) {
this.left.generateCode(currentScope, codeStream, false);
if (valueRequired) codeStream.iconst_1();
} else {
// <expr>|| false --> <expr>
this.left.generateCode(currentScope, codeStream, valueRequired);
}
if (this.mergedInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
}
codeStream.generateImplicitConversion(this.implicitConversion);
codeStream.recordPositionsFrom(pc, this.sourceStart);
return;
}
BranchLabel trueLabel = new BranchLabel(codeStream), endLabel;
cst = this.left.optimizedBooleanConstant();
boolean leftIsConst = cst != Constant.NotAConstant;
boolean leftIsTrue = leftIsConst && cst.booleanValue() == true;
cst = this.right.optimizedBooleanConstant();
boolean rightIsConst = cst != Constant.NotAConstant;
boolean rightIsTrue = rightIsConst && cst.booleanValue() == true;
generateOperands:
{
if (leftIsConst) {
this.left.generateCode(currentScope, codeStream, false);
if (leftIsTrue) {
break generateOperands; // no need to generate right operand
}
} else {
this.left.generateOptimizedBoolean(currentScope, codeStream, trueLabel, null, true);
// need value, e.g. if (a == 1 || ((b = 2) > 0)) {} -> shouldn't initialize 'b' if a==1
}
if (this.rightInitStateIndex != -1) {
codeStream.addDefinitelyAssignedVariables(currentScope, this.rightInitStateIndex);
}
if (rightIsConst) {
this.right.generateCode(currentScope, codeStream, false);
} else {
this.right.generateOptimizedBoolean(
currentScope, codeStream, trueLabel, null, valueRequired);
}
}
if (this.mergedInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
}
/*
* improving code gen for such a case: boolean b = i < 0 || true since
* the label has never been used, we have the inlined value on the
* stack.
*/
if (valueRequired) {
if (leftIsConst && leftIsTrue) {
codeStream.iconst_1();
codeStream.recordPositionsFrom(codeStream.position, this.left.sourceEnd);
} else {
if (rightIsConst && rightIsTrue) {
codeStream.iconst_1();
codeStream.recordPositionsFrom(codeStream.position, this.left.sourceEnd);
} else {
codeStream.iconst_0();
}
if (trueLabel.forwardReferenceCount() > 0) {
if ((this.bits & IsReturnedValue) != 0) {
codeStream.generateImplicitConversion(this.implicitConversion);
codeStream.generateReturnBytecode(this);
trueLabel.place();
codeStream.iconst_1();
} else {
codeStream.goto_(endLabel = new BranchLabel(codeStream));
codeStream.decrStackSize(1);
trueLabel.place();
codeStream.iconst_1();
endLabel.place();
}
} else {
trueLabel.place();
}
}
codeStream.generateImplicitConversion(this.implicitConversion);
codeStream.recordPositionsFrom(codeStream.position, this.sourceEnd);
} else {
trueLabel.place();
}
}
/** Boolean operator code generation Optimized operations are: || */
public void generateOptimizedBoolean(
BlockScope currentScope,
CodeStream codeStream,
BranchLabel trueLabel,
BranchLabel falseLabel,
boolean valueRequired) {
if (this.constant != Constant.NotAConstant) {
super.generateOptimizedBoolean(
currentScope, codeStream, trueLabel, falseLabel, valueRequired);
return;
}
// <expr> || false --> <expr>
Constant cst = this.right.constant;
if (cst != Constant.NotAConstant && cst.booleanValue() == false) {
int pc = codeStream.position;
this.left.generateOptimizedBoolean(
currentScope, codeStream, trueLabel, falseLabel, valueRequired);
if (this.mergedInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
return;
}
cst = this.left.optimizedBooleanConstant();
boolean leftIsConst = cst != Constant.NotAConstant;
boolean leftIsTrue = leftIsConst && cst.booleanValue() == true;
cst = this.right.optimizedBooleanConstant();
boolean rightIsConst = cst != Constant.NotAConstant;
boolean rightIsTrue = rightIsConst && cst.booleanValue() == true;
// default case
generateOperands:
{
if (falseLabel == null) {
if (trueLabel != null) {
// implicit falling through the FALSE case
this.left.generateOptimizedBoolean(
currentScope, codeStream, trueLabel, null, !leftIsConst);
// need value, e.g. if (a == 1 || ((b = 2) > 0)) {} -> shouldn't initialize 'b' if a==1
if (leftIsTrue) {
if (valueRequired) codeStream.goto_(trueLabel);
codeStream.recordPositionsFrom(codeStream.position, this.left.sourceEnd);
break generateOperands; // no need to generate right operand
}
if (this.rightInitStateIndex != -1) {
codeStream.addDefinitelyAssignedVariables(currentScope, this.rightInitStateIndex);
}
this.right.generateOptimizedBoolean(
currentScope, codeStream, trueLabel, null, valueRequired && !rightIsConst);
if (valueRequired && rightIsTrue) {
codeStream.goto_(trueLabel);
codeStream.recordPositionsFrom(codeStream.position, this.sourceEnd);
}
}
} else {
// implicit falling through the TRUE case
if (trueLabel == null) {
BranchLabel internalTrueLabel = new BranchLabel(codeStream);
this.left.generateOptimizedBoolean(
currentScope, codeStream, internalTrueLabel, null, !leftIsConst);
// need value, e.g. if (a == 1 || ((b = 2) > 0)) {} -> shouldn't initialize 'b' if a==1
if (leftIsTrue) {
internalTrueLabel.place();
break generateOperands; // no need to generate right operand
}
if (this.rightInitStateIndex != -1) {
codeStream.addDefinitelyAssignedVariables(currentScope, this.rightInitStateIndex);
}
this.right.generateOptimizedBoolean(
currentScope, codeStream, null, falseLabel, valueRequired && !rightIsConst);
int pc = codeStream.position;
if (valueRequired && rightIsConst && !rightIsTrue) {
codeStream.goto_(falseLabel);
codeStream.recordPositionsFrom(pc, this.sourceEnd);
}
internalTrueLabel.place();
} else {
// no implicit fall through TRUE/FALSE --> should never occur
}
}
}
if (this.mergedInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
}
}
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
if (!valueRequired) currentScope.problemReporter().unusedObjectAllocation(this);
int pc = codeStream.position;
MethodBinding codegenBinding = this.binding.original();
ReferenceBinding allocatedType = codegenBinding.declaringClass;
codeStream.new_(allocatedType);
boolean isUnboxing = (this.implicitConversion & TypeIds.UNBOXING) != 0;
if (valueRequired || isUnboxing) {
codeStream.dup();
}
// better highlight for allocation: display the type individually
if (this.type != null) { // null for enum constant body
codeStream.recordPositionsFrom(pc, this.type.sourceStart);
} else {
// push enum constant name and ordinal
codeStream.ldc(String.valueOf(this.enumConstant.name));
codeStream.generateInlinedValue(this.enumConstant.binding.id);
}
// handling innerclass instance allocation - enclosing instance arguments
if (allocatedType.isNestedType()) {
codeStream.generateSyntheticEnclosingInstanceValues(
currentScope, allocatedType, enclosingInstance(), this);
}
// generate the arguments for constructor
generateArguments(this.binding, this.arguments, currentScope, codeStream);
// handling innerclass instance allocation - outer local arguments
if (allocatedType.isNestedType()) {
codeStream.generateSyntheticOuterArgumentValues(currentScope, allocatedType, this);
}
// invoke constructor
if (this.syntheticAccessor == null) {
codeStream.invoke(
Opcodes.OPC_invokespecial, codegenBinding, null /* default declaringClass */);
} else {
// synthetic accessor got some extra arguments appended to its signature, which need values
for (int i = 0,
max = this.syntheticAccessor.parameters.length - codegenBinding.parameters.length;
i < max;
i++) {
codeStream.aconst_null();
}
codeStream.invoke(
Opcodes.OPC_invokespecial, this.syntheticAccessor, null /* default declaringClass */);
}
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else if (isUnboxing) {
// conversion only generated if unboxing
codeStream.generateImplicitConversion(this.implicitConversion);
switch (postConversionType(currentScope).id) {
case T_long:
case T_double:
codeStream.pop2();
break;
default:
codeStream.pop();
}
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/** Code generation for a array initializer */
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
// Flatten the values and compute the dimensions, by iterating in depth into nested array
// initializers
int pc = codeStream.position;
int expressionLength = (this.expressions == null) ? 0 : this.expressions.length;
codeStream.generateInlinedValue(expressionLength);
codeStream.newArray(this.binding);
if (this.expressions != null) {
// binding is an ArrayType, so I can just deal with the dimension
int elementsTypeID = this.binding.dimensions > 1 ? -1 : this.binding.leafComponentType.id;
for (int i = 0; i < expressionLength; i++) {
Expression expr;
if ((expr = this.expressions[i]).constant != Constant.NotAConstant) {
switch (elementsTypeID) { // filter out initializations to default values
case T_int:
case T_short:
case T_byte:
case T_char:
case T_long:
if (expr.constant.longValue() != 0) {
codeStream.dup();
codeStream.generateInlinedValue(i);
expr.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(elementsTypeID, false);
}
break;
case T_float:
case T_double:
double constantValue = expr.constant.doubleValue();
if (constantValue == -0.0 || constantValue != 0) {
codeStream.dup();
codeStream.generateInlinedValue(i);
expr.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(elementsTypeID, false);
}
break;
case T_boolean:
if (expr.constant.booleanValue() != false) {
codeStream.dup();
codeStream.generateInlinedValue(i);
expr.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(elementsTypeID, false);
}
break;
default:
if (!(expr instanceof NullLiteral)) {
codeStream.dup();
codeStream.generateInlinedValue(i);
expr.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(elementsTypeID, false);
}
}
} else if (!(expr instanceof NullLiteral)) {
codeStream.dup();
codeStream.generateInlinedValue(i);
expr.generateCode(currentScope, codeStream, true);
codeStream.arrayAtPut(elementsTypeID, false);
}
}
}
if (valueRequired) {
codeStream.generateImplicitConversion(this.implicitConversion);
} else {
codeStream.pop();
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/**
* Try statement code generation with or without jsr bytecode use post 1.5 target level, cannot
* use jsr bytecode, must instead inline finally block returnAddress is only allocated if jsr is
* allowed
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
if ((this.bits & ASTNode.IsReachable) == 0) {
return;
}
boolean isStackMapFrameCodeStream = codeStream instanceof StackMapFrameCodeStream;
// in case the labels needs to be reinitialized
// when the code generation is restarted in wide mode
this.anyExceptionLabel = null;
this.reusableJSRTargets = null;
this.reusableJSRSequenceStartLabels = null;
this.reusableJSRTargetsCount = 0;
int pc = codeStream.position;
int finallyMode = finallyMode();
boolean requiresNaturalExit = false;
// preparing exception labels
int maxCatches = this.catchArguments == null ? 0 : this.catchArguments.length;
ExceptionLabel[] exceptionLabels;
if (maxCatches > 0) {
exceptionLabels = new ExceptionLabel[maxCatches];
for (int i = 0; i < maxCatches; i++) {
ExceptionLabel exceptionLabel =
new ExceptionLabel(codeStream, this.catchArguments[i].binding.type);
exceptionLabel.placeStart();
exceptionLabels[i] = exceptionLabel;
}
} else {
exceptionLabels = null;
}
if (this.subRoutineStartLabel != null) {
this.subRoutineStartLabel.initialize(codeStream);
enterAnyExceptionHandler(codeStream);
}
// generate the try block
try {
this.declaredExceptionLabels = exceptionLabels;
this.tryBlock.generateCode(this.scope, codeStream);
} finally {
this.declaredExceptionLabels = null;
}
boolean tryBlockHasSomeCode = codeStream.position != pc;
// flag telling if some bytecodes were issued inside the try block
// place end positions of user-defined exception labels
if (tryBlockHasSomeCode) {
// natural exit may require subroutine invocation (if finally != null)
BranchLabel naturalExitLabel = new BranchLabel(codeStream);
BranchLabel postCatchesFinallyLabel = null;
for (int i = 0; i < maxCatches; i++) {
exceptionLabels[i].placeEnd();
}
if ((this.bits & ASTNode.IsTryBlockExiting) == 0) {
int position = codeStream.position;
switch (finallyMode) {
case FINALLY_SUBROUTINE:
case FINALLY_INLINE:
requiresNaturalExit = true;
if (this.naturalExitMergeInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
codeStream.addDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
}
codeStream.goto_(naturalExitLabel);
break;
case NO_FINALLY:
if (this.naturalExitMergeInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
codeStream.addDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
}
codeStream.goto_(naturalExitLabel);
break;
case FINALLY_DOES_NOT_COMPLETE:
codeStream.goto_(this.subRoutineStartLabel);
break;
}
codeStream.updateLastRecordedEndPC(this.tryBlock.scope, position);
// goto is tagged as part of the try block
}
/* 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.
*/
exitAnyExceptionHandler();
if (this.catchArguments != null) {
postCatchesFinallyLabel = new BranchLabel(codeStream);
for (int i = 0; i < maxCatches; i++) {
/*
* This should not happen. For consistency purpose, if the exception label is never used
* we also don't generate the corresponding catch block, otherwise we have some
* unreachable bytecodes
*/
if (exceptionLabels[i].count == 0) continue;
enterAnyExceptionHandler(codeStream);
// May loose some local variable initializations : affecting the local variable attributes
if (this.preTryInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.preTryInitStateIndex);
codeStream.addDefinitelyAssignedVariables(currentScope, this.preTryInitStateIndex);
}
codeStream.pushExceptionOnStack(exceptionLabels[i].exceptionType);
exceptionLabels[i].place();
// optimizing the case where the exception variable is not actually used
LocalVariableBinding catchVar;
int varPC = codeStream.position;
if ((catchVar = this.catchArguments[i].binding).resolvedPosition != -1) {
codeStream.store(catchVar, false);
catchVar.recordInitializationStartPC(codeStream.position);
codeStream.addVisibleLocalVariable(catchVar);
} else {
codeStream.pop();
}
codeStream.recordPositionsFrom(varPC, this.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)
this.catchBlocks[i].generateCode(this.scope, codeStream);
exitAnyExceptionHandler();
if (!this.catchExits[i]) {
switch (finallyMode) {
case FINALLY_INLINE:
// inlined finally here can see all merged variables
if (isStackMapFrameCodeStream) {
((StackMapFrameCodeStream) codeStream)
.pushStateIndex(this.naturalExitMergeInitStateIndex);
}
if (this.catchExitInitStateIndexes[i] != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.catchExitInitStateIndexes[i]);
codeStream.addDefinitelyAssignedVariables(
currentScope, this.catchExitInitStateIndexes[i]);
}
// entire sequence for finally is associated to finally block
this.finallyBlock.generateCode(this.scope, codeStream);
codeStream.goto_(postCatchesFinallyLabel);
if (isStackMapFrameCodeStream) {
((StackMapFrameCodeStream) codeStream).popStateIndex();
}
break;
case FINALLY_SUBROUTINE:
requiresNaturalExit = true;
// $FALL-THROUGH$
case NO_FINALLY:
if (this.naturalExitMergeInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
codeStream.addDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
}
codeStream.goto_(naturalExitLabel);
break;
case FINALLY_DOES_NOT_COMPLETE:
codeStream.goto_(this.subRoutineStartLabel);
break;
}
}
}
}
// extra handler for trailing natural exit (will be fixed up later on when natural exit is
// generated below)
ExceptionLabel naturalExitExceptionHandler =
requiresNaturalExit && (finallyMode == FINALLY_SUBROUTINE)
? new ExceptionLabel(codeStream, null)
: null;
// 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 (this.subRoutineStartLabel != null && this.anyExceptionLabel.count != 0) {
codeStream.pushExceptionOnStack(this.scope.getJavaLangThrowable());
if (this.preTryInitStateIndex != -1) {
// reset initialization state, as for a normal catch block
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.preTryInitStateIndex);
codeStream.addDefinitelyAssignedVariables(currentScope, this.preTryInitStateIndex);
}
placeAllAnyExceptionHandler();
if (naturalExitExceptionHandler != null) naturalExitExceptionHandler.place();
switch (finallyMode) {
case FINALLY_SUBROUTINE:
// any exception handler
codeStream.store(this.anyExceptionVariable, false);
codeStream.jsr(this.subRoutineStartLabel);
codeStream.recordPositionsFrom(finallySequenceStartPC, this.finallyBlock.sourceStart);
int position = codeStream.position;
codeStream.throwAnyException(this.anyExceptionVariable);
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceEnd);
// subroutine
this.subRoutineStartLabel.place();
codeStream.pushExceptionOnStack(this.scope.getJavaLangThrowable());
position = codeStream.position;
codeStream.store(this.returnAddressVariable, false);
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceStart);
this.finallyBlock.generateCode(this.scope, codeStream);
position = codeStream.position;
codeStream.ret(this.returnAddressVariable.resolvedPosition);
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceEnd);
// the ret bytecode is part of the subroutine
break;
case FINALLY_INLINE:
// any exception handler
codeStream.store(this.anyExceptionVariable, false);
codeStream.addVariable(this.anyExceptionVariable);
codeStream.recordPositionsFrom(finallySequenceStartPC, this.finallyBlock.sourceStart);
// subroutine
this.finallyBlock.generateCode(currentScope, codeStream);
position = codeStream.position;
codeStream.throwAnyException(this.anyExceptionVariable);
codeStream.removeVariable(this.anyExceptionVariable);
if (this.preTryInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.preTryInitStateIndex);
}
this.subRoutineStartLabel.place();
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceEnd);
break;
case FINALLY_DOES_NOT_COMPLETE:
// any exception handler
codeStream.pop();
this.subRoutineStartLabel.place();
codeStream.recordPositionsFrom(finallySequenceStartPC, this.finallyBlock.sourceStart);
// subroutine
this.finallyBlock.generateCode(this.scope, codeStream);
break;
}
// will naturally fall into subsequent code after subroutine invocation
if (requiresNaturalExit) {
switch (finallyMode) {
case FINALLY_SUBROUTINE:
naturalExitLabel.place();
int position = codeStream.position;
naturalExitExceptionHandler.placeStart();
codeStream.jsr(this.subRoutineStartLabel);
naturalExitExceptionHandler.placeEnd();
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceEnd);
break;
case FINALLY_INLINE:
// inlined finally here can see all merged variables
if (isStackMapFrameCodeStream) {
((StackMapFrameCodeStream) codeStream)
.pushStateIndex(this.naturalExitMergeInitStateIndex);
}
if (this.naturalExitMergeInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
codeStream.addDefinitelyAssignedVariables(
currentScope, this.naturalExitMergeInitStateIndex);
}
naturalExitLabel.place();
// entire sequence for finally is associated to finally block
this.finallyBlock.generateCode(this.scope, codeStream);
if (postCatchesFinallyLabel != null) {
position = codeStream.position;
// entire sequence for finally is associated to finally block
codeStream.goto_(postCatchesFinallyLabel);
codeStream.recordPositionsFrom(position, this.finallyBlock.sourceEnd);
}
if (isStackMapFrameCodeStream) {
((StackMapFrameCodeStream) codeStream).popStateIndex();
}
break;
case FINALLY_DOES_NOT_COMPLETE:
break;
default:
naturalExitLabel.place();
break;
}
}
if (postCatchesFinallyLabel != null) {
postCatchesFinallyLabel.place();
}
} else {
// no subroutine, simply position end label (natural exit == end)
naturalExitLabel.place();
}
} else {
// try block had no effect, only generate the body of the finally block if any
if (this.subRoutineStartLabel != null) {
this.finallyBlock.generateCode(this.scope, codeStream);
}
}
// May loose some local variable initializations : affecting the local variable attributes
if (this.mergedInitStateIndex != -1) {
codeStream.removeNotDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
codeStream.addDefinitelyAssignedVariables(currentScope, this.mergedInitStateIndex);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}