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);
}