org.eclipse.jdt.internal.compiler.ast.Clinit Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ecj Show documentation
Show all versions of ecj Show documentation
This is Eclipse JDT Core Batch Compiler used by Scout SDK
The newest version!
/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Patrick Wienands - Contribution for bug 393749
* Stephan Herrmann - Contribution for
* bug 331649 - [compiler][null] consider null annotations for fields
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.ClassFile;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.codegen.BranchLabel;
import org.eclipse.jdt.internal.compiler.codegen.CodeStream;
import org.eclipse.jdt.internal.compiler.codegen.ConstantPool;
import org.eclipse.jdt.internal.compiler.codegen.Opcodes;
import org.eclipse.jdt.internal.compiler.flow.ExceptionHandlingFlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.flow.InitializationFlowContext;
import org.eclipse.jdt.internal.compiler.lookup.Binding;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
import org.eclipse.jdt.internal.compiler.lookup.MethodScope;
import org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.SyntheticMethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import org.eclipse.jdt.internal.compiler.parser.Parser;
import org.eclipse.jdt.internal.compiler.problem.AbortMethod;
public class Clinit extends AbstractMethodDeclaration {
private static int ENUM_CONSTANTS_THRESHOLD = 2000;
private FieldBinding assertionSyntheticFieldBinding = null;
private FieldBinding classLiteralSyntheticField = null;
public Clinit(CompilationResult compilationResult) {
super(compilationResult);
this.modifiers = 0;
this.selector = TypeConstants.CLINIT;
}
public void analyseCode(
ClassScope classScope,
InitializationFlowContext staticInitializerFlowContext,
FlowInfo flowInfo) {
if (this.ignoreFurtherInvestigation)
return;
try {
ExceptionHandlingFlowContext clinitContext =
new ExceptionHandlingFlowContext(
staticInitializerFlowContext.parent,
this,
Binding.NO_EXCEPTIONS,
staticInitializerFlowContext,
this.scope,
FlowInfo.DEAD_END);
// check for missing returning path
if ((flowInfo.tagBits & FlowInfo.UNREACHABLE_OR_DEAD) == 0) {
this.bits |= ASTNode.NeedFreeReturn;
}
// check missing blank final field initializations
flowInfo = flowInfo.mergedWith(staticInitializerFlowContext.initsOnReturn);
FieldBinding[] fields = this.scope.enclosingSourceType().fields();
for (int i = 0, count = fields.length; i < count; i++) {
FieldBinding field = fields[i];
if (field.isStatic()) {
if (!flowInfo.isDefinitelyAssigned(field)) {
if (field.isFinal()) {
this.scope.problemReporter().uninitializedBlankFinalField(
field,
this.scope.referenceType().declarationOf(field.original()));
// can complain against the field decl, since only one
} else if (field.isNonNull()) {
this.scope.problemReporter().uninitializedNonNullField(
field,
this.scope.referenceType().declarationOf(field.original()));
}
}
}
}
// check static initializers thrown exceptions
staticInitializerFlowContext.checkInitializerExceptions(
this.scope,
clinitContext,
flowInfo);
} catch (AbortMethod e) {
this.ignoreFurtherInvestigation = true;
}
}
/**
* Bytecode generation for a method
*
* @param classScope org.eclipse.jdt.internal.compiler.lookup.ClassScope
* @param classFile org.eclipse.jdt.internal.compiler.codegen.ClassFile
*/
public void generateCode(ClassScope classScope, ClassFile classFile) {
int clinitOffset = 0;
if (this.ignoreFurtherInvestigation) {
// should never have to add any problem method
return;
}
CompilationResult unitResult = null;
int problemCount = 0;
if (classScope != null) {
TypeDeclaration referenceContext = classScope.referenceContext;
if (referenceContext != null) {
unitResult = referenceContext.compilationResult();
problemCount = unitResult.problemCount;
}
}
boolean restart = false;
do {
try {
clinitOffset = classFile.contentsOffset;
this.generateCode(classScope, classFile, clinitOffset);
restart = false;
} catch (AbortMethod e) {
// should never occur
// the clinit referenceContext is the type declaration
// All clinit problems will be reported against the type: AbortType instead of AbortMethod
// reset the contentsOffset to the value before generating the clinit code
// decrement the number of method info as well.
// This is done in the addProblemMethod and addProblemConstructor for other
// cases.
if (e.compilationResult == CodeStream.RESTART_IN_WIDE_MODE) {
// a branch target required a goto_w, restart code gen in wide mode.
classFile.contentsOffset = clinitOffset;
classFile.methodCount--;
classFile.codeStream.resetInWideMode(); // request wide mode
// reset the problem count to prevent reporting the same warning twice
if (unitResult != null) {
unitResult.problemCount = problemCount;
}
// restart method generation
restart = true;
} else if (e.compilationResult == CodeStream.RESTART_CODE_GEN_FOR_UNUSED_LOCALS_MODE) {
classFile.contentsOffset = clinitOffset;
classFile.methodCount--;
classFile.codeStream.resetForCodeGenUnusedLocals();
// reset the problem count to prevent reporting the same warning twice
if (unitResult != null) {
unitResult.problemCount = problemCount;
}
// restart method generation
restart = true;
} else {
// produce a problem method accounting for this fatal error
classFile.contentsOffset = clinitOffset;
classFile.methodCount--;
restart = false;
}
}
} while (restart);
}
/**
* Bytecode generation for a method
*
* @param classScope org.eclipse.jdt.internal.compiler.lookup.ClassScope
* @param classFile org.eclipse.jdt.internal.compiler.codegen.ClassFile
*/
private void generateCode(
ClassScope classScope,
ClassFile classFile,
int clinitOffset) {
ConstantPool constantPool = classFile.constantPool;
int constantPoolOffset = constantPool.currentOffset;
int constantPoolIndex = constantPool.currentIndex;
classFile.generateMethodInfoHeaderForClinit();
int codeAttributeOffset = classFile.contentsOffset;
classFile.generateCodeAttributeHeader();
CodeStream codeStream = classFile.codeStream;
resolve(classScope);
codeStream.reset(this, classFile);
TypeDeclaration declaringType = classScope.referenceContext;
// initialize local positions - including initializer scope.
MethodScope staticInitializerScope = declaringType.staticInitializerScope;
staticInitializerScope.computeLocalVariablePositions(0, codeStream);
// 1.4 feature
// This has to be done before any other initialization
if (this.assertionSyntheticFieldBinding != null) {
// generate code related to the activation of assertion for this class
codeStream.generateClassLiteralAccessForType(
classScope.outerMostClassScope().enclosingSourceType(),
this.classLiteralSyntheticField);
codeStream.invokeJavaLangClassDesiredAssertionStatus();
BranchLabel falseLabel = new BranchLabel(codeStream);
codeStream.ifne(falseLabel);
codeStream.iconst_1();
BranchLabel jumpLabel = new BranchLabel(codeStream);
codeStream.decrStackSize(1);
codeStream.goto_(jumpLabel);
falseLabel.place();
codeStream.iconst_0();
jumpLabel.place();
codeStream.fieldAccess(Opcodes.OPC_putstatic, this.assertionSyntheticFieldBinding, null /* default declaringClass */);
}
// generate static fields/initializers/enum constants
final FieldDeclaration[] fieldDeclarations = declaringType.fields;
int sourcePosition = -1;
int remainingFieldCount = 0;
if (TypeDeclaration.kind(declaringType.modifiers) == TypeDeclaration.ENUM_DECL) {
int enumCount = declaringType.enumConstantsCounter;
if (enumCount > ENUM_CONSTANTS_THRESHOLD) {
// generate synthetic methods to initialize all the enum constants
int begin = -1;
int count = 0;
if (fieldDeclarations != null) {
int max = fieldDeclarations.length;
for (int i = 0; i < max; i++) {
FieldDeclaration fieldDecl = fieldDeclarations[i];
if (fieldDecl.isStatic()) {
if (fieldDecl.getKind() == AbstractVariableDeclaration.ENUM_CONSTANT) {
if (begin == -1) {
begin = i;
}
count++;
if (count > ENUM_CONSTANTS_THRESHOLD) {
SyntheticMethodBinding syntheticMethod = declaringType.binding.addSyntheticMethodForEnumInitialization(begin, i);
codeStream.invoke(Opcodes.OPC_invokestatic, syntheticMethod, null /* default declaringClass */);
begin = i;
count = 1;
}
} else {
remainingFieldCount++;
}
}
}
if (count != 0) {
// add last synthetic method
SyntheticMethodBinding syntheticMethod = declaringType.binding.addSyntheticMethodForEnumInitialization(begin, max);
codeStream.invoke(Opcodes.OPC_invokestatic, syntheticMethod, null /* default declaringClass */);
}
}
} else if (fieldDeclarations != null) {
for (int i = 0, max = fieldDeclarations.length; i < max; i++) {
FieldDeclaration fieldDecl = fieldDeclarations[i];
if (fieldDecl.isStatic()) {
if (fieldDecl.getKind() == AbstractVariableDeclaration.ENUM_CONSTANT) {
fieldDecl.generateCode(staticInitializerScope, codeStream);
} else {
remainingFieldCount++;
}
}
}
}
// enum need to initialize $VALUES synthetic cache of enum constants
// $VALUES := new []
codeStream.generateInlinedValue(enumCount);
codeStream.anewarray(declaringType.binding);
if (enumCount > 0) {
if (fieldDeclarations != null) {
for (int i = 0, max = fieldDeclarations.length; i < max; i++) {
FieldDeclaration fieldDecl = fieldDeclarations[i];
// $VALUES[i] =
if (fieldDecl.getKind() == AbstractVariableDeclaration.ENUM_CONSTANT) {
codeStream.dup();
codeStream.generateInlinedValue(fieldDecl.binding.id);
codeStream.fieldAccess(Opcodes.OPC_getstatic, fieldDecl.binding, null /* default declaringClass */);
codeStream.aastore();
}
}
}
}
codeStream.fieldAccess(Opcodes.OPC_putstatic, declaringType.enumValuesSyntheticfield, null /* default declaringClass */);
if (remainingFieldCount != 0) {
// if fields that are not enum constants need to be generated (static initializer/static field)
for (int i = 0, max = fieldDeclarations.length; i < max && remainingFieldCount >= 0; i++) {
FieldDeclaration fieldDecl = fieldDeclarations[i];
switch (fieldDecl.getKind()) {
case AbstractVariableDeclaration.ENUM_CONSTANT :
break;
case AbstractVariableDeclaration.INITIALIZER :
if (!fieldDecl.isStatic()) {
break;
}
remainingFieldCount--;
sourcePosition = ((Initializer) fieldDecl).block.sourceEnd;
fieldDecl.generateCode(staticInitializerScope, codeStream);
break;
case AbstractVariableDeclaration.FIELD :
if (!fieldDecl.binding.isStatic()) {
break;
}
remainingFieldCount--;
sourcePosition = fieldDecl.declarationEnd;
fieldDecl.generateCode(staticInitializerScope, codeStream);
break;
}
}
}
} else {
if (fieldDeclarations != null) {
for (int i = 0, max = fieldDeclarations.length; i < max; i++) {
FieldDeclaration fieldDecl = fieldDeclarations[i];
switch (fieldDecl.getKind()) {
case AbstractVariableDeclaration.INITIALIZER :
if (!fieldDecl.isStatic())
break;
sourcePosition = ((Initializer) fieldDecl).block.sourceEnd;
fieldDecl.generateCode(staticInitializerScope, codeStream);
break;
case AbstractVariableDeclaration.FIELD :
if (!fieldDecl.binding.isStatic())
break;
sourcePosition = fieldDecl.declarationEnd;
fieldDecl.generateCode(staticInitializerScope, codeStream);
break;
}
}
}
}
if (codeStream.position == 0) {
// do not need to output a Clinit if no bytecodes
// so we reset the offset inside the byte array contents.
classFile.contentsOffset = clinitOffset;
// like we don't addd a method we need to undo the increment on the method count
classFile.methodCount--;
// reset the constant pool to its state before the clinit
constantPool.resetForClinit(constantPoolIndex, constantPoolOffset);
} else {
if ((this.bits & ASTNode.NeedFreeReturn) != 0) {
int before = codeStream.position;
codeStream.return_();
if (sourcePosition != -1) {
// expand the last initializer variables to include the trailing return
codeStream.recordPositionsFrom(before, sourcePosition);
}
}
// Record the end of the clinit: point to the declaration of the class
codeStream.recordPositionsFrom(0, declaringType.sourceStart);
classFile.completeCodeAttributeForClinit(codeAttributeOffset);
}
}
public boolean isClinit() {
return true;
}
public boolean isInitializationMethod() {
return true;
}
public boolean isStatic() {
return true;
}
public void parseStatements(Parser parser, CompilationUnitDeclaration unit) {
//the clinit is filled by hand ....
}
public StringBuffer print(int tab, StringBuffer output) {
printIndent(tab, output).append("()"); //$NON-NLS-1$
printBody(tab + 1, output);
return output;
}
public void resolve(ClassScope classScope) {
this.scope = new MethodScope(classScope, classScope.referenceContext, true);
}
public void traverse(
ASTVisitor visitor,
ClassScope classScope) {
visitor.visit(this, classScope);
visitor.endVisit(this, classScope);
}
public void setAssertionSupport(FieldBinding assertionSyntheticFieldBinding, boolean needClassLiteralField) {
this.assertionSyntheticFieldBinding = assertionSyntheticFieldBinding;
// we need to add the field right now, because the field infos are generated before the methods
if (needClassLiteralField) {
SourceTypeBinding sourceType =
this.scope.outerMostClassScope().enclosingSourceType();
// see https://bugs.eclipse.org/bugs/show_bug.cgi?id=22334
if (!sourceType.isInterface() && !sourceType.isBaseType()) {
this.classLiteralSyntheticField = sourceType.addSyntheticFieldForClassLiteral(sourceType, this.scope);
}
}
}
}