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/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.jjs.impl;
import com.google.gwt.dev.jjs.SourceInfo;
import com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JAbsentArrayDimension;
import com.google.gwt.dev.jjs.ast.JArrayRef;
import com.google.gwt.dev.jjs.ast.JArrayType;
import com.google.gwt.dev.jjs.ast.JBinaryOperation;
import com.google.gwt.dev.jjs.ast.JBinaryOperator;
import com.google.gwt.dev.jjs.ast.JExpression;
import com.google.gwt.dev.jjs.ast.JIntLiteral;
import com.google.gwt.dev.jjs.ast.JLiteral;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JMethodCall;
import com.google.gwt.dev.jjs.ast.JModVisitor;
import com.google.gwt.dev.jjs.ast.JNewArray;
import com.google.gwt.dev.jjs.ast.JNullType;
import com.google.gwt.dev.jjs.ast.JPrimitiveType;
import com.google.gwt.dev.jjs.ast.JProgram;
import com.google.gwt.dev.jjs.ast.JReferenceType;
import com.google.gwt.dev.jjs.ast.JType;
import com.google.gwt.dev.jjs.ast.js.JsCastMap;
import com.google.gwt.dev.jjs.ast.js.JsCastMap.JsQueryType;
import com.google.gwt.dev.jjs.ast.js.JsonArray;
import com.google.gwt.dev.util.collect.Lists;
/**
* Replace array accesses and instantiations with calls to the Array class.
* Depends on {@link CompoundAssignmentNormalizer} and {@link CastNormalizer}
* having already run.
*/
public class ArrayNormalizer {
private class ArrayVisitor extends JModVisitor {
@Override
public void endVisit(JBinaryOperation x, Context ctx) {
if (x.getOp() == JBinaryOperator.ASG && x.getLhs() instanceof JArrayRef) {
JArrayRef arrayRef = (JArrayRef) x.getLhs();
JType elementType = arrayRef.getType();
if (elementType instanceof JNullType) {
// will generate a null pointer exception instead
return;
}
/*
* See if we need to do a checked store. Primitives and (effectively)
* final are statically correct.
*/
if (elementType instanceof JReferenceType) {
if (!((JReferenceType) elementType).isFinal()
|| !program.typeOracle.canTriviallyCast((JReferenceType) x.getRhs().getType(),
(JReferenceType) elementType)) {
// replace this assignment with a call to setCheck()
JMethodCall call = new JMethodCall(x.getSourceInfo(), null, setCheckMethod);
call.addArgs(arrayRef.getInstance(), arrayRef.getIndexExpr(), x.getRhs());
ctx.replaceMe(call);
}
}
}
}
@Override
public void endVisit(JNewArray x, Context ctx) {
JArrayType type = x.getArrayType();
if (x.initializers != null) {
processInitializers(x, ctx, type);
} else {
int realDims = 0;
for (JExpression dim : x.dims) {
if (dim instanceof JAbsentArrayDimension) {
break;
}
++realDims;
}
assert (realDims >= 1);
if (realDims == 1) {
processDim(x, ctx, type);
} else {
processDims(x, ctx, type, realDims);
}
}
}
private JsQueryType getElementQueryType(SourceInfo sourceInfo, JArrayType arrayType) {
JType elementType = arrayType.getElementType();
int elementQueryId = -1;
if (elementType instanceof JReferenceType) {
JReferenceType elementRefType = (JReferenceType) elementType;
elementType = elementRefType.getUnderlyingType();
if (program.typeOracle.isEffectivelyJavaScriptObject(elementRefType)) {
/*
* treat types that are effectively JSO's as JSO's, for the purpose of
* castability checking
*/
elementRefType = program.getJavaScriptObject();
}
elementQueryId = program.getQueryId(elementRefType);
if (program.typeOracle.isDualJsoInterface(elementRefType)) {
/*
* invert the queryId, to indicate dual castability for JSO's and the
* Java type represented by the inverse of the queryId
*/
elementQueryId *= -1;
}
}
return new JsQueryType(sourceInfo, elementType, elementQueryId);
}
private JExpression getOrCreateCastMap(SourceInfo sourceInfo, JArrayType arrayType) {
JsCastMap castableTypeMap = program.getCastMap(arrayType);
if (castableTypeMap == null || castableTypeMap.getExprs().size() == 0) {
return new JsCastMap(sourceInfo, Lists.create(), program.getJavaScriptObject());
}
return castableTypeMap;
}
/**
* @see com.google.gwt.lang.Array regarding seed types
*/
private JIntLiteral getSeedTypeLiteralFor(JType type) {
if (type instanceof JPrimitiveType) {
if (type == program.getTypePrimitiveLong()) {
// The long type, thus 0L (index 3)
return program.getLiteralInt(3);
} else if (type == program.getTypePrimitiveBoolean()) {
// The boolean type, thus false (index 2)
return program.getLiteralInt(2);
} else {
// A numeric type, thus zero (index 1).
return program.getLiteralInt(1);
}
}
// An Object type, thus null (index 0).
return program.getLiteralInt(0);
}
private void processDim(JNewArray x, Context ctx, JArrayType arrayType) {
// override the type of the called method with the array's type
SourceInfo sourceInfo = x.getSourceInfo();
JMethodCall call = new JMethodCall(sourceInfo, null, initDim, arrayType);
JLiteral classLit = x.getClassLiteral();
JExpression castableTypeMap = getOrCreateCastMap(sourceInfo, arrayType);
JLiteral queryIdLit = getElementQueryType(sourceInfo, arrayType);
JExpression dim = x.dims.get(0);
JType elementType = arrayType.getElementType();
call.addArgs(classLit, castableTypeMap, queryIdLit, dim, getSeedTypeLiteralFor(elementType));
ctx.replaceMe(call);
}
private void processDims(JNewArray x, Context ctx, JArrayType arrayType, int dims) {
// override the type of the called method with the array's type
SourceInfo sourceInfo = x.getSourceInfo();
JMethodCall call = new JMethodCall(sourceInfo, null, initDims, arrayType);
JsonArray classLitList = new JsonArray(sourceInfo, program.getJavaScriptObject());
JsonArray castableTypeMapList = new JsonArray(sourceInfo, program.getJavaScriptObject());
JsonArray queryIdList = new JsonArray(sourceInfo, program.getJavaScriptObject());
JsonArray dimList = new JsonArray(sourceInfo, program.getJavaScriptObject());
JType cur = arrayType;
for (int i = 0; i < dims; ++i) {
// Walk down each type from most dims to least.
JArrayType curArrayType = (JArrayType) cur;
JLiteral classLit = x.getClassLiterals().get(i);
classLitList.getExprs().add(classLit);
JExpression castableTypeMap = getOrCreateCastMap(sourceInfo, curArrayType);
castableTypeMapList.getExprs().add(castableTypeMap);
JLiteral queryIdLit = getElementQueryType(sourceInfo, curArrayType);
queryIdList.getExprs().add(queryIdLit);
dimList.getExprs().add(x.dims.get(i));
cur = curArrayType.getElementType();
}
call.addArgs(classLitList, castableTypeMapList, queryIdList, dimList, program
.getLiteralInt(dims), getSeedTypeLiteralFor(cur));
ctx.replaceMe(call);
}
private void processInitializers(JNewArray x, Context ctx, JArrayType arrayType) {
// override the type of the called method with the array's type
SourceInfo sourceInfo = x.getSourceInfo();
JMethodCall call = new JMethodCall(sourceInfo, null, initValues, arrayType);
JLiteral classLit = x.getClassLiteral();
JExpression castableTypeMap = getOrCreateCastMap(sourceInfo, arrayType);
JLiteral queryIdLit = getElementQueryType(sourceInfo, arrayType);
JsonArray initList = new JsonArray(sourceInfo, program.getJavaScriptObject());
for (int i = 0; i < x.initializers.size(); ++i) {
initList.getExprs().add(x.initializers.get(i));
}
call.addArgs(classLit, castableTypeMap, queryIdLit, initList);
ctx.replaceMe(call);
}
}
public static void exec(JProgram program) {
new ArrayNormalizer(program).execImpl();
}
private final JMethod initDim;
private final JMethod initDims;
private final JMethod initValues;
private final JProgram program;
private final JMethod setCheckMethod;
private ArrayNormalizer(JProgram program) {
this.program = program;
setCheckMethod = program.getIndexedMethod("Array.setCheck");
initDim = program.getIndexedMethod("Array.initDim");
initDims = program.getIndexedMethod("Array.initDims");
initValues = program.getIndexedMethod("Array.initValues");
}
private void execImpl() {
ArrayVisitor visitor = new ArrayVisitor();
visitor.accept(program);
}
}
