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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.turbine.binder.bytecode;
import static java.util.Objects.requireNonNull;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.turbine.binder.bound.EnumConstantValue;
import com.google.turbine.binder.bound.ModuleInfo;
import com.google.turbine.binder.bound.TurbineAnnotationValue;
import com.google.turbine.binder.bound.TurbineClassValue;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.binder.sym.FieldSymbol;
import com.google.turbine.binder.sym.TyVarSymbol;
import com.google.turbine.bytecode.ClassFile;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo.ElementValue;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo.ElementValue.ArrayValue;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo.ElementValue.ConstTurbineClassValue;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo.ElementValue.ConstValue;
import com.google.turbine.bytecode.ClassFile.AnnotationInfo.ElementValue.EnumConstValue;
import com.google.turbine.bytecode.ClassReader;
import com.google.turbine.bytecode.sig.Sig;
import com.google.turbine.bytecode.sig.Sig.LowerBoundTySig;
import com.google.turbine.bytecode.sig.Sig.UpperBoundTySig;
import com.google.turbine.bytecode.sig.Sig.WildTySig;
import com.google.turbine.bytecode.sig.SigParser;
import com.google.turbine.model.Const;
import com.google.turbine.model.Const.ArrayInitValue;
import com.google.turbine.model.Const.Value;
import com.google.turbine.type.AnnoInfo;
import com.google.turbine.type.Type;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.function.Supplier;
/** Bind {@link Type}s from bytecode. */
public final class BytecodeBinder {
static Type.ClassTy bindClassTy(Sig.ClassTySig sig, Function<String, TyVarSymbol> scope) {
StringBuilder sb = new StringBuilder(sig.pkg());
boolean first = true;
List<Type.ClassTy.SimpleClassTy> classes = new ArrayList<>();
for (Sig.SimpleClassTySig s : sig.classes()) {
sb.append(first ? '/' : '$');
sb.append(s.simpleName());
ClassSymbol sym = new ClassSymbol(sb.toString());
ImmutableList.Builder<Type> tyArgs = ImmutableList.builder();
for (Sig.TySig arg : s.tyArgs()) {
tyArgs.add(bindTy(arg, scope));
}
classes.add(Type.ClassTy.SimpleClassTy.create(sym, tyArgs.build(), ImmutableList.of()));
first = false;
}
return Type.ClassTy.create(classes);
}
private static Type wildTy(WildTySig sig, Function<String, TyVarSymbol> scope) {
switch (sig.boundKind()) {
case NONE:
return Type.WildUnboundedTy.create(ImmutableList.of());
case LOWER:
return Type.WildLowerBoundedTy.create(
bindTy(((LowerBoundTySig) sig).bound(), scope), ImmutableList.of());
case UPPER:
return Type.WildUpperBoundedTy.create(
bindTy(((UpperBoundTySig) sig).bound(), scope), ImmutableList.of());
}
throw new AssertionError(sig.boundKind());
}
static Type bindTy(Sig.TySig sig, Function<String, TyVarSymbol> scope) {
switch (sig.kind()) {
case BASE_TY_SIG:
return Type.PrimTy.create(((Sig.BaseTySig) sig).type(), ImmutableList.of());
case CLASS_TY_SIG:
return bindClassTy((Sig.ClassTySig) sig, scope);
case TY_VAR_SIG:
return Type.TyVar.create(scope.apply(((Sig.TyVarSig) sig).name()), ImmutableList.of());
case ARRAY_TY_SIG:
return bindArrayTy((Sig.ArrayTySig) sig, scope);
case WILD_TY_SIG:
return wildTy((WildTySig) sig, scope);
case VOID_TY_SIG:
return Type.VOID;
}
throw new AssertionError(sig.kind());
}
private static Type bindArrayTy(Sig.ArrayTySig arrayTySig, Function<String, TyVarSymbol> scope) {
return Type.ArrayTy.create(bindTy(arrayTySig.elementType(), scope), ImmutableList.of());
}
public static Const bindValue(ElementValue value) {
switch (value.kind()) {
case ENUM:
return bindEnumValue((EnumConstValue) value);
case CONST:
return ((ConstValue) value).value();
case ARRAY:
return bindArrayValue((ArrayValue) value);
case CLASS:
return new TurbineClassValue(
bindTy(
new SigParser(((ConstTurbineClassValue) value).className()).parseType(),
x -> {
throw new IllegalStateException(x);
}));
case ANNOTATION:
return bindAnnotationValue(((ElementValue.ConstTurbineAnnotationValue) value).annotation());
}
throw new AssertionError(value.kind());
}
static TurbineAnnotationValue bindAnnotationValue(AnnotationInfo value) {
ClassSymbol sym = asClassSymbol(value.typeName());
ImmutableMap.Builder<String, Const> values = ImmutableMap.builder();
for (Map.Entry<String, ElementValue> e : value.elementValuePairs().entrySet()) {
values.put(e.getKey(), bindValue(e.getValue()));
}
return new TurbineAnnotationValue(new AnnoInfo(null, sym, null, values.buildOrThrow()));
}
static ImmutableList<AnnoInfo> bindAnnotations(List<AnnotationInfo> input) {
ImmutableList.Builder<AnnoInfo> result = ImmutableList.builder();
for (AnnotationInfo annotation : input) {
TurbineAnnotationValue anno = bindAnnotationValue(annotation);
if (!shouldSkip(anno)) {
result.add(anno.info());
}
}
return result.build();
}
private static boolean shouldSkip(TurbineAnnotationValue anno) {
// ct.sym contains fake annotations without corresponding class files.
return anno.sym().equals(ClassSymbol.PROFILE_ANNOTATION)
|| anno.sym().equals(ClassSymbol.PROPRIETARY_ANNOTATION);
}
private static ClassSymbol asClassSymbol(String s) {
return new ClassSymbol(s.substring(1, s.length() - 1));
}
private static Const bindArrayValue(ArrayValue value) {
ImmutableList.Builder<Const> elements = ImmutableList.builder();
for (ElementValue element : value.elements()) {
elements.add(bindValue(element));
}
return new ArrayInitValue(elements.build());
}
public static Const.Value bindConstValue(Type type, Const.Value value) {
if (type.tyKind() != Type.TyKind.PRIM_TY) {
return value;
}
// Deficient numberic types and booleans are all stored as ints in the class file,
// coerce them to the target type.
// TODO(b/32626659): this is not bug-compatible with javac
switch (((Type.PrimTy) type).primkind()) {
case CHAR:
return new Const.CharValue((char) asInt(value));
case SHORT:
return new Const.ShortValue((short) asInt(value));
case BOOLEAN:
// boolean constants are encoded as integers
return new Const.BooleanValue(asInt(value) != 0);
case BYTE:
return new Const.ByteValue((byte) asInt(value));
default:
return value;
}
}
private static int asInt(Value value) {
return ((Const.IntValue) value).value();
}
private static Const bindEnumValue(EnumConstValue value) {
return new EnumConstantValue(
new FieldSymbol(asClassSymbol(value.typeName()), value.constName()));
}
/**
* Returns a {@link ModuleInfo} given a module-info class file. Currently only the module's name,
* version, and flags are populated, since the directives are not needed by turbine at compile
* time.
*/
public static ModuleInfo bindModuleInfo(String path, Supplier<byte[]> bytes) {
ClassFile classFile = ClassReader.read(path, bytes.get());
ClassFile.ModuleInfo module = classFile.module();
requireNonNull(module, path);
return new ModuleInfo(
module.name(),
module.version(),
module.flags(),
/* annos= */ ImmutableList.of(),
/* requires= */ ImmutableList.of(),
/* exports= */ ImmutableList.of(),
/* opens= */ ImmutableList.of(),
/* uses= */ ImmutableList.of(),
/* provides= */ ImmutableList.of());
}
private BytecodeBinder() {}
}
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