/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package scalac.symtab.classfile;
import ch.epfl.lamp.util.Position;
import scalac.*;
import scalac.util.*;
import scalac.symtab.*;
import java.io.*;
import java.util.*;
//todo: don't keep statics module in scope.
public class ClassfileParser implements ClassfileConstants {
static final int CLASS_ATTR = SOURCEFILE_ATTR
| INNERCLASSES_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SCALA_ATTR
| JACO_ATTR;
static final int METH_ATTR = CODE_ATTR
| EXCEPTIONS_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR;
static final int FIELD_ATTR = CONSTANT_VALUE_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR;
protected Global global;
protected AbstractFileReader in;
protected Symbol c;
protected Type ctype;
protected Scope locals;
protected Scope statics;
protected JavaTypeFactory make;
protected Signatures sigs;
protected ConstantPool pool;
protected AttributeParser attrib;
protected Definitions defs;
public ClassfileParser(Global global, AbstractFileReader in, Symbol c) {
this.global = global;
this.in = in;
this.c = c;
this.ctype = c.typeConstructor();
this.make = new JavaTypeCreator(global);
this.sigs = new Signatures(global, make);
this.pool = new ConstantPool(in, sigs);
this.attrib = new AttributeParser(in, pool, this);
this.defs = global.definitions;
}
/** parse the classfile and throw IO exception if there is an
* error in the classfile structure
*/
public void parse() throws IOException {
try {
if (in.nextInt() != JAVA_MAGIC)
throw new IOException("illegal start of class file");
int minorVersion = in.nextChar();
int majorVersion = in.nextChar();
if ((majorVersion < JAVA_MAJOR_VERSION) ||
((majorVersion == JAVA_MAJOR_VERSION) &&
(minorVersion < JAVA_MINOR_VERSION)))
throw new IOException("class file has wrong version " +
majorVersion + "." + minorVersion + ", should be " +
JAVA_MAJOR_VERSION + "." + JAVA_MINOR_VERSION);
pool.indexPool();
int flags = in.nextChar();
Name name = readClassName(in.nextChar());
if (c.fullName() != name)
throw new IOException("class file '" + c.fullName() +
"' contains wrong class " + name);
// todo: correct flag transition
c.flags = transFlags(flags);
if ((c.flags & Modifiers.DEFERRED) != 0)
c.flags = c.flags & ~Modifiers.DEFERRED | Modifiers.ABSTRACT;
Type supertpe = readClassType(in.nextChar());
Type[] basetpes = new Type[in.nextChar() + 1];
this.locals = new Scope();
this.statics = new Scope();
// set type of class
Type classType = Type.compoundType(basetpes, locals, c);
c.setFirstInfo(classType);
// set type of statics
Symbol staticsClass = c.module().moduleClass();
if (staticsClass.isModuleClass()) {
Type staticsInfo = Type.compoundType(Type.EMPTY_ARRAY, statics, staticsClass);
staticsClass.setFirstInfo(staticsInfo);
c.module().setInfo(Type.TypeRef(staticsClass.owner().thisType(),
staticsClass, Type.EMPTY_ARRAY));
}
basetpes[0] = supertpe;
for (int i = 1; i < basetpes.length; i++)
basetpes[i] = readClassType(in.nextChar());
int fieldCount = in.nextChar();
for (int i = 0; i < fieldCount; i++)
parseField();
int methodCount = in.nextChar();
for (int i = 0; i < methodCount; i++)
parseMethod();
Symbol constr = c.primaryConstructor();
if (!constr.isInitialized()) {
constr.setFirstInfo(
Type.MethodType(Symbol.EMPTY_ARRAY, ctype));
if ((c.flags & Modifiers.INTERFACE) == 0)
constr.flags |= Modifiers.PRIVATE;
}
attrib.readAttributes(c, classType, CLASS_ATTR);
//System.out.println("dynamic class: " + c);
//System.out.println("statics class: " + staticsClass);
//System.out.println("module: " + c.module());
//System.out.println("modules class: " + c.module().type().symbol());
} catch (RuntimeException e) {
if (global.debug) e.printStackTrace();
String s = e.getMessage() == null ? "" : " (" +e.getMessage()+ ")";
throw new IOException("bad class file" + s);
}
}
/** convert Java modifiers into Scala flags
*/
public int transFlags(int flags) {
int res = 0;
if (((flags & 0x0007) == 0) ||
((flags & 0x0002) != 0))
res |= Modifiers.PRIVATE;
else if ((flags & 0x0004) != 0)
res |= Modifiers.PROTECTED;
if ((flags & 0x0400) != 0)
res |= Modifiers.DEFERRED;
if ((flags & 0x0010) != 0)
res |= Modifiers.FINAL;
if ((flags & 0x0200) != 0)
res |= Modifiers.INTERFACE | Modifiers.TRAIT | Modifiers.ABSTRACT;
return res | Modifiers.JAVA;
}
/** read a class name
*/
protected Name readClassName(int i) {
return (Name)pool.readPool(i);
}
/** read a class name and return the corresponding class type
*/
protected Type readClassType(int i) {
if (i == 0)
return defs.ANY_TYPE;
Type res = defs.getJavaType((Name)pool.readPool(i));
if (res == Type.ErrorType)
global.error("unknown class reference " + pool.readPool(i));
return res;
}
/** read a signature and return it as a type
*/
protected Type readType(int i) {
Name sig = pool.readExternal(i);
return sigs.sigToType(Name.names, sig.index, sig.length());
}
/** read a field
*/
protected void parseField() {
int flags = in.nextChar();
Name name = (Name)pool.readPool(in.nextChar());
Type type = readType(in.nextChar());
int mods = transFlags(flags);
if ((flags & 0x0010) == 0)
mods |= Modifiers.MUTABLE;
Symbol owner = c;
if ((flags & 0x0008) != 0)
owner = c.module().moduleClass();
Symbol s = new TermSymbol(Position.NOPOS, name, owner, mods);
s.setFirstInfo(type);
attrib.readAttributes(s, type, FIELD_ATTR);
((flags & 0x0008) != 0 ? statics : locals).enterOrOverload(s);
}
/** read a method
*/
protected void parseMethod() {
int flags = in.nextChar();
Name name = (Name)pool.readPool(in.nextChar());
Type type = readType(in.nextChar());
if (CONSTR_N.equals(name)) {
Symbol s = TermSymbol.newConstructor(c, transFlags(flags));
// kick out package visible or
// private constructors
if (((flags & 0x0002) != 0) ||
((flags & 0x0007) == 0)) {
attrib.readAttributes(s, type, METH_ATTR);
return;
}
switch (type) {
case MethodType(Symbol[] vparams, _):
type = Type.MethodType(vparams, ctype);
break;
default:
throw new ApplicationError();
}
s.setFirstInfo(type);
attrib.readAttributes(s, type, METH_ATTR);
Symbol constr = c.primaryConstructor();
if (constr.isInitialized()) constr = c.addConstructor();
s.copyTo(constr);
//System.out.println(c + " " + c.allConstructors() + ":" + c.allConstructors().info());//debug
//System.out.println("-- enter " + s);
} else {
Symbol s = new TermSymbol(
Position.NOPOS, name,
((flags & 0x0008) != 0) ? c.module().moduleClass() : c,
transFlags(flags));
s.setFirstInfo(type);
attrib.readAttributes(s, type, METH_ATTR);
((flags & 0x0008) != 0 ? statics : locals).enterOrOverload(s);
}
}
}
