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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
** **
** $Id$
\* */
package scalac.symtab.classfile;
import scala.tools.util.AbstractFile;
import scala.tools.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
| SIG_ATTR;
static final int METH_ATTR = CODE_ATTR
| EXCEPTIONS_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SIG_ATTR
| BRIDGE_ATTR;
static final int FIELD_ATTR = CONSTANT_VALUE_ATTR
| SYNTHETIC_ATTR
| DEPRECATED_ATTR
| META_ATTR
| SIG_ATTR;
protected final Global global;
protected final AbstractFileReader in;
protected final Symbol c;
protected final Symbol m;
protected final Type ctype;
protected final JavaTypeFactory make;
protected final ConstantPool pool;
protected final AttributeParser attrib;
protected final Scope locals;
protected final Scope statics;
private ClassfileParser(Global global, AbstractFileReader in, Symbol c, JavaTypeFactory make, ConstantPool pool) {
this.global = global;
this.in = in;
this.c = c;
this.m = c.linkedModule();
this.ctype = make.classType(c);
this.make = make;
this.pool = pool;
this.attrib = new AttributeParser(in, pool, this);
this.locals = new Scope();
this.statics = new Scope();
}
/** parse the classfile and throw IO exception if there is an
* error in the classfile structure
*/
public static void parse(Global global, AbstractFile file, Symbol c) throws IOException {
AbstractFileReader in = new AbstractFileReader(file);
try {
int magic = in.nextInt();
if (magic != JAVA_MAGIC)
throw new IOException("class file '" + in.path + "' "
+ "has wrong magic number 0x" + Integer.toHexString(magic)
+ ", should be 0x" + Integer.toHexString(JAVA_MAGIC));
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 '" + in.path + "' "
+ "has unknown version "
+ majorVersion + "." + minorVersion
+ ", should be less than "
+ JAVA_MAJOR_VERSION + "." + JAVA_MINOR_VERSION);
JavaTypeFactory make = new JavaTypeCreator(global.definitions);
Signatures sigs = new Signatures(global, make, in);
ConstantPool pool = new ConstantPool(in, sigs);
int flags = in.nextChar();
Symbol clasz = pool.getClass(in.nextChar());
if (c != clasz)
throw new IOException("class file '" + in.path + "' "
+ "contains wrong class " + clasz.staticType());
new ClassfileParser(global, in, c, make, pool).parse(flags);
} catch (RuntimeException e) {
if (global.debug) e.printStackTrace();
throw new IOException("class file '" + in.path + "' is broken");
}
}
protected void parse(int flags) {
{
// 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];
// set info of class
Type classInfo = Type.compoundType(basetpes, locals, c);
c.setInfo(classInfo);
// set info of statics class
Symbol staticsClass = m.moduleClass();
assert staticsClass.isModuleClass(): Debug.show(staticsClass);
Type staticsInfo = Type.compoundType(Type.EMPTY_ARRAY, statics, staticsClass);
staticsClass.setInfo(staticsInfo);
m.setInfo(make.classType(staticsClass));
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.setInfo(
Type.MethodType(Symbol.EMPTY_ARRAY, ctype));
if ((c.flags & Modifiers.INTERFACE) == 0)
constr.flags |= Modifiers.PRIVATE;
}
attrib.readAttributes(c, classInfo, CLASS_ATTR);
//System.out.println("dynamic class: " + c);
//System.out.println("statics class: " + staticsClass);
//System.out.println("module: " + m);
//System.out.println("modules class: " + m.type().symbol());
}
}
/** convert Java modifiers into Scala flags
*/
public int transFlags(int flags) {
int res = 0;
if ((flags & JAVA_ACC_PRIVATE) != 0)
res |= Modifiers.PRIVATE;
else if ((flags & JAVA_ACC_PROTECTED) != 0)
res |= Modifiers.PROTECTED;
else if ((flags & JAVA_ACC_PUBLIC) == 0)
res |= Modifiers.PRIVATE;
if ((flags & JAVA_ACC_ABSTRACT) != 0)
res |= Modifiers.DEFERRED;
if ((flags & JAVA_ACC_FINAL) != 0)
res |= Modifiers.FINAL;
if ((flags & JAVA_ACC_INTERFACE) != 0)
res |= Modifiers.INTERFACE | Modifiers.TRAIT | Modifiers.ABSTRACT;
if ((flags & JAVA_ACC_SYNTHETIC) != 0)
res |= Modifiers.SYNTHETIC;
return res | Modifiers.JAVA;
}
/** read a class name and return the corresponding class type
*/
protected Type readClassType(int i) {
return i == 0 ? make.anyType() : make.classType(pool.getClass(i));
}
/** read a field
*/
protected void parseField() {
int jflags = in.nextChar();
int sflags = transFlags(jflags);
if ((jflags & JAVA_ACC_FINAL) == 0) sflags |= Modifiers.MUTABLE;
if ((sflags & Modifiers.PRIVATE) != 0) {
in.skip(4);
attrib.skipAttributes();
} else {
Name name = pool.getName(in.nextChar());
Symbol owner = getOwner(jflags);
Symbol symbol = owner.newTerm(Position.NOPOS, sflags, name);
Type type = pool.getFieldType(in.nextChar());
symbol.setInfo(type);
attrib.readAttributes(symbol, type, FIELD_ATTR);
getScope(jflags).enterOrOverload(symbol);
}
}
/** read a method
*/
protected void parseMethod() {
int jflags = in.nextChar();
int sflags = transFlags(jflags);
if ((jflags & JAVA_ACC_BRIDGE) != 0) sflags |= Modifiers.PRIVATE;
if ((sflags & Modifiers.PRIVATE) != 0) {
in.skip(4);
attrib.skipAttributes();
} else {
Name name = pool.getName(in.nextChar());
Type type = pool.getMethodType(in.nextChar());
Symbol owner = getOwner(jflags);
Symbol symbol;
boolean newConstructor = false;
if (name == CONSTR_N) {
switch (type) {
case MethodType(Symbol[] vparams, _):
type = Type.MethodType(vparams, ctype);
break;
default:
throw Debug.abort("illegal case", type);
}
symbol = owner.primaryConstructor();
if (symbol.isInitialized()) {
symbol = owner.newConstructor(Position.NOPOS, sflags);
newConstructor = true;
} else {
symbol.flags = sflags;
}
} else {
symbol = owner.newTerm(Position.NOPOS, sflags, name);
}
setParamOwners(type, symbol);
symbol.setInfo(type);
attrib.readAttributes(symbol, type, METH_ATTR);
if (name != CONSTR_N) {
if ((symbol.flags & Modifiers.BRIDGE) == 0)
getScope(jflags).enterOrOverload(symbol);
} else if (newConstructor)
owner.addConstructor(symbol);
}
}
/** return the owner of a member with given java flags
*/
private Symbol getOwner(int jflags) {
return (jflags & JAVA_ACC_STATIC) != 0 ? m.moduleClass() : c;
}
/** return the scope of a member with given java flags
*/
private Scope getScope(int jflags) {
return (jflags & JAVA_ACC_STATIC) != 0 ? statics : locals;
}
private void setParamOwners(Type type, Symbol owner) {
switch (type) {
case PolyType(Symbol[] params, Type result):
for (int i = 0; i < params.length; i++)
params[i].setOwner(owner);
setParamOwners(result, owner);
break;
case MethodType(Symbol[] params, Type result):
for (int i = 0; i < params.length; i++) params[i].setOwner(owner);
setParamOwners(result, owner);
break;
}
}
}
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