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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.symtab.classfile;
import ch.epfl.lamp.util.Position;
import scalac.Global;
import scalac.symtab.Symbol;
import scalac.symtab.Type;
import scalac.util.AbstractFileReader;
import scalac.util.Name;
import scalac.util.SourceRepresentation;
/** This class implements the parsing of class file signatures. */
public class Signatures {
//########################################################################
// Private Fields
/** The global environment */
private final Global global;
/** The Java type factory */
private final JavaTypeFactory make;
/** The input file */
private final AbstractFileReader in;
/** The address of the first byte of the current signature */
private int first;
/** The address of the last byte of the current signature */
private int last;
/** The current address (first <= current <= last) */
private int current;
//########################################################################
// Public Constructors
/** Initializes this instance. */
public Signatures(Global global, JavaTypeFactory make,
AbstractFileReader in)
{
this.global = global;
this.make = make;
this.in = in;
}
//########################################################################
// Public Methods
/**
* Sets the address of the next signature to read. The address
* must point to the first byte of a CONSTANT_Utf8_info.
*/
public Signatures at(int address) {
first = address + 3;
last = first + in.getChar(address + 1) - 1;
current = first;
return this;
}
/** Returns the current signature. */
public String getSignature() {
return SourceRepresentation.ascii2string(in.buf, first, last-first+1);
}
/** Reads the class signature at current address. */
public Symbol readClassName() {
Symbol owner = global.definitions.ROOT_CLASS;
int start = current;
for (; current <= last; current++) {
int b = in.byteAt(current);
if (b == ';') break;
if (b != '/') continue;
Name name = Name.fromAscii(in.buf, start, current - start);
Symbol module = owner.members().lookup(name);
if (!module.isModule()) {
Symbol symbol = owner.newModule(Position.NOPOS, 0, name);
symbol.moduleClass().setInfo(Type.ErrorType);
error("could not find module " + symbol.staticType());
if (module.isNone()) owner.members().enterNoHide(symbol);
module = symbol;
}
owner = module.moduleClass();
start = current + 1;
}
Name name = Name.fromAscii(in.buf, start, current-start).toTypeName();
Symbol clasz = owner.members().lookup(name);
if (!clasz.isClass()) {
Symbol symbol = owner.newClass(Position.NOPOS, 0, name);
symbol.setInfo(Type.ErrorType);
symbol.allConstructors().setInfo(Type.ErrorType);
error("could not find class " + symbol.staticType());
if (clasz.isNone()) owner.members().enterNoHide(symbol);
clasz = symbol;
}
current++;
return clasz;
}
/** Reads the value type signature at current address. */
public Type readValueType() {
switch (in.byteAt(current++)) {
case 'V': return make.voidType();
case 'Z': return make.booleanType();
case 'B': return make.byteType();
case 'S': return make.shortType();
case 'C': return make.charType();
case 'I': return make.intType();
case 'J': return make.longType();
case 'F': return make.floatType();
case 'D': return make.doubleType();
case 'L': return make.classType(readClassName());
case '[': return make.arrayType(readValueType());
default : return errorBadTypeTag(current - 1);
}
}
/** Reads the method type signature at current address. */
public Type readMethodType() {
if (in.byteAt(current++) != '(') return errorBadTypeTag(current - 1);
Type[] parameters = readParamterTypes(0);
Type result = readValueType();
return make.methodType(parameters, result, Type.EMPTY_ARRAY);
}
//########################################################################
// Private Methods
/** Reads the parameter types at current address. */
private Type[] readParamterTypes(int i) {
if (in.byteAt(current) == ')') {
current++;
return new Type[i];
} else {
Type type = readValueType();
Type[] types = readParamterTypes(i + 1);
types[i] = type;
return types;
}
}
/** Signals a bad tag at given address. Return ErrorType. */
private Type errorBadTypeTag(int address) {
char tag = (char)in.byteAt(address);
error("bad tag '" + tag + "' in signature '" + getSignature() + "'");
return Type.ErrorType;
}
/** Signals the given error. */
private void error(String error) {
global.error("class file '" + in.path + "': " + error);
}
//########################################################################
}
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