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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scalac.atree;
import scala.tools.util.Position;
import scalac.Global;
import scalac.symtab.Definitions;
import scalac.symtab.Modifiers;
import scalac.symtab.Symbol;
import scalac.symtab.Type;
import scalac.util.Debug;
import scalac.util.Name;
/** This class implements an attributed tree typer. */
public class ATreeTyper {
//########################################################################
// Private Fields
/** The global environment */
public final Global global;
/** The global definitions */
private final Definitions definitions;
//########################################################################
// Public Constructors
/** Initializes this instance. */
public ATreeTyper(Global global, Definitions definitions) {
this.global = global;
this.definitions = definitions;
}
//########################################################################
// Public Methods - Typing code
/** Returns the types of the given codes. */
public Type[] type(ACode[] codes) {
Type[] types = new Type[codes.length];
for (int i = 0; i < types.length; i++) types[i] = type(codes[i]);
return types;
}
/** Returns the type of the given code. */
public Type type(ACode code) {
switch (code) {
case Void:
return definitions.void_TYPE();
case This(Symbol clasz):
return clasz.thisType();
case Constant(AConstant constant):
return type(constant);
case Load(ALocation location):
return type(location);
case Store(_, _):
return Type.NoType;
case Apply(AFunction function, Type[] targs, _):
return apply(type(function), targs).resultType();
case IsAs(_, Type type, boolean cast):
return cast ? type : definitions.boolean_TYPE();
case If(_, ACode success, ACode failure):
return Type.lub(new Type[]{type(success), type(failure)});
case Switch(_, _, ACode[] bodies):
return Type.lub(type(bodies));
case Synchronized(_, ACode value):
return type(value);
case Block(_, _, ACode value):
return type(value);
case Label(Symbol label, _, _):
return label.type().resultType();
case Goto(_, _):
return Type.NoType;
case Return(_, _):
return Type.NoType;
case Throw(_):
return Type.NoType;
case Drop(_, _):
return Type.NoType;
default:
throw Debug.abort("unknown case", code);
}
}
//########################################################################
// Public Methods - Typing value locations
/** Returns the type of the given value location. */
public Type type(ALocation location) {
switch (location) {
case Module(Symbol module):
return module.thisType();
case Field(Void, Symbol field, _):
return field.owner().thisType().memberStabilizedType(field);
case Field(ACode object, Symbol field, _):
return type(object).memberStabilizedType(field);
case Local(Symbol local, _):
return local.type();
case ArrayItem(ACode array, _):
return getArrayElementType(type(array));
default:
throw Debug.abort("unknown case", location);
}
}
//########################################################################
// Public Methods - Typing function references
/** Returns the type of the given function reference. */
public Type type(AFunction function) {
switch (function) {
case Method(Void, Symbol method, AInvokeStyle style):
Type type = method.owner().thisType().memberStabilizedType(method);
if (style == AInvokeStyle.New) {
assert method.isInitializer(): function;
Symbol[] tparams = method.owner().typeParams();
if (tparams.length != 0) type = Type.PolyType(tparams, type);
}
return type;
case Method(ACode object, Symbol method, _):
return type(object).memberStabilizedType(method);
case Primitive(APrimitive primitive):
return type(primitive);
case NewArray(Type element):
return definitions.array_TYPE(element);
default:
throw Debug.abort("unknown case", function);
}
}
//########################################################################
// Public Methods - Typing primitives
/** Returns the type of the given primitive. */
public Type type(APrimitive primitive) {
switch (primitive) {
case Negation(ATypeKind kind):
Type type = type(kind);
return getMethodType(type, type);
case Test(_, ATypeKind kind, true):
Type type = type(kind);
return getMethodType(type, type(ATypeKind.BOOL));
case Test(_, ATypeKind kind, false):
Type type = type(kind);
return getMethodType(type, type, type(ATypeKind.BOOL));
case Comparison(_, ATypeKind kind):
Type type = type(kind);
return getMethodType(type, type, type(ATypeKind.I4));
case Arithmetic(_, ATypeKind kind):
Type type = type(kind);
return getMethodType(type, type, type);
case Logical(_, ATypeKind kind):
Type type = type(kind);
return getMethodType(type, type, type);
case Shift(_, ATypeKind kind):
Type type = type(kind);
return getMethodType(type, type(ATypeKind.I4), type);
case Conversion(ATypeKind src, ATypeKind dst):
return getMethodType(type(src), type(dst));
case ArrayLength(ATypeKind kind):
Type type = definitions.array_TYPE(type(kind));
return getMethodType(type, type(ATypeKind.I4));
case StringConcat(ATypeKind lf, ATypeKind rg):
return getMethodType(type(lf), type(rg), type(ATypeKind.STR));
default:
throw Debug.abort("unknown case", primitive);
}
}
//########################################################################
// Public Methods - Typing constants
/** Returns the type of the given constant. */
public Type type(AConstant constant) {
Type base = basetype(constant);
if (global.currentPhase.id > global.PHASE.ERASURE.id()) return base;
return Type.ConstantType(base, constant);
}
/** Returns the base type of the given constant. */
public Type basetype(AConstant constant) {
switch (constant) {
case UNIT : return definitions.void_TYPE(); // !!! -> UNIT_TYPE()
case BOOLEAN(_): return definitions.boolean_TYPE();
case BYTE(_) : return definitions.byte_TYPE();
case SHORT(_) : return definitions.short_TYPE();
case CHAR(_) : return definitions.char_TYPE();
case INT(_) : return definitions.int_TYPE();
case LONG(_) : return definitions.long_TYPE();
case FLOAT(_) : return definitions.float_TYPE();
case DOUBLE(_) : return definitions.double_TYPE();
case STRING(_) : return definitions.STRING_TYPE();
case NULL : return definitions.ALLREF_TYPE();
case ZERO : return definitions.ALL_TYPE();
default : throw Debug.abort("unknown case", constant);
}
}
//########################################################################
// Public Methods - Typing type kinds
/** Returns the type of the given type kind. */
public Type type(ATypeKind kind) {
switch (kind) {
case UNIT: return definitions.void_TYPE(); // !!! -> UNIT_TYPE()
case BOOL: return definitions.boolean_TYPE();
// !!! case U1 : return ?;
case U2 : return definitions.char_TYPE();
// !!! case U4 : return ?;
// !!! case U8 : return ?;
case I1 : return definitions.byte_TYPE();
case I2 : return definitions.short_TYPE();
case I4 : return definitions.int_TYPE();
case I8 : return definitions.long_TYPE();
case R4 : return definitions.float_TYPE();
case R8 : return definitions.double_TYPE();
case REF : return definitions.ANYREF_TYPE();
case STR : return definitions.STRING_TYPE();
case NULL: return definitions.ALLREF_TYPE();
case ZERO: return definitions.ALL_TYPE();
default : throw Debug.abort("unknown case", kind);
}
}
//########################################################################
// Public Methods - Aliases for scala
public Type[] computeType(ACode[] codes) {
return type(codes);
}
public Type computeType(ACode code) {
return type(code);
}
public Type computeType(ALocation location) {
return type(location);
}
public Type computeType(AFunction function) {
return type(function);
}
public Type computeType(APrimitive primitive) {
return type(primitive);
}
public Type computeType(AConstant constant) {
return type(constant);
}
public Type computeType(ATypeKind kind) {
return type(kind);
}
//########################################################################
// Private Methods
/** Returns the application of given arguments to given type. */
private Type apply(Type type, Type[] targs) {
switch (type) {
case PolyType(Symbol[] tparams, Type result):
return result.subst(tparams, targs);
default:
assert targs.length == 0: type + " -- " + Debug.show(targs);
return type;
}
}
/** Returns the element type of the given array type. */
public Type getArrayElementType(Type type) { // !!! public / private
switch (type) {
case TypeRef(_, Symbol symbol, Type[] args):
assert symbol == definitions.ARRAY_CLASS && args.length == 1: type;
return args[0];
case UnboxedArrayType(Type element):
return element;
default:
throw Debug.abort("non-array type", type);
}
}
/** Returns a method type with given argument and result types. */
private Type getMethodType(Type targ1, Type result) {
return getMethodType(new Type[]{targ1}, result);
}
/** Returns a method type with given argument and result types. */
private Type getMethodType(Type targ1, Type targ2, Type result) {
return getMethodType(new Type[]{targ1, targ2}, result);
}
/** Returns a method type with given argument and result types. */
private Type getMethodType(Type[] targs, Type result) {
Symbol[] tparams = new Symbol[targs.length];
for (int i = 0; i < tparams.length; i++) {
Name name = Name.fromString("v" + i);
tparams[i] = Symbol.NONE.newTerm( // !!! should be newVParam
Position.NOPOS, Modifiers.PARAM, name);
tparams[i].setType(targs[i]);
}
return Type.MethodType(tparams, result);
}
//########################################################################
}
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