//
// expression.cs: Expression representation for the IL tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001 Ximian, Inc.
//
//
#define USE_OLD
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Diagnostics;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
///
/// This is just a helper class, it is generated by Unary, UnaryMutator
/// when an overloaded method has been found. It just emits the code for a
/// static call.
///
public class StaticCallExpr : ExpressionStatement {
ArrayList args;
MethodInfo mi;
StaticCallExpr (MethodInfo m, ArrayList a)
{
mi = m;
args = a;
type = m.ReturnType;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are born fully resolved
//
return this;
}
public override void Emit (EmitContext ec)
{
if (args != null)
Invocation.EmitArguments (ec, mi, args);
ec.ig.Emit (OpCodes.Call, mi);
return;
}
static public Expression MakeSimpleCall (EmitContext ec, MethodGroupExpr mg,
Expression e, Location loc)
{
ArrayList args;
MethodBase method;
args = new ArrayList (1);
args.Add (new Argument (e, Argument.AType.Expression));
method = Invocation.OverloadResolve (ec, (MethodGroupExpr) mg, args, loc);
if (method == null)
return null;
return new StaticCallExpr ((MethodInfo) method, args);
}
public override void EmitStatement (EmitContext ec)
{
Emit (ec);
if (type != TypeManager.void_type)
ec.ig.Emit (OpCodes.Pop);
}
}
///
/// Unary expressions.
///
///
///
/// Unary implements unary expressions. It derives from
/// ExpressionStatement becuase the pre/post increment/decrement
/// operators can be used in a statement context.
///
public class Unary : Expression {
public enum Operator : byte {
UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
Indirection, AddressOf, TOP
}
Operator oper;
Expression expr;
Location loc;
public Unary (Operator op, Expression expr, Location loc)
{
this.oper = op;
this.expr = expr;
this.loc = loc;
}
public Expression Expr {
get {
return expr;
}
set {
expr = value;
}
}
public Operator Oper {
get {
return oper;
}
set {
oper = value;
}
}
///
/// Returns a stringified representation of the Operator
///
string OperName ()
{
switch (oper){
case Operator.UnaryPlus:
return "+";
case Operator.UnaryNegation:
return "-";
case Operator.LogicalNot:
return "!";
case Operator.OnesComplement:
return "~";
case Operator.AddressOf:
return "&";
case Operator.Indirection:
return "*";
}
return oper.ToString ();
}
static string [] oper_names;
static Unary ()
{
oper_names = new string [(int)Operator.TOP];
oper_names [(int) Operator.UnaryPlus] = "op_UnaryPlus";
oper_names [(int) Operator.UnaryNegation] = "op_UnaryNegation";
oper_names [(int) Operator.LogicalNot] = "op_LogicalNot";
oper_names [(int) Operator.OnesComplement] = "op_OnesComplement";
oper_names [(int) Operator.Indirection] = "op_Indirection";
oper_names [(int) Operator.AddressOf] = "op_AddressOf";
}
void error23 (Type t)
{
Report.Error (
23, loc, "Operator " + OperName () +
" cannot be applied to operand of type `" +
TypeManager.CSharpName (t) + "'");
}
///
/// The result has been already resolved:
///
/// FIXME: a minus constant -128 sbyte cant be turned into a
/// constant byte.
///
static Expression TryReduceNegative (Expression expr)
{
Expression e = null;
if (expr is IntConstant)
e = new IntConstant (-((IntConstant) expr).Value);
else if (expr is UIntConstant)
e = new LongConstant (-((UIntConstant) expr).Value);
else if (expr is LongConstant)
e = new LongConstant (-((LongConstant) expr).Value);
else if (expr is FloatConstant)
e = new FloatConstant (-((FloatConstant) expr).Value);
else if (expr is DoubleConstant)
e = new DoubleConstant (-((DoubleConstant) expr).Value);
else if (expr is DecimalConstant)
e = new DecimalConstant (-((DecimalConstant) expr).Value);
else if (expr is ShortConstant)
e = new IntConstant (-((ShortConstant) expr).Value);
else if (expr is UShortConstant)
e = new IntConstant (-((UShortConstant) expr).Value);
return e;
}
Expression Reduce (EmitContext ec, Expression e)
{
Type expr_type = e.Type;
switch (oper){
case Operator.UnaryPlus:
return e;
case Operator.UnaryNegation:
return TryReduceNegative (e);
case Operator.LogicalNot:
if (expr_type != TypeManager.bool_type) {
error23 (expr_type);
return null;
}
BoolConstant b = (BoolConstant) e;
return new BoolConstant (!(b.Value));
case Operator.OnesComplement:
if (!((expr_type == TypeManager.int32_type) ||
(expr_type == TypeManager.uint32_type) ||
(expr_type == TypeManager.int64_type) ||
(expr_type == TypeManager.uint64_type) ||
(expr_type.IsSubclassOf (TypeManager.enum_type)))){
error23 (expr_type);
return null;
}
if (e is EnumConstant){
EnumConstant enum_constant = (EnumConstant) e;
Expression reduced = Reduce (ec, enum_constant.Child);
return new EnumConstant ((Constant) reduced, enum_constant.Type);
}
if (expr_type == TypeManager.int32_type)
return new IntConstant (~ ((IntConstant) e).Value);
if (expr_type == TypeManager.uint32_type)
return new UIntConstant (~ ((UIntConstant) e).Value);
if (expr_type == TypeManager.int64_type)
return new LongConstant (~ ((LongConstant) e).Value);
if (expr_type == TypeManager.uint64_type)
return new ULongConstant (~ ((ULongConstant) e).Value);
throw new Exception (
"FIXME: Implement constant OnesComplement of:" +
expr_type);
}
throw new Exception ("Can not constant fold");
}
Expression ResolveOperator (EmitContext ec)
{
Type expr_type = expr.Type;
//
// Step 1: Perform Operator Overload location
//
Expression mg;
string op_name;
op_name = oper_names [(int) oper];
mg = MemberLookup (ec, expr_type, op_name, false, loc);
if (mg == null && expr_type.BaseType != null)
mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
if (mg != null) {
Expression e = StaticCallExpr.MakeSimpleCall (
ec, (MethodGroupExpr) mg, expr, loc);
if (e == null){
error23 (expr_type);
return null;
}
return e;
}
// Only perform numeric promotions on:
// +, -
if (expr_type == null)
return null;
//
// Step 2: Default operations on CLI native types.
//
if (expr is Constant)
return Reduce (ec, expr);
if (oper == Operator.LogicalNot){
if (expr_type != TypeManager.bool_type) {
error23 (expr.Type);
return null;
}
type = TypeManager.bool_type;
return this;
}
if (oper == Operator.OnesComplement) {
if (!((expr_type == TypeManager.int32_type) ||
(expr_type == TypeManager.uint32_type) ||
(expr_type == TypeManager.int64_type) ||
(expr_type == TypeManager.uint64_type) ||
(expr_type.IsSubclassOf (TypeManager.enum_type)))){
error23 (expr.Type);
return null;
}
type = expr_type;
return this;
}
if (oper == Operator.UnaryPlus) {
//
// A plus in front of something is just a no-op, so return the child.
//
return expr;
}
//
// Deals with -literals
// int operator- (int x)
// long operator- (long x)
// float operator- (float f)
// double operator- (double d)
// decimal operator- (decimal d)
//
if (oper == Operator.UnaryNegation){
Expression e = null;
//
// perform numeric promotions to int,
// long, double.
//
//
// The following is inneficient, because we call
// ConvertImplicit too many times.
//
// It is also not clear if we should convert to Float
// or Double initially.
//
if (expr_type == TypeManager.uint32_type){
//
// FIXME: handle exception to this rule that
// permits the int value -2147483648 (-2^31) to
// bt wrote as a decimal interger literal
//
type = TypeManager.int64_type;
expr = ConvertImplicit (ec, expr, type, loc);
return this;
}
if (expr_type == TypeManager.uint64_type){
//
// FIXME: Handle exception of `long value'
// -92233720368547758087 (-2^63) to be wrote as
// decimal integer literal.
//
error23 (expr_type);
return null;
}
if (expr_type == TypeManager.float_type){
type = expr_type;
return this;
}
e = ConvertImplicit (ec, expr, TypeManager.int32_type, loc);
if (e != null){
expr = e;
type = e.Type;
return this;
}
e = ConvertImplicit (ec, expr, TypeManager.int64_type, loc);
if (e != null){
expr = e;
type = e.Type;
return this;
}
e = ConvertImplicit (ec, expr, TypeManager.double_type, loc);
if (e != null){
expr = e;
type = e.Type;
return this;
}
error23 (expr_type);
return null;
}
if (oper == Operator.AddressOf){
if (expr.eclass != ExprClass.Variable){
Error (211, loc, "Cannot take the address of non-variables");
return null;
}
type = Type.GetType (expr.Type.ToString () + "*");
return this;
}
Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
TypeManager.CSharpName (expr_type) + "'");
return null;
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
eclass = ExprClass.Value;
return ResolveOperator (ec);
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Type expr_type = expr.Type;
switch (oper) {
case Operator.UnaryPlus:
throw new Exception ("This should be caught by Resolve");
case Operator.UnaryNegation:
expr.Emit (ec);
ig.Emit (OpCodes.Neg);
break;
case Operator.LogicalNot:
expr.Emit (ec);
ig.Emit (OpCodes.Ldc_I4_0);
ig.Emit (OpCodes.Ceq);
break;
case Operator.OnesComplement:
expr.Emit (ec);
ig.Emit (OpCodes.Not);
break;
case Operator.AddressOf:
((IMemoryLocation)expr).AddressOf (ec);
break;
case Operator.Indirection:
throw new Exception ("Not implemented yet");
default:
throw new Exception ("This should not happen: Operator = "
+ oper.ToString ());
}
}
///
/// This will emit the child expression for `ec' avoiding the logical
/// not. The parent will take care of changing brfalse/brtrue
///
public void EmitLogicalNot (EmitContext ec)
{
if (oper != Operator.LogicalNot)
throw new Exception ("EmitLogicalNot can only be called with !expr");
expr.Emit (ec);
}
}
///
/// Unary Mutator expressions (pre and post ++ and --)
///
///
///
/// UnaryMutator implements ++ and -- expressions. It derives from
/// ExpressionStatement becuase the pre/post increment/decrement
/// operators can be used in a statement context.
///
/// FIXME: Idea, we could split this up in two classes, one simpler
/// for the common case, and one with the extra fields for more complex
/// classes (indexers require temporary access; overloaded require method)
///
/// Maybe we should have classes PreIncrement, PostIncrement, PreDecrement,
/// PostDecrement, that way we could save the `Mode' byte as well.
///
public class UnaryMutator : ExpressionStatement {
public enum Mode : byte {
PreIncrement, PreDecrement, PostIncrement, PostDecrement
}
Mode mode;
Location loc;
Expression expr;
LocalTemporary temp_storage;
//
// This is expensive for the simplest case.
//
Expression method;
public UnaryMutator (Mode m, Expression e, Location l)
{
mode = m;
loc = l;
expr = e;
}
string OperName ()
{
return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
"++" : "--";
}
void error23 (Type t)
{
Report.Error (
23, loc, "Operator " + OperName () +
" cannot be applied to operand of type `" +
TypeManager.CSharpName (t) + "'");
}
///
/// Returns whether an object of type `t' can be incremented
/// or decremented with add/sub (ie, basically whether we can
/// use pre-post incr-decr operations on it, but it is not a
/// System.Decimal, which we require operator overloading to catch)
///
static bool IsIncrementableNumber (Type t)
{
return (t == TypeManager.sbyte_type) ||
(t == TypeManager.byte_type) ||
(t == TypeManager.short_type) ||
(t == TypeManager.ushort_type) ||
(t == TypeManager.int32_type) ||
(t == TypeManager.uint32_type) ||
(t == TypeManager.int64_type) ||
(t == TypeManager.uint64_type) ||
(t == TypeManager.char_type) ||
(t.IsSubclassOf (TypeManager.enum_type)) ||
(t == TypeManager.float_type) ||
(t == TypeManager.double_type);
}
Expression ResolveOperator (EmitContext ec)
{
Type expr_type = expr.Type;
//
// Step 1: Perform Operator Overload location
//
Expression mg;
string op_name;
if (mode == Mode.PreIncrement || mode == Mode.PostIncrement)
op_name = "op_Increment";
else
op_name = "op_Decrement";
mg = MemberLookup (ec, expr_type, op_name, false, loc);
if (mg == null && expr_type.BaseType != null)
mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
if (mg != null) {
method = StaticCallExpr.MakeSimpleCall (
ec, (MethodGroupExpr) mg, expr, loc);
type = method.Type;
return this;
}
//
// The operand of the prefix/postfix increment decrement operators
// should be an expression that is classified as a variable,
// a property access or an indexer access
//
type = expr_type;
if (expr.eclass == ExprClass.Variable){
if (IsIncrementableNumber (expr_type) ||
expr_type == TypeManager.decimal_type){
return this;
}
} else if (expr.eclass == ExprClass.IndexerAccess){
IndexerAccess ia = (IndexerAccess) expr;
temp_storage = new LocalTemporary (ec, expr.Type);
expr = ia.ResolveLValue (ec, temp_storage);
if (expr == null)
return null;
return this;
} else if (expr.eclass == ExprClass.PropertyAccess){
PropertyExpr pe = (PropertyExpr) expr;
if (pe.VerifyAssignable ())
return this;
return null;
} else {
report118 (loc, expr, "variable, indexer or property access");
return null;
}
Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
TypeManager.CSharpName (expr_type) + "'");
return null;
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
eclass = ExprClass.Value;
return ResolveOperator (ec);
}
//
// FIXME: We need some way of avoiding the use of temp_storage
// for some types of storage (parameters, local variables,
// static fields) and single-dimension array access.
//
void EmitCode (EmitContext ec, bool is_expr)
{
ILGenerator ig = ec.ig;
IAssignMethod ia = (IAssignMethod) expr;
if (temp_storage == null)
temp_storage = new LocalTemporary (ec, expr.Type);
switch (mode){
case Mode.PreIncrement:
case Mode.PreDecrement:
if (method == null){
expr.Emit (ec);
ig.Emit (OpCodes.Ldc_I4_1);
if (mode == Mode.PreDecrement)
ig.Emit (OpCodes.Sub);
else
ig.Emit (OpCodes.Add);
} else
method.Emit (ec);
temp_storage.Store (ec);
ia.EmitAssign (ec, temp_storage);
if (is_expr)
temp_storage.Emit (ec);
break;
case Mode.PostIncrement:
case Mode.PostDecrement:
if (is_expr)
expr.Emit (ec);
if (method == null){
if (!is_expr)
expr.Emit (ec);
else
ig.Emit (OpCodes.Dup);
ig.Emit (OpCodes.Ldc_I4_1);
if (mode == Mode.PostDecrement)
ig.Emit (OpCodes.Sub);
else
ig.Emit (OpCodes.Add);
} else {
method.Emit (ec);
}
temp_storage.Store (ec);
ia.EmitAssign (ec, temp_storage);
break;
}
}
public override void Emit (EmitContext ec)
{
EmitCode (ec, true);
}
public override void EmitStatement (EmitContext ec)
{
EmitCode (ec, false);
}
}
///
/// Base class for the `Is' and `As' classes.
///
///
///
/// FIXME: Split this in two, and we get to save the `Operator' Oper
/// size.
///
public abstract class Probe : Expression {
public readonly string ProbeType;
protected Expression expr;
protected Type probe_type;
Location loc;
public Probe (Expression expr, string probe_type, Location l)
{
ProbeType = probe_type;
loc = l;
this.expr = expr;
}
public Expression Expr {
get {
return expr;
}
}
public override Expression DoResolve (EmitContext ec)
{
probe_type = RootContext.LookupType (ec.TypeContainer, ProbeType, false, loc);
if (probe_type == null)
return null;
expr = expr.Resolve (ec);
return this;
}
}
///
/// Implementation of the `is' operator.
///
public class Is : Probe {
public Is (Expression expr, string probe_type, Location l)
: base (expr, probe_type, l)
{
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
ig.Emit (OpCodes.Isinst, probe_type);
ig.Emit (OpCodes.Ldnull);
ig.Emit (OpCodes.Cgt_Un);
}
public override Expression DoResolve (EmitContext ec)
{
Expression e = base.DoResolve (ec);
if (e == null)
return null;
type = TypeManager.bool_type;
eclass = ExprClass.Value;
return this;
}
}
///
/// Implementation of the `as' operator.
///
public class As : Probe {
public As (Expression expr, string probe_type, Location l)
: base (expr, probe_type, l)
{
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
ig.Emit (OpCodes.Isinst, probe_type);
}
public override Expression DoResolve (EmitContext ec)
{
Expression e = base.DoResolve (ec);
if (e == null)
return null;
type = probe_type;
eclass = ExprClass.Value;
return this;
}
}
///
/// This represents a typecast in the source language.
///
/// FIXME: Cast expressions have an unusual set of parsing
/// rules, we need to figure those out.
///
public class Cast : Expression {
Expression target_type;
Expression expr;
Location loc;
public Cast (Expression cast_type, Expression expr, Location loc)
{
this.target_type = cast_type;
this.expr = expr;
this.loc = loc;
}
public Expression TargetType {
get {
return target_type;
}
}
public Expression Expr {
get {
return expr;
}
set {
expr = value;
}
}
///
/// Attempts to do a compile-time folding of a constant cast.
///
Expression TryReduce (EmitContext ec, Type target_type)
{
if (expr is ByteConstant){
byte v = ((ByteConstant) expr).Value;
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is SByteConstant){
sbyte v = ((SByteConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is ShortConstant){
short v = ((ShortConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is UShortConstant){
ushort v = ((UShortConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is IntConstant){
int v = ((IntConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is UIntConstant){
uint v = ((UIntConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is LongConstant){
long v = ((LongConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is ULongConstant){
ulong v = ((ULongConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is FloatConstant){
float v = ((FloatConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.double_type)
return new DoubleConstant ((double) v);
}
if (expr is DoubleConstant){
double v = ((DoubleConstant) expr).Value;
if (target_type == TypeManager.byte_type)
return new ByteConstant ((byte) v);
if (target_type == TypeManager.sbyte_type)
return new SByteConstant ((sbyte) v);
if (target_type == TypeManager.short_type)
return new ShortConstant ((short) v);
if (target_type == TypeManager.ushort_type)
return new UShortConstant ((ushort) v);
if (target_type == TypeManager.int32_type)
return new IntConstant ((int) v);
if (target_type == TypeManager.uint32_type)
return new UIntConstant ((uint) v);
if (target_type == TypeManager.int64_type)
return new LongConstant ((long) v);
if (target_type == TypeManager.uint64_type)
return new ULongConstant ((ulong) v);
if (target_type == TypeManager.float_type)
return new FloatConstant ((float) v);
}
return null;
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
target_type = target_type.Resolve (ec);
if (target_type == null)
return null;
if (target_type.eclass != ExprClass.Type){
report118 (loc, target_type, "class");
return null;
}
type = target_type.Type;
eclass = ExprClass.Value;
if (type == null)
return null;
if (expr is Constant){
Expression e = TryReduce (ec, type);
if (e != null)
return e;
}
expr = ConvertExplicit (ec, expr, type, loc);
return expr;
}
public override void Emit (EmitContext ec)
{
//
// This one will never happen
//
throw new Exception ("Should not happen");
}
}
///
/// Binary operators
///
public class Binary : Expression {
public enum Operator : byte {
Multiply, Division, Modulus,
Addition, Subtraction,
LeftShift, RightShift,
LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
Equality, Inequality,
BitwiseAnd,
ExclusiveOr,
BitwiseOr,
LogicalAnd,
LogicalOr
}
Operator oper;
Expression left, right;
MethodBase method;
ArrayList Arguments;
Location loc;
bool DelegateOperation;
public Binary (Operator oper, Expression left, Expression right, Location loc)
{
this.oper = oper;
this.left = left;
this.right = right;
this.loc = loc;
}
public Operator Oper {
get {
return oper;
}
set {
oper = value;
}
}
public Expression Left {
get {
return left;
}
set {
left = value;
}
}
public Expression Right {
get {
return right;
}
set {
right = value;
}
}
///
/// Returns a stringified representation of the Operator
///
string OperName ()
{
switch (oper){
case Operator.Multiply:
return "*";
case Operator.Division:
return "/";
case Operator.Modulus:
return "%";
case Operator.Addition:
return "+";
case Operator.Subtraction:
return "-";
case Operator.LeftShift:
return "<<";
case Operator.RightShift:
return ">>";
case Operator.LessThan:
return "<";
case Operator.GreaterThan:
return ">";
case Operator.LessThanOrEqual:
return "<=";
case Operator.GreaterThanOrEqual:
return ">=";
case Operator.Equality:
return "==";
case Operator.Inequality:
return "!=";
case Operator.BitwiseAnd:
return "&";
case Operator.BitwiseOr:
return "|";
case Operator.ExclusiveOr:
return "^";
case Operator.LogicalOr:
return "||";
case Operator.LogicalAnd:
return "&&";
}
return oper.ToString ();
}
Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
{
if (expr.Type == target_type)
return expr;
return ConvertImplicit (ec, expr, target_type, new Location (-1));
}
//
// Note that handling the case l == Decimal || r == Decimal
// is taken care of by the Step 1 Operator Overload resolution.
//
bool DoNumericPromotions (EmitContext ec, Type l, Type r)
{
if (l == TypeManager.double_type || r == TypeManager.double_type){
//
// If either operand is of type double, the other operand is
// conveted to type double.
//
if (r != TypeManager.double_type)
right = ConvertImplicit (ec, right, TypeManager.double_type, loc);
if (l != TypeManager.double_type)
left = ConvertImplicit (ec, left, TypeManager.double_type, loc);
type = TypeManager.double_type;
} else if (l == TypeManager.float_type || r == TypeManager.float_type){
//
// if either operand is of type float, th eother operand is
// converd to type float.
//
if (r != TypeManager.double_type)
right = ConvertImplicit (ec, right, TypeManager.float_type, loc);
if (l != TypeManager.double_type)
left = ConvertImplicit (ec, left, TypeManager.float_type, loc);
type = TypeManager.float_type;
} else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
Expression e;
Type other;
//
// If either operand is of type ulong, the other operand is
// converted to type ulong. or an error ocurrs if the other
// operand is of type sbyte, short, int or long
//
if (l == TypeManager.uint64_type){
if (r != TypeManager.uint64_type){
if (right is IntConstant){
IntConstant ic = (IntConstant) right;
e = TryImplicitIntConversion (l, ic);
if (e != null)
right = e;
} else if (right is LongConstant){
long ll = ((LongConstant) right).Value;
if (ll > 0)
right = new ULongConstant ((ulong) ll);
} else {
e = ImplicitNumericConversion (ec, right, l, loc);
if (e != null)
right = e;
}
}
other = right.Type;
} else {
if (left is IntConstant){
e = TryImplicitIntConversion (r, (IntConstant) left);
if (e != null)
left = e;
} else if (left is LongConstant){
long ll = ((LongConstant) left).Value;
if (ll > 0)
left = new ULongConstant ((ulong) ll);
} else {
e = ImplicitNumericConversion (ec, left, r, loc);
if (e != null)
left = e;
}
other = left.Type;
}
if ((other == TypeManager.sbyte_type) ||
(other == TypeManager.short_type) ||
(other == TypeManager.int32_type) ||
(other == TypeManager.int64_type)){
string oper = OperName ();
Error (34, loc, "Operator `" + OperName ()
+ "' is ambiguous on operands of type `"
+ TypeManager.CSharpName (l) + "' "
+ "and `" + TypeManager.CSharpName (r)
+ "'");
}
type = TypeManager.uint64_type;
} else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
//
// If either operand is of type long, the other operand is converted
// to type long.
//
if (l != TypeManager.int64_type)
left = ConvertImplicit (ec, left, TypeManager.int64_type, loc);
if (r != TypeManager.int64_type)
right = ConvertImplicit (ec, right, TypeManager.int64_type, loc);
type = TypeManager.int64_type;
} else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
//
// If either operand is of type uint, and the other
// operand is of type sbyte, short or int, othe operands are
// converted to type long.
//
Type other = null;
if (l == TypeManager.uint32_type)
other = r;
else if (r == TypeManager.uint32_type)
other = l;
if ((other == TypeManager.sbyte_type) ||
(other == TypeManager.short_type) ||
(other == TypeManager.int32_type)){
left = ForceConversion (ec, left, TypeManager.int64_type);
right = ForceConversion (ec, right, TypeManager.int64_type);
type = TypeManager.int64_type;
} else {
//
// if either operand is of type uint, the other
// operand is converd to type uint
//
left = ForceConversion (ec, left, TypeManager.uint32_type);
right = ForceConversion (ec, right, TypeManager.uint32_type);
type = TypeManager.uint32_type;
}
} else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
if (l != TypeManager.decimal_type)
left = ConvertImplicit (ec, left, TypeManager.decimal_type, loc);
if (r != TypeManager.decimal_type)
right = ConvertImplicit (ec, right, TypeManager.decimal_type, loc);
type = TypeManager.decimal_type;
} else {
Expression l_tmp, r_tmp;
l_tmp = ForceConversion (ec, left, TypeManager.int32_type);
if (l_tmp == null)
return false;
r_tmp = ForceConversion (ec, right, TypeManager.int32_type);
if (r_tmp == null)
return false;
left = l_tmp;
right = r_tmp;
type = TypeManager.int32_type;
}
return true;
}
void error19 ()
{
Error (19, loc,
"Operator " + OperName () + " cannot be applied to operands of type `" +
TypeManager.CSharpName (left.Type) + "' and `" +
TypeManager.CSharpName (right.Type) + "'");
}
Expression CheckShiftArguments (EmitContext ec)
{
Expression e;
Type l = left.Type;
Type r = right.Type;
e = ForceConversion (ec, right, TypeManager.int32_type);
if (e == null){
error19 ();
return null;
}
right = e;
if (((e = ConvertImplicit (ec, left, TypeManager.int32_type, loc)) != null) ||
((e = ConvertImplicit (ec, left, TypeManager.uint32_type, loc)) != null) ||
((e = ConvertImplicit (ec, left, TypeManager.int64_type, loc)) != null) ||
((e = ConvertImplicit (ec, left, TypeManager.uint64_type, loc)) != null)){
left = e;
type = e.Type;
return this;
}
error19 ();
return null;
}
Expression ResolveOperator (EmitContext ec)
{
Type l = left.Type;
Type r = right.Type;
//
// Step 1: Perform Operator Overload location
//
Expression left_expr, right_expr;
string op = "op_" + oper;
left_expr = MemberLookup (ec, l, op, false, loc);
if (left_expr == null && l.BaseType != null)
left_expr = MemberLookup (ec, l.BaseType, op, false, loc);
right_expr = MemberLookup (ec, r, op, false, loc);
if (right_expr == null && r.BaseType != null)
right_expr = MemberLookup (ec, r.BaseType, op, false, loc);
MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
if (union != null) {
Arguments = new ArrayList ();
Arguments.Add (new Argument (left, Argument.AType.Expression));
Arguments.Add (new Argument (right, Argument.AType.Expression));
method = Invocation.OverloadResolve (ec, union, Arguments, loc);
if (method != null) {
MethodInfo mi = (MethodInfo) method;
type = mi.ReturnType;
return this;
} else {
error19 ();
return null;
}
}
//
// Step 2: Default operations on CLI native types.
//
// Only perform numeric promotions on:
// +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
//
if (oper == Operator.Addition){
//
// If any of the arguments is a string, cast to string
//
if (l == TypeManager.string_type){
if (r == TypeManager.string_type){
if (left is Constant && right is Constant){
StringConstant ls = (StringConstant) left;
StringConstant rs = (StringConstant) right;
return new StringConstant (
ls.Value + rs.Value);
}
// string + string
method = TypeManager.string_concat_string_string;
} else {
// string + object
method = TypeManager.string_concat_object_object;
right = ConvertImplicit (ec, right,
TypeManager.object_type, loc);
}
type = TypeManager.string_type;
Arguments = new ArrayList ();
Arguments.Add (new Argument (left, Argument.AType.Expression));
Arguments.Add (new Argument (right, Argument.AType.Expression));
return this;
} else if (r == TypeManager.string_type){
// object + string
method = TypeManager.string_concat_object_object;
Arguments = new ArrayList ();
Arguments.Add (new Argument (left, Argument.AType.Expression));
Arguments.Add (new Argument (right, Argument.AType.Expression));
left = ConvertImplicit (ec, left, TypeManager.object_type, loc);
type = TypeManager.string_type;
return this;
}
}
if (oper == Operator.Addition || oper == Operator.Subtraction) {
if (l.IsSubclassOf (TypeManager.delegate_type) &&
r.IsSubclassOf (TypeManager.delegate_type)) {
Arguments = new ArrayList ();
Arguments.Add (new Argument (left, Argument.AType.Expression));
Arguments.Add (new Argument (right, Argument.AType.Expression));
if (oper == Operator.Addition)
method = TypeManager.delegate_combine_delegate_delegate;
else
method = TypeManager.delegate_remove_delegate_delegate;
DelegateOperation = true;
type = l;
return this;
}
}
//
// Enumeration operators
//
bool lie = TypeManager.IsEnumType (l);
bool rie = TypeManager.IsEnumType (r);
if (lie || rie){
Expression temp;
if (!rie){
temp = ConvertImplicit (ec, right, l, loc);
if (temp != null)
right = temp;
} if (!lie){
temp = ConvertImplicit (ec, left, r, loc);
if (temp != null){
left = temp;
l = r;
}
}
if (oper == Operator.Equality || oper == Operator.Inequality ||
oper == Operator.LessThanOrEqual || oper == Operator.LessThan ||
oper == Operator.GreaterThanOrEqual || oper == Operator.GreaterThan){
type = TypeManager.bool_type;
return this;
}
if (oper == Operator.BitwiseAnd ||
oper == Operator.BitwiseOr ||
oper == Operator.ExclusiveOr){
type = l;
return this;
}
}
if (oper == Operator.LeftShift || oper == Operator.RightShift)
return CheckShiftArguments (ec);
if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
if (l != TypeManager.bool_type || r != TypeManager.bool_type){
error19 ();
return null;
}
type = TypeManager.bool_type;
return this;
}
if (oper == Operator.Equality || oper == Operator.Inequality){
if (l == TypeManager.bool_type || r == TypeManager.bool_type){
if (r != TypeManager.bool_type || l != TypeManager.bool_type){
error19 ();
return null;
}
type = TypeManager.bool_type;
return this;
}
//
// operator != (object a, object b)
// operator == (object a, object b)
//
// For this to be used, both arguments have to be reference-types.
// Read the rationale on the spec (14.9.6)
//
// Also, if at compile time we know that the classes do not inherit
// one from the other, then we catch the error there.
//
if (!(l.IsValueType || r.IsValueType)){
type = TypeManager.bool_type;
if (l == r)
return this;
if (l.IsSubclassOf (r) || r.IsSubclassOf (l))
return this;
//
// We are going to have to convert to an object to compare
//
if (l != TypeManager.object_type)
left = new EmptyCast (left, TypeManager.object_type);
if (r != TypeManager.object_type)
right = new EmptyCast (right, TypeManager.object_type);
return this;
}
}
//
// We are dealing with numbers
//
if (!DoNumericPromotions (ec, l, r)){
error19 ();
return null;
}
if (left == null || right == null)
return null;
//
// reload our cached types if required
//
l = left.Type;
r = right.Type;
if (oper == Operator.BitwiseAnd ||
oper == Operator.BitwiseOr ||
oper == Operator.ExclusiveOr){
if (l == r){
if (!((l == TypeManager.int32_type) ||
(l == TypeManager.uint32_type) ||
(l == TypeManager.int64_type) ||
(l == TypeManager.uint64_type)))
type = l;
} else {
error19 ();
return null;
}
}
if (oper == Operator.Equality ||
oper == Operator.Inequality ||
oper == Operator.LessThanOrEqual ||
oper == Operator.LessThan ||
oper == Operator.GreaterThanOrEqual ||
oper == Operator.GreaterThan){
type = TypeManager.bool_type;
}
return this;
}
///
/// Constant expression reducer for binary operations
///
public Expression ConstantFold (EmitContext ec)
{
object l = ((Constant) left).GetValue ();
object r = ((Constant) right).GetValue ();
if (l is string && r is string)
return new StringConstant ((string) l + (string) r);
Type result_type = null;
//
// Enumerator folding
//
if (left.Type == right.Type && left is EnumConstant)
result_type = left.Type;
switch (oper){
case Operator.BitwiseOr:
if ((l is int) && (r is int)){
IntConstant v;
int res = (int)l | (int)r;
v = new IntConstant (res);
if (result_type == null)
return v;
else
return new EnumConstant (v, result_type);
}
break;
case Operator.BitwiseAnd:
if ((l is int) && (r is int)){
IntConstant v;
int res = (int)l & (int)r;
v = new IntConstant (res);
if (result_type == null)
return v;
else
return new EnumConstant (v, result_type);
}
break;
}
return null;
}
public override Expression DoResolve (EmitContext ec)
{
left = left.Resolve (ec);
right = right.Resolve (ec);
if (left == null || right == null)
return null;
if (left.Type == null)
throw new Exception (
"Resolve returned non null, but did not set the type! (" +
left + ") at Line: " + loc.Row);
if (right.Type == null)
throw new Exception (
"Resolve returned non null, but did not set the type! (" +
right + ") at Line: "+ loc.Row);
eclass = ExprClass.Value;
if (left is Constant && right is Constant){
//
// This is temporary until we do the full folding
//
Expression e = ConstantFold (ec);
if (e != null)
return e;
}
return ResolveOperator (ec);
}
public bool IsBranchable ()
{
if (oper == Operator.Equality ||
oper == Operator.Inequality ||
oper == Operator.LessThan ||
oper == Operator.GreaterThan ||
oper == Operator.LessThanOrEqual ||
oper == Operator.GreaterThanOrEqual){
return true;
} else
return false;
}
///
/// This entry point is used by routines that might want
/// to emit a brfalse/brtrue after an expression, and instead
/// they could use a more compact notation.
///
/// Typically the code would generate l.emit/r.emit, followed
/// by the comparission and then a brtrue/brfalse. The comparissions
/// are sometimes inneficient (there are not as complete as the branches
/// look for the hacks in Emit using double ceqs).
///
/// So for those cases we provide EmitBranchable that can emit the
/// branch with the test
///
public void EmitBranchable (EmitContext ec, int target)
{
OpCode opcode;
bool close_target = false;
ILGenerator ig = ec.ig;
//
// short-circuit operators
//
if (oper == Operator.LogicalAnd){
left.Emit (ec);
ig.Emit (OpCodes.Brfalse, target);
right.Emit (ec);
ig.Emit (OpCodes.Brfalse, target);
} else if (oper == Operator.LogicalOr){
left.Emit (ec);
ig.Emit (OpCodes.Brtrue, target);
right.Emit (ec);
ig.Emit (OpCodes.Brfalse, target);
}
left.Emit (ec);
right.Emit (ec);
switch (oper){
case Operator.Equality:
if (close_target)
opcode = OpCodes.Beq_S;
else
opcode = OpCodes.Beq;
break;
case Operator.Inequality:
if (close_target)
opcode = OpCodes.Bne_Un_S;
else
opcode = OpCodes.Bne_Un;
break;
case Operator.LessThan:
if (close_target)
opcode = OpCodes.Blt_S;
else
opcode = OpCodes.Blt;
break;
case Operator.GreaterThan:
if (close_target)
opcode = OpCodes.Bgt_S;
else
opcode = OpCodes.Bgt;
break;
case Operator.LessThanOrEqual:
if (close_target)
opcode = OpCodes.Ble_S;
else
opcode = OpCodes.Ble;
break;
case Operator.GreaterThanOrEqual:
if (close_target)
opcode = OpCodes.Bge_S;
else
opcode = OpCodes.Ble;
break;
default:
throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
+ oper.ToString ());
}
ig.Emit (opcode, target);
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Type l = left.Type;
Type r = right.Type;
OpCode opcode;
if (method != null) {
// Note that operators are static anyway
if (Arguments != null)
Invocation.EmitArguments (ec, method, Arguments);
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
if (DelegateOperation)
ig.Emit (OpCodes.Castclass, type);
return;
}
//
// Handle short-circuit operators differently
// than the rest
//
if (oper == Operator.LogicalAnd){
Label load_zero = ig.DefineLabel ();
Label end = ig.DefineLabel ();
left.Emit (ec);
ig.Emit (OpCodes.Brfalse, load_zero);
right.Emit (ec);
ig.Emit (OpCodes.Br, end);
ig.MarkLabel (load_zero);
ig.Emit (OpCodes.Ldc_I4_0);
ig.MarkLabel (end);
return;
} else if (oper == Operator.LogicalOr){
Label load_one = ig.DefineLabel ();
Label end = ig.DefineLabel ();
left.Emit (ec);
ig.Emit (OpCodes.Brtrue, load_one);
right.Emit (ec);
ig.Emit (OpCodes.Br, end);
ig.MarkLabel (load_one);
ig.Emit (OpCodes.Ldc_I4_1);
ig.MarkLabel (end);
return;
}
left.Emit (ec);
right.Emit (ec);
switch (oper){
case Operator.Multiply:
if (ec.CheckState){
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Mul_Ovf;
else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
opcode = OpCodes.Mul_Ovf_Un;
else
opcode = OpCodes.Mul;
} else
opcode = OpCodes.Mul;
break;
case Operator.Division:
if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
opcode = OpCodes.Div_Un;
else
opcode = OpCodes.Div;
break;
case Operator.Modulus:
if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
opcode = OpCodes.Rem_Un;
else
opcode = OpCodes.Rem;
break;
case Operator.Addition:
if (ec.CheckState){
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Add_Ovf;
else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
opcode = OpCodes.Add_Ovf_Un;
else
opcode = OpCodes.Mul;
} else
opcode = OpCodes.Add;
break;
case Operator.Subtraction:
if (ec.CheckState){
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Sub_Ovf;
else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
opcode = OpCodes.Sub_Ovf_Un;
else
opcode = OpCodes.Sub;
} else
opcode = OpCodes.Sub;
break;
case Operator.RightShift:
opcode = OpCodes.Shr;
break;
case Operator.LeftShift:
opcode = OpCodes.Shl;
break;
case Operator.Equality:
opcode = OpCodes.Ceq;
break;
case Operator.Inequality:
ec.ig.Emit (OpCodes.Ceq);
ec.ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.LessThan:
opcode = OpCodes.Clt;
break;
case Operator.GreaterThan:
opcode = OpCodes.Cgt;
break;
case Operator.LessThanOrEqual:
ec.ig.Emit (OpCodes.Cgt);
ec.ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.GreaterThanOrEqual:
ec.ig.Emit (OpCodes.Clt);
ec.ig.Emit (OpCodes.Ldc_I4_1);
opcode = OpCodes.Sub;
break;
case Operator.BitwiseOr:
opcode = OpCodes.Or;
break;
case Operator.BitwiseAnd:
opcode = OpCodes.And;
break;
case Operator.ExclusiveOr:
opcode = OpCodes.Xor;
break;
default:
throw new Exception ("This should not happen: Operator = "
+ oper.ToString ());
}
ig.Emit (opcode);
}
}
///
/// Implements the ternary conditiona operator (?:)
///
public class Conditional : Expression {
Expression expr, trueExpr, falseExpr;
Location loc;
public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
{
this.expr = expr;
this.trueExpr = trueExpr;
this.falseExpr = falseExpr;
this.loc = l;
}
public Expression Expr {
get {
return expr;
}
}
public Expression TrueExpr {
get {
return trueExpr;
}
}
public Expression FalseExpr {
get {
return falseExpr;
}
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr.Type != TypeManager.bool_type)
expr = Expression.ConvertImplicitRequired (
ec, expr, TypeManager.bool_type, loc);
trueExpr = trueExpr.Resolve (ec);
falseExpr = falseExpr.Resolve (ec);
if (expr == null || trueExpr == null || falseExpr == null)
return null;
if (trueExpr.Type == falseExpr.Type)
type = trueExpr.Type;
else {
Expression conv;
//
// First, if an implicit conversion exists from trueExpr
// to falseExpr, then the result type is of type falseExpr.Type
//
conv = ConvertImplicit (ec, trueExpr, falseExpr.Type, loc);
if (conv != null){
type = falseExpr.Type;
trueExpr = conv;
} else if ((conv = ConvertImplicit(ec, falseExpr,trueExpr.Type,loc))!= null){
type = trueExpr.Type;
falseExpr = conv;
} else {
Error (173, loc, "The type of the conditional expression can " +
"not be computed because there is no implicit conversion" +
" from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
" and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
return null;
}
}
if (expr is BoolConstant){
BoolConstant bc = (BoolConstant) expr;
if (bc.Value)
return trueExpr;
else
return falseExpr;
}
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Label false_target = ig.DefineLabel ();
Label end_target = ig.DefineLabel ();
expr.Emit (ec);
ig.Emit (OpCodes.Brfalse, false_target);
trueExpr.Emit (ec);
ig.Emit (OpCodes.Br, end_target);
ig.MarkLabel (false_target);
falseExpr.Emit (ec);
ig.MarkLabel (end_target);
}
}
///
/// Local variables
///
public class LocalVariableReference : Expression, IAssignMethod, IMemoryLocation {
public readonly string Name;
public readonly Block Block;
Location loc;
VariableInfo variable_info;
public LocalVariableReference (Block block, string name, Location l)
{
Block = block;
Name = name;
loc = l;
eclass = ExprClass.Variable;
}
public VariableInfo VariableInfo {
get {
if (variable_info == null)
variable_info = Block.GetVariableInfo (Name);
return variable_info;
}
}
public override Expression DoResolve (EmitContext ec)
{
VariableInfo vi = VariableInfo;
if (Block.IsConstant (Name)) {
Expression e = Block.GetConstantExpression (Name);
e = e.Resolve (ec);
if (e == null)
return null;
if (!(e is Constant)) {
Report.Error (150, loc, "A constant value is expected");
return null;
}
vi.Used = true;
return e;
}
type = vi.VariableType;
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
Expression e = DoResolve (ec);
if (e == null)
return null;
VariableInfo vi = VariableInfo;
if (vi.ReadOnly){
if (vi.Assigned){
Report.Error (
1604, loc,
"cannot assign to `" + Name + "' because it is readonly");
return null;
}
}
return this;
}
public override void Emit (EmitContext ec)
{
VariableInfo vi = VariableInfo;
ILGenerator ig = ec.ig;
int idx = vi.Idx;
vi.Used = true;
switch (idx){
case 0:
ig.Emit (OpCodes.Ldloc_0);
break;
case 1:
ig.Emit (OpCodes.Ldloc_1);
break;
case 2:
ig.Emit (OpCodes.Ldloc_2);
break;
case 3:
ig.Emit (OpCodes.Ldloc_3);
break;
default:
if (idx <= 255)
ig.Emit (OpCodes.Ldloc_S, (byte) idx);
else
ig.Emit (OpCodes.Ldloc, idx);
break;
}
}
public static void Store (ILGenerator ig, int idx)
{
switch (idx){
case 0:
ig.Emit (OpCodes.Stloc_0);
break;
case 1:
ig.Emit (OpCodes.Stloc_1);
break;
case 2:
ig.Emit (OpCodes.Stloc_2);
break;
case 3:
ig.Emit (OpCodes.Stloc_3);
break;
default:
if (idx <= 255)
ig.Emit (OpCodes.Stloc_S, (byte) idx);
else
ig.Emit (OpCodes.Stloc, idx);
break;
}
}
public void EmitAssign (EmitContext ec, Expression source)
{
ILGenerator ig = ec.ig;
VariableInfo vi = VariableInfo;
vi.Assigned = true;
source.Emit (ec);
// Funny seems the code below generates optimal code for us, but
// seems to take too long to generate what we need.
// ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
Store (ig, vi.Idx);
}
public void AddressOf (EmitContext ec)
{
VariableInfo vi = VariableInfo;
int idx = vi.Idx;
vi.Used = true;
vi.Assigned = true;
if (idx <= 255)
ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
else
ec.ig.Emit (OpCodes.Ldloca, idx);
}
}
///
/// This represents a reference to a parameter in the intermediate
/// representation.
///
public class ParameterReference : Expression, IAssignMethod, IMemoryLocation {
Parameters pars;
String name;
int idx;
bool is_ref;
public ParameterReference (Parameters pars, int idx, string name)
{
this.pars = pars;
this.idx = idx;
this.name = name;
eclass = ExprClass.Variable;
}
//
// Notice that for ref/out parameters, the type exposed is not the
// same type exposed externally.
//
// for "ref int a":
// externally we expose "int&"
// here we expose "int".
//
// We record this in "is_ref". This means that the type system can treat
// the type as it is expected, but when we generate the code, we generate
// the alternate kind of code.
//
public override Expression DoResolve (EmitContext ec)
{
type = pars.GetParameterInfo (ec.TypeContainer, idx, out is_ref);
eclass = ExprClass.Variable;
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
int arg_idx = idx;
if (!ec.IsStatic)
arg_idx++;
if (arg_idx <= 255)
ig.Emit (OpCodes.Ldarg_S, (byte) arg_idx);
else
ig.Emit (OpCodes.Ldarg, arg_idx);
if (!is_ref)
return;
//
// If we are a reference, we loaded on the stack a pointer
// Now lets load the real value
//
if (type == TypeManager.int32_type)
ig.Emit (OpCodes.Ldind_I4);
else if (type == TypeManager.uint32_type)
ig.Emit (OpCodes.Ldind_U4);
else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
ig.Emit (OpCodes.Ldind_I8);
else if (type == TypeManager.char_type)
ig.Emit (OpCodes.Ldind_U2);
else if (type == TypeManager.short_type)
ig.Emit (OpCodes.Ldind_I2);
else if (type == TypeManager.ushort_type)
ig.Emit (OpCodes.Ldind_U2);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Ldind_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Ldind_R8);
else if (type == TypeManager.byte_type)
ig.Emit (OpCodes.Ldind_U1);
else if (type == TypeManager.sbyte_type || type == TypeManager.bool_type)
ig.Emit (OpCodes.Ldind_I1);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Ldind_I);
else
ig.Emit (OpCodes.Ldind_Ref);
}
public void EmitAssign (EmitContext ec, Expression source)
{
ILGenerator ig = ec.ig;
int arg_idx = idx;
if (!ec.IsStatic)
arg_idx++;
if (is_ref){
// Load the pointer
if (arg_idx <= 255)
ig.Emit (OpCodes.Ldarg_S, (byte) arg_idx);
else
ig.Emit (OpCodes.Ldarg, arg_idx);
}
source.Emit (ec);
if (is_ref){
if (type == TypeManager.int32_type || type == TypeManager.uint32_type)
ig.Emit (OpCodes.Stind_I4);
else if (type == TypeManager.int64_type || type == TypeManager.uint64_type)
ig.Emit (OpCodes.Stind_I8);
else if (type == TypeManager.char_type || type == TypeManager.short_type ||
type == TypeManager.ushort_type)
ig.Emit (OpCodes.Stind_I2);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Stind_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Stind_R8);
else if (type == TypeManager.byte_type || type == TypeManager.sbyte_type ||
type == TypeManager.bool_type)
ig.Emit (OpCodes.Stind_I1);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Stind_I);
else
ig.Emit (OpCodes.Stind_Ref);
} else {
if (arg_idx <= 255)
ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
else
ig.Emit (OpCodes.Starg, arg_idx);
}
}
public void AddressOf (EmitContext ec)
{
int arg_idx = idx;
if (!ec.IsStatic)
arg_idx++;
if (arg_idx <= 255)
ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
else
ec.ig.Emit (OpCodes.Ldarga, arg_idx);
}
}
///
/// Used for arguments to New(), Invocation()
///
public class Argument {
public enum AType : byte {
Expression,
Ref,
Out
};
public readonly AType ArgType;
public Expression expr;
public Argument (Expression expr, AType type)
{
this.expr = expr;
this.ArgType = type;
}
public Expression Expr {
get {
return expr;
}
set {
expr = value;
}
}
public Type Type {
get {
return expr.Type;
}
}
public Parameter.Modifier GetParameterModifier ()
{
if (ArgType == AType.Ref)
return Parameter.Modifier.REF;
if (ArgType == AType.Out)
return Parameter.Modifier.OUT;
return Parameter.Modifier.NONE;
}
public static string FullDesc (Argument a)
{
return (a.ArgType == AType.Ref ? "ref " :
(a.ArgType == AType.Out ? "out " : "")) +
TypeManager.CSharpName (a.Expr.Type);
}
public bool Resolve (EmitContext ec, Location loc)
{
expr = expr.Resolve (ec);
if (ArgType == AType.Expression)
return expr != null;
if (expr.eclass != ExprClass.Variable){
Report.Error (206, loc,
"A property or indexer can not be passed as an out or ref " +
"parameter");
return false;
}
return expr != null;
}
public void Emit (EmitContext ec)
{
if (ArgType == AType.Ref || ArgType == AType.Out)
((IMemoryLocation)expr).AddressOf (ec);
else
expr.Emit (ec);
}
}
///
/// Invocation of methods or delegates.
///
public class Invocation : ExpressionStatement {
public readonly ArrayList Arguments;
Location loc;
Expression expr;
MethodBase method = null;
static Hashtable method_parameter_cache;
static Invocation ()
{
method_parameter_cache = new PtrHashtable ();
}
//
// arguments is an ArrayList, but we do not want to typecast,
// as it might be null.
//
// FIXME: only allow expr to be a method invocation or a
// delegate invocation (7.5.5)
//
public Invocation (Expression expr, ArrayList arguments, Location l)
{
this.expr = expr;
Arguments = arguments;
loc = l;
}
public Expression Expr {
get {
return expr;
}
}
///
/// Returns the Parameters (a ParameterData interface) for the
/// Method `mb'
///
public static ParameterData GetParameterData (MethodBase mb)
{
object pd = method_parameter_cache [mb];
object ip;
if (pd != null)
return (ParameterData) pd;
ip = TypeManager.LookupParametersByBuilder (mb);
if (ip != null){
method_parameter_cache [mb] = ip;
return (ParameterData) ip;
} else {
ParameterInfo [] pi = mb.GetParameters ();
ReflectionParameters rp = new ReflectionParameters (pi);
method_parameter_cache [mb] = rp;
return (ParameterData) rp;
}
}
///
/// Tells whether a user defined conversion from Type `from' to
/// Type `to' exists.
///
/// FIXME: we could implement a cache here.
///
static bool ConversionExists (EmitContext ec, Type from, Type to, Location loc)
{
// Locate user-defined implicit operators
Expression mg;
mg = MemberLookup (ec, to, "op_Implicit", false, loc);
if (mg != null) {
MethodGroupExpr me = (MethodGroupExpr) mg;
for (int i = me.Methods.Length; i > 0;) {
i--;
MethodBase mb = me.Methods [i];
ParameterData pd = GetParameterData (mb);
if (from == pd.ParameterType (0))
return true;
}
}
mg = MemberLookup (ec, from, "op_Implicit", false, loc);
if (mg != null) {
MethodGroupExpr me = (MethodGroupExpr) mg;
for (int i = me.Methods.Length; i > 0;) {
i--;
MethodBase mb = me.Methods [i];
MethodInfo mi = (MethodInfo) mb;
if (mi.ReturnType == to)
return true;
}
}
return false;
}
///
/// Determines "better conversion" as specified in 7.4.2.3
/// Returns : 1 if a->p is better
/// 0 if a->q or neither is better
///
static int BetterConversion (EmitContext ec, Argument a, Type p, Type q, Location loc)
{
Type argument_type = a.Type;
Expression argument_expr = a.Expr;
if (argument_type == null)
throw new Exception ("Expression of type " + a.Expr + " does not resolve its type");
if (p == q)
return 0;
if (argument_type == p)
return 1;
if (argument_type == q)
return 0;
//
// Now probe whether an implicit constant expression conversion
// can be used.
//
// An implicit constant expression conversion permits the following
// conversions:
//
// * A constant-expression of type `int' can be converted to type
// sbyte, byute, short, ushort, uint, ulong provided the value of
// of the expression is withing the range of the destination type.
//
// * A constant-expression of type long can be converted to type
// ulong, provided the value of the constant expression is not negative
//
// FIXME: Note that this assumes that constant folding has
// taken place. We dont do constant folding yet.
//
if (argument_expr is IntConstant){
IntConstant ei = (IntConstant) argument_expr;
int value = ei.Value;
if (p == TypeManager.sbyte_type){
if (value >= SByte.MinValue && value <= SByte.MaxValue)
return 1;
} else if (p == TypeManager.byte_type){
if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
return 1;
} else if (p == TypeManager.short_type){
if (value >= Int16.MinValue && value <= Int16.MaxValue)
return 1;
} else if (p == TypeManager.ushort_type){
if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
return 1;
} else if (p == TypeManager.uint32_type){
//
// we can optimize this case: a positive int32
// always fits on a uint32
//
if (value >= 0)
return 1;
} else if (p == TypeManager.uint64_type){
//
// we can optimize this case: a positive int32
// always fits on a uint64
//
if (value >= 0)
return 1;
}
} else if (argument_type == TypeManager.int64_type && argument_expr is LongConstant){
LongConstant lc = (LongConstant) argument_expr;
if (p == TypeManager.uint64_type){
if (lc.Value > 0)
return 1;
}
}
if (q == null) {
Expression tmp;
tmp = ConvertImplicitStandard (ec, argument_expr, p, loc);
if (tmp != null)
return 1;
else
return 0;
}
if (ConversionExists (ec, p, q, loc) == true &&
ConversionExists (ec, q, p, loc) == false)
return 1;
if (p == TypeManager.sbyte_type)
if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return 1;
if (p == TypeManager.short_type)
if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
q == TypeManager.uint64_type)
return 1;
if (p == TypeManager.int32_type)
if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
return 1;
if (p == TypeManager.int64_type)
if (q == TypeManager.uint64_type)
return 1;
return 0;
}
///
/// Determines "Better function"
///
///
/// and returns an integer indicating :
/// 0 if candidate ain't better
/// 1 if candidate is better than the current best match
///
static int BetterFunction (EmitContext ec, ArrayList args,
MethodBase candidate, MethodBase best,
bool expanded_form, Location loc)
{
ParameterData candidate_pd = GetParameterData (candidate);
ParameterData best_pd;
int argument_count;
if (args == null)
argument_count = 0;
else
argument_count = args.Count;
if (candidate_pd.Count == 0 && argument_count == 0)
return 1;
if (candidate_pd.ParameterModifier (candidate_pd.Count - 1) != Parameter.Modifier.PARAMS)
if (candidate_pd.Count != argument_count)
return 0;
if (best == null) {
int x = 0;
for (int j = argument_count; j > 0;) {
j--;
Argument a = (Argument) args [j];
Type t = candidate_pd.ParameterType (j);
if (candidate_pd.ParameterModifier (j) == Parameter.Modifier.PARAMS)
if (expanded_form)
t = t.GetElementType ();
x = BetterConversion (ec, a, t, null, loc);
if (x <= 0)
break;
}
if (x > 0)
return 1;
else
return 0;
}
best_pd = GetParameterData (best);
int rating1 = 0, rating2 = 0;
for (int j = 0; j < argument_count; ++j) {
int x, y;
Argument a = (Argument) args [j];
Type ct = candidate_pd.ParameterType (j);
Type bt = best_pd.ParameterType (j);
if (candidate_pd.ParameterModifier (j) == Parameter.Modifier.PARAMS)
if (expanded_form)
ct = ct.GetElementType ();
if (best_pd.ParameterModifier (j) == Parameter.Modifier.PARAMS)
if (expanded_form)
bt = bt.GetElementType ();
x = BetterConversion (ec, a, ct, bt, loc);
y = BetterConversion (ec, a, bt, ct, loc);
if (x < y)
break;
rating1 += x;
rating2 += y;
}
if (rating1 > rating2)
return 1;
else
return 0;
}
public static string FullMethodDesc (MethodBase mb)
{
StringBuilder sb = new StringBuilder (mb.Name);
ParameterData pd = GetParameterData (mb);
int count = pd.Count;
sb.Append (" (");
for (int i = count; i > 0; ) {
i--;
sb.Append (pd.ParameterDesc (count - i - 1));
if (i != 0)
sb.Append (", ");
}
sb.Append (")");
return sb.ToString ();
}
public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
{
MemberInfo [] miset;
MethodGroupExpr union;
if (mg1 != null && mg2 != null) {
MethodGroupExpr left_set = null, right_set = null;
int length1 = 0, length2 = 0;
left_set = (MethodGroupExpr) mg1;
length1 = left_set.Methods.Length;
right_set = (MethodGroupExpr) mg2;
length2 = right_set.Methods.Length;
ArrayList common = new ArrayList ();
for (int i = 0; i < left_set.Methods.Length; i++) {
for (int j = 0; j < right_set.Methods.Length; j++) {
if (left_set.Methods [i] == right_set.Methods [j])
common.Add (left_set.Methods [i]);
}
}
miset = new MemberInfo [length1 + length2 - common.Count];
left_set.Methods.CopyTo (miset, 0);
int k = 0;
for (int j = 0; j < right_set.Methods.Length; j++)
if (!common.Contains (right_set.Methods [j]))
miset [length1 + k++] = right_set.Methods [j];
union = new MethodGroupExpr (miset);
return union;
} else if (mg1 == null && mg2 != null) {
MethodGroupExpr me = (MethodGroupExpr) mg2;
miset = new MemberInfo [me.Methods.Length];
me.Methods.CopyTo (miset, 0);
union = new MethodGroupExpr (miset);
return union;
} else if (mg2 == null && mg1 != null) {
MethodGroupExpr me = (MethodGroupExpr) mg1;
miset = new MemberInfo [me.Methods.Length];
me.Methods.CopyTo (miset, 0);
union = new MethodGroupExpr (miset);
return union;
}
return null;
}
///
/// Determines is the candidate method, if a params method, is applicable
/// in its expanded form to the given set of arguments
///
static bool IsParamsMethodApplicable (ArrayList arguments, MethodBase candidate)
{
int arg_count;
if (arguments == null)
arg_count = 0;
else
arg_count = arguments.Count;
ParameterData pd = GetParameterData (candidate);
int pd_count = pd.Count;
if (pd_count == 0)
return false;
if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
return false;
if (pd_count - 1 > arg_count)
return false;
//
// If we have come this far, the case which remains is when the number of parameters
// is less than or equal to the argument count. So, we now check if the element type
// of the params array is compatible with each argument type
//
Type element_type = pd.ParameterType (pd_count - 1).GetElementType ();
for (int i = pd_count - 1; i < arg_count - 1; i++) {
Argument a = (Argument) arguments [i];
if (!StandardConversionExists (a.Type, element_type))
return false;
}
return true;
}
///
/// Determines if the candidate method is applicable (section 14.4.2.1)
/// to the given set of arguments
///
static bool IsApplicable (ArrayList arguments, MethodBase candidate)
{
int arg_count;
if (arguments == null)
arg_count = 0;
else
arg_count = arguments.Count;
ParameterData pd = GetParameterData (candidate);
int pd_count = pd.Count;
if (arg_count != pd.Count)
return false;
for (int i = arg_count; i > 0; ) {
i--;
Argument a = (Argument) arguments [i];
Parameter.Modifier a_mod = a.GetParameterModifier ();
Parameter.Modifier p_mod = pd.ParameterModifier (i);
if (a_mod == p_mod) {
if (a_mod == Parameter.Modifier.NONE)
if (!StandardConversionExists (a.Type, pd.ParameterType (i)))
return false;
if (a_mod == Parameter.Modifier.REF ||
a_mod == Parameter.Modifier.OUT)
if (pd.ParameterType (i) != a.Type)
return false;
} else
return false;
}
return true;
}
///
/// Find the Applicable Function Members (7.4.2.1)
///
/// me: Method Group expression with the members to select.
/// it might contain constructors or methods (or anything
/// that maps to a method).
///
/// Arguments: ArrayList containing resolved Argument objects.
///
/// loc: The location if we want an error to be reported, or a Null
/// location for "probing" purposes.
///
/// use_standard: controls whether OverloadResolve should use the
/// ConvertImplicit or ConvertImplicitStandard during overload resolution.
///
/// Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
/// that is the best match of me on Arguments.
///
///
public static MethodBase OverloadResolve (EmitContext ec, MethodGroupExpr me,
ArrayList Arguments, Location loc)
{
ArrayList afm = new ArrayList ();
int best_match_idx = -1;
MethodBase method = null;
int argument_count;
ArrayList candidates = new ArrayList ();
for (int i = me.Methods.Length; i > 0; ){
i--;
MethodBase candidate = me.Methods [i];
int x;
// Check if candidate is applicable (section 14.4.2.1)
if (!IsApplicable (Arguments, candidate))
continue;
candidates.Add (candidate);
x = BetterFunction (ec, Arguments, candidate, method, false, loc);
if (x == 0)
continue;
else {
best_match_idx = i;
method = me.Methods [best_match_idx];
}
}
if (Arguments == null)
argument_count = 0;
else
argument_count = Arguments.Count;
//
// Now we see if we can find params functions, applicable in their expanded form
// since if they were applicable in their normal form, they would have been selected
// above anyways
//
bool chose_params_expanded = false;
if (best_match_idx == -1) {
candidates = new ArrayList ();
for (int i = me.Methods.Length; i > 0; ) {
i--;
MethodBase candidate = me.Methods [i];
if (!IsParamsMethodApplicable (Arguments, candidate))
continue;
candidates.Add (candidate);
int x = BetterFunction (ec, Arguments, candidate, method, true, loc);
if (x == 0)
continue;
else {
best_match_idx = i;
method = me.Methods [best_match_idx];
chose_params_expanded = true;
}
}
}
//
// Now we see if we can at least find a method with the same number of arguments
//
ParameterData pd;
int method_count = 0;
if (best_match_idx == -1) {
for (int i = me.Methods.Length; i > 0;) {
i--;
MethodBase mb = me.Methods [i];
pd = GetParameterData (mb);
if (pd.Count == argument_count) {
best_match_idx = i;
method = me.Methods [best_match_idx];
method_count++;
} else
continue;
}
}
if (method == null)
return null;
//
// Now check that there are no ambiguities i.e the selected method
// should be better than all the others
//
for (int i = 0; i < candidates.Count; ++i) {
MethodBase candidate = (MethodBase) candidates [i];
if (candidate == method)
continue;
int x = BetterFunction (ec, Arguments, method, candidate,
chose_params_expanded, loc);
if (x != 1) {
Console.WriteLine (candidate + " " + method);
Report.Error (
121, loc,
"Ambiguous call when selecting function due to implicit casts");
return null;
}
}
// And now convert implicitly, each argument to the required type
pd = GetParameterData (method);
int pd_count = pd.Count;
for (int j = 0; j < argument_count; j++) {
Argument a = (Argument) Arguments [j];
Expression a_expr = a.Expr;
Type parameter_type = pd.ParameterType (j);
if (pd.ParameterModifier (j) == Parameter.Modifier.PARAMS && chose_params_expanded)
parameter_type = parameter_type.GetElementType ();
if (a.Type != parameter_type){
Expression conv;
conv = ConvertImplicitStandard (ec, a_expr, parameter_type, Location.Null);
if (conv == null) {
if (!Location.IsNull (loc)) {
Error (1502, loc,
"The best overloaded match for method '" +
FullMethodDesc (method) +
"' has some invalid arguments");
Error (1503, loc,
"Argument " + (j+1) +
": Cannot convert from '" + Argument.FullDesc (a)
+ "' to '" + pd.ParameterDesc (j) + "'");
}
return null;
}
//
// Update the argument with the implicit conversion
//
if (a_expr != conv)
a.Expr = conv;
// FIXME : For the case of params methods, we need to actually instantiate
// an array and initialize it with the argument values etc etc.
}
if (a.GetParameterModifier () != pd.ParameterModifier (j) &&
pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS) {
if (!Location.IsNull (loc)) {
Error (1502, loc,
"The best overloaded match for method '" + FullMethodDesc (method)+
"' has some invalid arguments");
Error (1503, loc,
"Argument " + (j+1) +
": Cannot convert from '" + Argument.FullDesc (a)
+ "' to '" + pd.ParameterDesc (j) + "'");
}
return null;
}
}
return method;
}
public override Expression DoResolve (EmitContext ec)
{
//
// First, resolve the expression that is used to
// trigger the invocation
//
expr = expr.Resolve (ec);
if (expr == null)
return null;
if (!(expr is MethodGroupExpr)) {
Type expr_type = expr.Type;
if (expr_type != null){
bool IsDelegate = TypeManager.IsDelegateType (expr_type);
if (IsDelegate)
return (new DelegateInvocation (
this.expr, Arguments, loc)).Resolve (ec);
}
}
if (!(expr is MethodGroupExpr)){
report118 (loc, this.expr, "method group");
return null;
}
//
// Next, evaluate all the expressions in the argument list
//
if (Arguments != null){
for (int i = Arguments.Count; i > 0;){
--i;
Argument a = (Argument) Arguments [i];
if (!a.Resolve (ec, loc))
return null;
}
}
method = OverloadResolve (ec, (MethodGroupExpr) this.expr, Arguments, loc);
if (method == null){
Error (-6, loc,
"Could not find any applicable function for this argument list");
return null;
}
if (method is MethodInfo)
type = ((MethodInfo)method).ReturnType;
eclass = ExprClass.Value;
return this;
}
//
// Emits the list of arguments as an array
//
static void EmitParams (EmitContext ec, int idx, ArrayList arguments)
{
ILGenerator ig = ec.ig;
int count = arguments.Count - idx;
Argument a = (Argument) arguments [idx];
Type t = a.expr.Type;
string array_type = t.FullName + "[]";
LocalBuilder array;
array = ig.DeclareLocal (Type.GetType (array_type));
IntConstant.EmitInt (ig, count);
ig.Emit (OpCodes.Newarr, t);
ig.Emit (OpCodes.Stloc, array);
int top = arguments.Count;
for (int j = idx; j < top; j++){
a = (Argument) arguments [j];
ig.Emit (OpCodes.Ldloc, array);
IntConstant.EmitInt (ig, j - idx);
a.Emit (ec);
ArrayAccess.EmitStoreOpcode (ig, t);
}
ig.Emit (OpCodes.Ldloc, array);
}
///
/// Emits a list of resolved Arguments that are in the arguments
/// ArrayList.
///
/// The MethodBase argument might be null if the
/// emission of the arguments is known not to contain
/// a `params' field (for example in constructors or other routines
/// that keep their arguments in this structure
///
public static void EmitArguments (EmitContext ec, MethodBase mb, ArrayList arguments)
{
ParameterData pd = null;
int top;
if (arguments != null)
top = arguments.Count;
else
top = 0;
if (mb != null)
pd = GetParameterData (mb);
for (int i = 0; i < top; i++){
Argument a = (Argument) arguments [i];
if (pd != null){
if (pd.ParameterModifier (i) == Parameter.Modifier.PARAMS){
EmitParams (ec, i, arguments);
return;
}
}
a.Emit (ec);
}
}
public static void EmitCall (EmitContext ec,
bool is_static, Expression instance_expr,
MethodBase method, ArrayList Arguments)
{
ILGenerator ig = ec.ig;
bool struct_call = false;
if (!is_static){
//
// If this is ourselves, push "this"
//
if (instance_expr == null){
ig.Emit (OpCodes.Ldarg_0);
} else {
//
// Push the instance expression
//
if (instance_expr.Type.IsSubclassOf (TypeManager.value_type)){
//
// Special case: calls to a function declared in a
// reference-type with a value-type argument need
// to have their value boxed.
if (method.DeclaringType.IsValueType){
struct_call = true;
//
// If the expression implements IMemoryLocation, then
// we can optimize and use AddressOf on the
// return.
//
// If not we have to use some temporary storage for
// it.
if (instance_expr is IMemoryLocation){
((IMemoryLocation)instance_expr).
AddressOf (ec);
}
else {
Type t = instance_expr.Type;
instance_expr.Emit (ec);
LocalBuilder temp = ig.DeclareLocal (t);
ig.Emit (OpCodes.Stloc, temp);
ig.Emit (OpCodes.Ldloca, temp);
}
} else {
instance_expr.Emit (ec);
ig.Emit (OpCodes.Box, instance_expr.Type);
}
} else
instance_expr.Emit (ec);
}
}
if (Arguments != null)
EmitArguments (ec, method, Arguments);
if (is_static || struct_call){
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
} else {
if (method is MethodInfo)
ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
else
ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
}
}
public override void Emit (EmitContext ec)
{
MethodGroupExpr mg = (MethodGroupExpr) this.expr;
EmitCall (ec, method.IsStatic, mg.InstanceExpression, method, Arguments);
}
public override void EmitStatement (EmitContext ec)
{
Emit (ec);
//
// Pop the return value if there is one
//
if (method is MethodInfo){
if (((MethodInfo)method).ReturnType != TypeManager.void_type)
ec.ig.Emit (OpCodes.Pop);
}
}
}
///
/// Implements the new expression
///
public class New : ExpressionStatement {
public readonly ArrayList Arguments;
public readonly string RequestedType;
Location loc;
MethodBase method = null;
//
// If set, the new expression is for a value_target, and
// we will not leave anything on the stack.
//
Expression value_target;
public New (string requested_type, ArrayList arguments, Location l)
{
RequestedType = requested_type;
Arguments = arguments;
loc = l;
}
public Expression ValueTypeVariable {
get {
return value_target;
}
set {
value_target = value;
}
}
public override Expression DoResolve (EmitContext ec)
{
type = RootContext.LookupType (ec.TypeContainer, RequestedType, false, loc);
if (type == null)
return null;
bool IsDelegate = TypeManager.IsDelegateType (type);
if (IsDelegate)
return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
bool is_struct = false;
is_struct = type.IsSubclassOf (TypeManager.value_type);
eclass = ExprClass.Value;
//
// SRE returns a match for .ctor () on structs (the object constructor),
// so we have to manually ignore it.
//
if (is_struct && Arguments == null)
return this;
Expression ml;
ml = MemberLookup (ec, type, ".ctor", false,
MemberTypes.Constructor, AllBindingFlags, loc);
if (! (ml is MethodGroupExpr)){
if (!is_struct){
report118 (loc, ml, "method group");
return null;
}
}
if (ml != null) {
if (Arguments != null){
for (int i = Arguments.Count; i > 0;){
--i;
Argument a = (Argument) Arguments [i];
if (!a.Resolve (ec, loc))
return null;
}
}
method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml,
Arguments, loc);
}
if (method == null && !is_struct) {
Error (-6, loc,
"New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
return this;
}
//
// This DoEmit can be invoked in two contexts:
// * As a mechanism that will leave a value on the stack (new object)
// * As one that wont (init struct)
//
// You can control whether a value is required on the stack by passing
// need_value_on_stack. The code *might* leave a value on the stack
// so it must be popped manually
//
// If we are dealing with a ValueType, we have a few
// situations to deal with:
//
// * The target is a ValueType, and we have been provided
// the instance (this is easy, we are being assigned).
//
// * The target of New is being passed as an argument,
// to a boxing operation or a function that takes a
// ValueType.
//
// In this case, we need to create a temporary variable
// that is the argument of New.
//
// Returns whether a value is left on the stack
//
bool DoEmit (EmitContext ec, bool need_value_on_stack)
{
if (method == null){
IMemoryLocation ml;
if (value_target == null)
value_target = new LocalTemporary (ec, type);
ml = (IMemoryLocation) value_target;
ml.AddressOf (ec);
} else {
Invocation.EmitArguments (ec, method, Arguments);
ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
return true;
}
//
// It must be a value type, sanity check
//
if (value_target != null){
ec.ig.Emit (OpCodes.Initobj, type);
if (need_value_on_stack){
value_target.Emit (ec);
return true;
}
return false;
}
throw new Exception ("No method and no value type");
}
public override void Emit (EmitContext ec)
{
DoEmit (ec, true);
}
public override void EmitStatement (EmitContext ec)
{
if (DoEmit (ec, false))
ec.ig.Emit (OpCodes.Pop);
}
}
///
/// Represents an array creation expression.
///
///
///
/// There are two possible scenarios here: one is an array creation
/// expression that specifies the dimensions and optionally the
/// initialization data and the other which does not need dimensions
/// specified but where initialization data is mandatory.
///
public class ArrayCreation : ExpressionStatement {
string RequestedType;
string Rank;
ArrayList Initializers;
Location loc;
ArrayList Arguments;
MethodBase method = null;
Type array_element_type;
bool IsOneDimensional = false;
bool IsBuiltinType = false;
bool ExpectInitializers = false;
int dimensions = 0;
Type underlying_type;
ArrayList ArrayData;
Hashtable Bounds;
public ArrayCreation (string requested_type, ArrayList exprs,
string rank, ArrayList initializers, Location l)
{
RequestedType = requested_type;
Rank = rank;
Initializers = initializers;
loc = l;
Arguments = new ArrayList ();
foreach (Expression e in exprs)
Arguments.Add (new Argument (e, Argument.AType.Expression));
}
public ArrayCreation (string requested_type, string rank, ArrayList initializers, Location l)
{
RequestedType = requested_type;
Initializers = initializers;
loc = l;
Rank = rank.Substring (0, rank.LastIndexOf ("["));
string tmp = rank.Substring (rank.LastIndexOf ("["));
dimensions = tmp.Length - 1;
ExpectInitializers = true;
}
public static string FormArrayType (string base_type, int idx_count, string rank)
{
StringBuilder sb = new StringBuilder (base_type);
sb.Append (rank);
sb.Append ("[");
for (int i = 1; i < idx_count; i++)
sb.Append (",");
sb.Append ("]");
return sb.ToString ();
}
public static string FormElementType (string base_type, int idx_count, string rank)
{
StringBuilder sb = new StringBuilder (base_type);
sb.Append ("[");
for (int i = 1; i < idx_count; i++)
sb.Append (",");
sb.Append ("]");
sb.Append (rank);
string val = sb.ToString ();
return val.Substring (0, val.LastIndexOf ("["));
}
void error178 ()
{
Report.Error (178, loc, "Incorrectly structured array initializer");
}
public bool CheckIndices (EmitContext ec, ArrayList probe, int idx, bool specified_dims)
{
if (specified_dims) {
Argument a = (Argument) Arguments [idx];
if (!a.Resolve (ec, loc))
return false;
if (!(a.Expr is Constant)) {
Report.Error (150, loc, "A constant value is expected");
return false;
}
int value = (int) ((Constant) a.Expr).GetValue ();
if (value != probe.Count) {
error178 ();
return false;
}
Bounds [idx] = value;
}
foreach (object o in probe) {
if (o is ArrayList) {
bool ret = CheckIndices (ec, (ArrayList) o, idx + 1, specified_dims);
if (!ret)
return false;
} else {
Expression tmp = (Expression) o;
tmp = tmp.Resolve (ec);
if (tmp == null)
continue;
// Handle initialization from vars, fields etc.
Expression conv = ConvertImplicitRequired (
ec, tmp, underlying_type, loc);
if (conv == null)
return false;
if (conv is StringConstant)
ArrayData.Add (conv);
else if (conv is Constant)
ArrayData.Add (((Constant) conv).GetValue ());
else
ArrayData.Add (conv);
}
}
return true;
}
public void UpdateIndices (EmitContext ec)
{
int i = 0;
for (ArrayList probe = Initializers; probe != null;) {
if (probe.Count > 0 && probe [0] is ArrayList) {
Expression e = new IntConstant (probe.Count);
Arguments.Add (new Argument (e, Argument.AType.Expression));
Bounds [i++] = probe.Count;
probe = (ArrayList) probe [0];
} else {
Expression e = new IntConstant (probe.Count);
Arguments.Add (new Argument (e, Argument.AType.Expression));
Bounds [i++] = probe.Count;
probe = null;
}
}
}
public bool ValidateInitializers (EmitContext ec)
{
if (Initializers == null) {
if (ExpectInitializers)
return false;
else
return true;
}
underlying_type = RootContext.LookupType (
ec.TypeContainer, RequestedType, false, loc);
//
// We use this to store all the date values in the order in which we
// will need to store them in the byte blob later
//
ArrayData = new ArrayList ();
Bounds = new Hashtable ();
bool ret;
if (Arguments != null) {
ret = CheckIndices (ec, Initializers, 0, true);
return ret;
} else {
Arguments = new ArrayList ();
ret = CheckIndices (ec, Initializers, 0, false);
if (!ret)
return false;
UpdateIndices (ec);
if (Arguments.Count != dimensions) {
error178 ();
return false;
}
return ret;
}
}
public override Expression DoResolve (EmitContext ec)
{
int arg_count;
if (!ValidateInitializers (ec))
return null;
if (Arguments == null)
arg_count = 0;
else {
arg_count = Arguments.Count;
for (int i = arg_count; i > 0;){
--i;
Argument a = (Argument) Arguments [i];
if (!a.Resolve (ec, loc))
return null;
}
}
string array_type = FormArrayType (RequestedType, arg_count, Rank);
string element_type = FormElementType (RequestedType, arg_count, Rank);
type = RootContext.LookupType (ec.TypeContainer, array_type, false, loc);
array_element_type = RootContext.LookupType (
ec.TypeContainer, element_type, false, loc);
if (type == null)
return null;
if (arg_count == 1) {
IsOneDimensional = true;
eclass = ExprClass.Value;
return this;
}
IsBuiltinType = TypeManager.IsBuiltinType (type);
if (IsBuiltinType) {
Expression ml;
ml = MemberLookup (ec, type, ".ctor", false, MemberTypes.Constructor,
AllBindingFlags, loc);
if (!(ml is MethodGroupExpr)){
report118 (loc, ml, "method group");
return null;
}
if (ml == null) {
Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml, Arguments, loc);
if (method == null) {
Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
eclass = ExprClass.Value;
return this;
} else {
ModuleBuilder mb = RootContext.ModuleBuilder;
ArrayList args = new ArrayList ();
if (Arguments != null){
for (int i = arg_count; i > 0;){
--i;
Argument a = (Argument) Arguments [i];
args.Add (a.Type);
}
}
Type [] arg_types = null;
if (args.Count > 0)
arg_types = new Type [args.Count];
args.CopyTo (arg_types, 0);
method = mb.GetArrayMethod (type, ".ctor", CallingConventions.HasThis, null,
arg_types);
if (method == null) {
Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
eclass = ExprClass.Value;
return this;
}
}
public static byte [] MakeByteBlob (ArrayList ArrayData, Type underlying_type, Location loc)
{
int factor;
byte [] data;
int count = ArrayData.Count;
if (underlying_type == TypeManager.int32_type ||
underlying_type == TypeManager.uint32_type ||
underlying_type == TypeManager.float_type)
factor = 4;
else if (underlying_type == TypeManager.int64_type ||
underlying_type == TypeManager.uint64_type ||
underlying_type == TypeManager.double_type)
factor = 8;
else if (underlying_type == TypeManager.byte_type ||
underlying_type == TypeManager.sbyte_type ||
underlying_type == TypeManager.bool_type)
factor = 1;
else if (underlying_type == TypeManager.short_type ||
underlying_type == TypeManager.char_type ||
underlying_type == TypeManager.ushort_type)
factor = 2;
else
return null;
data = new byte [count * factor];
int idx = 0;
for (int i = 0; i < count; ++i) {
object v = ArrayData [i];
if (v is EnumConstant)
v = ((EnumConstant) v).Child;
if (underlying_type == TypeManager.int64_type){
long val = 0;
if (!(v is Expression))
val = (long) v;
for (int j = 0; j < factor; ++j) {
data [idx + j] = (byte) (val & 0xFF);
val = (val >> 8);
}
} else if (underlying_type == TypeManager.uint64_type){
ulong val = 0;
if (!(v is Expression))
val = (ulong) v;
for (int j = 0; j < factor; ++j) {
data [idx + j] = (byte) (val & 0xFF);
val = (val >> 8);
}
} else if (underlying_type == TypeManager.float_type) {
#if __MonoCS__
#else
unsafe {
float val = 0;
if (!(v is Expression))
val = (float) v;
byte *ptr = (byte *) &val;
for (int j = 0; j < factor; ++j)
data [idx + j] = (byte) ptr [j];
}
#endif
} else if (underlying_type == TypeManager.double_type) {
#if __MonoCS__
#else
unsafe {
double val = 0;
if (!(v is Expression))
val = (double) v;
byte *ptr = (byte *) &val;
for (int j = 0; j < factor; ++j)
data [idx + j] = (byte) ptr [j];
}
#endif
} else if (underlying_type == TypeManager.char_type){
int val = (char) 0;
if (!(v is Expression))
v = (int) ((char) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
} else if (underlying_type == TypeManager.short_type){
int val = (int) 0;
if (!(v is Expression))
v = (int) ((short) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
} else if (underlying_type == TypeManager.ushort_type){
int val = (int) 0;
if (!(v is Expression))
v = (int) ((ushort) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
} else if (underlying_type == TypeManager.int32_type) {
int val = 0;
if (!(v is Expression))
val = (int) v;
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) ((val >> 8) & 0xff);
data [idx+2] = (byte) ((val >> 16) & 0xff);
data [idx+3] = (byte) (val >> 24);
} else if (underlying_type == TypeManager.uint32_type) {
uint val = 0;
if (!(v is Expression))
val = (uint) v;
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) ((val >> 8) & 0xff);
data [idx+2] = (byte) ((val >> 16) & 0xff);
data [idx+3] = (byte) (val >> 24);
} else if (underlying_type == TypeManager.sbyte_type) {
sbyte val = 0;
if (!(v is Expression))
val = (sbyte) v;
data [idx] = (byte) val;
} else if (underlying_type == TypeManager.byte_type) {
byte val = 0;
if (!(v is Expression))
val = (byte) v;
data [idx] = (byte) val;
} else
throw new Exception ("Unrecognized type in MakeByteBlob");
idx += factor;
}
return data;
}
//
// Emits the initializers for the array
//
void EmitStaticInitializers (EmitContext ec, bool is_expression)
{
//
// First, the static data
//
FieldBuilder fb;
ILGenerator ig = ec.ig;
byte [] data = MakeByteBlob (ArrayData, underlying_type, loc);
if (data != null) {
fb = RootContext.MakeStaticData (data);
if (is_expression)
ig.Emit (OpCodes.Dup);
ig.Emit (OpCodes.Ldtoken, fb);
ig.Emit (OpCodes.Call,
TypeManager.void_initializearray_array_fieldhandle);
}
}
//
// Emits pieces of the array that can not be computed at compile
// time (variables and string locations).
//
// This always expect the top value on the stack to be the array
//
void EmitDynamicInitializers (EmitContext ec, bool is_expression)
{
ILGenerator ig = ec.ig;
int dims = Bounds.Count;
int [] current_pos = new int [dims];
int top = ArrayData.Count;
LocalBuilder temp = ig.DeclareLocal (type);
ig.Emit (OpCodes.Stloc, temp);
MethodInfo set = null;
if (dims != 1){
Type [] args;
ModuleBuilder mb = null;
mb = RootContext.ModuleBuilder;
args = new Type [dims + 1];
int j;
for (j = 0; j < dims; j++)
args [j] = TypeManager.int32_type;
args [j] = array_element_type;
set = mb.GetArrayMethod (
type, "Set",
CallingConventions.HasThis | CallingConventions.Standard,
TypeManager.void_type, args);
}
for (int i = 0; i < top; i++){
Expression e = null;
if (ArrayData [i] is Expression)
e = (Expression) ArrayData [i];
if (e != null) {
//
// Basically we do this for string literals and
// other non-literal expressions
//
if (e is StringConstant || !(e is Constant)) {
ig.Emit (OpCodes.Ldloc, temp);
for (int idx = dims; idx > 0; ) {
idx--;
IntConstant.EmitInt (ig, current_pos [idx]);
}
e.Emit (ec);
if (dims == 1)
ArrayAccess.EmitStoreOpcode (ig, array_element_type);
else
ig.Emit (OpCodes.Call, set);
}
}
//
// Advance counter
//
for (int j = 0; j < dims; j++){
current_pos [j]++;
if (current_pos [j] < (int) Bounds [j])
break;
current_pos [j] = 0;
}
}
if (is_expression)
ig.Emit (OpCodes.Ldloc, temp);
}
void DoEmit (EmitContext ec, bool is_statement)
{
ILGenerator ig = ec.ig;
if (IsOneDimensional) {
Invocation.EmitArguments (ec, null, Arguments);
ig.Emit (OpCodes.Newarr, array_element_type);
} else {
Invocation.EmitArguments (ec, null, Arguments);
if (IsBuiltinType)
ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
else
ig.Emit (OpCodes.Newobj, (MethodInfo) method);
}
if (Initializers != null){
//
// FIXME: Set this variable correctly.
//
bool dynamic_initializers = true;
if (underlying_type != TypeManager.string_type &&
underlying_type != TypeManager.object_type)
EmitStaticInitializers (ec, dynamic_initializers || !is_statement);
if (dynamic_initializers)
EmitDynamicInitializers (ec, !is_statement);
}
}
public override void Emit (EmitContext ec)
{
DoEmit (ec, false);
}
public override void EmitStatement (EmitContext ec)
{
DoEmit (ec, true);
}
}
///
/// Represents the `this' construct
///
public class This : Expression, IAssignMethod, IMemoryLocation {
Location loc;
public This (Location loc)
{
this.loc = loc;
}
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
type = ec.TypeContainer.TypeBuilder;
if (ec.IsStatic){
Report.Error (26, loc,
"Keyword this not valid in static code");
return null;
}
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
DoResolve (ec);
if (ec.TypeContainer is Class){
Report.Error (1604, loc, "Cannot assign to `this'");
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
public void EmitAssign (EmitContext ec, Expression source)
{
source.Emit (ec);
ec.ig.Emit (OpCodes.Starg, 0);
}
public void AddressOf (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
// FIMXE
// FIGURE OUT WHY LDARG_S does not work
//
// consider: struct X { int val; int P { set { val = value; }}}
//
// Yes, this looks very bad. Look at `NOTAS' for
// an explanation.
// ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
}
}
///
/// Implements the typeof operator
///
public class TypeOf : Expression {
public readonly string QueriedType;
Type typearg;
Location loc;
public TypeOf (string queried_type, Location l)
{
QueriedType = queried_type;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
typearg = RootContext.LookupType (
ec.TypeContainer, QueriedType, false, loc);
if (typearg == null)
return null;
type = TypeManager.type_type;
eclass = ExprClass.Type;
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldtoken, typearg);
ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
}
}
///
/// Implements the sizeof expression
///
public class SizeOf : Expression {
public readonly string QueriedType;
public SizeOf (string queried_type)
{
this.QueriedType = queried_type;
}
public override Expression DoResolve (EmitContext ec)
{
// FIXME: Implement;
throw new Exception ("Unimplemented");
// return this;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Implement me");
}
}
///
/// Implements the member access expression
///
public class MemberAccess : Expression {
public readonly string Identifier;
Expression expr;
Expression member_lookup;
Location loc;
public MemberAccess (Expression expr, string id, Location l)
{
this.expr = expr;
Identifier = id;
loc = l;
}
public Expression Expr {
get {
return expr;
}
}
static void error176 (Location loc, string name)
{
Report.Error (176, loc, "Static member `" +
name + "' cannot be accessed " +
"with an instance reference, qualify with a " +
"type name instead");
}
#if USE_OLD
static bool IdenticalNameAndTypeName (EmitContext ec, Expression left_original, Location loc)
{
if (left_original == null)
return false;
if (!(left_original is SimpleName))
return false;
SimpleName sn = (SimpleName) left_original;
Type t = RootContext.LookupType (ec.TypeContainer, sn.Name, true, loc);
if (t != null)
return true;
return false;
}
public static Expression ResolveMemberAccess (EmitContext ec, Expression member_lookup,
Expression left, Location loc,
Expression left_original)
{
//
// Method Groups
//
if (member_lookup is MethodGroupExpr){
MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
//
// Type.MethodGroup
//
if (left is TypeExpr){
if (!mg.RemoveInstanceMethods ()){
SimpleName.Error120 (loc, mg.Methods [0].Name);
return null;
}
return member_lookup;
}
//
// Instance.MethodGroup
//
if (!mg.RemoveStaticMethods ()){
if (IdenticalNameAndTypeName (ec, left_original, loc)){
if (!mg.RemoveInstanceMethods ()){
SimpleName.Error120 (loc, mg.Methods [0].Name);
return null;
}
return member_lookup;
}
error176 (loc, mg.Methods [0].Name);
return null;
}
mg.InstanceExpression = left;
return member_lookup;
}
if (member_lookup is FieldExpr){
FieldExpr fe = (FieldExpr) member_lookup;
FieldInfo fi = fe.FieldInfo;
if (fi is FieldBuilder) {
Const c = TypeManager.LookupConstant ((FieldBuilder) fi);
if (c != null) {
object o = c.LookupConstantValue (ec);
object real_value = ((Constant) c.Expr).GetValue ();
return Constantify (real_value, fi.FieldType);
}
}
if (fi.IsLiteral) {
Type t = fi.FieldType;
Type decl_type = fi.DeclaringType;
object o;
if (fi is FieldBuilder)
o = TypeManager.GetValue ((FieldBuilder) fi);
else
o = fi.GetValue (fi);
if (decl_type.IsSubclassOf (TypeManager.enum_type)) {
Expression enum_member = MemberLookup (
ec, decl_type, "value__", false, loc);
Enum en = TypeManager.LookupEnum (decl_type);
Constant c;
if (en != null)
c = Constantify (o, en.UnderlyingType);
else
c = Constantify (o, enum_member.Type);
return new EnumConstant (c, decl_type);
}
Expression exp = Constantify (o, t);
if (!(left is TypeExpr)) {
error176 (loc, fe.FieldInfo.Name);
return null;
}
return exp;
}
if (left is TypeExpr){
// and refers to a type name or an
if (!fe.FieldInfo.IsStatic){
error176 (loc, fe.FieldInfo.Name);
return null;
}
return member_lookup;
} else {
if (fe.FieldInfo.IsStatic){
if (IdenticalNameAndTypeName (ec, left_original, loc))
return member_lookup;
error176 (loc, fe.FieldInfo.Name);
return null;
}
fe.InstanceExpression = left;
return fe;
}
}
if (member_lookup is PropertyExpr){
PropertyExpr pe = (PropertyExpr) member_lookup;
if (left is TypeExpr){
if (!pe.IsStatic){
SimpleName.Error120 (loc, pe.PropertyInfo.Name);
return null;
}
return pe;
} else {
if (pe.IsStatic){
if (IdenticalNameAndTypeName (ec, left_original, loc))
return member_lookup;
error176 (loc, pe.PropertyInfo.Name);
return null;
}
pe.InstanceExpression = left;
return pe;
}
}
if (member_lookup is EventExpr) {
EventExpr ee = (EventExpr) member_lookup;
//
// If the event is local to this class, we transform ourselves into
// a FieldExpr
//
Expression ml = MemberLookup (ec, ec.TypeContainer.TypeBuilder, ee.EventInfo.Name,
true, MemberTypes.Event, AllBindingFlags, loc);
if (ml != null) {
MemberInfo mi = ec.TypeContainer.GetFieldFromEvent ((EventExpr) ml);
if (mi == null) {
//
// If this happens, then we have an event with its own
// accessors and private field etc so there's no need
// to transform ourselves : we should instead flag an error
//
Assign.error70 (ee.EventInfo, loc);
return null;
}
ml = ExprClassFromMemberInfo (ec, mi, loc);
if (ml == null) {
Report.Error (-200, loc, "Internal error!!");
return null;
}
return ResolveMemberAccess (ec, ml, left, loc, left_original);
}
if (left is TypeExpr) {
if (!ee.IsStatic) {
SimpleName.Error120 (loc, ee.EventInfo.Name);
return null;
}
return ee;
} else {
if (ee.IsStatic) {
if (IdenticalNameAndTypeName (ec, left_original, loc))
return ee;
error176 (loc, ee.EventInfo.Name);
return null;
}
ee.InstanceExpression = left;
return ee;
}
}
if (member_lookup is TypeExpr){
member_lookup.Resolve (ec);
return member_lookup;
}
Console.WriteLine ("Left is: " + left);
Report.Error (-100, loc, "Support for [" + member_lookup + "] is not present yet");
Environment.Exit (0);
return null;
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are the sole users of ResolveWithSimpleName (ie, the only
// ones that can cope with it
//
Expression original = expr;
expr = expr.ResolveWithSimpleName (ec);
if (expr == null)
return null;
if (expr is SimpleName){
SimpleName child_expr = (SimpleName) expr;
expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
return expr.ResolveWithSimpleName (ec);
}
//
// Handle enums here when they are in transit.
// Note that we cannot afford to hit MemberLookup in this case because
// it will fail to find any members at all
//
Type expr_type = expr.Type;
if ((expr is TypeExpr) && (expr_type.IsSubclassOf (TypeManager.enum_type))){
Enum en = TypeManager.LookupEnum (expr_type);
if (en != null) {
object value = en.LookupEnumValue (ec, Identifier, loc);
if (value != null){
Constant c = Constantify (value, en.UnderlyingType);
return new EnumConstant (c, expr_type);
}
}
}
member_lookup = MemberLookup (ec, expr_type, Identifier, false, loc);
if (member_lookup == null)
return null;
return ResolveMemberAccess (ec, member_lookup, expr, loc, original);
}
#else
bla bla bla
//
// This code is more conformant to the spec (it follows it step by step),
// but it has not been tested yet, and there is nothing here that is not
// caught by the above code. But it might be a better foundation to improve
// on in the future
//
public ResolveTypeMemberAccess (EmitContext ec, Expression member_lookup,
Expression left, Location loc)
{
if (member_lookup is TypeExpr){
member_lookup.Resolve (ec);
return member_lookup;
}
if (member_lookup is MethodGroupExpr){
if (!mg.RemoveStaticMethods ()){
SimpleName.Error120 (loc, mg.Methods [0].Name);
return null;
}
return member_lookup;
}
if (member_lookup is PropertyExpr){
PropertyExpr pe = (PropertyExpr) member_lookup;
if (!pe.IsStatic){
SimpleName.Error120 (loc, pe.PropertyInfo.Name);
return null;
}
return pe;
}
if (member_lookup is FieldExpr){
FieldExpr fe = (FieldExpr) member_lookup;
FieldInfo fi = fe.FieldInfo;
if (fi is FieldBuilder) {
Const c = TypeManager.LookupConstant ((FieldBuilder) fi);
if (c != null) {
object o = c.LookupConstantValue (ec);
return Constantify (o, fi.FieldType);
}
}
if (fi.IsLiteral) {
Type t = fi.FieldType;
Type decl_type = fi.DeclaringType;
object o;
if (fi is FieldBuilder)
o = TypeManager.GetValue ((FieldBuilder) fi);
else
o = fi.GetValue (fi);
if (decl_type.IsSubclassOf (TypeManager.enum_type)) {
Expression enum_member = MemberLookup (
ec, decl_type, "value__",
false, loc);
Enum en = TypeManager.LookupEnum (decl_type);
Constant c;
if (en != null)
c = Constantify (o, en.UnderlyingType);
else
c = Constantify (o, enum_member.Type);
return new EnumConstant (c, decl_type);
}
Expression exp = Constantify (o, t);
return exp;
}
if (!fe.FieldInfo.IsStatic){
error176 (loc, fe.FieldInfo.Name);
return null;
}
return member_lookup;
}
if (member_lookup is EventExpr){
EventExpr ee = (EventExpr) member_lookup;
//
// If the event is local to this class, we transform ourselves into
// a FieldExpr
//
Expression ml = MemberLookup (
ec, ec.TypeContainer.TypeBuilder, ee.EventInfo.Name,
true, MemberTypes.Event, AllBindingFlags, loc);
if (ml != null) {
MemberInfo mi = ec.TypeContainer.GetFieldFromEvent ((EventExpr) ml);
ml = ExprClassFromMemberInfo (ec, mi, loc);
if (ml == null) {
Report.Error (-200, loc, "Internal error!!");
return null;
}
return ResolveMemberAccess (ec, ml, left, loc);
}
if (!ee.IsStatic) {
SimpleName.Error120 (loc, ee.EventInfo.Name);
return null;
}
return ee;
}
Console.WriteLine ("Left is: " + left);
Report.Error (-100, loc, "Support for [" + member_lookup + "] is not present yet");
Environment.Exit (0);
return null;
}
public ResolveInstanceMemberAccess (EmitContext ec, Expression member_lookup,
Expression left, Location loc)
{
if (member_lookup is MethodGroupExpr){
//
// Instance.MethodGroup
//
if (!mg.RemoveStaticMethods ()){
error176 (loc, mg.Methods [0].Name);
return null;
}
mg.InstanceExpression = left;
return member_lookup;
}
if (member_lookup is PropertyExpr){
PropertyExpr pe = (PropertyExpr) member_lookup;
if (pe.IsStatic){
error176 (loc, pe.PropertyInfo.Name);
return null;
}
pe.InstanceExpression = left;
return pe;
}
Type left_type = left.type;
if (left_type.IsValueType){
} else {
}
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are the sole users of ResolveWithSimpleName (ie, the only
// ones that can cope with it
//
expr = expr.ResolveWithSimpleName (ec);
if (expr == null)
return null;
if (expr is SimpleName){
SimpleName child_expr = (SimpleName) expr;
expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
return expr.ResolveWithSimpleName (ec);
}
//
// Handle enums here when they are in transit.
// Note that we cannot afford to hit MemberLookup in this case because
// it will fail to find any members at all (Why?)
//
Type expr_type = expr.Type;
if (expr_type.IsSubclassOf (TypeManager.enum_type)) {
Enum en = TypeManager.LookupEnum (expr_type);
if (en != null) {
object value = en.LookupEnumValue (ec, Identifier, loc);
if (value == null)
return null;
Constant c = Constantify (value, en.UnderlyingType);
return new EnumConstant (c, expr_type);
}
}
member_lookup = MemberLookup (ec, expr.Type, Identifier, false, loc);
if (member_lookup == null)
return null;
if (expr is TypeExpr)
return ResolveTypeMemberAccess (ec, member_lookup, expr, loc);
else
return ResolveInstanceMemberAccess (ec, member_lookup, expr, loc);
}
#endif
public override void Emit (EmitContext ec)
{
throw new Exception ("Should not happen");
}
}
///
/// Implements checked expressions
///
public class CheckedExpr : Expression {
public Expression Expr;
public CheckedExpr (Expression e)
{
Expr = e;
}
public override Expression DoResolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
bool last_check = ec.CheckState;
ec.CheckState = true;
Expr.Emit (ec);
ec.CheckState = last_check;
}
}
///
/// Implements the unchecked expression
///
public class UnCheckedExpr : Expression {
public Expression Expr;
public UnCheckedExpr (Expression e)
{
Expr = e;
}
public override Expression DoResolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
bool last_check = ec.CheckState;
ec.CheckState = false;
Expr.Emit (ec);
ec.CheckState = last_check;
}
}
///
/// An Element Access expression.
///
/// During semantic analysis these are transformed into
/// IndexerAccess or ArrayAccess
///
public class ElementAccess : Expression {
public ArrayList Arguments;
public Expression Expr;
public Location loc;
public ElementAccess (Expression e, ArrayList e_list, Location l)
{
Expr = e;
loc = l;
if (e_list == null)
return;
Arguments = new ArrayList ();
foreach (Expression tmp in e_list)
Arguments.Add (new Argument (tmp, Argument.AType.Expression));
}
bool CommonResolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
if (Expr == null)
return false;
if (Arguments == null)
return false;
for (int i = Arguments.Count; i > 0;){
--i;
Argument a = (Argument) Arguments [i];
if (!a.Resolve (ec, loc))
return false;
}
return true;
}
public override Expression DoResolve (EmitContext ec)
{
if (!CommonResolve (ec))
return null;
//
// We perform some simple tests, and then to "split" the emit and store
// code we create an instance of a different class, and return that.
//
// I am experimenting with this pattern.
//
if (Expr.Type.IsSubclassOf (TypeManager.array_type))
return (new ArrayAccess (this)).Resolve (ec);
else
return (new IndexerAccess (this)).Resolve (ec);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (!CommonResolve (ec))
return null;
if (Expr.Type.IsSubclassOf (TypeManager.array_type))
return (new ArrayAccess (this)).ResolveLValue (ec, right_side);
else
return (new IndexerAccess (this)).ResolveLValue (ec, right_side);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should never be reached");
}
}
///
/// Implements array access
///
public class ArrayAccess : Expression, IAssignMethod, IMemoryLocation {
//
// Points to our "data" repository
//
ElementAccess ea;
public ArrayAccess (ElementAccess ea_data)
{
ea = ea_data;
eclass = ExprClass.Variable;
}
public override Expression DoResolve (EmitContext ec)
{
if (ea.Expr.eclass != ExprClass.Variable) {
report118 (ea.loc, ea.Expr, "variable");
return null;
}
Type t = ea.Expr.Type;
if (t.GetArrayRank () != ea.Arguments.Count){
Report.Error (22, ea.loc,
"Incorrect number of indexes for array " +
" expected: " + t.GetArrayRank () + " got: " +
ea.Arguments.Count);
return null;
}
type = t.GetElementType ();
eclass = ExprClass.Variable;
return this;
}
///
/// Emits the right opcode to load an object of Type `t'
/// from an array of T
///
static public void EmitLoadOpcode (ILGenerator ig, Type type)
{
if (type == TypeManager.byte_type || type == TypeManager.bool_type)
ig.Emit (OpCodes.Ldelem_I1);
else if (type == TypeManager.sbyte_type)
ig.Emit (OpCodes.Ldelem_U1);
else if (type == TypeManager.short_type)
ig.Emit (OpCodes.Ldelem_I2);
else if (type == TypeManager.ushort_type)
ig.Emit (OpCodes.Ldelem_U2);
else if (type == TypeManager.int32_type)
ig.Emit (OpCodes.Ldelem_I4);
else if (type == TypeManager.uint32_type)
ig.Emit (OpCodes.Ldelem_U4);
else if (type == TypeManager.uint64_type)
ig.Emit (OpCodes.Ldelem_I8);
else if (type == TypeManager.int64_type)
ig.Emit (OpCodes.Ldelem_I8);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Ldelem_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Ldelem_R8);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Ldelem_I);
else if (type.IsValueType)
ig.Emit (OpCodes.Ldelema, type);
else
ig.Emit (OpCodes.Ldelem_Ref);
}
///
/// Emits the right opcode to store an object of Type `t'
/// from an array of T.
///
static public void EmitStoreOpcode (ILGenerator ig, Type t)
{
if (t == TypeManager.byte_type || t == TypeManager.sbyte_type ||
t == TypeManager.bool_type)
ig.Emit (OpCodes.Stelem_I1);
else if (t == TypeManager.short_type || t == TypeManager.ushort_type)
ig.Emit (OpCodes.Stelem_I2);
else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
ig.Emit (OpCodes.Stelem_I4);
else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
ig.Emit (OpCodes.Stelem_I8);
else if (t == TypeManager.float_type)
ig.Emit (OpCodes.Stelem_R4);
else if (t == TypeManager.double_type)
ig.Emit (OpCodes.Stelem_R8);
else if (t == TypeManager.intptr_type)
ig.Emit (OpCodes.Stelem_I);
else
ig.Emit (OpCodes.Stelem_Ref);
}
MethodInfo FetchGetMethod ()
{
ModuleBuilder mb = RootContext.ModuleBuilder;
Type [] args = new Type [ea.Arguments.Count];
MethodInfo get;
int i = 0;
foreach (Argument a in ea.Arguments)
args [i++] = a.Type;
get = mb.GetArrayMethod (
ea.Expr.Type, "Get",
CallingConventions.HasThis |
CallingConventions.Standard,
type, args);
return get;
}
MethodInfo FetchAddressMethod ()
{
ModuleBuilder mb = RootContext.ModuleBuilder;
Type [] args = new Type [ea.Arguments.Count];
MethodInfo address;
string ptr_type_name;
Type ret_type;
int i = 0;
ptr_type_name = type.FullName + "&";
ret_type = Type.GetType (ptr_type_name);
//
// It is a type defined by the source code we are compiling
//
if (ret_type == null){
ret_type = mb.GetType (ptr_type_name);
}
foreach (Argument a in ea.Arguments)
args [i++] = a.Type;
address = mb.GetArrayMethod (
ea.Expr.Type, "Address",
CallingConventions.HasThis |
CallingConventions.Standard,
ret_type, args);
return address;
}
public override void Emit (EmitContext ec)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
ea.Expr.Emit (ec);
foreach (Argument a in ea.Arguments)
a.Expr.Emit (ec);
if (rank == 1)
EmitLoadOpcode (ig, type);
else {
MethodInfo method;
method = FetchGetMethod ();
ig.Emit (OpCodes.Call, method);
}
}
public void EmitAssign (EmitContext ec, Expression source)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
ea.Expr.Emit (ec);
foreach (Argument a in ea.Arguments)
a.Expr.Emit (ec);
source.Emit (ec);
Type t = source.Type;
if (rank == 1)
EmitStoreOpcode (ig, t);
else {
ModuleBuilder mb = RootContext.ModuleBuilder;
Type [] args = new Type [ea.Arguments.Count + 1];
MethodInfo set;
int i = 0;
foreach (Argument a in ea.Arguments)
args [i++] = a.Type;
args [i] = type;
set = mb.GetArrayMethod (
ea.Expr.Type, "Set",
CallingConventions.HasThis |
CallingConventions.Standard,
TypeManager.void_type, args);
ig.Emit (OpCodes.Call, set);
}
}
public void AddressOf (EmitContext ec)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
ea.Expr.Emit (ec);
foreach (Argument a in ea.Arguments)
a.Expr.Emit (ec);
if (rank == 1){
ig.Emit (OpCodes.Ldelema, type);
} else {
MethodInfo address = FetchAddressMethod ();
ig.Emit (OpCodes.Call, address);
}
}
}
class Indexers {
public ArrayList getters, setters;
static Hashtable map;
static Indexers ()
{
map = new Hashtable ();
}
Indexers (MemberInfo [] mi)
{
foreach (PropertyInfo property in mi){
MethodInfo get, set;
get = property.GetGetMethod (true);
if (get != null){
if (getters == null)
getters = new ArrayList ();
getters.Add (get);
}
set = property.GetSetMethod (true);
if (set != null){
if (setters == null)
setters = new ArrayList ();
setters.Add (set);
}
}
}
static public Indexers GetIndexersForType (Type t, TypeManager tm, Location loc)
{
Indexers ix = (Indexers) map [t];
string p_name = TypeManager.IndexerPropertyName (t);
if (ix != null)
return ix;
MemberInfo [] mi = tm.FindMembers (
t, MemberTypes.Property,
BindingFlags.Public | BindingFlags.Instance,
Type.FilterName, p_name);
if (mi == null || mi.Length == 0){
Report.Error (21, loc,
"Type `" + TypeManager.CSharpName (t) + "' does not have " +
"any indexers defined");
return null;
}
ix = new Indexers (mi);
map [t] = ix;
return ix;
}
}
///
/// Expressions that represent an indexer call.
///
public class IndexerAccess : Expression, IAssignMethod {
//
// Points to our "data" repository
//
ElementAccess ea;
MethodInfo get, set;
Indexers ilist;
ArrayList set_arguments;
public IndexerAccess (ElementAccess ea_data)
{
ea = ea_data;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
Type indexer_type = ea.Expr.Type;
//
// Step 1: Query for all `Item' *properties*. Notice
// that the actual methods are pointed from here.
//
// This is a group of properties, piles of them.
if (ilist == null)
ilist = Indexers.GetIndexersForType (
indexer_type, RootContext.TypeManager, ea.loc);
//
// Step 2: find the proper match
//
if (ilist != null && ilist.getters != null && ilist.getters.Count > 0)
get = (MethodInfo) Invocation.OverloadResolve (
ec, new MethodGroupExpr (ilist.getters), ea.Arguments, ea.loc);
if (get == null){
Report.Error (154, ea.loc,
"indexer can not be used in this context, because " +
"it lacks a `get' accessor");
return null;
}
type = get.ReturnType;
eclass = ExprClass.IndexerAccess;
return this;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
Type indexer_type = ea.Expr.Type;
Type right_type = right_side.Type;
if (ilist == null)
ilist = Indexers.GetIndexersForType (
indexer_type, RootContext.TypeManager, ea.loc);
if (ilist != null && ilist.setters != null && ilist.setters.Count > 0){
set_arguments = (ArrayList) ea.Arguments.Clone ();
set_arguments.Add (new Argument (right_side, Argument.AType.Expression));
set = (MethodInfo) Invocation.OverloadResolve (
ec, new MethodGroupExpr (ilist.setters), set_arguments, ea.loc);
}
if (set == null){
Report.Error (200, ea.loc,
"indexer X.this [" + TypeManager.CSharpName (right_type) +
"] lacks a `set' accessor");
return null;
}
type = TypeManager.void_type;
eclass = ExprClass.IndexerAccess;
return this;
}
public override void Emit (EmitContext ec)
{
Invocation.EmitCall (ec, false, ea.Expr, get, ea.Arguments);
}
//
// source is ignored, because we already have a copy of it from the
// LValue resolution and we have already constructed a pre-cached
// version of the arguments (ea.set_arguments);
//
public void EmitAssign (EmitContext ec, Expression source)
{
Invocation.EmitCall (ec, false, ea.Expr, set, set_arguments);
}
}
///
/// The base operator for method names
///
public class BaseAccess : Expression {
string member;
Location loc;
public BaseAccess (string member, Location l)
{
this.member = member;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
Expression member_lookup;
Type current_type = ec.TypeContainer.TypeBuilder;
Type base_type = current_type.BaseType;
member_lookup = MemberLookup (ec, base_type, member, false, loc);
if (member_lookup == null)
return null;
Expression left;
if (ec.IsStatic)
left = new TypeExpr (base_type);
else
left = new This (loc).Resolve (ec);
return MemberAccess.ResolveMemberAccess (ec, member_lookup, left, loc, null);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
}
///
/// The base indexer operator
///
public class BaseIndexerAccess : Expression {
ArrayList Arguments;
public BaseIndexerAccess (ArrayList args)
{
Arguments = args;
}
public override Expression DoResolve (EmitContext ec)
{
// FIXME: Implement;
throw new Exception ("Unimplemented");
// return this;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Unimplemented");
}
}
///
/// This class exists solely to pass the Type around and to be a dummy
/// that can be passed to the conversion functions (this is used by
/// foreach implementation to typecast the object return value from
/// get_Current into the proper type. All code has been generated and
/// we only care about the side effect conversions to be performed
///
public class EmptyExpression : Expression {
public EmptyExpression ()
{
type = TypeManager.object_type;
eclass = ExprClass.Value;
}
public EmptyExpression (Type t)
{
type = t;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
// nothing, as we only exist to not do anything.
}
//
// This is just because we might want to reuse this bad boy
// instead of creating gazillions of EmptyExpressions.
// (CanConvertImplicit uses it)
//
public void SetType (Type t)
{
type = t;
}
}
public class UserCast : Expression {
MethodBase method;
Expression source;
public UserCast (MethodInfo method, Expression source)
{
this.method = method;
this.source = source;
type = method.ReturnType;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are born fully resolved
//
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
source.Emit (ec);
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
}
}
//
// This class is used to "construct" the type during a typecast
// operation. Since the Type.GetType class in .NET can parse
// the type specification, we just use this to construct the type
// one bit at a time.
//
public class ComposedCast : Expression {
Expression left;
string dim;
Location loc;
public ComposedCast (Expression left, string dim, Location l)
{
this.left = left;
this.dim = dim;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
left = left.Resolve (ec);
if (left == null)
return null;
if (left.eclass != ExprClass.Type){
report118 (loc, left, "type");
return null;
}
type = RootContext.LookupType (
ec.TypeContainer, left.Type.FullName + dim, false, loc);
if (type == null)
return null;
eclass = ExprClass.Type;
return this;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("This should never be called");
}
}
}