// Author:
// Miguel de Icaza (miguel@ximian.com)
// Martin Baulig (martin@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
// (C) 2003, 2004 Novell, Inc.
Type t = expr.Type;
if ((t != TypeManager.exception_type) &&
- !t.IsSubclassOf (TypeManager.exception_type) &&
- !(expr is NullLiteral)) {
+ !TypeManager.IsSubclassOf (t, TypeManager.exception_type) &&
+ !(expr is NullLiteral)) {
Error (155,
"The type caught or thrown must be derived " +
"from System.Exception");
}
}
+ public abstract class Variable
+ {
+ public abstract Type Type {
+ get;
+ }
+
+ public abstract bool HasInstance {
+ get;
+ }
+
+ public abstract bool NeedsTemporary {
+ get;
+ }
+
+ public abstract void EmitInstance (EmitContext ec);
+
+ public abstract void Emit (EmitContext ec);
+
+ public abstract void EmitAssign (EmitContext ec);
+
+ public abstract void EmitAddressOf (EmitContext ec);
+ }
+
//
// The information about a user-perceived local variable
//
public class LocalInfo {
public Expression Type;
- //
- // Most of the time a variable will be stored in a LocalBuilder
- //
- // But sometimes, it will be stored in a field (variables that have been
- // hoisted by iterators or by anonymous methods). The context of the field will
- // be stored in the EmitContext
- //
- //
- public LocalBuilder LocalBuilder;
- public FieldBuilder FieldBuilder;
-
public Type VariableType;
public readonly string Name;
public readonly Location Location;
public VariableInfo VariableInfo;
+ Variable var;
+ public Variable Variable {
+ get { return var; }
+ }
+
[Flags]
enum Flags : byte {
Used = 1,
Flags flags;
ReadOnlyContext ro_context;
+ LocalBuilder builder;
public LocalInfo (Expression type, string name, Block block, Location l)
{
public LocalInfo (DeclSpace ds, Block block, Location l)
{
- VariableType = ds.TypeBuilder;
+ VariableType = ds.IsGeneric ? ds.CurrentType : ds.TypeBuilder;
Block = block;
Location = l;
}
- public void DeclareLocal (ILGenerator ig)
+ public void ResolveVariable (EmitContext ec)
{
- if (Pinned) {
- //
- // This is needed to compile on both .NET 1.x and .NET 2.x
- // the later introduced `DeclareLocal (Type t, bool pinned)'
- //
- LocalBuilder = TypeManager.DeclareLocalPinned (ig, VariableType);
- return;
+ Block theblock = Block;
+ if (theblock.ScopeInfo != null)
+ var = theblock.ScopeInfo.GetCapturedVariable (this);
+
+ if (var == null) {
+ if (Pinned)
+ //
+ // This is needed to compile on both .NET 1.x and .NET 2.x
+ // the later introduced `DeclareLocal (Type t, bool pinned)'
+ //
+ builder = TypeManager.DeclareLocalPinned (ec.ig, VariableType);
+ else
+ builder = ec.ig.DeclareLocal (VariableType);
+
+ var = new LocalVariable (this, builder);
}
- if (!IsThis && !IsConstant)
- LocalBuilder = ig.DeclareLocal (VariableType);
+ }
+
+ public void EmitSymbolInfo (EmitContext ec, string name)
+ {
+ if (builder != null)
+ ec.DefineLocalVariable (name, builder);
}
public bool IsThisAssigned (EmitContext ec, Location loc)
flags = value ? (flags | Flags.IsThis) : (flags & ~Flags.IsThis);
}
}
+
+ protected class LocalVariable : Variable
+ {
+ public readonly LocalInfo LocalInfo;
+ LocalBuilder builder;
+
+ public LocalVariable (LocalInfo local, LocalBuilder builder)
+ {
+ this.LocalInfo = local;
+ this.builder = builder;
+ }
+
+ public override Type Type {
+ get { return LocalInfo.VariableType; }
+ }
+
+ public override bool HasInstance {
+ get { return false; }
+ }
+
+ public override bool NeedsTemporary {
+ get { return false; }
+ }
+
+ public override void EmitInstance (EmitContext ec)
+ {
+ // Do nothing.
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldloc, builder);
+ }
+
+ public override void EmitAssign (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Stloc, builder);
+ }
+
+ public override void EmitAddressOf (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldloca, builder);
+ }
+ }
}
/// <summary>
IsDestructor = 32,
IsToplevel = 64,
Unsafe = 128,
- HasVarargs = 256 // Used in ToplevelBlock
+ HasVarargs = 256, // Used in ToplevelBlock
+ IsIterator = 512
+
}
protected Flags flags;
//
// The statements in this block
//
- ArrayList statements;
+ protected ArrayList statements;
int num_statements;
//
//
Block switch_block;
+ ExpressionStatement scope_init;
+
+ ArrayList anonymous_children;
+
protected static int id;
int this_id;
get { return this_id; }
}
- protected IDictionary Variables {
+ public IDictionary Variables {
get {
if (variables == null)
variables = new ListDictionary ();
EndLocation = loc;
}
+ protected static void Error_158 (string name, Location loc)
+ {
+ Report.Error (158, loc, "The label `{0}' shadows another label " +
+ "by the same name in a contained scope.", name);
+ }
+
/// <summary>
/// Adds a label to the current block.
/// </summary>
Block cur = this;
while (cur != null) {
if (cur.DoLookupLabel (name) != null) {
- Report.Error (140, target.loc, "The label `{0}' is a duplicate", name);
+ Report.Error (140, target.loc,
+ "The label `{0}' is a duplicate", name);
return false;
}
while (cur != null) {
if (cur.DoLookupLabel (name) != null) {
- Report.Error (
- 158, target.loc,
- "The label `{0}' shadows another label by the same name in a contained scope.",
- name);
+ Error_158 (name, target.loc);
return false;
}
if (s == null)
continue;
- Report.Error (
- 158, s.loc,
- "The label `{0}' shadows another label by the same name in a contained scope.",
- name);
+ Error_158 (name, target.loc);
return false;
}
}
-
cur = cur.Parent;
}
+ Toplevel.CheckError158 (name, target.loc);
+
if (labels == null)
labels = new Hashtable ();
known_variables [name] = info;
}
- LocalInfo GetKnownVariableInfo (string name)
+ LocalInfo GetKnownVariableInfo (string name, bool recurse)
{
- if (known_variables == null)
+ if (known_variables != null) {
+ LocalInfo vi = (LocalInfo) known_variables [name];
+ if (vi != null)
+ return vi;
+ }
+
+ if (!recurse || (children == null))
return null;
- return (LocalInfo) known_variables [name];
+
+ foreach (Block block in children) {
+ LocalInfo vi = block.GetKnownVariableInfo (name, true);
+ if (vi != null)
+ return vi;
+ }
+
+ return null;
}
public bool CheckInvariantMeaningInBlock (string name, Expression e, Location loc)
{
Block b = this;
- LocalInfo kvi = b.GetKnownVariableInfo (name);
+ LocalInfo kvi = b.GetKnownVariableInfo (name, true);
while (kvi == null) {
while (b.Implicit)
b = b.Parent;
b = b.Parent;
if (b == null)
return true;
- kvi = b.GetKnownVariableInfo (name);
+ kvi = b.GetKnownVariableInfo (name, false);
}
if (kvi.Block == b)
return false;
}
+ public bool CheckError136_InParents (string name, Location loc)
+ {
+ for (Block b = Parent; b != null; b = b.Parent) {
+ if (!b.DoCheckError136 (name, "parent or current", loc))
+ return false;
+ }
+
+ for (Block b = Toplevel.ContainerBlock; b != null; b = b.Toplevel.ContainerBlock) {
+ if (!b.CheckError136_InParents (name, loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ public bool CheckError136_InChildren (string name, Location loc)
+ {
+ if (!DoCheckError136_InChildren (name, loc))
+ return false;
+
+ Block b = this;
+ while (b.Implicit) {
+ if (!b.Parent.DoCheckError136_InChildren (name, loc))
+ return false;
+ b = b.Parent;
+ }
+
+ return true;
+ }
+
+ protected bool DoCheckError136_InChildren (string name, Location loc)
+ {
+ if (!DoCheckError136 (name, "child", loc))
+ return false;
+
+ if (AnonymousChildren != null) {
+ foreach (ToplevelBlock child in AnonymousChildren) {
+ if (!child.DoCheckError136_InChildren (name, loc))
+ return false;
+ }
+ }
+
+ if (children != null) {
+ foreach (Block child in children) {
+ if (!child.DoCheckError136_InChildren (name, loc))
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ public bool CheckError136 (string name, string scope, bool check_parents,
+ bool check_children, Location loc)
+ {
+ if (!DoCheckError136 (name, scope, loc))
+ return false;
+
+ if (check_parents) {
+ if (!CheckError136_InParents (name, loc))
+ return false;
+ }
+
+ if (check_children) {
+ if (!CheckError136_InChildren (name, loc))
+ return false;
+ }
+
+ for (Block c = Toplevel.ContainerBlock; c != null; c = c.Toplevel.ContainerBlock) {
+ if (!c.DoCheckError136 (name, "parent or current", loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ protected bool DoCheckError136 (string name, string scope, Location loc)
+ {
+ LocalInfo vi = GetKnownVariableInfo (name, false);
+ if (vi != null) {
+ Report.SymbolRelatedToPreviousError (vi.Location, name);
+ Error_AlreadyDeclared (loc, name, scope != null ? scope : "child");
+ return false;
+ }
+
+ int idx;
+ Parameter p = Toplevel.Parameters.GetParameterByName (name, out idx);
+ if (p != null) {
+ Report.SymbolRelatedToPreviousError (p.Location, name);
+ Error_AlreadyDeclared (
+ loc, name, scope != null ? scope : "method argument");
+ return false;
+ }
+
+ return true;
+ }
+
public LocalInfo AddVariable (Expression type, string name, Location l)
{
LocalInfo vi = GetLocalInfo (name);
return null;
}
- vi = GetKnownVariableInfo (name);
- if (vi != null) {
- Report.SymbolRelatedToPreviousError (vi.Location, name);
- Error_AlreadyDeclared (l, name, "child");
- return null;
- }
-
- int idx;
- Parameter p = Toplevel.Parameters.GetParameterByName (name, out idx);
- if (p != null) {
- Report.SymbolRelatedToPreviousError (p.Location, name);
- Error_AlreadyDeclared (l, name, "method argument");
+ if (!CheckError136 (name, null, true, true, l))
return null;
- }
vi = new LocalInfo (type, name, this, l);
-
Variables.Add (name, vi);
-
- for (Block b = this; b != null; b = b.Parent)
- b.AddKnownVariable (name, vi);
+ AddKnownVariable (name, vi);
if ((flags & Flags.VariablesInitialized) != 0)
throw new Exception ();
void Error_AlreadyDeclared (Location loc, string var, string reason)
{
- Report.Error (136, loc, "A local variable named `{0}' cannot be declared in this scope because it would give a different meaning to `{0}', " +
- "which is already used in a `{1}' scope", var, reason);
+ Report.Error (136, loc, "A local variable named `{0}' cannot be declared " +
+ "in this scope because it would give a different meaning " +
+ "to `{0}', which is already used in a `{1}' scope " +
+ "to denote something else", var, reason);
}
public bool AddConstant (Expression type, string name, Expression value, Location l)
public LocalInfo AddTemporaryVariable (TypeExpr te, Location loc)
{
+ Report.Debug (64, "ADD TEMPORARY", this, Toplevel, loc);
+
if (temporary_variables == null)
temporary_variables = new ArrayList ();
}
}
+ public ScopeInfo ScopeInfo;
+
+ public ScopeInfo CreateScopeInfo ()
+ {
+ if (ScopeInfo == null)
+ ScopeInfo = ScopeInfo.CreateScope (this);
+
+ return ScopeInfo;
+ }
+
+ public ArrayList AnonymousChildren {
+ get { return anonymous_children; }
+ }
+
+ public void AddAnonymousChild (ToplevelBlock b)
+ {
+ if (anonymous_children == null)
+ anonymous_children = new ArrayList ();
+
+ anonymous_children.Add (b);
+ }
+
/// <summary>
/// Emits the variable declarations and labels.
/// </summary>
/// </remarks>
public void ResolveMeta (ToplevelBlock toplevel, EmitContext ec, Parameters ip)
{
+ Report.Debug (64, "BLOCK RESOLVE META", this, Parent, toplevel);
+
// If some parent block was unsafe, we remain unsafe even if this block
// isn't explicitly marked as such.
using (ec.With (EmitContext.Flags.InUnsafe, ec.InUnsafe | Unsafe)) {
// which in turn causes the 'must be constant' error to be triggered.
constants.Remove (name);
+ if (!Const.IsConstantTypeValid (variable_type)) {
+ Const.Error_InvalidConstantType (variable_type, loc);
+ continue;
+ }
+
using (ec.With (EmitContext.Flags.ConstantCheckState, (flags & Flags.Unchecked) == 0)) {
ec.CurrentBlock = this;
Expression e = cv.Resolve (ec);
Constant ce = e as Constant;
if (ce == null) {
- Const.Error_ExpressionMustBeConstant (variable_type, vi.Location, name);
+ Const.Error_ExpressionMustBeConstant (vi.Location, name);
continue;
}
- e = ce.ToType (variable_type, vi.Location);
+ e = ce.ImplicitConversionRequired (variable_type, vi.Location);
if (e == null)
continue;
//
// Emits the local variable declarations for a block
//
- public void EmitMeta (EmitContext ec)
+ public virtual void EmitMeta (EmitContext ec)
{
- ILGenerator ig = ec.ig;
-
- if (variables != null){
- bool have_captured_vars = ec.HaveCapturedVariables ();
-
- foreach (DictionaryEntry de in variables){
- LocalInfo vi = (LocalInfo) de.Value;
-
- if (have_captured_vars && ec.IsCaptured (vi))
- continue;
+ Report.Debug (64, "BLOCK EMIT META", this, Parent, Toplevel, ScopeInfo, ec);
+ if (ScopeInfo != null) {
+ scope_init = ScopeInfo.GetScopeInitializer (ec);
+ Report.Debug (64, "BLOCK EMIT META #1", this, Toplevel, ScopeInfo,
+ ec, scope_init);
+ }
- vi.DeclareLocal (ig);
- }
+ if (variables != null){
+ foreach (LocalInfo vi in variables.Values)
+ vi.ResolveVariable (ec);
}
if (temporary_variables != null) {
- AnonymousContainer am = ec.CurrentAnonymousMethod;
- TypeBuilder scope = null;
- if ((am != null) && am.IsIterator) {
- scope = am.Scope.ScopeTypeBuilder;
- if (scope == null)
- throw new InternalErrorException ();
- }
- foreach (LocalInfo vi in temporary_variables) {
- if (scope != null) {
- if (vi.FieldBuilder == null)
- vi.FieldBuilder = scope.DefineField (
- vi.Name, vi.VariableType, FieldAttributes.Assembly);
- } else
- vi.LocalBuilder = ig.DeclareLocal (vi.VariableType);
- }
+ foreach (LocalInfo vi in temporary_variables)
+ vi.ResolveVariable (ec);
}
if (children != null){
Report.Debug (4, "RESOLVE BLOCK", StartLocation, ec.CurrentBranching);
+ //
+ // This flag is used to notate nested statements as unreachable from the beginning of this block.
+ // For the purposes of this resolution, it doesn't matter that the whole block is unreachable
+ // from the beginning of the function. The outer Resolve() that detected the unreachability is
+ // responsible for handling the situation.
+ //
int statement_count = statements.Count;
for (int ix = 0; ix < statement_count; ix++){
Statement s = (Statement) statements [ix];
if (emit_debug_info) {
if (is_lexical_block)
ec.BeginScope ();
+ }
+ ec.Mark (StartLocation, true);
+ if (scope_init != null)
+ scope_init.EmitStatement (ec);
+ DoEmit (ec);
+ ec.Mark (EndLocation, true);
+
+ if (emit_debug_info) {
+ if (is_lexical_block)
+ ec.EndScope ();
if (variables != null) {
foreach (DictionaryEntry de in variables) {
string name = (string) de.Key;
LocalInfo vi = (LocalInfo) de.Value;
- if (vi.LocalBuilder == null)
- continue;
-
- ec.DefineLocalVariable (name, vi.LocalBuilder);
+ vi.EmitSymbolInfo (ec, name);
}
}
}
- ec.Mark (StartLocation, true);
- ec.EmitScopeInitFromBlock (this);
- DoEmit (ec);
- ec.Mark (EndLocation, true);
-
- if (emit_debug_info && is_lexical_block)
- ec.EndScope ();
ec.CurrentBlock = prev_block;
}
// Pointer to the host of this anonymous method, or null
// if we are the topmost block
//
- ToplevelBlock container;
- CaptureContext capture_context;
+ Block container;
+ ToplevelBlock child;
+ GenericMethod generic;
FlowBranchingToplevel top_level_branching;
-
- Hashtable capture_contexts;
- ArrayList children;
+ AnonymousContainer anonymous_container;
+ RootScopeInfo root_scope;
public bool HasVarargs {
get { return (flags & Flags.HasVarargs) != 0; }
set { flags |= Flags.HasVarargs; }
}
+ public bool IsIterator {
+ get { return (flags & Flags.IsIterator) != 0; }
+ }
+
//
// The parameters for the block.
//
- public readonly Parameters Parameters;
-
- public void RegisterCaptureContext (CaptureContext cc)
- {
- if (capture_contexts == null)
- capture_contexts = new Hashtable ();
- capture_contexts [cc] = cc;
+ Parameters parameters;
+ public Parameters Parameters {
+ get { return parameters; }
}
- public void CompleteContexts ()
+ public bool CompleteContexts (EmitContext ec)
{
- if (capture_contexts == null)
- return;
+ Report.Debug (64, "TOPLEVEL COMPLETE CONTEXTS", this,
+ container, root_scope);
+
+ if (root_scope != null)
+ root_scope.LinkScopes ();
+
+ if ((container == null) && (root_scope != null)) {
+ Report.Debug (64, "TOPLEVEL COMPLETE CONTEXTS #1", this,
+ root_scope);
- foreach (CaptureContext cc in capture_contexts.Keys){
- cc.LinkScopes ();
+ if (root_scope.DefineType () == null)
+ return false;
+ if (!root_scope.ResolveType ())
+ return false;
+ if (!root_scope.ResolveMembers ())
+ return false;
+ if (!root_scope.DefineMembers ())
+ return false;
}
+
+ return true;
}
- public CaptureContext ToplevelBlockCaptureContext {
- get { return capture_context; }
+ public GenericMethod GenericMethod {
+ get { return generic; }
}
public ToplevelBlock Container {
- get { return container; }
+ get { return container != null ? container.Toplevel : null; }
}
- protected void AddChild (ToplevelBlock block)
- {
- if (children == null)
- children = new ArrayList ();
+ public Block ContainerBlock {
+ get { return container; }
+ }
- children.Add (block);
+ public AnonymousContainer AnonymousContainer {
+ get { return anonymous_container; }
+ set { anonymous_container = value; }
}
//
// Parent is only used by anonymous blocks to link back to their
// parents
//
- public ToplevelBlock (ToplevelBlock container, Parameters parameters, Location start) :
+ public ToplevelBlock (Block container, Parameters parameters, Location start) :
this (container, (Flags) 0, parameters, start)
{
}
+
+ public ToplevelBlock (Block container, Parameters parameters, GenericMethod generic,
+ Location start) :
+ this (container, parameters, start)
+ {
+ this.generic = generic;
+ }
public ToplevelBlock (Parameters parameters, Location start) :
this (null, (Flags) 0, parameters, start)
{
}
- public ToplevelBlock (ToplevelBlock container, Flags flags, Parameters parameters, Location start) :
+ public ToplevelBlock (Block container, Flags flags, Parameters parameters, Location start) :
base (null, flags | Flags.IsToplevel, start, Location.Null)
{
- Parameters = parameters == null ? Parameters.EmptyReadOnlyParameters : parameters;
+ this.parameters = parameters == null ? Parameters.EmptyReadOnlyParameters : parameters;
this.container = container;
-
- if (container != null)
- container.AddChild (this);
}
public ToplevelBlock (Location loc) : this (null, (Flags) 0, null, loc)
{
}
- public void SetHaveAnonymousMethods (Location loc, AnonymousContainer host)
+ public bool CheckError158 (string name, Location loc)
{
- if (capture_context == null)
- capture_context = new CaptureContext (this, loc, host);
+ if (AnonymousChildren != null) {
+ foreach (ToplevelBlock child in AnonymousChildren) {
+ if (!child.CheckError158 (name, loc))
+ return false;
+ }
+ }
+
+ for (ToplevelBlock c = Container; c != null; c = c.Container) {
+ if (!c.DoCheckError158 (name, loc))
+ return false;
+ }
+
+ return true;
}
- public CaptureContext CaptureContext {
- get { return capture_context; }
+ bool DoCheckError158 (string name, Location loc)
+ {
+ LabeledStatement s = LookupLabel (name);
+ if (s != null) {
+ Error_158 (name, loc);
+ return false;
+ }
+
+ return true;
+ }
+
+ public RootScopeInfo CreateRootScope (TypeContainer host)
+ {
+ if (root_scope != null)
+ return root_scope;
+
+ if (Container == null)
+ root_scope = new RootScopeInfo (
+ this, host, generic, StartLocation);
+
+ ScopeInfo = root_scope;
+ return root_scope;
+ }
+
+ public void CreateIteratorHost (RootScopeInfo root)
+ {
+ Report.Debug (64, "CREATE ITERATOR HOST", this, root,
+ container, root_scope);
+
+ if ((container != null) || (root_scope != null))
+ throw new InternalErrorException ();
+
+ ScopeInfo = root_scope = root;
+ }
+
+ public RootScopeInfo RootScope {
+ get {
+ if (root_scope != null)
+ return root_scope;
+ else if (Container != null)
+ return Container.RootScope;
+ else
+ return null;
+ }
}
public FlowBranchingToplevel TopLevelBranching {
// null. Later on, when resolving the iterator, we need to move the
// anonymous method into that iterator.
//
- public void ReParent (ToplevelBlock new_parent, AnonymousContainer new_host)
+ public void ReParent (ToplevelBlock new_parent)
{
- foreach (ToplevelBlock block in children) {
- if (block.CaptureContext == null)
- continue;
-
- block.container = new_parent;
- block.CaptureContext.ReParent (new_parent, new_host);
- }
+ container = new_parent;
+ Parent = new_parent;
+ new_parent.child = this;
}
//
if (top_level_branching != null)
return true;
+ if (ip != null)
+ parameters = ip;
+
+ if (!IsIterator && (container != null) && (parameters != null)) {
+ foreach (Parameter p in parameters.FixedParameters) {
+ if (!CheckError136_InParents (p.Name, loc))
+ return false;
+ }
+ }
+
ResolveMeta (this, ec, ip);
+ if (child != null)
+ child.ResolveMeta (this, ec, ip);
+
top_level_branching = ec.StartFlowBranching (this);
return Report.Errors == errors;
}
+
+ public override void EmitMeta (EmitContext ec)
+ {
+ base.EmitMeta (ec);
+ parameters.ResolveVariable (this);
+ }
+
+ public void MakeIterator (Iterator iterator)
+ {
+ flags |= Flags.IsIterator;
+
+ Block block = new Block (this);
+ foreach (Statement stmt in statements)
+ block.AddStatement (stmt);
+ statements = new ArrayList ();
+ statements.Add (new MoveNextStatement (iterator, block));
+ }
+
+ protected class MoveNextStatement : Statement {
+ Iterator iterator;
+ Block block;
+
+ public MoveNextStatement (Iterator iterator, Block block)
+ {
+ this.iterator = iterator;
+ this.block = block;
+ this.loc = iterator.Location;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ return block.Resolve (ec);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ iterator.EmitMoveNext (ec, block);
+ }
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("{0} ({1}:{2}{3}:{4})", GetType (), ID, StartLocation,
+ root_scope, anonymous_container != null ?
+ anonymous_container.Scope : null);
+ }
}
public class SwitchLabel {
// Resolves the expression, reduces it to a literal if possible
// and then converts it to the requested type.
//
- public bool ResolveAndReduce (EmitContext ec, Type required_type)
+ public bool ResolveAndReduce (EmitContext ec, Type required_type, bool allow_nullable)
{
Expression e = label.Resolve (ec);
return true;
}
- c = c.ToType (required_type, loc);
+ if (allow_nullable && c.GetValue () == null) {
+ converted = NullStringCase;
+ return true;
+ }
+
+ c = c.ImplicitConversionRequired (required_type, loc);
if (c == null)
return false;
// Computed
//
Label default_target;
+ Label null_target;
Expression new_expr;
bool is_constant;
SwitchSection constant_section;
SwitchSection default_section;
+#if GMCS_SOURCE
+ //
+ // Nullable Types support for GMCS.
+ //
+ Nullable.Unwrap unwrap;
+
+ protected bool HaveUnwrap {
+ get { return unwrap != null; }
+ }
+#else
+ protected bool HaveUnwrap {
+ get { return false; }
+ }
+#endif
+
//
// The types allowed to be implicitly cast from
// on the governing type
// expression that includes any potential conversions to the
// integral types or to string.
//
- Expression SwitchGoverningType (EmitContext ec, Type t)
+ Expression SwitchGoverningType (EmitContext ec, Expression expr)
{
+ Type t = expr.Type;
+
if (t == TypeManager.byte_type ||
t == TypeManager.sbyte_type ||
t == TypeManager.ushort_type ||
t == TypeManager.string_type ||
t == TypeManager.bool_type ||
t.IsSubclassOf (TypeManager.enum_type))
- return Expr;
+ return expr;
if (allowed_types == null){
allowed_types = new Type [] {
foreach (Type tt in allowed_types){
Expression e;
- e = Convert.ImplicitUserConversion (ec, Expr, tt, loc);
+ e = Convert.ImplicitUserConversion (ec, expr, tt, loc);
if (e == null)
continue;
Report.ExtraInformation (
loc,
String.Format ("reason: more than one conversion to an integral type exist for type {0}",
- TypeManager.CSharpName (Expr.Type)));
+ TypeManager.CSharpName (expr.Type)));
return null;
}
continue;
}
- if (!sl.ResolveAndReduce (ec, SwitchType)){
+ if (!sl.ResolveAndReduce (ec, SwitchType, HaveUnwrap)) {
error = true;
continue;
}
object key = sl.Converted;
try {
Elements.Add (key, sl);
+ } catch (ArgumentException) {
+ sl.Erorr_AlreadyOccurs ();
+ error = true;
}
- catch (ArgumentException) {
- sl.Erorr_AlreadyOccurs ();
- error = true;
- }
}
}
return !error;
// now emit the code for the sections
bool fFoundDefault = false;
+ bool fFoundNull = false;
+ foreach (SwitchSection ss in Sections)
+ {
+ foreach (SwitchLabel sl in ss.Labels)
+ if (sl.Converted == SwitchLabel.NullStringCase)
+ fFoundNull = true;
+ }
+
foreach (SwitchSection ss in Sections)
{
foreach (SwitchLabel sl in ss.Labels)
{
ig.MarkLabel (sl.GetILLabel (ec));
ig.MarkLabel (sl.GetILLabelCode (ec));
- if (sl.Label == null)
- {
+ if (sl.Converted == SwitchLabel.NullStringCase)
+ ig.MarkLabel (null_target);
+ else if (sl.Label == null) {
ig.MarkLabel (lblDefault);
fFoundDefault = true;
+ if (!fFoundNull)
+ ig.MarkLabel (null_target);
}
}
ss.Block.Emit (ec);
- //ig.Emit (OpCodes.Br, lblEnd);
}
if (!fFoundDefault) {
ILGenerator ig = ec.ig;
Label end_of_switch = ig.DefineLabel ();
Label next_test = ig.DefineLabel ();
- Label null_target = ig.DefineLabel ();
bool first_test = true;
bool pending_goto_end = false;
bool null_marked = false;
if (Expr == null)
return false;
- new_expr = SwitchGoverningType (ec, Expr.Type);
+ new_expr = SwitchGoverningType (ec, Expr);
+
+#if GMCS_SOURCE
+ if ((new_expr == null) && TypeManager.IsNullableType (Expr.Type)) {
+ unwrap = Nullable.Unwrap.Create (Expr, ec);
+ if (unwrap == null)
+ return false;
+
+ new_expr = SwitchGoverningType (ec, unwrap);
+ }
+#endif
+
if (new_expr == null){
Report.Error (151, loc, "A value of an integral type or string expected for switch");
return false;
if (!CheckSwitch (ec))
return false;
+ if (HaveUnwrap)
+ Elements.Remove (SwitchLabel.NullStringCase);
+
Switch old_switch = ec.Switch;
ec.Switch = this;
ec.Switch.SwitchType = SwitchType;
{
ILGenerator ig = ec.ig;
+ default_target = ig.DefineLabel ();
+ null_target = ig.DefineLabel ();
+
// Store variable for comparission purposes
LocalBuilder value;
- if (!is_constant) {
+ if (HaveUnwrap) {
+ value = ig.DeclareLocal (SwitchType);
+#if GMCS_SOURCE
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, null_target);
+ new_expr.Emit (ec);
+ ig.Emit (OpCodes.Stloc, value);
+#endif
+ } else if (!is_constant) {
value = ig.DeclareLocal (SwitchType);
new_expr.Emit (ec);
ig.Emit (OpCodes.Stloc, value);
} else
value = null;
- default_target = ig.DefineLabel ();
-
//
// Setup the codegen context
//
}
public abstract void Emit (EmitContext ec);
- public abstract void EmitExit (ILGenerator ig);
+ public abstract void EmitExit (EmitContext ec);
}
class ExpressionEmitter : Emitter {
// Store pointer in pinned location
//
converted.Emit (ec);
- ec.ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ vi.Variable.EmitAssign (ec);
}
- public override void EmitExit (ILGenerator ig)
+ public override void EmitExit (EmitContext ec)
{
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Conv_U);
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+ ec.ig.Emit (OpCodes.Conv_U);
+ vi.Variable.EmitAssign (ec);
}
}
return;
converted.Emit (ec);
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ vi.Variable.EmitAssign (ec);
}
- public override void EmitExit(ILGenerator ig)
+ public override void EmitExit (EmitContext ec)
{
- ig.Emit (OpCodes.Ldnull);
- ig.Emit (OpCodes.Stloc, pinned_string);
+ ec.ig.Emit (OpCodes.Ldnull);
+ ec.ig.Emit (OpCodes.Stloc, pinned_string);
}
}
return false;
if (!Convert.ImplicitConversionExists (ec, e, expr_type)) {
- e.Error_ValueCannotBeConverted (e.Location, expr_type, false);
+ e.Error_ValueCannotBeConverted (ec, e.Location, expr_type, false);
return false;
}
if (has_ret)
return;
- ILGenerator ig = ec.ig;
-
//
// Clear the pinned variable
//
for (int i = 0; i < data.Length; i++) {
- data [i].EmitExit (ig);
+ data [i].EmitExit (ec);
}
}
}
protected override void DoEmit(EmitContext ec)
{
+ ILGenerator ig = ec.ig;
+
+ if (CatchType != null)
+ ig.BeginCatchBlock (CatchType);
+ else
+ ig.BeginCatchBlock (TypeManager.object_type);
+
+ if (VarBlock != null)
+ VarBlock.Emit (ec);
+
+ if (Name != null) {
+ LocalInfo vi = Block.GetLocalInfo (Name);
+ if (vi == null)
+ throw new Exception ("Variable does not exist in this block");
+
+ if (vi.Variable.NeedsTemporary) {
+ LocalBuilder e = ig.DeclareLocal (vi.VariableType);
+ ig.Emit (OpCodes.Stloc, e);
+
+ vi.Variable.EmitInstance (ec);
+ ig.Emit (OpCodes.Ldloc, e);
+ vi.Variable.EmitAssign (ec);
+ } else
+ vi.Variable.EmitAssign (ec);
+ } else
+ ig.Emit (OpCodes.Pop);
+
+ Block.Emit (ec);
}
public override bool Resolve (EmitContext ec)
ig.BeginExceptionBlock ();
Block.Emit (ec);
- foreach (Catch c in Specific){
- LocalInfo vi;
-
- ig.BeginCatchBlock (c.CatchType);
-
- if (c.VarBlock != null)
- ec.EmitScopeInitFromBlock (c.VarBlock);
- if (c.Name != null){
- vi = c.Block.GetLocalInfo (c.Name);
- if (vi == null)
- throw new Exception ("Variable does not exist in this block");
+ foreach (Catch c in Specific)
+ c.Emit (ec);
- if (vi.IsCaptured){
- LocalBuilder e = ig.DeclareLocal (vi.VariableType);
- ig.Emit (OpCodes.Stloc, e);
-
- ec.EmitCapturedVariableInstance (vi);
- ig.Emit (OpCodes.Ldloc, e);
- ig.Emit (OpCodes.Stfld, vi.FieldBuilder);
- } else
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
- } else
- ig.Emit (OpCodes.Pop);
-
- c.Block.Emit (ec);
- }
-
- if (General != null){
- ig.BeginCatchBlock (TypeManager.object_type);
- ig.Emit (OpCodes.Pop);
- General.Block.Emit (ec);
- }
+ if (General != null)
+ General.Emit (ec);
DoEmitFinally (ec);
if (need_exc_block)
Expression [] resolved_vars;
Expression [] converted_vars;
ExpressionStatement [] assign;
- LocalBuilder local_copy;
+ TemporaryVariable local_copy;
public Using (object expression_or_block, Statement stmt, Location l)
{
}
}
+ local_copy = new TemporaryVariable (expr_type, loc);
+ local_copy.Resolve (ec);
+
return true;
}
ig.BeginExceptionBlock ();
}
Statement.Emit (ec);
+
var_list.Reverse ();
DoEmitFinally (ec);
Expression var = resolved_vars [--i];
Label skip = ig.DefineLabel ();
+ if (emit_finally)
+ ig.BeginFinallyBlock ();
+
if (!var.Type.IsValueType) {
var.Emit (ec);
ig.Emit (OpCodes.Brfalse, skip);
// Make a copy of the expression and operate on that.
//
ILGenerator ig = ec.ig;
- local_copy = ig.DeclareLocal (expr_type);
- expr.Emit (ec);
- ig.Emit (OpCodes.Stloc, local_copy);
+ local_copy.Store (ec, expr);
if (emit_finally)
ig.BeginExceptionBlock ();
void EmitExpressionFinally (EmitContext ec)
{
ILGenerator ig = ec.ig;
- if (!local_copy.LocalType.IsValueType) {
+ if (!expr_type.IsValueType) {
Label skip = ig.DefineLabel ();
- ig.Emit (OpCodes.Ldloc, local_copy);
+ local_copy.Emit (ec);
ig.Emit (OpCodes.Brfalse, skip);
- ig.Emit (OpCodes.Ldloc, local_copy);
+ local_copy.Emit (ec);
ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
ig.MarkLabel (skip);
} else {
- Expression ml = Expression.MemberLookup(ec.ContainerType, TypeManager.idisposable_type, local_copy.LocalType, "Dispose", Mono.CSharp.Location.Null);
+ Expression ml = Expression.MemberLookup (
+ ec.ContainerType, TypeManager.idisposable_type, expr_type,
+ "Dispose", Location.Null);
if (!(ml is MethodGroupExpr)) {
- ig.Emit (OpCodes.Ldloc, local_copy);
- ig.Emit (OpCodes.Box, local_copy.LocalType);
+ local_copy.Emit (ec);
+ ig.Emit (OpCodes.Box, expr_type);
ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
} else {
MethodInfo mi = null;
return;
}
- ig.Emit (OpCodes.Ldloca, local_copy);
+ local_copy.AddressOf (ec, AddressOp.Load);
ig.Emit (OpCodes.Call, mi);
}
}
return false;
}
- ResolveFinally (branching);
+ ResolveFinally (branching);
FlowBranching.Reachability reachability = ec.EndFlowBranching ();
if (!reachability.AlwaysReturns) {
Type var_type = texpr.Type;
- if (expr.eclass == ExprClass.MethodGroup || expr is AnonymousMethod) {
+ if (expr.eclass == ExprClass.MethodGroup || expr is AnonymousMethodExpression) {
Report.Error (446, expr.Location, "Foreach statement cannot operate on a `{0}'",
expr.ExprClassName);
return false;
{
EmitThis (ec);
ec.ig.Emit (OpCodes.Ldc_I4_0);
- EmitStore (ec.ig);
+ EmitStore (ec);
}
public void Increment (EmitContext ec)
Emit (ec);
ec.ig.Emit (OpCodes.Ldc_I4_1);
ec.ig.Emit (OpCodes.Add);
- EmitStore (ec.ig);
+ EmitStore (ec);
}
}
lengths [i].EmitThis (ec);
((ArrayAccess) access).EmitGetLength (ec, i);
- lengths [i].EmitStore (ig);
+ lengths [i].EmitStore (ec);
}
for (int i = 0; i < rank; i++) {
// way I could do this without a goto
//
+#if GMCS_SOURCE
+ //
+ // Prefer a generic enumerator over a non-generic one.
+ //
+ if (return_type.IsInterface && return_type.IsGenericType) {
+ enumerator_type = return_type;
+ if (!FetchGetCurrent (ec, return_type))
+ get_current = new PropertyExpr (
+ ec.ContainerType, TypeManager.ienumerator_getcurrent, loc);
+ if (!FetchMoveNext (return_type))
+ move_next = TypeManager.bool_movenext_void;
+ return true;
+ }
+#endif
+
if (return_type.IsInterface ||
!FetchMoveNext (return_type) ||
!FetchGetCurrent (ec, return_type)) {
+ enumerator_type = return_type;
move_next = TypeManager.bool_movenext_void;
get_current = new PropertyExpr (
ec.ContainerType, TypeManager.ienumerator_getcurrent, loc);
if (mg == null)
return false;
- foreach (MethodBase mb in mg.Methods) {
- if (TypeManager.GetParameterData (mb).Count != 0)
+ MethodInfo result = null;
+ MethodInfo tmp_move_next = null;
+ PropertyExpr tmp_get_cur = null;
+ Type tmp_enumerator_type = enumerator_type;
+ foreach (MethodInfo mi in mg.Methods) {
+ if (TypeManager.GetParameterData (mi).Count != 0)
continue;
// Check whether GetEnumerator is public
- if ((mb.Attributes & MethodAttributes.Public) != MethodAttributes.Public)
+ if ((mi.Attributes & MethodAttributes.Public) != MethodAttributes.Public)
continue;
- if (TypeManager.IsOverride (mb))
+ if (TypeManager.IsOverride (mi))
continue;
enumerator_found = true;
- if (!GetEnumeratorFilter (ec, (MethodInfo) mb))
+ if (!GetEnumeratorFilter (ec, mi))
continue;
- MethodInfo[] mi = new MethodInfo[] { (MethodInfo) mb };
+ if (result != null) {
+ if (TypeManager.IsGenericType (result.ReturnType)) {
+ if (!TypeManager.IsGenericType (mi.ReturnType))
+ continue;
+
+ Report.SymbolRelatedToPreviousError(t);
+ Report.Error(1640, loc, "foreach statement cannot operate on variables of type `{0}' " +
+ "because it contains multiple implementation of `{1}'. Try casting to a specific implementation",
+ TypeManager.CSharpName (t), TypeManager.CSharpSignature (mi));
+ return false;
+ }
+
+ // Always prefer generics enumerators
+ if (TypeManager.IsGenericType(mi.ReturnType))
+ continue;
+
+ Report.SymbolRelatedToPreviousError (result);
+ Report.SymbolRelatedToPreviousError (mi);
+ Report.Warning (278, 2, loc, "`{0}' contains ambiguous implementation of `{1}' pattern. Method `{2}' is ambiguous with method `{3}'",
+ TypeManager.CSharpName (t), "enumerable", TypeManager.CSharpSignature (result), TypeManager.CSharpSignature (mi));
+ }
+ result = mi;
+ tmp_move_next = move_next;
+ tmp_get_cur = get_current;
+ tmp_enumerator_type = enumerator_type;
+ if (mi.DeclaringType == t)
+ break;
+ }
+
+ if (result != null) {
+ move_next = tmp_move_next;
+ get_current = tmp_get_cur;
+ enumerator_type = tmp_enumerator_type;
+ MethodInfo[] mi = new MethodInfo[] { (MethodInfo) result };
get_enumerator = new MethodGroupExpr (mi, loc);
if (t != expr.Type) {
bool ProbeCollectionType (EmitContext ec, Type t)
{
+ int errors = Report.Errors;
for (Type tt = t; tt != null && tt != TypeManager.object_type;){
if (TryType (ec, tt))
return true;
tt = tt.BaseType;
}
+ if (Report.Errors > errors)
+ return false;
+
//
// Now try to find the method in the interfaces
//
projects / mono.git / blobdiff