//
// Author:
// Miguel de Icaza (miguel@ximian.com)
-// Martin Baulig (martin@gnome.org)
+// Martin Baulig (martin@ximian.com)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
+// (C) 2003, 2004 Novell, Inc.
//
using System;
// in unreachable code, for instance.
//
+ if (warn && (RootContext.WarningLevel >= 2))
+ Report.Warning (162, loc, "Unreachable code detected");
+
ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
bool ok = Resolve (ec);
ec.KillFlowBranching ();
- if (!ok)
- return false;
-
- if (warn && (RootContext.WarningLevel >= 2))
- Report.Warning (162, loc, "Unreachable code detected");
- return true;
+ return ok;
}
protected void CheckObsolete (Type type)
public override bool Resolve (EmitContext ec)
{
+ bool ok = true;
+
Report.Debug (1, "START IF BLOCK", loc);
expr = Expression.ResolveBoolean (ec, expr, loc);
if (expr == null){
- return false;
+ ok = false;
+ goto skip;
}
+ Assign ass = expr as Assign;
+ if (ass != null && ass.Source is Constant) {
+ Report.Warning (665, 3, loc, "Assignment in conditional expression is always constant; did you mean to use == instead of = ?");
+ }
+
//
// Dead code elimination
//
if ((FalseStatement != null) &&
!FalseStatement.Resolve (ec))
- return false;
- }
+ return false;
+ }
return true;
}
-
+ skip:
ec.StartFlowBranching (FlowBranching.BranchingType.Conditional, loc);
- bool ok = TrueStatement.Resolve (ec);
+ ok &= TrueStatement.Resolve (ec);
is_true_ret = ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable;
ec.CurrentBranching.CreateSibling ();
- if ((FalseStatement != null) && !FalseStatement.Resolve (ec))
- ok = false;
+ if (FalseStatement != null)
+ ok &= FalseStatement.Resolve (ec);
ec.EndFlowBranching ();
}
ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+ if (!infinite)
+ ec.CurrentBranching.CreateSibling ();
if (!Statement.Resolve (ec))
ok = false;
- ec.CurrentBranching.Infinite = infinite;
- ec.EndFlowBranching ();
+ ec.CurrentBranching.Infinite = infinite;
+ ec.EndFlowBranching ();
return ok;
}
public override bool Resolve (EmitContext ec)
{
- expr = expr.ResolveStatement (ec);
+ if (expr != null)
+ expr = expr.ResolveStatement (ec);
return expr != null;
}
public override bool Resolve (EmitContext ec)
{
if (ec.ReturnType == null){
- if (Expr != null){
+ if (Expr != null){
+ if (ec.CurrentAnonymousMethod != null){
+ Report.Error (1662, loc, String.Format (
+ "Anonymous method could not be converted to delegate " +
+ "since the return value does not match the delegate value"));
+ }
Error (127, "Return with a value not allowed here");
return false;
}
return false;
}
+ if (ec.InIterator) {
+ Report.Error (1622, loc, "Cannot return a value from iterators. Use the yield return " +
+ "statement to return a value, or yield break to end the iteration");
+ return false;
+ }
+
Expr = Expr.Resolve (ec);
if (Expr == null)
return false;
if (ec.CurrentBranching.InTryOrCatch (true)) {
ec.CurrentBranching.AddFinallyVector (vector);
in_exc = true;
- } else if (ec.CurrentBranching.InFinally (true)) {
+ } else if (ec.InFinally) {
Error (157, "Control can not leave the body of the finally block");
return false;
} else
vector.CheckOutParameters (ec.CurrentBranching);
+ if (in_exc)
+ ec.NeedReturnLabel ();
+
ec.CurrentBranching.CurrentUsageVector.Return ();
return true;
}
ec.ig.Emit (OpCodes.Stloc, ec.TemporaryReturn ());
}
- if (in_exc) {
- ec.NeedReturnLabel ();
+ if (in_exc)
ec.ig.Emit (OpCodes.Leave, ec.ReturnLabel);
- } else {
+ else
ec.ig.Emit (OpCodes.Ret);
}
}
- }
public class Goto : Statement {
string target;
- Block block;
LabeledStatement label;
public override bool Resolve (EmitContext ec)
label.AddUsageVector (ec.CurrentBranching.CurrentUsageVector);
ec.CurrentBranching.CurrentUsageVector.Goto ();
+ label.AddReference ();
return true;
}
- public Goto (Block parent_block, string label, Location l)
+ public Goto (string label, Location l)
{
- block = parent_block;
loc = l;
target = label;
}
bool defined;
bool referenced;
Label label;
+ ILGenerator ig;
FlowBranching.UsageVector vectors;
{
if (defined)
return label;
+ ig = ec.ig;
label = ec.ig.DefineLabel ();
defined = true;
{
ec.CurrentBranching.Label (vectors);
- referenced = true;
-
return true;
}
protected override void DoEmit (EmitContext ec)
{
+ if (ig != null && ig != ec.ig) {
+ Report.Error (1632, "Control cannot leave body of anonymous method");
+ return;
+ }
LabelTarget (ec);
ec.ig.MarkLabel (label);
}
+
+ public void AddReference ()
+ {
+ referenced = true;
+ }
}
/// </summary>
public class GotoCase : Statement {
Expression expr;
- Label label;
+ SwitchLabel sl;
public GotoCase (Expression e, Location l)
{
if (val == null)
return false;
- SwitchLabel sl = (SwitchLabel) ec.Switch.Elements [val];
+ sl = (SwitchLabel) ec.Switch.Elements [val];
if (sl == null){
Report.Error (
return false;
}
- label = sl.ILLabelCode;
-
ec.CurrentBranching.CurrentUsageVector.Goto ();
return true;
}
protected override void DoEmit (EmitContext ec)
{
- ec.ig.Emit (OpCodes.Br, label);
+ ec.ig.Emit (OpCodes.Br, sl.GetILLabelCode (ec));
}
}
public override bool Resolve (EmitContext ec)
{
- bool in_catch = ec.CurrentBranching.InCatch ();
ec.CurrentBranching.CurrentUsageVector.Throw ();
if (expr != null){
ExprClass eclass = expr.eclass;
if (!(eclass == ExprClass.Variable || eclass == ExprClass.PropertyAccess ||
- eclass == ExprClass.Value || eclass == ExprClass.IndexerAccess)) {
+ eclass == ExprClass.Value || eclass == ExprClass.IndexerAccess)) {
expr.Error_UnexpectedKind ("value, variable, property or indexer access ", loc);
return false;
}
Type t = expr.Type;
if ((t != TypeManager.exception_type) &&
- !t.IsSubclassOf (TypeManager.exception_type) &&
- !(expr is NullLiteral)) {
+ !t.IsSubclassOf (TypeManager.exception_type) &&
+ !(expr is NullLiteral)) {
Error (155,
- "The type caught or thrown must be derived " +
- "from System.Exception");
+ "The type caught or thrown must be derived " +
+ "from System.Exception");
return false;
}
- } else if (!in_catch) {
- Error (156,
- "A throw statement with no argument is only " +
- "allowed in a catch clause");
+ return true;
+ }
+
+ if (!ec.InCatch) {
+ Error (156, "A throw statement with no arguments is not allowed outside of a catch clause");
return false;
}
+ if (ec.InFinally) {
+ Error (724, "A throw statement with no argument is only allowed in a catch clause nested inside of the innermost catch clause");
+ return false;
+ }
return true;
}
if (!ec.CurrentBranching.InLoop () && !ec.CurrentBranching.InSwitch ()){
Error (139, "No enclosing loop or switch to continue to");
return false;
- } else if (ec.CurrentBranching.InFinally (false)) {
+ } else if (ec.InFinally && ec.CurrentBranching.BreakCrossesTryCatchBoundary()) {
Error (157, "Control can not leave the body of the finally block");
return false;
} else if (ec.CurrentBranching.InTryOrCatch (false))
ec.CurrentBranching.AddFinallyVector (
ec.CurrentBranching.CurrentUsageVector);
- else if (ec.CurrentBranching.InLoop ())
+ else if (ec.CurrentBranching.InLoop () || ec.CurrentBranching.InSwitch ())
ec.CurrentBranching.AddBreakVector (
ec.CurrentBranching.CurrentUsageVector);
crossing_exc = ec.CurrentBranching.BreakCrossesTryCatchBoundary ();
+ if (!crossing_exc)
+ ec.NeedReturnLabel ();
+
ec.CurrentBranching.CurrentUsageVector.Break ();
return true;
}
if (crossing_exc)
ig.Emit (OpCodes.Leave, ec.LoopEnd);
else {
- ec.NeedReturnLabel ();
ig.Emit (OpCodes.Br, ec.LoopEnd);
}
}
if (!ec.CurrentBranching.InLoop () && !ec.CurrentBranching.InSwitch ()){
Error (139, "No enclosing loop to continue to");
return false;
- } else if (ec.CurrentBranching.InFinally (false)) {
+ } else if (ec.InFinally) {
Error (157, "Control can not leave the body of the finally block");
return false;
} else if (ec.CurrentBranching.InTryOrCatch (false))
}
}
+ //
+ // 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. The context of the field will
+ // 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
//
//
Used = 1,
ReadOnly = 2,
Pinned = 4,
- IsThis = 8
+ IsThis = 8,
+ Captured = 16,
+ AddressTaken = 32
}
- Flags flags;
+ public enum ReadOnlyContext: byte {
+ Using,
+ Foreach,
+ Fixed
+ }
+ Flags flags;
+ ReadOnlyContext ro_context;
+
public LocalInfo (Expression type, string name, Block block, Location l)
{
Type = type;
public bool Resolve (EmitContext ec)
{
- if (VariableType == null)
- VariableType = ec.DeclSpace.ResolveType (Type, false, Location);
+ if (VariableType == null) {
+ TypeExpr texpr = Type.ResolveAsTypeTerminal (ec);
+ if (texpr == null)
+ return false;
+
+ VariableType = texpr.Type;
+ }
if (VariableType == TypeManager.void_type) {
Report.Error (1547, Location,
return false;
}
- if (VariableType == null)
- return false;
-
if (VariableType.IsAbstract && VariableType.IsSealed) {
Report.Error (723, Location, "Cannot declare variable of static type '{0}'", TypeManager.CSharpName (VariableType));
return false;
}
}
+ public bool IsCaptured {
+ get {
+ return (flags & Flags.Captured) != 0;
+ }
+
+ set {
+ flags |= Flags.Captured;
+ }
+ }
+
+ public bool AddressTaken {
+ get {
+ return (flags & Flags.AddressTaken) != 0;
+ }
+
+ set {
+ flags |= Flags.AddressTaken;
+ }
+ }
+
public override string ToString ()
{
return String.Format ("LocalInfo ({0},{1},{2},{3})",
return (flags & Flags.Used) != 0;
}
set {
- flags = value ? (flags | Flags.Used) : (flags & ~Flags.Used);
+ flags = value ? (flags | Flags.Used) : (unchecked (flags & ~Flags.Used));
}
}
get {
return (flags & Flags.ReadOnly) != 0;
}
- set {
- flags = value ? (flags | Flags.ReadOnly) : (flags & ~Flags.ReadOnly);
+ }
+
+ public void SetReadOnlyContext (ReadOnlyContext context)
+ {
+ flags |= Flags.ReadOnly;
+ ro_context = context;
+ }
+
+ public string GetReadOnlyContext ()
+ {
+ if (!ReadOnly)
+ throw new InternalErrorException ("Variable is not readonly");
+
+ switch (ro_context) {
+ case ReadOnlyContext.Fixed:
+ return "fixed variable";
+ case ReadOnlyContext.Foreach:
+ return "foreach iteration variable";
+ case ReadOnlyContext.Using:
+ return "using variable";
}
+ throw new NotImplementedException ();
}
//
/// they contain extra information that is not necessary on normal blocks.
/// </remarks>
public class Block : Statement {
- public readonly Block Parent;
+ public Block Parent;
public readonly Location StartLocation;
public Location EndLocation = Location.Null;
+ public readonly ToplevelBlock Toplevel;
+
[Flags]
- public enum Flags : byte {
+ public enum Flags {
Implicit = 1,
Unchecked = 2,
BlockUsed = 4,
VariablesInitialized = 8,
HasRet = 16,
IsDestructor = 32,
- HasVarargs = 64
+ HasVarargs = 64,
+ IsToplevel = 128,
+ Unsafe = 256
}
Flags flags;
}
}
+ public bool Unsafe {
+ get {
+ return (flags & Flags.Unsafe) != 0;
+ }
+ set {
+ flags |= Flags.Unsafe;
+ }
+ }
+
public bool HasVarargs {
get {
if (Parent != null)
//
// Keeps track of constants
Hashtable constants;
-
+
//
// If this is a switch section, the enclosing switch block.
//
Block switch_block;
- static int id;
+ protected static int id;
int this_id;
: this (parent, flags, Location.Null, Location.Null)
{ }
- public Block (Block parent, Flags flags, Parameters parameters)
- : this (parent, flags, parameters, Location.Null, Location.Null)
- { }
-
public Block (Block parent, Location start, Location end)
: this (parent, (Flags) 0, start, end)
{ }
- public Block (Block parent, Parameters parameters, Location start, Location end)
- : this (parent, (Flags) 0, parameters, start, end)
- { }
-
public Block (Block parent, Flags flags, Location start, Location end)
- : this (parent, flags, Parameters.EmptyReadOnlyParameters, start, end)
- { }
-
- public Block (Block parent, Flags flags, Parameters parameters,
- Location start, Location end)
{
if (parent != null)
parent.AddChild (this);
this.Parent = parent;
this.flags = flags;
- this.parameters = parameters;
this.StartLocation = start;
this.EndLocation = end;
this.loc = start;
this_id = id++;
statements = new ArrayList ();
+ if ((flags & Flags.IsToplevel) != 0)
+ Toplevel = (ToplevelBlock) this;
+ else
+ Toplevel = parent.Toplevel;
+
if (parent != null && Implicit) {
- if (parent.child_variable_names == null)
- parent.child_variable_names = new Hashtable();
+ if (parent.known_variables == null)
+ parent.known_variables = new Hashtable ();
// share with parent
- child_variable_names = parent.child_variable_names;
+ known_variables = parent.known_variables;
}
}
// </summary>
public LocalInfo ThisVariable {
get {
- if (this_variable != null)
- return this_variable;
- else if (Parent != null)
- return Parent.ThisVariable;
- else
- return null;
+ for (Block b = this; b != null; b = b.Parent) {
+ if (b.this_variable != null)
+ return b.this_variable;
+ }
+
+ return null;
}
}
- Hashtable child_variable_names;
+ Hashtable known_variables;
// <summary>
- // Marks a variable with name @name as being used in a child block.
+ // Marks a variable with name @name as being used in this or a child block.
// If a variable name has been used in a child block, it's illegal to
// declare a variable with the same name in the current block.
// </summary>
- public void AddChildVariableName (string name)
+ void AddKnownVariable (string name, LocalInfo info)
{
- if (child_variable_names == null)
- child_variable_names = new Hashtable ();
+ if (known_variables == null)
+ known_variables = new Hashtable ();
- if (!child_variable_names.Contains (name))
- child_variable_names.Add (name, true);
+ known_variables [name] = info;
}
- // <summary>
- // Checks whether a variable name has already been used in a child block.
- // </summary>
- public bool IsVariableNameUsedInChildBlock (string name)
+ LocalInfo GetKnownVariableInfo (string name)
{
- if (child_variable_names == null)
+ if (known_variables == null)
+ return null;
+ return (LocalInfo) known_variables [name];
+ }
+
+ public bool CheckInvariantMeaningInBlock (string name, Expression e, Location loc)
+ {
+ LocalInfo kvi = GetKnownVariableInfo (name);
+ if (kvi == null || kvi.Block == this)
+ return true;
+
+ if (known_variables != kvi.Block.known_variables) {
+ Report.SymbolRelatedToPreviousError (kvi.Location, name);
+ Report.Error (135, loc, "'{0}' has a different meaning in a child block", name);
return false;
+ }
+
+ //
+ // this block and kvi.Block are the same textual block.
+ // However, different variables are extant.
+ //
+ // Check if the variable is in scope in both blocks. We use
+ // an indirect check that depends on AddVariable doing its
+ // part in maintaining the invariant-meaning-in-block property.
+ //
+ if (e is LocalVariableReference || (e is Constant && GetLocalInfo (name) != null))
+ return true;
- return child_variable_names.Contains (name);
+ Report.SymbolRelatedToPreviousError (kvi.Location, name);
+ Report.Error (136, loc, "'{0}' has a different meaning later in the block", name);
+ return false;
}
// <summary>
return this_variable;
}
- public LocalInfo AddVariable (Expression type, string name, Parameters pars, Location l)
+ public LocalInfo AddVariable (Expression type, string name, Location l)
{
if (variables == null)
variables = new Hashtable ();
LocalInfo vi = GetLocalInfo (name);
if (vi != null) {
- if (vi.Block != this)
- Report.Error (136, l, "A local variable named `" + name + "' " +
- "cannot be declared in this scope since it would " +
- "give a different meaning to `" + name + "', which " +
- "is already used in a `parent or current' scope to " +
- "denote something else");
+ Report.SymbolRelatedToPreviousError (vi.Location, name);
+ if (known_variables == vi.Block.known_variables)
+ Report.Error (128, l,
+ "A local variable '{0}' is already declared in this scope", name);
else
- Report.Error (128, l, "A local variable `" + name + "' is already " +
- "defined in this scope");
+ Report.Error (136, l,
+ "'{0}' hides the declaration of local variable '{0}' in a parent scope", name);
return null;
}
- if (IsVariableNameUsedInChildBlock (name)) {
- Report.Error (136, l, "A local variable named `" + name + "' " +
- "cannot be declared in this scope since it would " +
- "give a different meaning to `" + name + "', which " +
- "is already used in a `child' scope to denote something " +
- "else");
+ vi = GetKnownVariableInfo (name);
+ if (vi != null) {
+ Report.SymbolRelatedToPreviousError (vi.Location, name);
+ Report.Error (136, l,
+ "A child block already has a declaration of local variable '{0}':" +
+ " allowing this declaration would violate 'invariant meaning in a block'",
+ name);
return null;
}
- if (pars != null) {
- int idx;
- Parameter p = pars.GetParameterByName (name, out idx);
- if (p != null) {
- Report.Error (136, l, "A local variable named `" + name + "' " +
- "cannot be declared in this scope since it would " +
- "give a different meaning to `" + name + "', which " +
- "is already used in a `parent or current' scope to " +
- "denote something else");
- return null;
- }
+ int idx;
+ Parameter p = Toplevel.Parameters.GetParameterByName (name, out idx);
+ if (p != null) {
+ Report.SymbolRelatedToPreviousError (Toplevel.Parameters.Location, name);
+ Report.Error (136, l, "'{0}' hides a method parameter", name);
+ return null;
}
vi = new LocalInfo (type, name, this, l);
variables.Add (name, vi);
- // Mark 'name' as "used by a child block" in every surrounding block
- Block cur = this;
- while (cur != null && cur.Implicit)
- cur = cur.Parent;
- if (cur != null)
- for (Block par = cur.Parent; par != null; par = par.Parent)
- par.AddChildVariableName (name);
+ for (Block b = this; b != null; b = b.Parent)
+ b.AddKnownVariable (name, vi);
if ((flags & Flags.VariablesInitialized) != 0)
throw new Exception ();
return vi;
}
- public bool AddConstant (Expression type, string name, Expression value, Parameters pars, Location l)
+ public bool AddConstant (Expression type, string name, Expression value, Location l)
{
- if (AddVariable (type, name, pars, l) == null)
+ if (AddVariable (type, name, l) == null)
return false;
if (constants == null)
return e != null;
}
- Parameters parameters = null;
- public Parameters Parameters {
- get {
- Block b = this;
- while (b.Parent != null)
- b = b.Parent;
- return b.parameters;
- }
- }
-
/// <returns>
/// A list of labels that were not used within this block
/// </returns>
public VariableMap ParameterMap {
get {
if ((flags & Flags.VariablesInitialized) == 0)
- throw new Exception ();
+ throw new Exception ("Variables have not been initialized yet");
return param_map;
}
public VariableMap LocalMap {
get {
if ((flags & Flags.VariablesInitialized) == 0)
- throw new Exception ();
+ throw new Exception ("Variables have not been initialized yet");
return local_map;
}
}
- public bool LiftVariable (LocalInfo local_info)
- {
- return false;
- }
-
/// <summary>
/// Emits the variable declarations and labels.
/// </summary>
/// tc: is our typecontainer (to resolve type references)
/// ig: is the code generator:
/// </remarks>
- public void EmitMeta (EmitContext ec, InternalParameters ip)
+ public void ResolveMeta (ToplevelBlock toplevel, EmitContext ec, InternalParameters ip)
{
- ILGenerator ig = ec.ig;
+ bool old_unsafe = ec.InUnsafe;
+
+ // If some parent block was unsafe, we remain unsafe even if this block
+ // isn't explicitly marked as such.
+ ec.InUnsafe |= Unsafe;
//
// Compute the VariableMap's.
bool old_check_state = ec.ConstantCheckState;
ec.ConstantCheckState = (flags & Flags.Unchecked) == 0;
- bool remap_locals = ec.RemapToProxy;
//
// Process this block variables
continue;
}
+#if false
if (remap_locals)
vi.FieldBuilder = ec.MapVariable (name, vi.VariableType);
else if (vi.Pinned)
vi.LocalBuilder = TypeManager.DeclareLocalPinned (ig, vi.VariableType);
else if (!vi.IsThis)
vi.LocalBuilder = ig.DeclareLocal (vi.VariableType);
+#endif
if (constants == null)
continue;
ec.CurrentBlock = this;
Expression e = cv.Resolve (ec);
- if (e == null)
- continue;
Constant ce = e as Constant;
if (ce == null){
Report.Error (133, vi.Location,
- "The expression being assigned to `" +
- name + "' must be constant (" + e + ")");
+ "The expression being assigned to '{0}' must be constant", name);
continue;
}
//
if (children != null){
foreach (Block b in children)
- b.EmitMeta (ec, ip);
+ b.ResolveMeta (toplevel, ec, ip);
+ }
+ ec.InUnsafe = old_unsafe;
+ }
+
+ //
+ // Emits the local variable declarations for a block
+ //
+ public void EmitMeta (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (variables != null){
+ bool have_captured_vars = ec.HaveCapturedVariables ();
+ bool remap_locals = ec.RemapToProxy;
+
+ foreach (DictionaryEntry de in variables){
+ LocalInfo vi = (LocalInfo) de.Value;
+
+ if (have_captured_vars && ec.IsCaptured (vi))
+ continue;
+
+ if (remap_locals){
+ vi.FieldBuilder = ec.MapVariable (vi.Name, vi.VariableType);
+ } else {
+ if (vi.Pinned)
+ //
+ // This is needed to compile on both .NET 1.x and .NET 2.x
+ // the later introduced `DeclareLocal (Type t, bool pinned)'
+ //
+ vi.LocalBuilder = TypeManager.DeclareLocalPinned (ig, vi.VariableType);
+ else if (!vi.IsThis)
+ vi.LocalBuilder = ig.DeclareLocal (vi.VariableType);
+ }
+ }
+ }
+
+ if (children != null){
+ foreach (Block b in children)
+ b.EmitMeta (ec);
}
}
}
bool unreachable_shown;
+ bool unreachable;
public override bool Resolve (EmitContext ec)
{
Report.Debug (4, "RESOLVE BLOCK", StartLocation, ec.CurrentBranching);
- bool unreachable = false;
-
+ //
+ // 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 (unreachable && !(s is LabeledStatement)) {
- if (s == EmptyStatement.Value)
- s.loc = EndLocation;
- if (!s.ResolveUnreachable (ec, !unreachable_shown))
- ok = false;
+ if (unreachable) {
+ if (s is Block)
+ ((Block) s).unreachable = true;
- if (s != EmptyStatement.Value)
+ if (!unreachable_shown && (RootContext.WarningLevel >= 2)) {
+ Report.Warning (
+ 162, loc, "Unreachable code detected");
unreachable_shown = true;
- else
- s.loc = Location.Null;
+ }
+ }
+ if (!s.Resolve (ec)) {
+ ok = false;
statements [ix] = EmptyStatement.Value;
continue;
}
- if (s.Resolve (ec) == false) {
- ok = false;
+ if (unreachable && !(s is LabeledStatement) && !(s is Block))
statements [ix] = EmptyStatement.Value;
- continue;
- }
num_statements = ix + 1;
-
if (s is LabeledStatement)
unreachable = false;
else
public override bool ResolveUnreachable (EmitContext ec, bool warn)
{
unreachable_shown = true;
- return base.ResolveUnreachable (ec, warn);
+ unreachable = true;
+
+ if (warn && (RootContext.WarningLevel >= 2))
+ Report.Warning (162, loc, "Unreachable code detected");
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
+ bool ok = Resolve (ec);
+ ec.KillFlowBranching ();
+
+ return ok;
}
protected override void DoEmit (EmitContext ec)
// Check whether we are the last statement in a
// top-level block.
- if ((Parent == null) && (ix+1 == num_statements))
+ if (((Parent == null) || Implicit) && (ix+1 == num_statements) && !(s is Block))
ec.IsLastStatement = true;
else
ec.IsLastStatement = false;
if (emit_debug_info) {
if (is_lexical_block)
- ec.ig.BeginScope ();
+ ec.BeginScope ();
if (variables != null) {
foreach (DictionaryEntry de in variables) {
ec.Mark (EndLocation, true);
if (emit_debug_info && is_lexical_block)
- ec.ig.EndScope ();
+ ec.EndScope ();
ec.CurrentBlock = prev_block;
}
+
+ //
+ // Returns true if we ar ea child of `b'.
+ //
+ public bool IsChildOf (Block b)
+ {
+ Block current = this;
+
+ do {
+ if (current.Parent == b)
+ return true;
+ current = current.Parent;
+ } while (current != null);
+ return false;
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("{0} ({1}:{2})", GetType (),ID, StartLocation);
+ }
}
//
+ // A toplevel block contains extra information, the split is done
+ // only to separate information that would otherwise bloat the more
+ // lightweight Block.
+ //
+ // In particular, this was introduced when the support for Anonymous
+ // Methods was implemented.
//
public class ToplevelBlock : Block {
+ //
+ // Pointer to the host of this anonymous method, or null
+ // if we are the topmost block
+ //
+ public ToplevelBlock Container;
+ CaptureContext capture_context;
+ FlowBranching top_level_branching;
+
+ Hashtable capture_contexts;
+
+ //
+ // 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;
+ }
+
+ public void CompleteContexts ()
+ {
+ if (capture_contexts == null)
+ return;
+
+ foreach (CaptureContext cc in capture_contexts.Keys){
+ cc.AdjustScopes ();
+ }
+ }
+
+ public CaptureContext ToplevelBlockCaptureContext {
+ get {
+ return capture_context;
+ }
+ }
+
+ //
+ // Parent is only used by anonymous blocks to link back to their
+ // parents
+ //
+ public ToplevelBlock (ToplevelBlock container, Parameters parameters, Location start) :
+ this (container, (Flags) 0, parameters, start)
+ {
+ }
+
public ToplevelBlock (Parameters parameters, Location start) :
- base (null, parameters, start, Location.Null)
+ this (null, (Flags) 0, parameters, start)
{
}
public ToplevelBlock (Flags flags, Parameters parameters, Location start) :
- base (null, flags, parameters, start, Location.Null)
+ this (null, flags, parameters, start)
{
}
- }
-
- public class SwitchLabel {
- Expression label;
- object converted;
- public Location loc;
- public Label ILLabel;
- public Label ILLabelCode;
- //
- // if expr == null, then it is the default case.
- //
- public SwitchLabel (Expression expr, Location l)
+ public ToplevelBlock (ToplevelBlock container, Flags flags, Parameters parameters, Location start) :
+ base (null, flags | Flags.IsToplevel, start, Location.Null)
{
- label = expr;
- loc = l;
+ Parameters = parameters == null ? Parameters.EmptyReadOnlyParameters : parameters;
+ Container = container;
}
- public Expression Label {
+ public ToplevelBlock (Location loc) : this (null, (Flags) 0, null, loc)
+ {
+ }
+
+ public void SetHaveAnonymousMethods (Location loc, AnonymousMethod host)
+ {
+ if (capture_context == null)
+ capture_context = new CaptureContext (this, loc, host);
+ }
+
+ public CaptureContext CaptureContext {
get {
- return label;
+ return capture_context;
}
}
- public object Converted {
+ public FlowBranching TopLevelBranching {
get {
- return converted;
+ return top_level_branching;
}
}
//
- // Resolves the expression, reduces it to a literal if possible
- // and then converts it to the requested type.
+ // Returns a `ParameterReference' for the given name, or null if there
+ // is no such parameter
//
- public bool ResolveAndReduce (EmitContext ec, Type required_type)
+ public ParameterReference GetParameterReference (string name, Location loc)
{
- ILLabel = ec.ig.DefineLabel ();
- ILLabelCode = ec.ig.DefineLabel ();
+ Parameter par;
+ int idx;
- if (label == null)
- return true;
-
- Expression e = label.Resolve (ec);
+ for (ToplevelBlock t = this; t != null; t = t.Container) {
+ Parameters pars = t.Parameters;
+ par = pars.GetParameterByName (name, out idx);
+ if (par != null)
+ return new ParameterReference (pars, this, idx, name, loc);
+ }
+ return null;
+ }
- if (e == null)
+ //
+ // Whether the parameter named `name' is local to this block,
+ // or false, if the parameter belongs to an encompassing block.
+ //
+ public bool IsLocalParameter (string name)
+ {
+ return Parameters.GetParameterByName (name) != null;
+ }
+
+ //
+ // Whether the `name' is a parameter reference
+ //
+ public bool IsParameterReference (string name)
+ {
+ Parameter par;
+ int idx;
+
+ for (ToplevelBlock t = this; t != null; t = t.Container) {
+ if (t.IsLocalParameter (name))
+ return true;
+ }
+ return false;
+ }
+
+ public bool ResolveMeta (EmitContext ec, InternalParameters ip)
+ {
+ int errors = Report.Errors;
+
+ if (top_level_branching != null)
+ return true;
+
+ ResolveMeta (this, ec, ip);
+
+ top_level_branching = ec.StartFlowBranching (this);
+
+ return Report.Errors == errors;
+ }
+ }
+
+ public class SwitchLabel {
+ Expression label;
+ object converted;
+ public Location loc;
+
+ Label il_label;
+ bool il_label_set;
+ Label il_label_code;
+ bool il_label_code_set;
+
+ //
+ // if expr == null, then it is the default case.
+ //
+ public SwitchLabel (Expression expr, Location l)
+ {
+ label = expr;
+ loc = l;
+ }
+
+ public Expression Label {
+ get {
+ return label;
+ }
+ }
+
+ public object Converted {
+ get {
+ return converted;
+ }
+ }
+
+ public Label GetILLabel (EmitContext ec)
+ {
+ if (!il_label_set){
+ il_label = ec.ig.DefineLabel ();
+ il_label_set = true;
+ }
+ return il_label;
+ }
+
+ public Label GetILLabelCode (EmitContext ec)
+ {
+ if (!il_label_code_set){
+ il_label_code = ec.ig.DefineLabel ();
+ il_label_code_set = true;
+ }
+ return il_label_code;
+ }
+
+ //
+ // 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)
+ {
+ if (label == null)
+ return true;
+
+ Expression e = label.Resolve (ec);
+
+ if (e == null)
return false;
if (!(e is Constant)){
if (e is StringConstant || e is NullLiteral){
if (required_type == TypeManager.string_type){
converted = e;
- ILLabel = ec.ig.DefineLabel ();
return true;
}
}
//
// Computed
//
- bool got_default;
Label default_target;
Expression new_expr;
bool is_constant;
SwitchSection constant_section;
+ SwitchSection default_section;
//
// The types allowed to be implicitly cast from
public bool GotDefault {
get {
- return got_default;
+ return default_section != null;
}
}
if (allowed_types == null){
allowed_types = new Type [] {
+ TypeManager.int32_type,
+ TypeManager.uint32_type,
TypeManager.sbyte_type,
TypeManager.byte_type,
TypeManager.short_type,
TypeManager.ushort_type,
- TypeManager.int32_type,
- TypeManager.uint32_type,
TypeManager.int64_type,
TypeManager.uint64_type,
TypeManager.char_type,
if (e == null)
continue;
+ //
+ // Ignore over-worked ImplicitUserConversions that do
+ // an implicit conversion in addition to the user conversion.
+ //
+ if (e is UserCast){
+ UserCast ue = e as UserCast;
+
+ if (ue.Source != Expr)
+ e = null;
+ }
+
if (converted != null){
- Report.Error (-12, loc, "More than one conversion to an integral " +
- " type exists for type `" +
- TypeManager.CSharpName (Expr.Type)+"'");
+ Report.ExtraInformation (
+ loc,
+ String.Format ("reason: more than one conversion to an integral type exist for type {0}",
+ TypeManager.CSharpName (Expr.Type)));
return null;
- } else
+ } else {
converted = e;
+ }
}
return converted;
}
bool error = false;
Elements = new Hashtable ();
- got_default = false;
-
if (TypeManager.IsEnumType (SwitchType)){
compare_type = TypeManager.EnumToUnderlying (SwitchType);
} else
}
if (sl.Label == null){
- if (got_default){
+ if (default_section != null){
Report.Error (152, sl.loc, Error152, "default");
error = true;
}
- got_default = true;
+ default_section = ss;
continue;
}
ig.Emit (OpCodes.Ldloc, val);
EmitObjectInteger (ig, key);
SwitchLabel sl = (SwitchLabel) Elements [key];
- ig.Emit (OpCodes.Beq, sl.ILLabel);
+ ig.Emit (OpCodes.Beq, sl.GetILLabel (ec));
}
}
else
if (System.Convert.ToInt64 (key) == kb.nFirst + iJump)
{
SwitchLabel sl = (SwitchLabel) Elements [key];
- rgLabels [iJump] = sl.ILLabel;
+ rgLabels [iJump] = sl.GetILLabel (ec);
iKey++;
}
else
{
foreach (SwitchLabel sl in ss.Labels)
{
- ig.MarkLabel (sl.ILLabel);
- ig.MarkLabel (sl.ILLabelCode);
+ ig.MarkLabel (sl.GetILLabel (ec));
+ ig.MarkLabel (sl.GetILLabelCode (ec));
if (sl.Label == null)
{
ig.MarkLabel (lblDefault);
Label end_of_switch = ig.DefineLabel ();
Label next_test = ig.DefineLabel ();
Label null_target = ig.DefineLabel ();
- bool default_found = false;
bool first_test = true;
bool pending_goto_end = false;
+ bool null_marked = false;
bool null_found;
- bool default_at_end = false;
-
+
ig.Emit (OpCodes.Ldloc, val);
if (Elements.Contains (NullLiteral.Null)){
ig.Emit (OpCodes.Ldloc, val);
ig.Emit (OpCodes.Call, TypeManager.string_isinterneted_string);
ig.Emit (OpCodes.Stloc, val);
-
+
int section_count = Sections.Count;
for (int section = 0; section < section_count; section++){
SwitchSection ss = (SwitchSection) Sections [section];
+
+ if (ss == default_section)
+ continue;
+
Label sec_begin = ig.DefineLabel ();
+ ig.Emit (OpCodes.Nop);
+
if (pending_goto_end)
ig.Emit (OpCodes.Br, end_of_switch);
int label_count = ss.Labels.Count;
- bool mark_default = false;
null_found = false;
for (int label = 0; label < label_count; label++){
SwitchLabel sl = (SwitchLabel) ss.Labels [label];
- ig.MarkLabel (sl.ILLabel);
+ ig.MarkLabel (sl.GetILLabel (ec));
if (!first_test){
ig.MarkLabel (next_test);
//
// If we are the default target
//
- if (sl.Label == null){
- if (label+1 == label_count)
- default_at_end = true;
- mark_default = true;
- default_found = true;
- } else {
+ if (sl.Label != null){
object lit = sl.Converted;
if (lit is NullLiteral){
}
}
}
- if (null_found)
+ if (null_found) {
ig.MarkLabel (null_target);
+ null_marked = true;
+ }
ig.MarkLabel (sec_begin);
foreach (SwitchLabel sl in ss.Labels)
- ig.MarkLabel (sl.ILLabelCode);
+ ig.MarkLabel (sl.GetILLabelCode (ec));
- if (mark_default)
- ig.MarkLabel (default_target);
ss.Block.Emit (ec);
pending_goto_end = !ss.Block.HasRet;
first_test = false;
}
ig.MarkLabel (next_test);
- if (default_found){
- if (!default_at_end)
- ig.Emit (OpCodes.Br, default_target);
- } else
- ig.MarkLabel (default_target);
+ ig.MarkLabel (default_target);
+ if (!null_marked)
+ ig.MarkLabel (null_target);
+ if (default_section != null)
+ default_section.Block.Emit (ec);
ig.MarkLabel (end_of_switch);
}
return null;
}
- bool ResolveConstantSwitch (EmitContext ec)
- {
- object key = ((Constant) new_expr).GetValue ();
- SwitchLabel label = (SwitchLabel) Elements [key];
-
- if (label == null)
- return true;
-
- constant_section = FindSection (label);
- if (constant_section == null)
- return true;
-
- if (constant_section.Block.Resolve (ec) != true)
- return false;
-
- return true;
- }
-
public override bool Resolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
SwitchLabel label = (SwitchLabel) Elements [key];
constant_section = FindSection (label);
+ if (constant_section == null)
+ constant_section = default_section;
}
bool first = true;
return false;
} else {
if (!ss.Block.Resolve (ec))
- return false;
+ return false;
}
}
- if (!got_default)
+ if (default_section == null)
ec.CurrentBranching.CreateSibling (
null, FlowBranching.SiblingType.SwitchSection);
public Unsafe (Block b)
{
Block = b;
+ Block.Unsafe = true;
}
public override bool Resolve (EmitContext ec)
ArrayList declarators;
Statement statement;
Type expr_type;
- FixedData[] data;
+ Emitter[] data;
bool has_ret;
- struct FixedData {
- public bool is_object;
- public LocalInfo vi;
- public Expression expr;
- public Expression converted;
- }
+ abstract class Emitter
+ {
+ protected LocalInfo vi;
+ protected Expression converted;
+
+ protected Emitter (Expression expr, LocalInfo li)
+ {
+ converted = expr;
+ vi = li;
+ }
+
+ public abstract void Emit (EmitContext ec);
+ public abstract void EmitExit (ILGenerator ig);
+ }
+
+ class ExpressionEmitter: Emitter {
+ public ExpressionEmitter (Expression converted, LocalInfo li) :
+ base (converted, li)
+ {
+ }
+
+ public override void Emit (EmitContext ec) {
+ //
+ // Store pointer in pinned location
+ //
+ converted.Emit (ec);
+ ec.ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ }
+
+ public override void EmitExit (ILGenerator ig)
+ {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Conv_U);
+ ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ }
+ }
+
+ class StringEmitter: Emitter {
+ LocalBuilder pinned_string;
+ Location loc;
+
+ public StringEmitter (Expression expr, LocalInfo li, Location loc):
+ base (expr, li)
+ {
+ this.loc = loc;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ pinned_string = TypeManager.DeclareLocalPinned (ig, TypeManager.string_type);
+
+ converted.Emit (ec);
+ ig.Emit (OpCodes.Stloc, pinned_string);
+
+ Expression sptr = new StringPtr (pinned_string, loc);
+ converted = Convert.ImplicitConversionRequired (
+ ec, sptr, vi.VariableType, loc);
+
+ if (converted == null)
+ return;
+
+ converted.Emit (ec);
+ ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+ }
+
+ public override void EmitExit(ILGenerator ig)
+ {
+ ig.Emit (OpCodes.Ldnull);
+ ig.Emit (OpCodes.Stloc, pinned_string);
+ }
+ }
public Fixed (Expression type, ArrayList decls, Statement stmt, Location l)
{
return false;
}
- expr_type = ec.DeclSpace.ResolveType (type, false, loc);
- if (expr_type == null)
+ TypeExpr texpr = type.ResolveAsTypeTerminal (ec);
+ if (texpr == null)
return false;
+ expr_type = texpr.Type;
+
CheckObsolete (expr_type);
if (ec.RemapToProxy){
return false;
}
- data = new FixedData [declarators.Count];
+ data = new Emitter [declarators.Count];
if (!expr_type.IsPointer){
Report.Error (209, loc, "Variables in a fixed statement must be pointers");
Expression e = (Expression) p.Second;
vi.VariableInfo.SetAssigned (ec);
- vi.ReadOnly = true;
+ vi.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Fixed);
//
// The rules for the possible declarators are pretty wise,
if (!TypeManager.VerifyUnManaged (child.Type, loc))
return false;
- data [i].is_object = true;
- data [i].expr = e;
- data [i].converted = null;
- data [i].vi = vi;
+ data [i] = new ExpressionEmitter (e, vi);
i++;
continue;
// and T* is implicitly convertible to the
// pointer type given in the fixed statement.
//
- ArrayPtr array_ptr = new ArrayPtr (e, loc);
+ ArrayPtr array_ptr = new ArrayPtr (e, array_type, loc);
Expression converted = Convert.ImplicitConversionRequired (
ec, array_ptr, vi.VariableType, loc);
if (converted == null)
return false;
- data [i].is_object = false;
- data [i].expr = e;
- data [i].converted = converted;
- data [i].vi = vi;
+ data [i] = new ExpressionEmitter (converted, vi);
i++;
continue;
// Case 3: string
//
if (e.Type == TypeManager.string_type){
- data [i].is_object = false;
- data [i].expr = e;
- data [i].converted = null;
- data [i].vi = vi;
+ data [i] = new StringEmitter (e, vi, loc);
i++;
continue;
}
+ // Case 4: fixed buffer
+ FieldExpr fe = e as FieldExpr;
+ if (fe != null) {
+ IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
+ if (ff != null) {
+ Expression fixed_buffer_ptr = new FixedBufferPtr (fe, ff.ElementType, loc);
+
+ Expression converted = Convert.ImplicitConversionRequired (
+ ec, fixed_buffer_ptr, vi.VariableType, loc);
+ if (converted == null)
+ return false;
+
+ data [i] = new ExpressionEmitter (converted, vi);
+ i++;
+
+ continue;
+ }
+ }
+
//
// For other cases, flag a `this is already fixed expression'
//
protected override void DoEmit (EmitContext ec)
{
- ILGenerator ig = ec.ig;
-
- LocalBuilder [] clear_list = new LocalBuilder [data.Length];
-
for (int i = 0; i < data.Length; i++) {
- LocalInfo vi = data [i].vi;
-
- //
- // Case 1: & object.
- //
- if (data [i].is_object) {
- //
- // Store pointer in pinned location
- //
- data [i].expr.Emit (ec);
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
- clear_list [i] = vi.LocalBuilder;
- continue;
- }
-
- //
- // Case 2: Array
- //
- if (data [i].expr.Type.IsArray){
- //
- // Store pointer in pinned location
- //
- data [i].converted.Emit (ec);
-
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
- clear_list [i] = vi.LocalBuilder;
- continue;
- }
-
- //
- // Case 3: string
- //
- if (data [i].expr.Type == TypeManager.string_type){
- LocalBuilder pinned_string = TypeManager.DeclareLocalPinned (ig, TypeManager.string_type);
- clear_list [i] = pinned_string;
-
- data [i].expr.Emit (ec);
- ig.Emit (OpCodes.Stloc, pinned_string);
-
- Expression sptr = new StringPtr (pinned_string, loc);
- Expression converted = Convert.ImplicitConversionRequired (
- ec, sptr, vi.VariableType, loc);
-
- if (converted == null)
- continue;
-
- converted.Emit (ec);
- ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
- }
+ data [i].Emit (ec);
}
statement.Emit (ec);
if (has_ret)
return;
+ ILGenerator ig = ec.ig;
+
//
// Clear the pinned variable
//
for (int i = 0; i < data.Length; i++) {
- if (data [i].is_object || data [i].expr.Type.IsArray) {
- ig.Emit (OpCodes.Ldc_I4_0);
- ig.Emit (OpCodes.Conv_U);
- ig.Emit (OpCodes.Stloc, clear_list [i]);
- } else if (data [i].expr.Type == TypeManager.string_type){
- ig.Emit (OpCodes.Ldnull);
- ig.Emit (OpCodes.Stloc, clear_list [i]);
- }
+ data [i].EmitExit (ig);
}
}
}
public override bool Resolve (EmitContext ec)
{
- if (type_expr != null) {
- type = ec.DeclSpace.ResolveType (type_expr, false, loc);
- if (type == null)
- return false;
+ bool was_catch = ec.InCatch;
+ ec.InCatch = true;
+ try {
+ if (type_expr != null) {
+ TypeExpr te = type_expr.ResolveAsTypeTerminal (ec);
+ if (te == null)
+ return false;
- CheckObsolete (type);
+ type = te.ResolveType (ec);
- if (type != TypeManager.exception_type && !type.IsSubclassOf (TypeManager.exception_type)){
- Error (155, "The type caught or thrown must be derived from System.Exception");
- return false;
- }
- } else
- type = null;
+ CheckObsolete (type);
- return Block.Resolve (ec);
+ if (type != TypeManager.exception_type && !type.IsSubclassOf (TypeManager.exception_type)){
+ Error (155, "The type caught or thrown must be derived from System.Exception");
+ return false;
+ }
+ } else
+ type = null;
+
+ return Block.Resolve (ec);
+ }
+ finally {
+ ec.InCatch = was_catch;
+ }
}
}
Fini, FlowBranching.SiblingType.Finally);
Report.Debug (1, "STARTED SIBLING FOR FINALLY", ec.CurrentBranching, vector);
-
+ bool was_finally = ec.InFinally;
+ ec.InFinally = true;
if (!Fini.Resolve (ec))
ok = false;
+ ec.InFinally = was_finally;
}
ResolveFinally (branching);
Fini.Emit (ec);
}
}
+
+ public bool HasCatch
+ {
+ get {
+ return General != null || Specific.Count > 0;
+ }
+ }
}
public class Using : ExceptionStatement {
//
bool ResolveLocalVariableDecls (EmitContext ec)
{
- expr_type = ec.DeclSpace.ResolveType (expr, false, loc);
int i = 0;
- if (expr_type == null)
+ TypeExpr texpr = expr.ResolveAsTypeTerminal (ec);
+ if (texpr == null)
return false;
+ expr_type = texpr.Type;
+
//
// The type must be an IDisposable or an implicit conversion
// must exist.
bool ResolveExpression (EmitContext ec)
{
if (!TypeManager.ImplementsInterface (expr_type, TypeManager.idisposable_type)){
- conv = Convert.ImplicitConversionRequired (
- ec, expr, TypeManager.idisposable_type, loc);
-
- if (conv == null)
+ if (Convert.ImplicitConversion (ec, expr, TypeManager.idisposable_type, loc) == null) {
+ Report.Error (1674, loc, "'{0}': type used in a using statement must be implicitly convertible to 'System.IDisposable'",
+ TypeManager.CSharpName (expr_type));
return false;
+ }
}
return true;
ILGenerator ig = ec.ig;
int i = assign.Length;
- foreach (DictionaryEntry e in var_list){
+ for (int ii = 0; ii < var_list.Count; ++ii){
Expression var = resolved_vars [--i];
Label skip = ig.DefineLabel ();
void EmitExpressionFinally (EmitContext ec)
{
ILGenerator ig = ec.ig;
- Label skip = ig.DefineLabel ();
- ig.Emit (OpCodes.Ldloc, local_copy);
- ig.Emit (OpCodes.Brfalse, skip);
- ig.Emit (OpCodes.Ldloc, local_copy);
- ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
- ig.MarkLabel (skip);
+ if (!local_copy.LocalType.IsValueType) {
+ Label skip = ig.DefineLabel ();
+ ig.Emit (OpCodes.Ldloc, local_copy);
+ ig.Emit (OpCodes.Brfalse, skip);
+ ig.Emit (OpCodes.Ldloc, local_copy);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ ig.MarkLabel (skip);
+ } else {
+ Expression ml = Expression.MemberLookup(ec, TypeManager.idisposable_type, local_copy.LocalType, "Dispose", Mono.CSharp.Location.Null);
+
+ if (!(ml is MethodGroupExpr)) {
+ ig.Emit (OpCodes.Ldloc, local_copy);
+ ig.Emit (OpCodes.Box, local_copy.LocalType);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ } else {
+ MethodInfo mi = null;
+
+ foreach (MethodInfo mk in ((MethodGroupExpr) ml).Methods) {
+ if (TypeManager.GetArgumentTypes (mk).Length == 0) {
+ mi = mk;
+ break;
+ }
+ }
+
+ if (mi == null) {
+ Report.Error(-100, Mono.CSharp.Location.Null, "Internal error: No Dispose method which takes 0 parameters.");
+ return;
+ }
+
+ ig.Emit (OpCodes.Ldloca, local_copy);
+ ig.Emit (OpCodes.Call, mi);
+ }
+ }
}
public override bool Resolve (EmitContext ec)
Type array_type, element_type;
Type var_type;
VariableStorage enumerator;
+ ArrayForeach array;
public Foreach (Expression type, LocalVariableReference var, Expression expr,
Statement stmt, Location l)
if (expr == null)
return false;
- var_type = ec.DeclSpace.ResolveType (type, false, loc);
- if (var_type == null)
+ if (expr is NullLiteral) {
+ Report.Error (186, expr.Location, "Use of null is not valid in this context");
+ return false;
+ }
+
+ TypeExpr texpr = type.ResolveAsTypeTerminal (ec);
+ if (texpr == null)
return false;
+ var_type = texpr.Type;
+
//
// We need an instance variable. Not sure this is the best
// way of doing this.
element_type = TypeManager.GetElementType (array_type);
empty = new EmptyExpression (element_type);
+
+ array = new ArrayForeach (type, variable, expr, statement, loc);
+ return array.Resolve (ec);
} else {
hm = ProbeCollectionType (ec, expr.Type);
if (hm == null){
args = TypeManager.GetArgumentTypes (mi);
if (args != null && args.Length == 0){
- if (mi.ReturnType == TypeManager.bool_type)
+ if (TypeManager.TypeToCoreType (mi.ReturnType) == TypeManager.bool_type)
return mi;
}
}
{
if (m == null)
return false;
-
+
if (!(m is MethodInfo))
return false;
return false;
}
ForeachHelperMethods hm = (ForeachHelperMethods) criteria;
- EmitContext ec = hm.ec;
// Check whether GetEnumerator is public
if ((mi.Attributes & MethodAttributes.Public) != MethodAttributes.Public)
// Ok, we can access it, now make sure that we can do something
// with this `GetEnumerator'
//
-
+
Type return_type = mi.ReturnType;
if (mi.ReturnType == TypeManager.ienumerator_type ||
TypeManager.ienumerator_type.IsAssignableFrom (return_type) ||
ig.Emit (OpCodes.Brfalse, end_try);
if (ec.InIterator)
- enumerator.EmitThis (ig);
+ ig.Emit (OpCodes.Ldarg_0);
+
enumerator.EmitCall (ig, hm.get_current);
if (ec.InIterator){
conv.Emit (ec);
- ig.Emit (OpCodes.Stfld, ((FieldExpr) variable).FieldInfo);
+ ig.Emit (OpCodes.Stfld, ((LocalVariableReference) variable).local_info.FieldBuilder);
} else
((IAssignMethod)variable).EmitAssign (ec, conv, false, false);
}
}
- //
- // FIXME: possible optimization.
- // We might be able to avoid creating `empty' if the type is the sam
- //
- bool EmitArrayForeach (EmitContext ec)
+ protected override void DoEmit (EmitContext ec)
{
- int rank = array_type.GetArrayRank ();
ILGenerator ig = ec.ig;
-
- VariableStorage copy = new VariableStorage (ec, array_type);
- //
- // Make our copy of the array
- //
- copy.EmitThis (ig);
- expr.Emit (ec);
- copy.EmitStore (ig);
+ Label old_begin = ec.LoopBegin, old_end = ec.LoopEnd;
+ ec.LoopBegin = ig.DefineLabel ();
+ ec.LoopEnd = ig.DefineLabel ();
- if (rank == 1){
- VariableStorage counter = new VariableStorage (ec,TypeManager.int32_type);
+ if (hm != null)
+ EmitCollectionForeach (ec);
+ else
+ array.Emit (ec);
+
+ ec.LoopBegin = old_begin;
+ ec.LoopEnd = old_end;
+ }
- Label loop, test;
+ protected class TemporaryVariable : Expression
+ {
+ FieldBuilder fb;
+ LocalBuilder local;
- counter.EmitThis (ig);
- ig.Emit (OpCodes.Ldc_I4_0);
- counter.EmitStore (ig);
- test = ig.DefineLabel ();
- ig.Emit (OpCodes.Br, test);
+ public TemporaryVariable (Type type, Location loc)
+ {
+ this.type = type;
+ this.loc = loc;
+ eclass = ExprClass.Value;
+ }
- loop = ig.DefineLabel ();
- ig.MarkLabel (loop);
+ static int count;
- if (ec.InIterator)
- ec.EmitThis ();
-
- copy.EmitThis (ig);
- copy.EmitLoad (ig);
- counter.EmitThis (ig);
- counter.EmitLoad (ig);
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (ec.InIterator) {
+ count++;
+ fb = ec.CurrentIterator.MapVariable (
+ "s_", count.ToString (), type);
+ } else
+ local = ec.ig.DeclareLocal (type);
- //
- // Load the value, we load the value using the underlying type,
- // then we use the variable.EmitAssign to load using the proper cast.
- //
- ArrayAccess.EmitLoadOpcode (ig, element_type);
- if (ec.InIterator){
- conv.Emit (ec);
- ig.Emit (OpCodes.Stfld, ((FieldExpr) variable).FieldInfo);
- } else
- ((IAssignMethod)variable).EmitAssign (ec, conv, false, false);
+ return this;
+ }
- statement.Emit (ec);
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
- ig.MarkLabel (ec.LoopBegin);
- counter.EmitThis (ig);
- counter.EmitThis (ig);
- counter.EmitLoad (ig);
- ig.Emit (OpCodes.Ldc_I4_1);
- ig.Emit (OpCodes.Add);
- counter.EmitStore (ig);
-
- ig.MarkLabel (test);
- counter.EmitThis (ig);
- counter.EmitLoad (ig);
- copy.EmitThis (ig);
- copy.EmitLoad (ig);
- ig.Emit (OpCodes.Ldlen);
- ig.Emit (OpCodes.Conv_I4);
- ig.Emit (OpCodes.Blt, loop);
- } else {
- VariableStorage [] dim_len = new VariableStorage [rank];
- VariableStorage [] dim_count = new VariableStorage [rank];
- Label [] loop = new Label [rank];
- Label [] test = new Label [rank];
- int dim;
-
- for (dim = 0; dim < rank; dim++){
- dim_len [dim] = new VariableStorage (ec, TypeManager.int32_type);
- dim_count [dim] = new VariableStorage (ec, TypeManager.int32_type);
- test [dim] = ig.DefineLabel ();
- loop [dim] = ig.DefineLabel ();
+ if (fb != null) {
+ ig.Emit (OpCodes.Ldarg_0);
+ ig.Emit (OpCodes.Ldfld, fb);
+ } else {
+ ig.Emit (OpCodes.Ldloc, local);
}
-
- for (dim = 0; dim < rank; dim++){
- dim_len [dim].EmitThis (ig);
- copy.EmitThis (ig);
- copy.EmitLoad (ig);
- IntLiteral.EmitInt (ig, dim);
- ig.Emit (OpCodes.Callvirt, TypeManager.int_getlength_int);
- dim_len [dim].EmitStore (ig);
-
+ }
+
+ public void Store (EmitContext ec, Expression right_side)
+ {
+ if (fb != null)
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ right_side.Emit (ec);
+ if (fb == null)
+ ec.ig.Emit (OpCodes.Stloc, local);
+ else
+ ec.ig.Emit (OpCodes.Stfld, fb);
+ }
+
+ public void EmitThis (ILGenerator ig)
+ {
+ if (fb != null)
+ ig.Emit (OpCodes.Ldarg_0);
+ }
+
+ public void EmitStore (ILGenerator ig)
+ {
+ if (fb == null)
+ ig.Emit (OpCodes.Stloc, local);
+ else
+ ig.Emit (OpCodes.Stfld, fb);
+ }
+ }
+
+ protected class ArrayCounter : TemporaryVariable
+ {
+ public ArrayCounter (Location loc)
+ : base (TypeManager.int32_type, loc)
+ { }
+
+ public void Initialize (EmitContext ec)
+ {
+ EmitThis (ec.ig);
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+ EmitStore (ec.ig);
+ }
+
+ public void Increment (EmitContext ec)
+ {
+ EmitThis (ec.ig);
+ Emit (ec);
+ ec.ig.Emit (OpCodes.Ldc_I4_1);
+ ec.ig.Emit (OpCodes.Add);
+ EmitStore (ec.ig);
+ }
+ }
+
+ protected class ArrayForeach : Statement
+ {
+ Expression type, variable, expr, conv;
+ Statement statement;
+ Type array_type;
+ Type var_type;
+ TemporaryVariable[] lengths;
+ ArrayCounter[] counter;
+ int rank;
+
+ TemporaryVariable copy;
+ Expression access;
+
+ public ArrayForeach (Expression type, Expression var,
+ Expression expr, Statement stmt, Location l)
+ {
+ this.type = type;
+ this.variable = var;
+ this.expr = expr;
+ statement = stmt;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ TypeExpr texpr = type.ResolveAsTypeTerminal (ec);
+ if (texpr == null)
+ return false;
+
+ var_type = texpr.Type;
+
+ array_type = expr.Type;
+ rank = array_type.GetArrayRank ();
+
+ copy = new TemporaryVariable (array_type, loc);
+ copy.Resolve (ec);
+
+ counter = new ArrayCounter [rank];
+ lengths = new TemporaryVariable [rank];
+
+ ArrayList list = new ArrayList ();
+ for (int i = 0; i < rank; i++) {
+ counter [i] = new ArrayCounter (loc);
+ counter [i].Resolve (ec);
+
+ lengths [i] = new TemporaryVariable (TypeManager.int32_type, loc);
+ lengths [i].Resolve (ec);
+
+ list.Add (counter [i]);
}
- for (dim = 0; dim < rank; dim++){
- dim_count [dim].EmitThis (ig);
- ig.Emit (OpCodes.Ldc_I4_0);
- dim_count [dim].EmitStore (ig);
- ig.Emit (OpCodes.Br, test [dim]);
- ig.MarkLabel (loop [dim]);
+ access = new ElementAccess (copy, list, loc).Resolve (ec);
+ if (access == null)
+ return false;
+
+ conv = Convert.ExplicitConversion (ec, access, var_type, loc);
+ if (conv == null)
+ return false;
+
+ bool ok = true;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+ ec.CurrentBranching.CreateSibling ();
+
+ variable = variable.ResolveLValue (ec, conv);
+ if (variable == null)
+ ok = false;
+
+ if (!statement.Resolve (ec))
+ ok = false;
+
+ ec.EndFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ copy.Store (ec, expr);
+
+ Label[] test = new Label [rank];
+ Label[] loop = new Label [rank];
+
+ for (int i = 0; i < rank; i++) {
+ test [i] = ig.DefineLabel ();
+ loop [i] = ig.DefineLabel ();
+
+ lengths [i].EmitThis (ig);
+ ((ArrayAccess) access).EmitGetLength (ec, i);
+ lengths [i].EmitStore (ig);
}
- if (ec.InIterator)
- ec.EmitThis ();
- copy.EmitThis (ig);
- copy.EmitLoad (ig);
- for (dim = 0; dim < rank; dim++){
- dim_count [dim].EmitThis (ig);
- dim_count [dim].EmitLoad (ig);
+ for (int i = 0; i < rank; i++) {
+ counter [i].Initialize (ec);
+
+ ig.Emit (OpCodes.Br, test [i]);
+ ig.MarkLabel (loop [i]);
}
- //
- // FIXME: Maybe we can cache the computation of `get'?
- //
- Type [] args = new Type [rank];
- MethodInfo get;
-
- for (int i = 0; i < rank; i++)
- args [i] = TypeManager.int32_type;
-
- ModuleBuilder mb = CodeGen.Module.Builder;
- get = mb.GetArrayMethod (
- array_type, "Get",
- CallingConventions.HasThis| CallingConventions.Standard,
- var_type, args);
- ig.Emit (OpCodes.Call, get);
- if (ec.InIterator){
- conv.Emit (ec);
- ig.Emit (OpCodes.Stfld, ((FieldExpr) variable).FieldInfo);
- } else
- ((IAssignMethod)variable).EmitAssign (ec, conv, false, false);
+ ((IAssignMethod) variable).EmitAssign (ec, conv, false, false);
+
statement.Emit (ec);
+
ig.MarkLabel (ec.LoopBegin);
- for (dim = rank - 1; dim >= 0; dim--){
- dim_count [dim].EmitThis (ig);
- dim_count [dim].EmitThis (ig);
- dim_count [dim].EmitLoad (ig);
- ig.Emit (OpCodes.Ldc_I4_1);
- ig.Emit (OpCodes.Add);
- dim_count [dim].EmitStore (ig);
-
- ig.MarkLabel (test [dim]);
- dim_count [dim].EmitThis (ig);
- dim_count [dim].EmitLoad (ig);
- dim_len [dim].EmitThis (ig);
- dim_len [dim].EmitLoad (ig);
- ig.Emit (OpCodes.Blt, loop [dim]);
+
+ for (int i = rank - 1; i >= 0; i--){
+ counter [i].Increment (ec);
+
+ ig.MarkLabel (test [i]);
+ counter [i].Emit (ec);
+ lengths [i].Emit (ec);
+ ig.Emit (OpCodes.Blt, loop [i]);
}
+
+ ig.MarkLabel (ec.LoopEnd);
}
- ig.MarkLabel (ec.LoopEnd);
-
- return false;
- }
-
- protected override void DoEmit (EmitContext ec)
- {
- ILGenerator ig = ec.ig;
-
- Label old_begin = ec.LoopBegin, old_end = ec.LoopEnd;
- ec.LoopBegin = ig.DefineLabel ();
- ec.LoopEnd = ig.DefineLabel ();
-
- if (hm != null)
- EmitCollectionForeach (ec);
- else
- EmitArrayForeach (ec);
-
- ec.LoopBegin = old_begin;
- ec.LoopEnd = old_end;
}
}
}
projects / mono.git / blobdiff