//
// Author:
// Martin Baulig (martin@ximian.com)
+// Raja R Harinath (rharinath@novell.com)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
//
child.Type, child.Reachability.IsUnreachable, unreachable);
if (!unreachable)
- MyBitVector.And (ref locals, child.locals);
+ locals &= child.locals;
// An `out' parameter must be assigned in all branches which do
// not always throw an exception.
if (!child.Reachability.AlwaysThrows)
- MyBitVector.And (ref parameters, child.parameters);
+ parameters &= child.parameters;
Report.Debug (2, " MERGING SIBLING #2", parameters, locals);
}
// <summary>
// Merges a child branching.
// </summary>
- public UsageVector MergeChild (UsageVector child, bool implicit_block)
+ public UsageVector MergeChild (UsageVector child, bool overwrite)
{
Report.Debug (2, " MERGING CHILD EFFECTS", this, child, reachability, Type);
return child;
}
- MyBitVector.Or (ref locals, child.locals);
- MyBitVector.Or (ref parameters, child.parameters);
+ locals |= child.locals;
+ parameters |= child.parameters;
- if (implicit_block)
+ if (overwrite)
reachability = new_r.Clone ();
else
reachability.Or (new_r);
for (UsageVector vector = o_vectors; vector != null; vector = vector.Next) {
Report.Debug (1, " MERGING BREAK ORIGIN", vector);
- MyBitVector.And (ref locals, vector.locals);
- MyBitVector.And (ref parameters, vector.parameters);
+ if (vector.Reachability.IsUnreachable)
+ continue;
+ locals &= vector.locals;
+ parameters &= vector.parameters;
reachability.Meet (vector.Reachability);
}
protected abstract void AddSibling (UsageVector uv);
- public virtual LabeledStatement LookupLabel (string name, Location loc)
- {
- return Parent.LookupLabel (name, loc);
- }
-
- public abstract void Label (UsageVector origin_vectors);
-
protected abstract UsageVector Merge ();
// <summary>
// </summary>
public UsageVector MergeChild (FlowBranching child)
{
- bool implicit_block = child.Type == BranchingType.Block && child.Block.Implicit;
+ bool overwrite = child.Type == BranchingType.Labeled ||
+ (child.Type == BranchingType.Block && child.Block.Implicit);
Report.Debug (2, " MERGING CHILD", this, child);
- UsageVector result = CurrentUsageVector.MergeChild (child.Merge (), implicit_block);
+ UsageVector result = CurrentUsageVector.MergeChild (child.Merge (), overwrite);
Report.Debug (2, " MERGING CHILD DONE", this, result);
return result;
}
return Parent.AddReturnOrigin (vector, loc);
}
+ // returns true if we crossed an unwind-protected region (try/catch/finally, lock, using, ...)
+ public virtual bool AddGotoOrigin (UsageVector vector, Goto goto_stmt)
+ {
+ return Parent.AddGotoOrigin (vector, goto_stmt);
+ }
+
public virtual void StealFinallyClauses (ref ArrayList list)
{
Parent.StealFinallyClauses (ref list);
sibling_list = sibling;
}
- public override LabeledStatement LookupLabel (string name, Location loc)
+ public override bool AddGotoOrigin (UsageVector vector, Goto goto_stmt)
{
- LabeledStatement stmt = Block == null ? null : Block.LookupLabel (name);
+ LabeledStatement stmt = Block == null ? null : Block.LookupLabel (goto_stmt.Target);
if (stmt == null)
- return Parent.LookupLabel (name, loc);
-
- stmt.AddReference ();
- return stmt;
- }
-
- public override void Label (UsageVector origin_vectors)
- {
- if (!CurrentUsageVector.Reachability.IsUnreachable) {
- UsageVector vector = CurrentUsageVector.Clone ();
- vector.Next = origin_vectors;
- origin_vectors = vector;
- }
+ return Parent.AddGotoOrigin (vector, goto_stmt);
- CurrentUsageVector.MergeOrigins (origin_vectors);
+ // forward jump
+ goto_stmt.SetResolvedTarget (stmt);
+ stmt.AddUsageVector (vector);
+ return false;
}
protected override UsageVector Merge ()
public class FlowBranchingLabeled : FlowBranchingBlock
{
LabeledStatement stmt;
+ UsageVector actual;
+
public FlowBranchingLabeled (FlowBranching parent, LabeledStatement stmt)
: base (parent, BranchingType.Labeled, SiblingType.Conditional, null, stmt.loc)
{
this.stmt = stmt;
+ CurrentUsageVector.MergeOrigins (stmt.JumpOrigins);
+ actual = CurrentUsageVector.Clone ();
+
+ // stand-in for backward jumps
+ CurrentUsageVector.Reachability.Meet (Reachability.Always ());
+ }
+
+ public override bool AddGotoOrigin (UsageVector vector, Goto goto_stmt)
+ {
+ if (goto_stmt.Target != stmt.Name)
+ return Parent.AddGotoOrigin (vector, goto_stmt);
+
+ // backward jump
+ goto_stmt.SetResolvedTarget (stmt);
+ actual.MergeOrigins (vector.Clone ());
+
+ return false;
}
- public override LabeledStatement LookupLabel (string name, Location loc)
+ protected override UsageVector Merge ()
{
- if (name != stmt.Name)
- return Parent.LookupLabel (name, loc);
+ UsageVector vector = base.Merge ();
+
+ if (actual.Reachability.IsUnreachable)
+ Report.Warning (162, 2, stmt.loc, "Unreachable code detected");
- stmt.AddReference ();
- return stmt;
+ actual.MergeChild (vector, false);
+ return actual;
}
}
public class FlowBranchingToplevel : FlowBranchingBlock
{
+ UsageVector return_origins;
+
public FlowBranchingToplevel (FlowBranching parent, ToplevelBlock stmt)
: base (parent, BranchingType.Toplevel, SiblingType.Conditional, stmt, stmt.loc)
{
// </summary>
void CheckOutParameters (UsageVector vector, Location loc)
{
+ if (vector.Reachability.IsUnreachable)
+ return;
for (int i = 0; i < param_map.Count; i++) {
VariableInfo var = param_map [i];
public override bool AddReturnOrigin (UsageVector vector, Location loc)
{
- CheckOutParameters (vector, loc);
+ vector = vector.Clone ();
+ vector.Location = loc;
+ vector.Next = return_origins;
+ return_origins = vector;
return false;
}
// nothing to do
}
- public override LabeledStatement LookupLabel (string name, Location loc)
+ public override bool AddGotoOrigin (UsageVector vector, Goto goto_stmt)
{
+ string name = goto_stmt.Target;
LabeledStatement s = Block.LookupLabel (name);
if (s != null)
throw new InternalErrorException ("Shouldn't get here");
- if (Parent != null) {
- s = Parent.LookupLabel (name, loc);
- if (s != null) {
- Report.Error (1632, loc, "Control cannot leave the body of an anonymous method");
- return null;
- }
+ if (Parent == null) {
+ Report.Error (159, goto_stmt.loc, "No such label `{0}' in this scope", name);
+ return false;
}
- Report.Error (159, loc, "No such label `{0}' in this scope", name);
- return null;
+ int errors = Report.Errors;
+ Parent.AddGotoOrigin (vector, goto_stmt);
+ if (errors == Report.Errors)
+ Report.Error (1632, goto_stmt.loc, "Control cannot leave the body of an anonymous method");
+ return false;
}
- public Reachability End ()
+ protected override UsageVector Merge ()
{
- UsageVector result = Merge ();
+ for (UsageVector origin = return_origins; origin != null; origin = origin.Next)
+ CheckOutParameters (origin, origin.Location);
- Report.Debug (4, "MERGE TOP BLOCK", Location, result);
-
- if (!result.Reachability.AlwaysThrows && !result.Reachability.AlwaysHasBarrier)
- CheckOutParameters (result, Location);
+ UsageVector vector = base.Merge ();
+ CheckOutParameters (vector, Block.loc);
+ // Note: we _do_not_ merge in the return origins
+ return vector;
+ }
- return result.Reachability;
+ public Reachability End ()
+ {
+ return Merge ().Reachability;
}
}
UsageVector break_origins;
UsageVector continue_origins;
UsageVector return_origins;
+ GotoOrigin goto_origins;
+
+ class GotoOrigin {
+ public GotoOrigin Next;
+ public Goto GotoStmt;
+ public UsageVector Vector;
+
+ public GotoOrigin (UsageVector vector, Goto goto_stmt, GotoOrigin next)
+ {
+ Vector = vector;
+ GotoStmt = goto_stmt;
+ Next = next;
+ }
+ }
bool emit_finally;
public override bool AddBreakOrigin (UsageVector vector, Location loc)
{
+ vector = vector.Clone ();
if (finally_vector != null) {
- Report.Error (157, loc, "Control cannot leave the body of a finally clause");
+ vector.MergeChild (finally_vector, false);
+ int errors = Report.Errors;
+ Parent.AddBreakOrigin (vector, loc);
+ if (errors == Report.Errors)
+ Report.Error (157, loc, "Control cannot leave the body of a finally clause");
} else {
- vector = vector.Clone ();
vector.Location = loc;
vector.Next = break_origins;
break_origins = vector;
public override bool AddContinueOrigin (UsageVector vector, Location loc)
{
+ vector = vector.Clone ();
if (finally_vector != null) {
- Report.Error (157, loc, "Control cannot leave the body of a finally clause");
+ vector.MergeChild (finally_vector, false);
+ int errors = Report.Errors;
+ Parent.AddContinueOrigin (vector, loc);
+ if (errors == Report.Errors)
+ Report.Error (157, loc, "Control cannot leave the body of a finally clause");
} else {
- vector = vector.Clone ();
vector.Location = loc;
vector.Next = continue_origins;
continue_origins = vector;
public override bool AddReturnOrigin (UsageVector vector, Location loc)
{
+ vector = vector.Clone ();
if (finally_vector != null) {
- Report.Error (157, loc, "Control cannot leave the body of a finally clause");
+ vector.MergeChild (finally_vector, false);
+ int errors = Report.Errors;
+ Parent.AddReturnOrigin (vector, loc);
+ if (errors == Report.Errors)
+ Report.Error (157, loc, "Control cannot leave the body of a finally clause");
} else {
- vector = vector.Clone ();
vector.Location = loc;
vector.Next = return_origins;
return_origins = vector;
return true;
}
+ public override bool AddGotoOrigin (UsageVector vector, Goto goto_stmt)
+ {
+ LabeledStatement s = current_vector.Block == null ? null : current_vector.Block.LookupLabel (goto_stmt.Target);
+ if (s != null)
+ throw new InternalErrorException ("Shouldn't get here");
+
+ vector = vector.Clone ();
+ if (finally_vector != null) {
+ vector.MergeChild (finally_vector, false);
+ int errors = Report.Errors;
+ Parent.AddGotoOrigin (vector, goto_stmt);
+ if (errors == Report.Errors)
+ Report.Error (157, goto_stmt.loc, "Control cannot leave the body of a finally clause");
+ } else {
+ goto_origins = new GotoOrigin (vector, goto_stmt, goto_origins);
+ }
+ return true;
+ }
+
public override void StealFinallyClauses (ref ArrayList list)
{
if (list == null)
get { return emit_finally; }
}
- public override LabeledStatement LookupLabel (string name, Location loc)
- {
- if (current_vector.Block == null)
- return base.LookupLabel (name, loc);
-
- LabeledStatement s = current_vector.Block.LookupLabel (name);
- if (s != null)
- return s;
-
- if (finally_vector != null) {
- Report.Error (157, loc, "Control cannot leave the body of a finally clause");
- return null;
- }
-
- return base.LookupLabel (name, loc);
- }
-
- public override void Label (UsageVector origin_vectors)
- {
- CurrentUsageVector.MergeOrigins (origin_vectors);
- }
-
protected override UsageVector Merge ()
{
Report.Debug (2, " MERGING TRY/CATCH", Name);
for (UsageVector origin = break_origins; origin != null; origin = origin.Next) {
if (finally_vector != null)
origin.MergeChild (finally_vector, false);
- if (!origin.Reachability.IsUnreachable)
- Parent.AddBreakOrigin (origin, origin.Location);
+ Parent.AddBreakOrigin (origin, origin.Location);
}
for (UsageVector origin = continue_origins; origin != null; origin = origin.Next) {
if (finally_vector != null)
origin.MergeChild (finally_vector, false);
- if (!origin.Reachability.IsUnreachable)
- Parent.AddContinueOrigin (origin, origin.Location);
+ Parent.AddContinueOrigin (origin, origin.Location);
}
for (UsageVector origin = return_origins; origin != null; origin = origin.Next) {
if (finally_vector != null)
origin.MergeChild (finally_vector, false);
- if (!origin.Reachability.IsUnreachable)
- Parent.AddReturnOrigin (origin, origin.Location);
+ Parent.AddReturnOrigin (origin, origin.Location);
+ }
+
+ for (GotoOrigin origin = goto_origins; origin != null; origin = origin.Next) {
+ if (finally_vector != null)
+ origin.Vector.MergeChild (finally_vector, false);
+ Parent.AddGotoOrigin (origin.Vector, origin.GotoStmt);
}
return vector;
ArrayList non_public_fields = new ArrayList ();
if (fields != null) {
- foreach (FieldMember field in fields) {
+ foreach (FieldBase field in fields) {
if ((field.ModFlags & Modifiers.STATIC) != 0)
continue;
if ((field.ModFlags & Modifiers.PUBLIC) != 0)
Fields = new FieldInfo [Count];
public_fields.CopyTo (Fields, 0);
non_public_fields.CopyTo (Fields, CountPublic);
+#if GMCS_SOURCE
+ } else if (type is GenericTypeParameterBuilder) {
+ CountPublic = CountNonPublic = Count = 0;
+
+ Fields = new FieldInfo [0];
+#endif
} else {
FieldInfo[] public_fields = type.GetFields (
BindingFlags.Instance|BindingFlags.Public);
// </summary>
public class MyBitVector {
public readonly int Count;
- public MyBitVector InheritsFrom;
public static readonly MyBitVector Empty = new MyBitVector ();
- BitArray vector;
+ // Invariant: vector != null => vector.Count == Count
+ // Invariant: vector == null || shared == null
+ // i.e., at most one of 'vector' and 'shared' can be non-null. They can both be null -- that means all-ones
+ // The object in 'shared' cannot be modified, while 'vector' can be freely modified
+ BitArray vector, shared;
MyBitVector ()
{
- InheritsFrom = null;
- Count = 0;
+ shared = new BitArray (0, false);
}
public MyBitVector (MyBitVector InheritsFrom, int Count)
{
- if (InheritsFrom != null) {
- while (InheritsFrom.InheritsFrom != null)
- InheritsFrom = InheritsFrom.InheritsFrom;
- if (InheritsFrom.Count >= Count && InheritsFrom.vector == null)
- InheritsFrom = null;
- }
+ if (InheritsFrom != null)
+ shared = InheritsFrom.Shared;
- this.InheritsFrom = InheritsFrom;
this.Count = Count;
}
+ // Use this accessor to get a shareable copy of the underlying BitArray representation
+ BitArray Shared {
+ get {
+ // Post-condition: vector == null
+ if (shared == null) {
+ shared = vector;
+ vector = null;
+ }
+ return shared;
+ }
+ }
+
// <summary>
// Get/set bit `index' in the bit vector.
// </summary>
- public bool this [int index]
- {
+ public bool this [int index] {
get {
if (index >= Count)
throw new ArgumentOutOfRangeException ();
- // We're doing a "copy-on-write" strategy here; as long
- // as nobody writes to the array, we can use our parent's
- // copy instead of duplicating the vector.
-
if (vector != null)
return vector [index];
- if (InheritsFrom == null)
+ if (shared == null)
return true;
- if (index < InheritsFrom.Count)
- return InheritsFrom [index];
+ if (index < shared.Count)
+ return shared [index];
return false;
}
// Performs an `or' operation on the bit vector. The `new_vector' may have a
// different size than the current one.
// </summary>
- private void Or (MyBitVector new_vector)
+ private MyBitVector Or (MyBitVector new_vector)
{
- int min = new_vector.Count;
+ if (Count == 0 || new_vector.Count == 0)
+ return this;
+
+ BitArray o = new_vector.vector != null ? new_vector.vector : new_vector.shared;
+
+ if (o == null) {
+ int n = new_vector.Count;
+ if (n < Count) {
+ for (int i = 0; i < n; ++i)
+ this [i] = true;
+ } else {
+ SetAll (true);
+ }
+ return this;
+ }
+
+ if (Count == o.Count) {
+ if (vector == null) {
+ if (shared == null)
+ return this;
+ initialize_vector ();
+ }
+ vector.Or (o);
+ return this;
+ }
+
+ int min = o.Count;
if (Count < min)
min = Count;
- for (int i = 0; i < min; i++)
- this [i] |= new_vector [i];
+ for (int i = 0; i < min; i++) {
+ if (o [i])
+ this [i] = true;
+ }
+
+ return this;
}
// <summary>
- // Perfonrms an `and' operation on the bit vector. The `new_vector' may have
+ // Performs an `and' operation on the bit vector. The `new_vector' may have
// a different size than the current one.
// </summary>
- private void And (MyBitVector new_vector)
+ private MyBitVector And (MyBitVector new_vector)
{
- int min = new_vector.Count;
+ if (Count == 0)
+ return this;
+
+ BitArray o = new_vector.vector != null ? new_vector.vector : new_vector.shared;
+
+ if (o == null) {
+ for (int i = new_vector.Count; i < Count; ++i)
+ this [i] = false;
+ return this;
+ }
+
+ if (o.Count == 0) {
+ SetAll (false);
+ return this;
+ }
+
+ if (Count == o.Count) {
+ if (vector == null) {
+ if (shared == null) {
+ shared = new_vector.Shared;
+ return this;
+ }
+ initialize_vector ();
+ }
+ vector.And (o);
+ return this;
+ }
+
+ int min = o.Count;
if (Count < min)
min = Count;
- for (int i = 0; i < min; i++)
- this [i] &= new_vector [i];
+ for (int i = 0; i < min; i++) {
+ if (! o [i])
+ this [i] = false;
+ }
for (int i = min; i < Count; i++)
this [i] = false;
+
+ return this;
}
- public static void And (ref MyBitVector target, MyBitVector vector)
+ public static MyBitVector operator & (MyBitVector a, MyBitVector b)
{
- if (vector == null)
- return;
- if (target == null)
- target = vector.Clone ();
+ if (a == b)
+ return a;
+ if (a == null)
+ return b.Clone ();
+ if (b == null)
+ return a.Clone ();
+ if (a.Count > b.Count)
+ return a.Clone ().And (b);
else
- target.And (vector);
+ return b.Clone ().And (a);
}
- public static void Or (ref MyBitVector target, MyBitVector vector)
+ public static MyBitVector operator | (MyBitVector a, MyBitVector b)
{
- if (target == null)
- return;
- if (vector == null)
- target.SetAll (true);
+ if (a == b)
+ return a;
+ if (a == null)
+ return new MyBitVector (null, b.Count);
+ if (b == null)
+ return new MyBitVector (null, a.Count);
+ if (a.Count > b.Count)
+ return a.Clone ().Or (b);
else
- target.Or (vector);
+ return b.Clone ().Or (a);
}
- // <summary>
- // This does a deep copy of the bit vector.
- // </summary>
public MyBitVector Clone ()
{
- if (Count == 0)
- return Empty;
- MyBitVector retval = new MyBitVector (this, Count);
- retval.initialize_vector ();
- return retval;
+ return Count == 0 ? Empty : new MyBitVector (this, Count);
}
public void SetAll (bool value)
{
- InheritsFrom = value ? null : Empty;
+ // Don't clobber Empty
+ if (Count == 0)
+ return;
+ shared = value ? null : Empty.Shared;
vector = null;
}
void initialize_vector ()
{
- if (InheritsFrom == null) {
+ // Post-condition: vector != null
+ if (shared == null) {
vector = new BitArray (Count, true);
return;
}
- vector = new BitArray (Count, false);
-
- int min = InheritsFrom.Count;
- if (min > Count)
- min = Count;
-
- for (int i = 0; i < min; i++)
- vector [i] = InheritsFrom [i];
-
- InheritsFrom = null;
+ vector = new BitArray (shared);
+ if (Count != vector.Count)
+ vector.Length = Count;
+ shared = null;
}
StringBuilder Dump (StringBuilder sb)
{
- if (vector == null)
- return InheritsFrom == null ? sb.Append ("/") : InheritsFrom.Dump (sb.Append ("="));
- for (int i = 0; i < Count; i++)
- sb.Append (this [i] ? "1" : "0");
+ BitArray dump = vector == null ? shared : vector;
+ if (dump == null)
+ return sb.Append ("/");
+ if (dump == shared)
+ sb.Append ("=");
+ for (int i = 0; i < dump.Count; i++)
+ sb.Append (dump [i] ? "1" : "0");
return sb;
}
projects / mono.git / blobdiff