public sealed class Reachability
{
- FlowReturns returns, breaks, throws, barrier, reachable;
+ FlowReturns returns, breaks, throws, barrier;
public FlowReturns Returns {
get { return returns; }
public FlowReturns Barrier {
get { return barrier; }
}
- public FlowReturns Reachable {
- get { return reachable; }
- }
-
public Reachability (FlowReturns returns, FlowReturns breaks,
FlowReturns throws, FlowReturns barrier)
{
this.breaks = breaks;
this.throws = throws;
this.barrier = barrier;
-
- update ();
}
public Reachability Clone ()
{
- Reachability cloned = new Reachability (returns, breaks, throws, barrier);
- cloned.reachable = reachable;
- return cloned;
+ return new Reachability (returns, breaks, throws, barrier);
}
// <summary>
a.throws = AndFlowReturns (a.throws, b.throws);
a.barrier = AndFlowReturns (a.barrier, b.barrier);
- a.reachable = AndFlowReturns (a.reachable, b.reachable);
+ if (a_unreachable && b_unreachable)
+ a.barrier = FlowReturns.Always;
+ else if (a_unreachable || b_unreachable)
+ a.barrier = FlowReturns.Sometimes;
+ else
+ a.barrier = FlowReturns.Never;
}
public void Or (Reachability b)
breaks = OrFlowReturns (breaks, b.breaks);
throws = OrFlowReturns (throws, b.throws);
barrier = OrFlowReturns (barrier, b.barrier);
-
- update ();
}
public static Reachability Never ()
FlowReturns.Never, FlowReturns.Never);
}
- void update ()
- {
- if ((returns == FlowReturns.Always) || (breaks == FlowReturns.Always) ||
- (throws == FlowReturns.Always) || (barrier == FlowReturns.Always))
- reachable = FlowReturns.Never;
- else if ((returns == FlowReturns.Never) && (breaks == FlowReturns.Never) &&
- (throws == FlowReturns.Never) && (barrier == FlowReturns.Never))
- reachable = FlowReturns.Always;
- else
- reachable = FlowReturns.Sometimes;
+ public FlowReturns Reachable {
+ get {
+ if ((returns == FlowReturns.Always) ||
+ (breaks == FlowReturns.Always) ||
+ (throws == FlowReturns.Always) ||
+ (barrier == FlowReturns.Always))
+ return FlowReturns.Never;
+ else if ((returns == FlowReturns.Never) &&
+ (breaks == FlowReturns.Never) &&
+ (throws == FlowReturns.Never) &&
+ (barrier == FlowReturns.Never))
+ return FlowReturns.Always;
+ else
+ return FlowReturns.Sometimes;
+ }
}
public bool AlwaysBreaks {
}
public bool IsUnreachable {
- get { return reachable == FlowReturns.Never; }
+ get { return Reachable == FlowReturns.Never; }
}
public void SetReturns ()
{
returns = FlowReturns.Always;
- update ();
}
public void SetReturnsSometimes ()
{
returns = FlowReturns.Sometimes;
- update ();
}
public void SetBreaks ()
{
breaks = FlowReturns.Always;
- update ();
}
public void ResetBreaks ()
{
breaks = FlowReturns.Never;
- update ();
}
public void SetThrows ()
{
throws = FlowReturns.Always;
- update ();
+ }
+
+ public void SetThrowsSometimes ()
+ {
+ throws = FlowReturns.Sometimes;
}
public void SetBarrier ()
{
barrier = FlowReturns.Always;
- update ();
+ }
+
+ public void ResetBarrier ()
+ {
+ barrier = FlowReturns.Never;
}
static string ShortName (FlowReturns returns)
return String.Format ("[{0}:{1}:{2}:{3}:{4}]",
ShortName (returns), ShortName (breaks),
ShortName (throws), ShortName (barrier),
- ShortName (reachable));
+ ShortName (Reachable));
}
}
{
switch (type) {
case BranchingType.Exception:
- return new FlowBranchingException (parent, block, loc);
+ throw new InvalidOperationException ();
case BranchingType.Switch:
return new FlowBranchingBlock (parent, type, SiblingType.SwitchSection, block, loc);
case BranchingType.Block:
return new FlowBranchingBlock (parent, type, SiblingType.Block, block, loc);
+ case BranchingType.Loop:
+ return new FlowBranchingLoop (parent, block, loc);
+
default:
return new FlowBranchingBlock (parent, type, SiblingType.Conditional, block, loc);
}
// </summary>
public readonly Location Location;
+ // <summary>
+ // This is only valid for SwitchSection, Try, Catch and Finally.
+ // </summary>
+ public readonly Block Block;
+
// <summary>
// If this is true, then the usage vector has been modified and must be
// merged when we're done with this branching.
//
// Normally, you should not use any of these constructors.
//
- public UsageVector (SiblingType type, UsageVector parent, Location loc, int num_params, int num_locals)
+ public UsageVector (SiblingType type, UsageVector parent,
+ Block block, Location loc,
+ int num_params, int num_locals)
{
this.Type = type;
+ this.Block = block;
this.Location = loc;
this.InheritsFrom = parent;
this.CountParameters = num_params;
id = ++next_id;
}
- public UsageVector (SiblingType type, UsageVector parent, Location loc)
- : this (type, parent, loc, parent.CountParameters, parent.CountLocals)
+ public UsageVector (SiblingType type, UsageVector parent,
+ Block block, Location loc)
+ : this (type, parent, block, loc,
+ parent.CountParameters, parent.CountLocals)
{ }
public UsageVector (MyBitVector parameters, MyBitVector locals,
- Reachability reachability, Location loc)
+ Reachability reachability, Block block,
+ Location loc)
{
this.Type = SiblingType.Block;
this.Location = loc;
+ this.Block = block;
this.reachability = reachability;
this.parameters = parameters;
// </summary>
public UsageVector Clone ()
{
- UsageVector retval = new UsageVector (Type, null, Location, CountParameters, CountLocals);
+ UsageVector retval = new UsageVector (
+ Type, null, Block, Location,
+ CountParameters, CountLocals);
if (retval.locals != null)
retval.locals = locals.Clone ();
public bool IsAssigned (VariableInfo var)
{
- if (!var.IsParameter && Reachability.AlwaysBreaks)
+ if (!var.IsParameter && Reachability.IsUnreachable)
return true;
return var.IsAssigned (var.IsParameter ? parameters : locals);
public void SetAssigned (VariableInfo var)
{
- if (!var.IsParameter && Reachability.AlwaysBreaks)
+ if (!var.IsParameter && Reachability.IsUnreachable)
return;
IsDirty = true;
public bool IsFieldAssigned (VariableInfo var, string name)
{
- if (!var.IsParameter && Reachability.AlwaysBreaks)
+ if (!var.IsParameter && Reachability.IsUnreachable)
return true;
return var.IsFieldAssigned (var.IsParameter ? parameters : locals, name);
public void SetFieldAssigned (VariableInfo var, string name)
{
- if (!var.IsParameter && Reachability.AlwaysBreaks)
+ if (!var.IsParameter && Reachability.IsUnreachable)
return;
IsDirty = true;
{
UsageVector result = branching.Merge ();
- Report.Debug (2, " MERGING CHILD", this, IsDirty,
+ Report.Debug (2, " MERGING CHILD", this, branching, IsDirty,
result.ParameterVector, result.LocalVector,
result.Reachability, reachability, Type);
// We're either finite or we may leave the loop.
new_r.SetReturnsSometimes ();
}
+ if (new_r.Throws == FlowReturns.Always) {
+ // We're either finite or we may leave the loop.
+ new_r.SetThrowsSometimes ();
+ }
+
+ if (!new_r.MayReturn && !new_r.MayThrow)
+ new_r.ResetBarrier ();
}
- } else if (branching.Type == BranchingType.Switch)
+ } else if (branching.Type == BranchingType.Switch) {
+ if (new_r.MayBreak || new_r.MayReturn)
+ new_r.ResetBarrier ();
+
new_r.ResetBreaks ();
+ }
//
// We've now either reached the point after the branching or we will
if (result.ParameterVector != null)
parameters.Or (result.ParameterVector);
- reachability.Or (new_r);
+ if ((branching.Type == BranchingType.Block) && branching.Block.Implicit)
+ reachability = new_r.Clone ();
+ else
+ reachability.Or (new_r);
Report.Debug (2, " MERGING CHILD DONE", this, result,
new_r, reachability);
// 8 Console.WriteLine (a);
//
// </summary>
- public void MergeJumpOrigins (ICollection origin_vectors)
+ public void MergeJumpOrigins (UsageVector o_vectors)
{
Report.Debug (1, " MERGING JUMP ORIGINS", this);
reachability = Reachability.Never ();
- if (origin_vectors == null)
+ if (o_vectors == null) {
+ reachability.SetBarrier ();
return;
+ }
bool first = true;
- foreach (UsageVector vector in origin_vectors) {
- Report.Debug (1, " MERGING JUMP ORIGIN", vector);
+ for (UsageVector vector = o_vectors; vector != null;
+ vector = vector.Next) {
+ Report.Debug (1, " MERGING JUMP ORIGIN", vector,
+ first, locals, vector.Locals);
if (first) {
if (locals != null && vector.Locals != null)
parameters.Or (vector.parameters);
first = false;
} else {
- if (locals != null && vector.Locals != null)
+ if (locals != null)
locals.And (vector.locals);
if (parameters != null)
parameters.And (vector.parameters);
}
Reachability.And (ref reachability, vector.Reachability, true);
+
+ Report.Debug (1, " MERGING JUMP ORIGIN #1", vector);
}
Report.Debug (1, " MERGING JUMP ORIGINS DONE", this);
Report.Debug (1, " MERGING FINALLY ORIGIN DONE", this);
}
+ public void MergeBreakOrigins (FlowBranching branching, UsageVector o_vectors)
+ {
+ Report.Debug (1, " MERGING BREAK ORIGINS", this);
+
+ if (o_vectors == null)
+ return;
+
+ bool first = branching.Infinite;
+
+ for (UsageVector vector = o_vectors; vector != null;
+ vector = vector.Next) {
+ Report.Debug (1, " MERGING BREAK ORIGIN", vector);
+
+ if (first) {
+ if (locals != null && vector.Locals != null)
+ locals.Or (vector.locals);
+
+ if (parameters != null)
+ parameters.Or (vector.parameters);
+ first = false;
+ } else {
+ if (locals != null && vector.Locals != null)
+ locals.And (vector.locals);
+ if (parameters != null)
+ parameters.And (vector.parameters);
+ }
+ }
+
+ Report.Debug (1, " MERGING BREAK ORIGINS DONE", this);
+ }
+
public void CheckOutParameters (FlowBranching branching)
{
if (parameters != null)
StringBuilder sb = new StringBuilder ();
sb.Append ("Vector (");
+ sb.Append (Type);
+ sb.Append (",");
sb.Append (id);
sb.Append (",");
sb.Append (IsDirty);
local_map = Block.LocalMap;
UsageVector parent_vector = parent != null ? parent.CurrentUsageVector : null;
- vector = new UsageVector (stype, parent_vector, loc, param_map.Length, local_map.Length);
-
-
+ vector = new UsageVector (
+ stype, parent_vector, Block, loc,
+ param_map.Length, local_map.Length);
} else {
param_map = Parent.param_map;
local_map = Parent.local_map;
- vector = new UsageVector (stype, Parent.CurrentUsageVector, loc);
+ vector = new UsageVector (
+ stype, Parent.CurrentUsageVector, null, loc);
}
AddSibling (vector);
// <summary>
// Creates a sibling of the current usage vector.
// </summary>
- public virtual void CreateSibling (SiblingType type)
+ public virtual void CreateSibling (Block block, SiblingType type)
{
- AddSibling (new UsageVector (type, Parent.CurrentUsageVector, Location));
+ UsageVector vector = new UsageVector (
+ type, Parent.CurrentUsageVector, block, Location);
+ AddSibling (vector);
Report.Debug (1, " CREATED SIBLING", CurrentUsageVector);
}
+ public void CreateSibling ()
+ {
+ CreateSibling (null, SiblingType.Conditional);
+ }
+
protected abstract void AddSibling (UsageVector uv);
- public abstract void Label (ArrayList origin_vectors);
+ public virtual LabeledStatement LookupLabel (string name, Location loc)
+ {
+ if (Parent != null)
+ return Parent.LookupLabel (name, loc);
+
+ Report.Error (
+ 159, loc,
+ "No such label `" + name + "' in this scope");
+ return null;
+ }
+
+ public abstract void Label (UsageVector origin_vectors);
// <summary>
// Check whether all `out' parameters have been assigned.
Report.Error (177, loc, "The out parameter `" +
var.Name + "' must be " +
- "assigned before control leave the current method.");
+ "assigned before control leaves the current method.");
}
}
//
bool do_break_2 = (child.Type != SiblingType.Block) &&
(child.Type != SiblingType.SwitchSection);
- bool unreachable = (do_break_2 && child.Reachability.AlwaysBreaks) ||
- child.Reachability.AlwaysThrows ||
+ bool always_throws = (child.Type != SiblingType.Try) &&
+ child.Reachability.AlwaysThrows;
+ bool unreachable = always_throws ||
+ (do_break_2 && child.Reachability.AlwaysBreaks) ||
child.Reachability.AlwaysReturns ||
child.Reachability.AlwaysHasBarrier;
Report.Debug (2, " MERGING SIBLING #1", reachability,
Type, child.Type, child.Reachability.IsUnreachable,
- do_break_2, unreachable);
+ do_break_2, always_throws, unreachable);
if (!unreachable && (child.LocalVector != null))
MyBitVector.And (ref locals, child.LocalVector);
Report.Debug (2, " MERGING SIBLINGS DONE", parameters, locals,
reachability, Infinite);
- return new UsageVector (parameters, locals, reachability, Location);
+ return new UsageVector (
+ parameters, locals, reachability, null, Location);
}
protected abstract UsageVector Merge ();
throw new NotSupportedException ();
UsageVector vector = new UsageVector (
- SiblingType.Conditional, null, Location, param_map.Length, local_map.Length);
+ SiblingType.Block, null, Block, Location,
+ param_map.Length, local_map.Length);
UsageVector result = vector.MergeChild (this);
Report.Debug (4, "MERGE TOP BLOCK", Location, vector, result.Reachability);
- if (vector.Reachability.Throws != FlowReturns.Always)
+ if ((vector.Reachability.Throws != FlowReturns.Always) &&
+ (vector.Reachability.Barrier != FlowReturns.Always))
CheckOutParameters (vector.Parameters, Location);
return result.Reachability;
return false;
}
- //
- // Checks whether we're in a `catch' block.
- //
- public virtual bool InCatch ()
+ public virtual bool InTryWithCatch ()
{
if (Parent != null)
- return Parent.InCatch ();
- else
- return false;
- }
-
- //
- // Checks whether we're in a `finally' block.
- //
- public virtual bool InFinally (bool is_return)
- {
- if (!is_return &&
- ((Type == BranchingType.Loop) || (Type == BranchingType.Switch)))
- return false;
- else if (Parent != null)
- return Parent.InFinally (is_return);
- else
- return false;
+ return Parent.InTryWithCatch ();
+ return false;
}
public virtual bool InLoop ()
throw new NotSupportedException ();
}
+ public virtual void AddBreakVector (UsageVector vector)
+ {
+ if (Parent != null)
+ Parent.AddBreakVector (vector);
+ else if ((Block == null) || !Block.IsDestructor)
+ throw new NotSupportedException ();
+ }
+
+ public virtual void StealFinallyClauses (ref ArrayList list)
+ {
+ if (Parent != null)
+ Parent.StealFinallyClauses (ref list);
+ }
+
public bool IsAssigned (VariableInfo vi)
{
return CurrentUsageVector.IsAssigned (vi);
sibling_list = sibling;
}
- public override void Label (ArrayList origin_vectors)
+ public override LabeledStatement LookupLabel (string name, Location loc)
+ {
+ if (Block == null)
+ return base.LookupLabel (name, loc);
+
+ LabeledStatement s = Block.LookupLabel (name);
+ if (s != null)
+ return s;
+
+ return base.LookupLabel (name, loc);
+ }
+
+ public override void Label (UsageVector origin_vectors)
{
if (!CurrentUsageVector.Reachability.IsUnreachable) {
- if (origin_vectors == null)
- origin_vectors = new ArrayList (1);
- origin_vectors.Add (CurrentUsageVector.Clone ());
+ UsageVector vector = CurrentUsageVector.Clone ();
+ vector.Next = origin_vectors;
+ origin_vectors = vector;
}
CurrentUsageVector.MergeJumpOrigins (origin_vectors);
}
}
+ public class FlowBranchingLoop : FlowBranchingBlock
+ {
+ UsageVector break_origins;
+
+ public FlowBranchingLoop (FlowBranching parent, Block block, Location loc)
+ : base (parent, BranchingType.Loop, SiblingType.Conditional, block, loc)
+ { }
+
+ public override void AddBreakVector (UsageVector vector)
+ {
+ vector = vector.Clone ();
+ vector.Next = break_origins;
+ break_origins = vector;
+ }
+
+ protected override UsageVector Merge ()
+ {
+ UsageVector vector = base.Merge ();
+
+ vector.MergeBreakOrigins (this, break_origins);
+
+ return vector;
+ }
+ }
+
public class FlowBranchingException : FlowBranching
{
+ ExceptionStatement stmt;
UsageVector current_vector;
UsageVector catch_vectors;
UsageVector finally_vector;
UsageVector finally_origins;
- bool in_try;
+ bool emit_finally;
- public FlowBranchingException (FlowBranching parent, Block block, Location loc)
- : base (parent, BranchingType.Exception, SiblingType.Try, block, loc)
- { }
+ public FlowBranchingException (FlowBranching parent,
+ ExceptionStatement stmt)
+ : base (parent, BranchingType.Exception, SiblingType.Try,
+ null, stmt.loc)
+ {
+ this.stmt = stmt;
+ this.emit_finally = true;
+ }
protected override void AddSibling (UsageVector sibling)
{
if (sibling.Type == SiblingType.Try) {
sibling.Next = catch_vectors;
catch_vectors = sibling;
- in_try = true;
} else if (sibling.Type == SiblingType.Catch) {
sibling.Next = catch_vectors;
catch_vectors = sibling;
- in_try = false;
} else if (sibling.Type == SiblingType.Finally) {
sibling.MergeFinallyOrigins (finally_origins);
finally_vector = sibling;
- in_try = false;
} else
throw new InvalidOperationException ();
return finally_vector == null;
}
- public override bool InCatch ()
+ public override bool InTryWithCatch ()
{
- return !in_try && (finally_vector == null);
- }
+ if (finally_vector == null) {
+ Try t = stmt as Try;
+ if (t != null && t.HasCatch)
+ return true;
+ }
- public override bool InFinally (bool is_return)
- {
- return finally_vector != null;
+ if (Parent != null)
+ return Parent.InTryWithCatch ();
+
+ return false;
}
public override bool BreakCrossesTryCatchBoundary ()
finally_origins = vector;
}
- public override void Label (ArrayList origin_vectors)
+ public override void StealFinallyClauses (ref ArrayList list)
+ {
+ if (list == null)
+ list = new ArrayList ();
+ list.Add (stmt);
+ emit_finally = false;
+ base.StealFinallyClauses (ref list);
+ }
+
+ public bool EmitFinally {
+ 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 can not leave the body " +
+ "of the finally block");
+ return null;
+ }
+
+ return base.LookupLabel (name, loc);
+ }
+
+ public override void Label (UsageVector origin_vectors)
{
CurrentUsageVector.MergeJumpOrigins (origin_vectors);
}
if (type is TypeBuilder) {
TypeContainer tc = TypeManager.LookupTypeContainer (type);
- ArrayList fields = tc.Fields;
+ ArrayList fields = null;
+ if (tc != null)
+ fields = tc.Fields;
ArrayList public_fields = new ArrayList ();
ArrayList non_public_fields = new ArrayList ();
if (fields != null) {
- foreach (Field field in fields) {
+ foreach (FieldMember field in fields) {
if ((field.ModFlags & Modifiers.STATIC) != 0)
continue;
if ((field.ModFlags & Modifiers.PUBLIC) != 0)
// </summary>
public void And (MyBitVector new_vector)
{
- BitArray new_array = new_vector.Vector;
+ BitArray new_array;
+
+ if (new_vector != null)
+ new_array = new_vector.Vector;
+ else
+ new_array = new BitArray (Count, false);
initialize_vector ();
projects / mono.git / blobdiff