public AwaitCatchFrame(TypeSystemServices tss, BooCodeBuilder builder, Method currentMethod)
{
pendingCaughtException = builder.DeclareTempLocal(currentMethod, tss.ObjectType);
pendingCatch = builder.DeclareTempLocal(currentMethod, tss.IntType);
handlers = new List <Block>();
_hoistedLocals = new Dictionary <InternalLocal, InternalLocal>();
_orderedHoistedLocals = new List <InternalLocal>();
_currentMethod = currentMethod;
}
public static void UnpackArray(BooCodeBuilder codeBuilder, Method method, Block block, Expression expression, DeclarationCollection declarations)
{
ILocalEntity local = expression.Entity as ILocalEntity;
if (null == local)
{
local = codeBuilder.DeclareTempLocal(method,
expression.ExpressionType);
block.Add(
codeBuilder.CreateAssignment(
codeBuilder.CreateReference(local),
expression));
}
for (int i = 0; i < declarations.Count; ++i)
{
Declaration declaration = declarations[i];
block.Add(
codeBuilder.CreateAssignment(
codeBuilder.CreateReference(
declaration.Entity),
codeBuilder.CreateSlicing(
codeBuilder.CreateReference(local),
i)));
}
}
public InternalLabel ProxyReturnIfNeeded(
Method containingMethod,
Node valueOpt,
out InternalLocal retVal)
{
retVal = null;
// no need to proxy returns at the root
if (IsRoot())
{
return(null);
}
var returnProxy = returnProxyLabel;
if (returnProxy == null)
{
returnProxyLabel = returnProxy = _builder.CreateLabel(valueOpt ?? containingMethod, "returnProxy", _tryDepth);
}
if (valueOpt != null)
{
retVal = returnValue;
if (retVal == null)
{
Debug.Assert(_tryStatementOpt != null);
returnValue = retVal = _builder.DeclareTempLocal(
containingMethod,
((ITypedEntity)valueOpt.Entity).Type);
}
}
return(returnProxy);
}
private Expression VisitExpression(ref BoundSpillSequenceBuilder builder, Expression expression)
{
// wrap the node in a spill sequence to mark the fact that it must be moved up the tree.
// The caller will handle this node type if the result is discarded.
if (expression != null && expression.NodeType == NodeType.AwaitExpression)
{
// we force the await expression to be assigned to a temp variable
var awaitExpression = (AwaitExpression)expression;
awaitExpression.BaseExpression = VisitExpression(ref builder, awaitExpression.BaseExpression);
var local = _F.DeclareTempLocal(_currentMethod, awaitExpression.ExpressionType);
var replacement = _F.CreateAssignment(
awaitExpression.LexicalInfo,
_F.CreateLocalReference(local),
awaitExpression);
if (builder == null)
{
builder = new BoundSpillSequenceBuilder();
}
builder.AddLocal(local);
builder.AddStatement(new ExpressionStatement(replacement));
return(_F.CreateLocalReference(local));
}
var e = Visit(expression);
if (e == null || e.NodeType != SpillSequenceBuilder)
{
return(e);
}
var newBuilder = (BoundSpillSequenceBuilder)e;
if (builder == null)
{
builder = newBuilder.Update(null);
}
else
{
builder.Include(newBuilder);
}
return(newBuilder.Value);
}
public static void UnpackEnumerable(BooCodeBuilder codeBuilder, Method method, Block block, Expression expression, DeclarationCollection declarations)
{
TypeSystemServices tss = codeBuilder.TypeSystemServices;
InternalLocal local = codeBuilder.DeclareTempLocal(method,
tss.IEnumeratorType);
IType expressionType = expression.ExpressionType;
if (expressionType.IsSubclassOf(codeBuilder.TypeSystemServices.IEnumeratorType))
{
block.Add(
codeBuilder.CreateAssignment(
codeBuilder.CreateReference(local),
expression));
}
else
{
if (!expressionType.IsSubclassOf(codeBuilder.TypeSystemServices.IEnumerableType))
{
expression = codeBuilder.CreateMethodInvocation(
RuntimeServices_GetEnumerable, expression);
}
block.Add(
codeBuilder.CreateAssignment(
block.LexicalInfo,
codeBuilder.CreateReference(local),
codeBuilder.CreateMethodInvocation(
expression, IEnumerable_GetEnumerator)));
}
for (int i = 0; i < declarations.Count; ++i)
{
Declaration declaration = declarations[i];
block.Add(
codeBuilder.CreateAssignment(
codeBuilder.CreateReference(declaration.Entity),
codeBuilder.CreateMethodInvocation(RuntimeServices_MoveNext,
codeBuilder.CreateReference(local))));
}
}
public void HoistLocal(InternalLocal local, BooCodeBuilder F)
{
if (!_hoistedLocals.Keys.Any(l => l.Name == local.Name && l.Type == local.Type))
{
_hoistedLocals.Add(local, local);
_orderedHoistedLocals.Add(local);
return;
}
// code uses "await" in two sibling catches with exception filters
// locals with same names and types may cause problems if they are lifted
// and become fields with identical signatures.
// To avoid such problems we will mangle the name of the second local.
// This will only affect debugging of this extremely rare case.
var newLocal = F.DeclareTempLocal(_currentMethod, local.Type);
_hoistedLocals.Add(local, newLocal);
_orderedHoistedLocals.Add(newLocal);
}