public override void InjectYield(EmitContext ec, Expression expr, int resume_pc, bool unwind_protect, Label resume_point)
{
// Store the new value into current
var fe = new FieldExpr(((IteratorStorey)storey).CurrentField, loc);
fe.InstanceExpression = new CompilerGeneratedThis(storey.CurrentType, loc);
fe.EmitAssign(ec, expr, false, false);
base.InjectYield(ec, expr, resume_pc, unwind_protect, resume_point);
EmitLeave(ec, unwind_protect);
ec.MarkLabel(resume_point);
}
public void EmitAwaitOnCompletedDynamic(EmitContext ec, FieldExpr awaiter)
{
var critical = Module.PredefinedTypes.ICriticalNotifyCompletion;
if (!critical.Define())
{
throw new NotImplementedException();
}
var temp_critical = new LocalTemporary(critical.TypeSpec);
var label_critical = ec.DefineLabel();
var label_end = ec.DefineLabel();
//
// Special path for dynamic awaiters
//
// var awaiter = this.$awaiter as ICriticalNotifyCompletion;
// if (awaiter == null) {
// var completion = (INotifyCompletion) this.$awaiter;
// this.$builder.AwaitOnCompleted (ref completion, ref this);
// } else {
// this.$builder.AwaitUnsafeOnCompleted (ref awaiter, ref this);
// }
//
awaiter.Emit(ec);
ec.Emit(OpCodes.Isinst, critical.TypeSpec);
temp_critical.Store(ec);
temp_critical.Emit(ec);
ec.Emit(OpCodes.Brtrue_S, label_critical);
var temp = new LocalTemporary(Module.PredefinedTypes.INotifyCompletion.TypeSpec);
awaiter.Emit(ec);
ec.Emit(OpCodes.Castclass, temp.Type);
temp.Store(ec);
EmitOnCompleted(ec, temp, false);
temp.Release(ec);
ec.Emit(OpCodes.Br_S, label_end);
ec.MarkLabel(label_critical);
EmitOnCompleted(ec, temp_critical, true);
ec.MarkLabel(label_end);
temp_critical.Release(ec);
}
public static Expression AddFiled(string fieldAlias, string tableAlias, string schema, Lexem lexem, ExpressionParser parser)
{
if (fieldAlias == "*")
{
if (schema != null)
{
parser.Collection.Error("Can not use schema in * expression", lexem);
}
AllColumnExpr a = new AllColumnExpr();
a.Prefix = tableAlias;
return(a);
}
FieldExpr res = new FieldExpr();
res.FieldName = fieldAlias;
res.TableAlias = tableAlias;
res.Schema = schema;
res.Lexem = lexem;
return(res);
}
public Expression GetResultExpression(EmitContext ec)
{
var fe_awaiter = new FieldExpr(awaiter, loc);
fe_awaiter.InstanceExpression = new CompilerGeneratedThis(ec.CurrentType, loc);
//
// result = awaiter.GetResult ();
//
if (IsDynamic)
{
var rc = new ResolveContext(ec.MemberContext);
return(new Invocation(new MemberAccess(fe_awaiter, "GetResult"), new Arguments(0)).Resolve(rc));
}
var mg_result = MethodGroupExpr.CreatePredefined(awaiter_definition.GetResult, fe_awaiter.Type, loc);
mg_result.InstanceExpression = fe_awaiter;
return(new GetResultInvocation(mg_result, new Arguments(0)));
}
public void EmitAssign(EmitContext ec, FieldExpr field)
{
stmt.EmitPrologue(ec);
field.InstanceExpression.Emit(ec);
stmt.Emit(ec);
}
//
// Creates field access expression for hoisted variable
//
protected virtual FieldExpr GetFieldExpression (EmitContext ec)
{
if (ec.CurrentAnonymousMethod == null || ec.CurrentAnonymousMethod.Storey == null) {
if (cached_outer_access != null)
return cached_outer_access;
//
// When setting top-level hoisted variable in generic storey
// change storey generic types to method generic types (VAR -> MVAR)
//
if (storey.Instance.Type.IsGenericOrParentIsGeneric) {
var fs = MemberCache.GetMember (storey.Instance.Type, field.Spec);
cached_outer_access = new FieldExpr (fs, field.Location);
} else {
cached_outer_access = new FieldExpr (field, field.Location);
}
cached_outer_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
return cached_outer_access;
}
FieldExpr inner_access;
if (cached_inner_access != null) {
if (!cached_inner_access.TryGetValue (ec.CurrentAnonymousMethod, out inner_access))
inner_access = null;
} else {
inner_access = null;
cached_inner_access = new Dictionary<AnonymousExpression, FieldExpr> (4);
}
if (inner_access == null) {
if (field.Parent.IsGenericOrParentIsGeneric) {
var fs = MemberCache.GetMember (field.Parent.CurrentType, field.Spec);
inner_access = new FieldExpr (fs, field.Location);
} else {
inner_access = new FieldExpr (field, field.Location);
}
inner_access.InstanceExpression = storey.GetStoreyInstanceExpression (ec);
cached_inner_access.Add (ec.CurrentAnonymousMethod, inner_access);
}
return inner_access;
}
protected void EmitCall(EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
{
//
// This method generates all internal infrastructure for a dynamic call. The
// reason why it's quite complicated is the mixture of dynamic and anonymous
// methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
// methods can generate temporary storey as well (AnonStorey). Handling MVAR
// type parameters rewrite is non-trivial in such case as there are various
// combinations possible therefore the mutator is not straightforward. Secondly
// we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
// correct Site field type and its access from EmitContext.
//
int dyn_args_count = arguments == null ? 0 : arguments.Count;
int default_args = isStatement ? 1 : 2;
var module = ec.Module;
bool has_ref_out_argument = false;
var targs = new TypeExpression[dyn_args_count + default_args];
targs[0] = new TypeExpression(module.PredefinedTypes.CallSite.TypeSpec, loc);
TypeExpression[] targs_for_instance = null;
TypeParameterMutator mutator;
var site_container = ec.CreateDynamicSite();
if (context_mvars != null)
{
TypeParameters tparam;
TypeContainer sc = site_container;
do
{
tparam = sc.CurrentTypeParameters;
sc = sc.Parent;
} while (tparam == null);
mutator = new TypeParameterMutator(context_mvars, tparam);
if (!ec.IsAnonymousStoreyMutateRequired)
{
targs_for_instance = new TypeExpression[targs.Length];
targs_for_instance[0] = targs[0];
}
}
else
{
mutator = null;
}
for (int i = 0; i < dyn_args_count; ++i)
{
Argument a = arguments[i];
if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
{
has_ref_out_argument = true;
}
var t = a.Type;
// Convert any internal type like dynamic or null to object
if (t.Kind == MemberKind.InternalCompilerType)
{
t = ec.BuiltinTypes.Object;
}
if (targs_for_instance != null)
{
targs_for_instance[i + 1] = new TypeExpression(t, loc);
}
if (mutator != null)
{
t = t.Mutate(mutator);
}
targs[i + 1] = new TypeExpression(t, loc);
}
TypeExpr del_type = null;
TypeExpr del_type_instance_access = null;
if (!has_ref_out_argument)
{
string d_name = isStatement ? "Action" : "Func";
TypeExpr te = null;
Namespace type_ns = module.GlobalRootNamespace.GetNamespace("System", true);
if (type_ns != null)
{
te = type_ns.LookupType(module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
}
if (te != null)
{
if (!isStatement)
{
var t = type;
if (t.Kind == MemberKind.InternalCompilerType)
{
t = ec.BuiltinTypes.Object;
}
if (targs_for_instance != null)
{
targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression(t, loc);
}
if (mutator != null)
{
t = t.Mutate(mutator);
}
targs[targs.Length - 1] = new TypeExpression(t, loc);
}
del_type = new GenericTypeExpr(te.Type, new TypeArguments(targs), loc);
if (targs_for_instance != null)
{
del_type_instance_access = new GenericTypeExpr(te.Type, new TypeArguments(targs_for_instance), loc);
}
else
{
del_type_instance_access = del_type;
}
}
}
//
// Create custom delegate when no appropriate predefined delegate has been found
//
Delegate d;
if (del_type == null)
{
TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
Parameter[] p = new Parameter[dyn_args_count + 1];
p[0] = new Parameter(targs[0], "p0", Parameter.Modifier.NONE, null, loc);
var site = ec.CreateDynamicSite();
int index = site.Containers == null ? 0 : site.Containers.Count;
if (mutator != null)
{
rt = mutator.Mutate(rt);
}
for (int i = 1; i < dyn_args_count + 1; ++i)
{
p[i] = new Parameter(targs[i], "p" + i.ToString("X"), arguments[i - 1].Modifier, null, loc);
}
d = new Delegate(site, new TypeExpression(rt, loc),
Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
new MemberName("Container" + index.ToString("X")),
new ParametersCompiled(p), null);
d.CreateContainer();
d.DefineContainer();
d.Define();
site.AddTypeContainer(d);
del_type = new TypeExpression(d.CurrentType, loc);
if (targs_for_instance != null)
{
del_type_instance_access = null;
}
else
{
del_type_instance_access = del_type;
}
}
else
{
d = null;
}
var site_type_decl = new GenericTypeExpr(module.PredefinedTypes.CallSiteGeneric.TypeSpec, new TypeArguments(del_type), loc);
var field = site_container.CreateCallSiteField(site_type_decl, loc);
if (field == null)
{
return;
}
if (del_type_instance_access == null)
{
var dt = d.CurrentType.DeclaringType.MakeGenericType(module, context_mvars.Types);
del_type_instance_access = new TypeExpression(MemberCache.GetMember(dt, d.CurrentType), loc);
}
var instanceAccessExprType = new GenericTypeExpr(module.PredefinedTypes.CallSiteGeneric.TypeSpec,
new TypeArguments(del_type_instance_access), loc);
if (instanceAccessExprType.ResolveAsType(ec.MemberContext) == null)
{
return;
}
bool inflate_using_mvar = context_mvars != null && ec.IsAnonymousStoreyMutateRequired;
TypeSpec gt;
if (inflate_using_mvar || context_mvars == null)
{
gt = site_container.CurrentType;
}
else
{
gt = site_container.CurrentType.MakeGenericType(module, context_mvars.Types);
}
// When site container already exists the inflated version has to be
// updated manually to contain newly created field
if (gt is InflatedTypeSpec && site_container.AnonymousMethodsCounter > 1)
{
var tparams = gt.MemberDefinition.TypeParametersCount > 0 ? gt.MemberDefinition.TypeParameters : TypeParameterSpec.EmptyTypes;
var inflator = new TypeParameterInflator(module, gt, tparams, gt.TypeArguments);
gt.MemberCache.AddMember(field.InflateMember(inflator));
}
FieldExpr site_field_expr = new FieldExpr(MemberCache.GetMember(gt, field), loc);
BlockContext bc = new BlockContext(ec.MemberContext, null, ec.BuiltinTypes.Void);
Arguments args = new Arguments(1);
args.Add(new Argument(binder));
StatementExpression s = new StatementExpression(new SimpleAssign(site_field_expr, new Invocation(new MemberAccess(instanceAccessExprType, "Create"), args)));
using (ec.With(BuilderContext.Options.OmitDebugInfo, true)) {
if (s.Resolve(bc))
{
Statement init = new If(new Binary(Binary.Operator.Equality, site_field_expr, new NullLiteral(loc)), s, loc);
init.Emit(ec);
}
args = new Arguments(1 + dyn_args_count);
args.Add(new Argument(site_field_expr));
if (arguments != null)
{
int arg_pos = 1;
foreach (Argument a in arguments)
{
if (a is NamedArgument)
{
// Name is not valid in this context
args.Add(new Argument(a.Expr, a.ArgType));
}
else
{
args.Add(a);
}
if (inflate_using_mvar && a.Type != targs[arg_pos].Type)
{
a.Expr.Type = targs[arg_pos].Type;
}
++arg_pos;
}
}
Expression target = new DelegateInvocation(new MemberAccess(site_field_expr, "Target", loc).Resolve(bc), args, loc).Resolve(bc);
if (target != null)
{
target.Emit(ec);
}
}
}
protected void EmitCall (EmitContext ec, Expression binder, Arguments arguments, bool isStatement)
{
//
// This method generates all internal infrastructure for a dynamic call. The
// reason why it's quite complicated is the mixture of dynamic and anonymous
// methods. Dynamic itself requires a temporary class (ContainerX) and anonymous
// methods can generate temporary storey as well (AnonStorey). Handling MVAR
// type parameters rewrite is non-trivial in such case as there are various
// combinations possible therefore the mutator is not straightforward. Secondly
// we need to keep both MVAR(possibly VAR for anon storey) and type VAR to emit
// correct Site field type and its access from EmitContext.
//
int dyn_args_count = arguments == null ? 0 : arguments.Count;
int default_args = isStatement ? 1 : 2;
var module = ec.Module;
bool has_ref_out_argument = false;
var targs = new TypeExpression[dyn_args_count + default_args];
targs[0] = new TypeExpression (module.PredefinedTypes.CallSite.TypeSpec, loc);
TypeExpression[] targs_for_instance = null;
TypeParameterMutator mutator;
var site_container = ec.CreateDynamicSite ();
if (context_mvars != null) {
TypeParameters tparam;
TypeContainer sc = site_container;
do {
tparam = sc.CurrentTypeParameters;
sc = sc.Parent;
} while (tparam == null);
mutator = new TypeParameterMutator (context_mvars, tparam);
if (!ec.IsAnonymousStoreyMutateRequired) {
targs_for_instance = new TypeExpression[targs.Length];
targs_for_instance[0] = targs[0];
}
} else {
mutator = null;
}
for (int i = 0; i < dyn_args_count; ++i) {
Argument a = arguments[i];
if (a.ArgType == Argument.AType.Out || a.ArgType == Argument.AType.Ref)
has_ref_out_argument = true;
var t = a.Type;
// Convert any internal type like dynamic or null to object
if (t.Kind == MemberKind.InternalCompilerType)
t = ec.BuiltinTypes.Object;
if (targs_for_instance != null)
targs_for_instance[i + 1] = new TypeExpression (t, loc);
if (mutator != null)
t = t.Mutate (mutator);
targs[i + 1] = new TypeExpression (t, loc);
}
TypeExpr del_type = null;
TypeExpr del_type_instance_access = null;
if (!has_ref_out_argument) {
string d_name = isStatement ? "Action" : "Func";
TypeExpr te = null;
Namespace type_ns = module.GlobalRootNamespace.GetNamespace ("System", true);
if (type_ns != null) {
te = type_ns.LookupType (module, d_name, dyn_args_count + default_args, LookupMode.Normal, loc);
}
if (te != null) {
if (!isStatement) {
var t = type;
if (t.Kind == MemberKind.InternalCompilerType)
t = ec.BuiltinTypes.Object;
if (targs_for_instance != null)
targs_for_instance[targs_for_instance.Length - 1] = new TypeExpression (t, loc);
if (mutator != null)
t = t.Mutate (mutator);
targs[targs.Length - 1] = new TypeExpression (t, loc);
}
del_type = new GenericTypeExpr (te.Type, new TypeArguments (targs), loc);
if (targs_for_instance != null)
del_type_instance_access = new GenericTypeExpr (te.Type, new TypeArguments (targs_for_instance), loc);
else
del_type_instance_access = del_type;
}
}
//
// Create custom delegate when no appropriate predefined delegate has been found
//
Delegate d;
if (del_type == null) {
TypeSpec rt = isStatement ? ec.BuiltinTypes.Void : type;
Parameter[] p = new Parameter[dyn_args_count + 1];
p[0] = new Parameter (targs[0], "p0", Parameter.Modifier.NONE, null, loc);
var site = ec.CreateDynamicSite ();
int index = site.Containers == null ? 0 : site.Containers.Count;
if (mutator != null)
rt = mutator.Mutate (rt);
for (int i = 1; i < dyn_args_count + 1; ++i) {
p[i] = new Parameter (targs[i], "p" + i.ToString ("X"), arguments[i - 1].Modifier, null, loc);
}
d = new Delegate (site, new TypeExpression (rt, loc),
Modifiers.INTERNAL | Modifiers.COMPILER_GENERATED,
new MemberName ("Container" + index.ToString ("X")),
new ParametersCompiled (p), null);
d.CreateContainer ();
d.DefineContainer ();
d.Define ();
site.AddTypeContainer (d);
del_type = new TypeExpression (d.CurrentType, loc);
if (targs_for_instance != null) {
del_type_instance_access = null;
} else {
del_type_instance_access = del_type;
}
} else {
d = null;
}
var site_type_decl = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec, new TypeArguments (del_type), loc);
var field = site_container.CreateCallSiteField (site_type_decl, loc);
if (field == null)
return;
if (del_type_instance_access == null) {
var dt = d.CurrentType.DeclaringType.MakeGenericType (module, context_mvars.Types);
del_type_instance_access = new TypeExpression (MemberCache.GetMember (dt, d.CurrentType), loc);
}
var instanceAccessExprType = new GenericTypeExpr (module.PredefinedTypes.CallSiteGeneric.TypeSpec,
new TypeArguments (del_type_instance_access), loc);
if (instanceAccessExprType.ResolveAsType (ec.MemberContext) == null)
return;
bool inflate_using_mvar = context_mvars != null && ec.IsAnonymousStoreyMutateRequired;
TypeSpec gt;
if (inflate_using_mvar || context_mvars == null) {
gt = site_container.CurrentType;
} else {
gt = site_container.CurrentType.MakeGenericType (module, context_mvars.Types);
}
// When site container already exists the inflated version has to be
// updated manually to contain newly created field
if (gt is InflatedTypeSpec && site_container.AnonymousMethodsCounter > 1) {
var tparams = gt.MemberDefinition.TypeParametersCount > 0 ? gt.MemberDefinition.TypeParameters : TypeParameterSpec.EmptyTypes;
var inflator = new TypeParameterInflator (module, gt, tparams, gt.TypeArguments);
gt.MemberCache.AddMember (field.InflateMember (inflator));
}
FieldExpr site_field_expr = new FieldExpr (MemberCache.GetMember (gt, field), loc);
BlockContext bc = new BlockContext (ec.MemberContext, null, ec.BuiltinTypes.Void);
Arguments args = new Arguments (1);
args.Add (new Argument (binder));
StatementExpression s = new StatementExpression (new SimpleAssign (site_field_expr, new Invocation (new MemberAccess (instanceAccessExprType, "Create"), args)));
using (ec.With (BuilderContext.Options.OmitDebugInfo, true)) {
if (s.Resolve (bc)) {
Statement init = new If (new Binary (Binary.Operator.Equality, site_field_expr, new NullLiteral (loc)), s, loc);
init.Emit (ec);
}
args = new Arguments (1 + dyn_args_count);
args.Add (new Argument (site_field_expr));
if (arguments != null) {
int arg_pos = 1;
foreach (Argument a in arguments) {
if (a is NamedArgument) {
// Name is not valid in this context
args.Add (new Argument (a.Expr, a.ArgType));
} else {
args.Add (a);
}
if (inflate_using_mvar && a.Type != targs[arg_pos].Type)
a.Expr.Type = targs[arg_pos].Type;
++arg_pos;
}
}
Expression target = new DelegateInvocation (new MemberAccess (site_field_expr, "Target", loc).Resolve (bc), args, loc).Resolve (bc);
if (target != null)
target.Emit (ec);
}
}
void CreateAutomaticProperty ()
{
// Create backing field
BackingField = new BackingFieldDeclaration (this, Initializer == null && Set == null);
if (!BackingField.Define ())
return;
if (Initializer != null) {
BackingField.Initializer = Initializer;
Parent.RegisterFieldForInitialization (BackingField, new FieldInitializer (BackingField, Initializer, Location));
BackingField.ModFlags |= Modifiers.READONLY;
}
Parent.PartialContainer.Members.Add (BackingField);
FieldExpr fe = new FieldExpr (BackingField, Location);
if ((BackingField.ModFlags & Modifiers.STATIC) == 0)
fe.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
//
// Create get block but we careful with location to
// emit only single sequence point per accessor. This allow
// to set a breakpoint on it even with no user code
//
Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null);
Return r = new Return (fe, Get.Location);
Get.Block.AddStatement (r);
Get.ModFlags |= Modifiers.COMPILER_GENERATED;
// Create set block
if (Set != null) {
Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location.Null);
Assign a = new SimpleAssign (fe, new SimpleName ("value", Location.Null), Location.Null);
Set.Block.AddStatement (new StatementExpression (a, Set.Location));
Set.ModFlags |= Modifiers.COMPILER_GENERATED;
}
}
protected override Expression DoResolve(ResolveContext rc)
{
target = new FieldExpr(field, loc);
source = rc.CurrentBlock.ParametersBlock.GetParameterInfo(parameter).CreateReferenceExpression(rc, loc);
return(base.DoResolve(rc));
}
protected override void DoEmit (EmitContext ec)
{
Expression source;
if (parent == null)
source = new CompilerGeneratedThis (ec.CurrentType, loc);
else {
source = new FieldExpr (parent.HoistedThis.Field, Location.Null) {
InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location.Null)
};
}
hoisted_this.EmitAssign (ec, source, false, false);
}
void FabricateBodyStatement ()
{
//
// Delegate obj1 = backing_field
// do {
// Delegate obj2 = obj1;
// obj1 = Interlocked.CompareExchange (ref backing_field, Delegate.Combine|Remove(obj2, value), obj1);
// } while ((object)obj1 != (object)obj2)
//
var field_info = ((EventField) method).backing_field;
FieldExpr f_expr = new FieldExpr (field_info, Location);
if (!IsStatic)
f_expr.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
var obj1 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
var obj2 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
block.AddStatement (new StatementExpression (new SimpleAssign (new LocalVariableReference (obj1, Location), f_expr)));
var cond = new BooleanExpression (new Binary (Binary.Operator.Inequality,
new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj1, Location), Location),
new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj2, Location), Location)));
var body = new ExplicitBlock (block, Location, Location);
block.AddStatement (new Do (body, cond, Location, Location));
body.AddStatement (new StatementExpression (
new SimpleAssign (new LocalVariableReference (obj2, Location), new LocalVariableReference (obj1, Location))));
var args_oper = new Arguments (2);
args_oper.Add (new Argument (new LocalVariableReference (obj2, Location)));
args_oper.Add (new Argument (block.GetParameterReference (0, Location)));
var op_method = GetOperation (Location);
var args = new Arguments (3);
args.Add (new Argument (f_expr, Argument.AType.Ref));
args.Add (new Argument (new Cast (
new TypeExpression (field_info.MemberType, Location),
new Invocation (MethodGroupExpr.CreatePredefined (op_method, op_method.DeclaringType, Location), args_oper),
Location)));
args.Add (new Argument (new LocalVariableReference (obj1, Location)));
var cas = Module.PredefinedMembers.InterlockedCompareExchange_T.Resolve (Location);
if (cas == null)
return;
body.AddStatement (new StatementExpression (new SimpleAssign (
new LocalVariableReference (obj1, Location),
new Invocation (MethodGroupExpr.CreatePredefined (cas, cas.DeclaringType, Location), args))));
}
public void EmitPrologue(EmitContext ec)
{
awaiter = ((AsyncTaskStorey)machine_initializer.Storey).AddAwaiter(expr.Type);
var fe_awaiter = new FieldExpr(awaiter, loc);
fe_awaiter.InstanceExpression = new CompilerGeneratedThis(ec.CurrentType, loc);
Label skip_continuation = ec.DefineLabel();
using (ec.With(BuilderContext.Options.OmitDebugInfo, true)) {
//
// awaiter = expr.GetAwaiter ();
//
fe_awaiter.EmitAssign(ec, expr, false, false);
Expression completed_expr;
if (IsDynamic)
{
var rc = new ResolveContext(ec.MemberContext);
Arguments dargs = new Arguments(1);
dargs.Add(new Argument(fe_awaiter));
completed_expr = new DynamicMemberBinder("IsCompleted", dargs, loc).Resolve(rc);
dargs = new Arguments(1);
dargs.Add(new Argument(completed_expr));
completed_expr = new DynamicConversion(ec.Module.Compiler.BuiltinTypes.Bool, 0, dargs, loc).Resolve(rc);
}
else
{
var pe = PropertyExpr.CreatePredefined(awaiter_definition.IsCompleted, loc);
pe.InstanceExpression = fe_awaiter;
completed_expr = pe;
}
completed_expr.EmitBranchable(ec, skip_continuation, true);
}
base.DoEmit(ec);
//
// The stack has to be empty before calling await continuation. We handle this
// by lifting values which would be left on stack into class fields. The process
// is quite complicated and quite hard to test because any expression can possibly
// leave a value on the stack.
//
// Following assert fails when some of expression called before is missing EmitToField
// or parent expression fails to find await in children expressions
//
ec.AssertEmptyStack();
var storey = (AsyncTaskStorey)machine_initializer.Storey;
if (IsDynamic)
{
storey.EmitAwaitOnCompletedDynamic(ec, fe_awaiter);
}
else
{
storey.EmitAwaitOnCompleted(ec, fe_awaiter);
}
// Return ok
machine_initializer.EmitLeave(ec, unwind_protect);
ec.MarkLabel(resume_point);
ec.MarkLabel(skip_continuation);
}
//
// Creates storey instance expression regardless of currect IP
//
public Expression GetStoreyInstanceExpression (EmitContext ec)
{
AnonymousExpression am = ec.CurrentAnonymousMethod;
//
// Access from original block -> storey
//
if (am == null)
return Instance;
//
// Access from anonymous method implemented as a static -> storey
//
if (am.Storey == null)
return Instance;
Field f = am.Storey.GetReferencedStoreyField (this);
if (f == null) {
if (am.Storey == this) {
//
// Access from inside of same storey (S -> S)
//
return new CompilerGeneratedThis (CurrentType, Location);
}
//
// External field access
//
return Instance;
}
//
// Storey was cached to local field
//
FieldExpr f_ind = new FieldExpr (f, Location);
f_ind.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
return f_ind;
}
protected virtual void EmitHoistedParameters (EmitContext ec, List<HoistedParameter> hoisted)
{
foreach (HoistedParameter hp in hoisted) {
if (hp == null)
continue;
//
// Parameters could be proxied via local fields for value type storey
//
if (hoisted_local_params != null) {
var local_param = hoisted_local_params.Find (l => l.Parameter.Parameter == hp.Parameter.Parameter);
var source = new FieldExpr (local_param.Field, Location);
source.InstanceExpression = new CompilerGeneratedThis (CurrentType, Location);
hp.EmitAssign (ec, source, false, false);
continue;
}
hp.EmitHoistingAssignment (ec);
}
}
void EmitHoistedFieldsInitialization (ResolveContext rc, EmitContext ec)
{
//
// Initialize all storey reference fields by using local or hoisted variables
//
if (used_parent_storeys != null) {
foreach (StoreyFieldPair sf in used_parent_storeys) {
//
// Get instance expression of storey field
//
Expression instace_expr = GetStoreyInstanceExpression (ec);
var fs = sf.Field.Spec;
if (TypeManager.IsGenericType (instace_expr.Type))
fs = MemberCache.GetMember (instace_expr.Type, fs);
FieldExpr f_set_expr = new FieldExpr (fs, Location);
f_set_expr.InstanceExpression = instace_expr;
// TODO: CompilerAssign expression
SimpleAssign a = new SimpleAssign (f_set_expr, sf.Storey.GetStoreyInstanceExpression (ec));
if (a.Resolve (rc) != null)
a.EmitStatement (ec);
}
}
//
// Initialize hoisted `this' only once, everywhere else will be
// referenced indirectly
//
if (initialize_hoisted_this) {
rc.CurrentBlock.AddScopeStatement (new ThisInitializer (hoisted_this, hoisted_this_parent));
}
//
// Setting currect anonymous method to null blocks any further variable hoisting
//
AnonymousExpression ae = ec.CurrentAnonymousMethod;
ec.CurrentAnonymousMethod = null;
if (hoisted_params != null) {
EmitHoistedParameters (ec, hoisted_params);
}
ec.CurrentAnonymousMethod = ae;
}
//
// Initializes all hoisted variables
//
public void EmitStoreyInstantiation (EmitContext ec, ExplicitBlock block)
{
// There can be only one instance variable for each storey type
if (Instance != null)
throw new InternalErrorException ();
//
// Create an instance of this storey
//
ResolveContext rc = new ResolveContext (ec.MemberContext);
rc.CurrentBlock = block;
var storey_type_expr = CreateStoreyTypeExpression (ec);
var source = new New (storey_type_expr, null, Location).Resolve (rc);
//
// When the current context is async (or iterator) lift local storey
// instantiation to the currect storey
//
if (ec.CurrentAnonymousMethod is StateMachineInitializer && (block.HasYield || block.HasAwait)) {
//
// Unfortunately, normal capture mechanism could not be used because we are
// too late in the pipeline and standart assign cannot be used either due to
// recursive nature of GetStoreyInstanceExpression
//
var field = ec.CurrentAnonymousMethod.Storey.AddCompilerGeneratedField (
LocalVariable.GetCompilerGeneratedName (block), storey_type_expr, true);
field.Define ();
field.Emit ();
var fexpr = new FieldExpr (field, Location);
fexpr.InstanceExpression = new CompilerGeneratedThis (ec.CurrentType, Location);
fexpr.EmitAssign (ec, source, false, false);
Instance = fexpr;
} else {
var local = TemporaryVariableReference.Create (source.Type, block, Location);
if (source.Type.IsStruct) {
local.LocalInfo.CreateBuilder (ec);
} else {
local.EmitAssign (ec, source);
}
Instance = local;
}
EmitHoistedFieldsInitialization (rc, ec);
// TODO: Implement properly
//SymbolWriter.DefineScopeVariable (ID, Instance.Builder);
}
void CreateAutomaticProperty ()
{
// Create backing field
Field field = new BackingField (this);
if (!field.Define ())
return;
Parent.PartialContainer.Members.Add (field);
FieldExpr fe = new FieldExpr (field, Location);
if ((field.ModFlags & Modifiers.STATIC) == 0)
fe.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
//
// Create get block but we careful with location to
// emit only single sequence point per accessor. This allow
// to set a breakpoint on it even with no user code
//
Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null);
Return r = new Return (fe, Get.Location);
Get.Block.AddStatement (r);
// Create set block
Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location.Null);
Assign a = new SimpleAssign (fe, new SimpleName ("value", Location.Null), Location.Null);
Set.Block.AddStatement (new StatementExpression (a, Set.Location));
}
protected override Expression DoResolve (ResolveContext rc)
{
target = new FieldExpr (field, loc);
source = rc.CurrentBlock.ParametersBlock.GetParameterInfo (parameter).CreateReferenceExpression (rc, loc);
return base.DoResolve (rc);
}
