public void EmitToVariable(EmitContext ec)
{
var type = Expr.Type;
if (IsByRef)
{
var ml = (IMemoryLocation)Expr;
ml.AddressOf(ec, AddressOp.LoadStore);
type = ReferenceContainer.MakeType(ec.Module, type);
}
else
{
Expr.Emit(ec);
}
variable = new LocalTemporary(type);
variable.Store(ec);
Expr = variable;
}
//
// if `dup_args' is true or any of arguments contains await.
// A copy of all arguments will be returned to the caller
//
public virtual Arguments Emit (EmitContext ec, bool dup_args, bool prepareAwait)
{
List<Argument> dups;
if ((dup_args && Count != 0) || prepareAwait)
dups = new List<Argument> (Count);
else
dups = null;
LocalTemporary lt;
foreach (Argument a in args) {
if (prepareAwait) {
dups.Add (a.EmitToField (ec, true));
continue;
}
a.Emit (ec);
if (!dup_args) {
continue;
}
if (a.Expr.IsSideEffectFree) {
//
// No need to create a temporary variable for side effect free expressions. I assume
// all side-effect free expressions are cheap, this has to be tweaked when we become
// more aggressive on detection
//
dups.Add (a);
} else {
ec.Emit (OpCodes.Dup);
// TODO: Release local temporary on next Emit
// Need to add a flag to argument to indicate this
lt = new LocalTemporary (a.Type);
lt.Store (ec);
dups.Add (new Argument (lt, a.ArgType));
}
}
if (dups != null)
return new Arguments (dups);
return null;
}
public void EmitToVariable (EmitContext ec)
{
var type = Expr.Type;
if (IsByRef) {
var ml = (IMemoryLocation) Expr;
ml.AddressOf (ec, AddressOp.LoadStore);
type = ReferenceContainer.MakeType (ec.Module, type);
} else {
Expr.Emit (ec);
}
variable = new LocalTemporary (type);
variable.Store (ec);
Expr = variable;
}
public void EmitPredefined (EmitContext ec, MethodSpec method, Arguments Arguments, Location? loc = null)
{
Expression instance_copy = null;
if (!HasAwaitArguments && ec.HasSet (BuilderContext.Options.AsyncBody)) {
HasAwaitArguments = Arguments != null && Arguments.ContainsEmitWithAwait ();
if (HasAwaitArguments && InstanceExpressionOnStack) {
throw new NotSupportedException ();
}
}
OpCode call_op;
LocalTemporary lt = null;
if (method.IsStatic) {
call_op = OpCodes.Call;
} else {
if (IsVirtualCallRequired (InstanceExpression, method)) {
call_op = OpCodes.Callvirt;
} else {
call_op = OpCodes.Call;
}
if (HasAwaitArguments) {
instance_copy = InstanceExpression.EmitToField (ec);
if (Arguments == null)
EmitCallInstance (ec, instance_copy, method.DeclaringType, call_op);
} else if (!InstanceExpressionOnStack) {
var instance_on_stack_type = EmitCallInstance (ec, InstanceExpression, method.DeclaringType, call_op);
if (DuplicateArguments) {
ec.Emit (OpCodes.Dup);
if (Arguments != null && Arguments.Count != 0) {
lt = new LocalTemporary (instance_on_stack_type);
lt.Store (ec);
instance_copy = lt;
}
}
}
}
if (Arguments != null && !InstanceExpressionOnStack) {
EmittedArguments = Arguments.Emit (ec, DuplicateArguments, HasAwaitArguments);
if (EmittedArguments != null) {
if (instance_copy != null) {
EmitCallInstance (ec, instance_copy, method.DeclaringType, call_op);
if (lt != null)
lt.Release (ec);
}
EmittedArguments.Emit (ec);
}
}
if (call_op == OpCodes.Callvirt && (InstanceExpression.Type.IsGenericParameter || InstanceExpression.Type.IsStruct)) {
ec.Emit (OpCodes.Constrained, InstanceExpression.Type);
}
if (loc != null) {
//
// Emit explicit sequence point for expressions like Foo.Bar () to help debugger to
// break at right place when LHS expression can be stepped-into
//
// TODO: The list is probably not comprehensive, need to do more testing
//
if (InstanceExpression is PropertyExpr || InstanceExpression is Invocation || InstanceExpression is IndexerExpr ||
InstanceExpression is New || InstanceExpression is DelegateInvocation)
ec.Mark (loc.Value);
}
//
// Set instance expression to actual result expression. When it contains await it can be
// picked up by caller
//
InstanceExpression = instance_copy;
if (method.Parameters.HasArglist) {
var varargs_types = GetVarargsTypes (method, Arguments);
ec.Emit (call_op, method, varargs_types);
return;
}
//
// If you have:
// this.DoFoo ();
// and DoFoo is not virtual, you can omit the callvirt,
// because you don't need the null checking behavior.
//
ec.Emit (call_op, method);
}
static TypeSpec EmitCallInstance (EmitContext ec, Expression instance, TypeSpec declaringType, OpCode callOpcode)
{
var instance_type = instance.Type;
//
// Push the instance expression
//
if ((instance_type.IsStruct && (callOpcode == OpCodes.Callvirt || (callOpcode == OpCodes.Call && declaringType.IsStruct))) ||
instance_type.IsGenericParameter || declaringType.IsNullableType) {
//
// If the expression implements IMemoryLocation, then
// we can optimize and use AddressOf on the
// return.
//
// If not we have to use some temporary storage for
// it.
var iml = instance as IMemoryLocation;
if (iml != null) {
iml.AddressOf (ec, AddressOp.Load);
} else {
LocalTemporary temp = new LocalTemporary (instance_type);
instance.Emit (ec);
temp.Store (ec);
temp.AddressOf (ec, AddressOp.Load);
}
return ReferenceContainer.MakeType (ec.Module, instance_type);
}
if (instance_type.IsEnum || instance_type.IsStruct) {
instance.Emit (ec);
ec.Emit (OpCodes.Box, instance_type);
return ec.BuiltinTypes.Object;
}
instance.Emit (ec);
return instance_type;
}
public void EmitPredefined(EmitContext ec, MethodSpec method, Arguments Arguments, Location?loc = null)
{
Expression instance_copy = null;
if (!HasAwaitArguments && ec.HasSet(BuilderContext.Options.AsyncBody))
{
HasAwaitArguments = Arguments != null && Arguments.ContainsEmitWithAwait();
if (HasAwaitArguments && InstanceExpressionOnStack)
{
throw new NotSupportedException();
}
}
OpCode call_op;
LocalTemporary lt = null;
if (method.IsStatic)
{
call_op = OpCodes.Call;
}
else
{
if (IsVirtualCallRequired(InstanceExpression, method))
{
call_op = OpCodes.Callvirt;
}
else
{
call_op = OpCodes.Call;
}
if (HasAwaitArguments)
{
instance_copy = InstanceExpression.EmitToField(ec);
if (Arguments == null)
{
EmitCallInstance(ec, instance_copy, method.DeclaringType, call_op);
}
}
else if (!InstanceExpressionOnStack)
{
var instance_on_stack_type = EmitCallInstance(ec, InstanceExpression, method.DeclaringType, call_op);
if (DuplicateArguments)
{
ec.Emit(OpCodes.Dup);
if (Arguments != null && Arguments.Count != 0)
{
lt = new LocalTemporary(instance_on_stack_type);
lt.Store(ec);
instance_copy = lt;
}
}
}
}
if (Arguments != null && !InstanceExpressionOnStack)
{
EmittedArguments = Arguments.Emit(ec, DuplicateArguments, HasAwaitArguments);
if (EmittedArguments != null)
{
if (instance_copy != null)
{
EmitCallInstance(ec, instance_copy, method.DeclaringType, call_op);
if (lt != null)
{
lt.Release(ec);
}
}
EmittedArguments.Emit(ec);
}
}
if (call_op == OpCodes.Callvirt && (InstanceExpression.Type.IsGenericParameter || InstanceExpression.Type.IsStruct))
{
ec.Emit(OpCodes.Constrained, InstanceExpression.Type);
}
if (loc != null)
{
//
// Emit explicit sequence point for expressions like Foo.Bar () to help debugger to
// break at right place when LHS expression can be stepped-into
//
// TODO: The list is probably not comprehensive, need to do more testing
//
if (InstanceExpression is PropertyExpr || InstanceExpression is Invocation || InstanceExpression is IndexerExpr ||
InstanceExpression is New || InstanceExpression is DelegateInvocation)
{
ec.Mark(loc.Value);
}
}
//
// Set instance expression to actual result expression. When it contains await it can be
// picked up by caller
//
InstanceExpression = instance_copy;
if (method.Parameters.HasArglist)
{
var varargs_types = GetVarargsTypes(method, Arguments);
ec.Emit(call_op, method, varargs_types);
return;
}
//
// If you have:
// this.DoFoo ();
// and DoFoo is not virtual, you can omit the callvirt,
// because you don't need the null checking behavior.
//
ec.Emit(call_op, method);
}
