private Expression InlineIfTrueIfFalse(Compiler.SemanticNodes.BlockNode trueBlock, Compiler.SemanticNodes.BlockNode falseBlock)
{
NameBinding nilBinding = this.Context.GetBinding(SemanticConstants.Nil);
Expression testExpression = Expression.Convert(this.Receiver, typeof(bool));
Expression trueExpression;
if (trueBlock != null)
{
trueExpression = trueBlock.Accept(new InlineBlockVisitor(this));
}
else
{
trueExpression = nilBinding.GenerateReadExpression(this);
}
Expression falseExpression;
if (falseBlock != null)
{
falseExpression = falseBlock.Accept(new InlineBlockVisitor(this));
}
else
{
falseExpression = nilBinding.GenerateReadExpression(this);
}
Expression result = Expression.Condition(testExpression, trueExpression, falseExpression, typeof(object));
this.SetResult(result);
return(result);
}
protected virtual void DefineArguments(Compiler.SemanticNodes.BlockNode node)
{
for (int i = 0; i < node.Arguments.Count; i++)
{
this.Context.DefineArgument(node.Arguments[i].Token.Value);
}
}
public override Expression VisitBlock(Compiler.SemanticNodes.BlockNode node)
{
for (int i = 0; i < node.Arguments.Count; i++)
{
string name = node.Arguments[i].Token.Value;
// This is used by the inlined blocks.
// If already defined, do not define it twice ... because it's given externally.
// See: DefineExternalArgument
if (this.Context.LocalScope.GetBinding(name) != null)
{
continue;
}
this.Context.DefineArgument(name);
}
foreach (TemporaryVariableNode tmp in node.Temporaries)
{
this.Context.DefineTemporary(tmp.Token.Value);
}
List <Expression> expressions = new List <Expression>();
NameBinding nilBinding = this.Context.GetBinding(SemanticConstants.Nil);
// On each execution init all temp-vars with nil
foreach (TemporaryBinding tmp in this.Context.Temporaries)
{
expressions.Add(tmp.GenerateAssignExpression(nilBinding.GenerateReadExpression(this), this));
}
StatementVisitor visitor = new StatementVisitor(this);
if (node.Statements != null)
{
expressions.AddRange(node.Statements.Accept(visitor));
}
if (expressions.Count == 0)
{
expressions.Add(nilBinding.GenerateReadExpression(this));
}
#if DEBUG
if (expressions.Count == 0)
{
throw new InternalCodeGenerationException("We did expect at least ONE expression");
}
foreach (var expr in expressions)
{
if (expr.Type != typeof(object))
{
throw new InternalCodeGenerationException(String.Format("Expression does not return object! \n{0}", expr));
}
}
#endif
return(this.Context.GeneratePrologAndEpilogue(expressions));
}
private Expression InlineOr(Compiler.SemanticNodes.BlockNode block)
{
NameBinding trueBinding = this.Context.GetBinding(SemanticConstants.True);
Expression testExpression = Expression.Convert(this.Receiver, typeof(bool));
Expression blockExpression = block.Accept(new InlineBlockVisitor(this));
Expression result = Expression.Condition(testExpression, trueBinding.GenerateReadExpression(this), blockExpression, typeof(object));
this.SetResult(result);
return(result);
}
private Expression InlineTimesRepeat(Compiler.SemanticNodes.BlockNode block)
{
/// timesRepeat: aBlock
/// Inlines to:
/// 1 to: self by: 1 do: aBlock
return(this.InlineToByDo(
Expression.Constant(1, typeof(int)),
this.Receiver,
Expression.Constant(1, typeof(int)),
block));
}
private Expression InlineToByDo(Expression start, Expression stop, Expression step, Compiler.SemanticNodes.BlockNode block)
{
/// to:by:do:
/* C# semantics of the inlining
* if ((start is int) && (stop is int) && (step is int))
* {
* int iStart, iStop, iStep;
* try
* {
* iStart = checked((int)start);
* iStop = checked((int)stop);
* iStep = checked((int)step);
* // This is to ensure the calculation below do not fail running unchecked
* int na = checked(iStart + iStep);
* na = checked(iStop + iStep);
* }
* catch (OverflowException)
* {
* goto Int32Overwlow;
* }
*
* if (iStep == 0)
* throw new ArgumentOutOfRangeException();
*
* if (iStep > 0)
* {
* do
* {
* if (iStart > iStop)
* goto Exit;
* block(iStart);
* iStart = iStart + iStep;
* } while (true);
* }
* else
* {
* do
* {
* if (iStop > iStart)
* goto Exit;
* block(iStart);
* iStart = iStart + iStep;
* } while (true);
* }
* }
* Int32Overwlow:
* // We could implement BigInteger optimization here, but too much work and probably not much to gain
* // Fallback to dynamic invocation
* dynamic dStart = start;
* dynamic dStep = step;
* if (dStep == 0)
* throw new ArgumentOutOfRangeException();
*
* if (dStep > 0)
* {
* do
* {
* if (dStart > stop)
* goto Exit;
* block(dStart);
* dStart = dStart + step;
* } while (true);
* }
* else
* {
* do
* {
* if (stop > dStart)
* goto Exit;
* block(dStart);
* dStart = dStart + step;
* } while (true);
* }
* Exit:
*/
NameBinding nilBinding = this.Context.GetBinding(SemanticConstants.Nil);
LabelTarget exitLabel = Expression.Label(typeof(void));
LabelTarget overflowLabel = Expression.Label(typeof(void));
ParameterExpression iStart = Expression.Variable(typeof(int), "iStart");
ParameterExpression iStop = Expression.Variable(typeof(int), "iStop");
ParameterExpression iStep = Expression.Variable(typeof(int), "iStep");
ParameterExpression iNA = Expression.Variable(typeof(int), "iNA");
InlineBlockVisitor visitor = new InlineBlockVisitor(this);
if (block.Arguments.Count > 0)
{
visitor.DefineExternalArgument(block.Arguments[0].Token.Value, Expression.Convert(iStart, typeof(object)));
}
Expression integerOperation = block.Accept(visitor);
Expression integerTest = Expression.AndAlso(Expression.AndAlso(
Expression.TypeIs(start, typeof(int)), Expression.TypeIs(stop, typeof(int))), Expression.TypeIs(step, typeof(int)));
Expression integerBlock = Expression.Block(
Expression.TryCatch(
Expression.Block(
Expression.Assign(iStart, Expression.ConvertChecked(start, typeof(int))),
Expression.Assign(iStop, Expression.ConvertChecked(stop, typeof(int))),
Expression.Assign(iStep, Expression.ConvertChecked(step, typeof(int))),
Expression.Assign(iNA, Expression.AddChecked(iStart, iStep)),
Expression.Assign(iNA, Expression.AddChecked(iStop, iStep))),
Expression.Catch(typeof(OverflowException), Expression.Goto(overflowLabel, typeof(int))),
Expression.Catch(typeof(InvalidCastException), Expression.Goto(overflowLabel, typeof(int)))),
Expression.IfThen(
Expression.Equal(iStep, Expression.Constant(0)),
Expression.Throw(Expression.New(typeof(ArgumentOutOfRangeException)), typeof(object))),
Expression.IfThenElse(
Expression.GreaterThan(iStep, Expression.Constant(0)),
Expression.Loop(
Expression.IfThenElse(
Expression.GreaterThan(iStart, iStop),
Expression.Break(exitLabel, nilBinding.GenerateReadExpression(this)),
Expression.Block(
integerOperation,
Expression.AddAssign(iStart, iStep)))),
Expression.Loop(
Expression.IfThenElse(
Expression.GreaterThan(iStop, iStart),
Expression.Break(exitLabel, nilBinding.GenerateReadExpression(this)),
Expression.Block(
integerOperation,
Expression.AddAssign(iStart, iStep))))));
ParameterExpression dStart = Expression.Variable(typeof(object), "dStart");
ParameterExpression dStep = Expression.Variable(typeof(object), "dStep");
visitor = new InlineBlockVisitor(this);
if (block.Arguments.Count > 0)
{
visitor.DefineExternalArgument(block.Arguments[0].Token.Value, dStart);
}
Expression dynamicOperation = block.Accept(visitor);
Expression dynamicBlock = Expression.Block(
Expression.Assign(dStart, start),
Expression.Assign(dStep, Expression.Convert(step, typeof(object))),
Expression.IfThen(
Expression.IsTrue(Expression.Convert(this.Context.CompileDynamicCall(this, "=", dStep, PreboxedConstants.Int32_00000000_Expression), typeof(bool))),
Expression.Throw(Expression.New(typeof(ArgumentOutOfRangeException)), typeof(object))),
Expression.IfThenElse(
Expression.IsTrue(Expression.Convert(this.Context.CompileDynamicCall(this, ">", dStep, PreboxedConstants.Int32_00000000_Expression), typeof(bool))),
Expression.Loop(
Expression.IfThenElse(
Expression.IsTrue(Expression.Convert(this.Context.CompileDynamicCall(this, ">", dStart, stop), typeof(bool))),
Expression.Break(exitLabel, nilBinding.GenerateReadExpression(this)),
Expression.Block(
dynamicOperation,
Expression.Assign(dStart, this.Context.CompileDynamicCall(this, "+", dStart, dStep))))),
Expression.Loop(
Expression.IfThenElse(
Expression.IsTrue(Expression.Convert(this.Context.CompileDynamicCall(this, ">", stop, dStart), typeof(bool))),
Expression.Break(exitLabel, nilBinding.GenerateReadExpression(this)),
Expression.Block(
dynamicOperation,
Expression.Assign(dStart, this.Context.CompileDynamicCall(this, "+", dStart, dStep)))))));
return(Expression.Block(
new ParameterExpression[] { iStart, iStop, iStep, iNA, dStart, dStep },
integerBlock,
Expression.Label(overflowLabel),
dynamicBlock,
Expression.Label(exitLabel),
nilBinding.GenerateReadExpression(this)));
}
private Expression InlineToByDo(Compiler.SemanticNodes.KeywordArgumentNode stop, Compiler.SemanticNodes.KeywordArgumentNode by, Compiler.SemanticNodes.BlockNode block)
{
return(this.InlineToByDo(this.Receiver, stop.Accept(this), by.Accept(this), block));
}
private Expression InlineToDo(Compiler.SemanticNodes.KeywordArgumentNode stop, Compiler.SemanticNodes.BlockNode block)
{
/// to: stop do: aBlock
/// Inlines to:
/// self to: stop by: 1 do: aBlock
return(this.InlineToByDo(this.Receiver, stop.Accept(this), Expression.Constant(1, typeof(int)), block));
}
private Expression InlineMessageSend(Compiler.SemanticNodes.KeywordMessageSequenceNode node)
{
if (this.CascadeReceiver != null)
{
return(null);
}
if (this.IsSuperSend)
{
return(null);
}
if ((node.Message.SelectorTokens.Count == 1) && (node.Message.Arguments.Count == 1))
{
Compiler.SemanticNodes.BlockNode block = node.Message.Arguments[0].Primary as Compiler.SemanticNodes.BlockNode;
if ((block != null) && (block.Arguments.Count == 0) && (node.Message.Arguments[0].Messages == null))
{
if (node.Message.SelectorTokens[0].Value == "ifTrue:")
{
return(this.InlineIfTrueIfFalse(block, null));
}
if (node.Message.SelectorTokens[0].Value == "ifFalse:")
{
return(this.InlineIfTrueIfFalse(null, block));
}
if (node.Message.SelectorTokens[0].Value == "and:")
{
return(this.InlineAnd(block));
}
if (node.Message.SelectorTokens[0].Value == "or:")
{
return(this.InlineOr(block));
}
if (node.Message.SelectorTokens[0].Value == "timesRepeat:")
{
return(this.InlineTimesRepeat(block));
}
}
}
else if ((node.Message.SelectorTokens.Count == 2) && (node.Message.Arguments.Count == 2))
{
Compiler.SemanticNodes.BlockNode block1 = node.Message.Arguments[0].Primary as Compiler.SemanticNodes.BlockNode;
Compiler.SemanticNodes.BlockNode block2 = node.Message.Arguments[1].Primary as Compiler.SemanticNodes.BlockNode;
if ((block1 != null) && (block1.Arguments.Count == 0) && (node.Message.Arguments[0].Messages == null))
{
if ((block2 != null) && (block2.Arguments.Count == 0) && (node.Message.Arguments[1].Messages == null))
{
if ((node.Message.SelectorTokens[0].Value == "ifTrue:") && (node.Message.SelectorTokens[1].Value == "ifFalse:"))
{
return(this.InlineIfTrueIfFalse(block1, block2));
}
if ((node.Message.SelectorTokens[0].Value == "ifFalse:") && (node.Message.SelectorTokens[1].Value == "ifTrue:"))
{
return(this.InlineIfTrueIfFalse(block2, block1));
}
}
}
if ((block2 != null) && (block2.Arguments.Count == 1) && (node.Message.Arguments[1].Messages == null))
{
if ((node.Message.SelectorTokens[0].Value == "to:") && (node.Message.SelectorTokens[1].Value == "do:"))
{
return(this.InlineToDo(node.Message.Arguments[0], block2));
}
}
}
else if ((node.Message.SelectorTokens.Count == 3) && (node.Message.Arguments.Count == 3))
{
Compiler.SemanticNodes.BlockNode block = node.Message.Arguments[2].Primary as Compiler.SemanticNodes.BlockNode;
if ((block != null) && (block.Arguments.Count == 1) && (node.Message.Arguments[2].Messages == null))
{
if ((node.Message.SelectorTokens[0].Value == "to:") && (node.Message.SelectorTokens[1].Value == "by:") && (node.Message.SelectorTokens[2].Value == "do:"))
{
return(this.InlineToByDo(node.Message.Arguments[0], node.Message.Arguments[1], block));
}
}
}
return(null);
}
