diff --git a/ASTPlayground/ASTPlayground.delphilsp.json b/ASTPlayground/ASTPlayground.delphilsp.json
index e5c909b..83c4b49 100644
--- a/ASTPlayground/ASTPlayground.delphilsp.json
+++ b/ASTPlayground/ASTPlayground.delphilsp.json
@@ -1 +1 @@
-{ "settings": { "project": "file:///T%3A/Myc/ASTPlayground/ASTPlayground.dpr", "dllname": "dcc64370.dll", "dccOptions": "-$O- -$W+ --inline:off -$R+ -$Q+ --no-config -Q -TX.exe -AGenerics.Collections=System.Generics.Collections;Generics.Defaults=System.Generics.Defaults;WinTypes=Winapi.Windows;WinProcs=Winapi.Windows;DbiTypes=BDE;DbiProcs=BDE;DbiErrs=BDE -DDEBUG;;FRAMEWORK_FMX -E.\\Win64\\Debug -I\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\debug\\DE\";\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\debug\";\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\release\\DE\";T:\\Myc\\Src\\Data;T:\\Myc\\Src\\AST;T:\\Myc\\Src;\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\release\";C:\\Users\\Brummel\\Documents\\Embarcadero\\Studio\\37.0\\Imports\\Win64;\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\Imports\";C:\\Users\\Public\\Documents\\Embarcadero\\Studio\\37.0\\Dcp\\Win64;\"c:\\program files 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(x86)\\embarcadero\\studio\\37.0\\source\\DUnitX\" -R\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\release\\DE\";T:\\Myc\\Src\\Data;T:\\Myc\\Src\\AST;T:\\Myc\\Src;\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\lib\\Win64\\release\";C:\\Users\\Brummel\\Documents\\Embarcadero\\Studio\\37.0\\Imports\\Win64;\"c:\\program files (x86)\\embarcadero\\studio\\37.0\\Imports\";C:\\Users\\Public\\Documents\\Embarcadero\\Studio\\37.0\\Dcp\\Win64;\"c:\\program files 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diff --git a/ASTPlayground/ASTPlayground.dpr b/ASTPlayground/ASTPlayground.dpr
index f108b5d..1a55753 100644
--- a/ASTPlayground/ASTPlayground.dpr
+++ b/ASTPlayground/ASTPlayground.dpr
@@ -25,7 +25,8 @@ uses
Myc.Ast.Binding.Nodes in '..\Src\AST\Myc.Ast.Binding.Nodes.pas',
Myc.Ast.MacroExpander in '..\Src\AST\Myc.Ast.MacroExpander.pas',
Myc.Ast.TypeChecker in '..\Src\AST\Myc.Ast.TypeChecker.pas',
- Myc.Ast.Lowering in '..\Src\AST\Myc.Ast.Lowering.pas';
+ Myc.Ast.Lowering in '..\Src\AST\Myc.Ast.Lowering.pas',
+ Myc.Ast.Compiler.TCO in '..\Src\AST\Myc.Ast.Compiler.TCO.pas';
{$R *.res}
diff --git a/ASTPlayground/ASTPlayground.dproj b/ASTPlayground/ASTPlayground.dproj
index f1ca482..a8cef81 100644
--- a/ASTPlayground/ASTPlayground.dproj
+++ b/ASTPlayground/ASTPlayground.dproj
@@ -156,6 +156,7 @@
+
Base
diff --git a/ASTPlayground/MainForm.pas b/ASTPlayground/MainForm.pas
index ef86dd4..e538b35 100644
--- a/ASTPlayground/MainForm.pas
+++ b/ASTPlayground/MainForm.pas
@@ -41,6 +41,7 @@ uses
Myc.Ast.MacroExpander,
Myc.Ast.TypeChecker,
Myc.Ast.Lowering,
+ Myc.Ast.Compiler.TCO,
FMX.DialogService,
FMX.ListView.Types,
FMX.ListView.Appearances,
@@ -214,7 +215,7 @@ end;
function TForm1.CompileAst(const ANode: IAstNode; const AParentScope: IExecutionScope; out ADescriptor: IScopeDescriptor): IAstNode;
var
macroDescriptor: IScopeDescriptor;
- expandedAst, boundAst, typedAst: IAstNode;
+ expandedAst, boundAst, typedAst, loweredAst: IAstNode;
begin
// Step 1: Expand macros (Phase 1)
expandedAst := TMacroExpander.ExpandMacros(AParentScope, ANode, macroDescriptor, CreateEvaluator);
@@ -226,7 +227,10 @@ begin
typedAst := TTypeChecker.CheckTypes(boundAst, ADescriptor);
// Step 4: Lowering / Canonicalization (Phase 4)
- Result := TAstLowerer.Lower(typedAst);
+ loweredAst := TAstLowerer.Lower(typedAst);
+
+ // Step 5: Tail Call Optimization (Phase 5)
+ Result := TAstTCO.Optimize(loweredAst);
end;
function TForm1.ExecuteAst(const ANode: IAstNode; const AParentScope: IExecutionScope): TDataValue;
diff --git a/Src/AST/Myc.Ast.Compiler.TCO.pas b/Src/AST/Myc.Ast.Compiler.TCO.pas
new file mode 100644
index 0000000..8a73343
--- /dev/null
+++ b/Src/AST/Myc.Ast.Compiler.TCO.pas
@@ -0,0 +1,209 @@
+unit Myc.Ast.Compiler.TCO;
+
+interface
+
+uses
+ System.SysUtils,
+ System.Classes,
+ System.Generics.Collections,
+ Myc.Data.Value,
+ Myc.Ast.Nodes,
+ Myc.Ast.Visitor,
+ Myc.Ast.Scope,
+ Myc.Ast.Types,
+ Myc.Ast,
+ Myc.Ast.Binding.Nodes;
+
+type
+ IAstTCO = interface(IAstVisitor)
+ function Execute(const RootNode: IAstNode): IAstNode;
+ end;
+
+ // This transformer runs *after* the Lowerer (Phase 4).
+ // Its sole responsibility is to identify tail calls (TCO)
+ // and set the `IsTailCall` flag on TBoundFunctionCallNode.
+ TAstTCO = class(TAstTransformer, IAstTCO)
+ private
+ FIsTailStack: TStack;
+ FNextIsTail: Boolean;
+ protected
+ function Accept(const Node: IAstNode): TDataValue; override;
+ // Overrides for TCO propagation
+ function VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue; override;
+ function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
+ function VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue; override;
+ function VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue; override;
+ function VisitRecurNode(const Node: IRecurNode): TDataValue; override;
+ function VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue; override;
+ // The core TCO logic
+ function VisitFunctionCall(const Node: IFunctionCallNode): TDataValue; override;
+ public
+ constructor Create;
+ destructor Destroy; override;
+ function Execute(const RootNode: IAstNode): IAstNode;
+
+ class function Optimize(const RootNode: IAstNode): IAstNode; static;
+ end;
+
+implementation
+
+{ TAstTCO }
+
+constructor TAstTCO.Create;
+begin
+ inherited Create;
+ FIsTailStack := TStack.Create;
+ FNextIsTail := True; // The root expression is in tail position
+end;
+
+destructor TAstTCO.Destroy;
+begin
+ FIsTailStack.Free;
+ inherited;
+end;
+
+class function TAstTCO.Optimize(const RootNode: IAstNode): IAstNode;
+begin
+ var optimizer := TAstTCO.Create as IAstTCO;
+ Result := optimizer.Execute(RootNode);
+end;
+
+function TAstTCO.Execute(const RootNode: IAstNode): IAstNode;
+begin
+ var transformedValue := Accept(RootNode);
+ if transformedValue.IsVoid then
+ Result := TAst.Block([])
+ else
+ Result := transformedValue.AsIntf;
+end;
+
+function TAstTCO.Accept(const Node: IAstNode): TDataValue;
+begin
+ if (not Assigned(Node)) or Done then
+ exit;
+
+ FIsTailStack.Push(FNextIsTail);
+ try
+ Result := inherited Accept(Node);
+ finally
+ FNextIsTail := FIsTailStack.Pop;
+ end;
+end;
+
+function TAstTCO.VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue;
+var
+ i: Integer;
+ isContextTail: Boolean;
+begin
+ isContextTail := FIsTailStack.Peek;
+ for i := 0 to High(Node.Expressions) do
+ begin
+ // Only the last expression in a block is in tail position
+ FNextIsTail := isContextTail and (i = High(Node.Expressions));
+ Accept(Node.Expressions[i]);
+ end;
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
+var
+ isContextTail: Boolean;
+begin
+ isContextTail := FIsTailStack.Peek;
+
+ // Condition is never in tail position
+ FNextIsTail := False;
+ Accept(Node.Condition);
+
+ // Then/Else branches ARE in tail position if the IfExpr is
+ FNextIsTail := isContextTail;
+ Accept(Node.ThenBranch);
+ if Assigned(Node.ElseBranch) then
+ Accept(Node.ElseBranch);
+
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
+var
+ isContextTail: Boolean;
+begin
+ isContextTail := FIsTailStack.Peek;
+
+ // Condition is never in tail position
+ FNextIsTail := False;
+ Accept(Node.Condition);
+
+ // Then/Else branches ARE in tail position if the TernaryExpr is
+ FNextIsTail := isContextTail;
+ Accept(Node.ThenBranch);
+ Accept(Node.ElseBranch);
+
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
+begin
+ // Parameters are never in tail position
+ FNextIsTail := False;
+ AcceptNodes(Node.Parameters);
+
+ // The body of a lambda is *always* a tail position (relative to the lambda)
+ FNextIsTail := True;
+ Accept(Node.Body);
+
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitRecurNode(const Node: IRecurNode): TDataValue;
+begin
+ if not FIsTailStack.Peek then
+ raise Exception.Create('''recur'' can only be used in a tail position.');
+
+ // Arguments are not in tail position
+ FNextIsTail := False;
+ AcceptNodes(Node.Arguments);
+
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue;
+begin
+ // Propagate tail call status to the expanded body
+ FNextIsTail := FIsTailStack.Peek;
+ Accept(Node.ExpandedBody);
+
+ // Also visit the original call nodes, though they are not in tail pos
+ FNextIsTail := False;
+ Accept(Node.Callee);
+ AcceptNodes(Node.Arguments);
+
+ Result := TDataValue.FromIntf(Node);
+end;
+
+function TAstTCO.VisitFunctionCall(const Node: IFunctionCallNode): TDataValue;
+var
+ callee: IAstNode;
+ args: TArray;
+ isTailCall: Boolean;
+begin
+ isTailCall := FIsTailStack.Peek;
+
+ // Arguments are not in tail position
+ FNextIsTail := False;
+ callee := Accept(Node.Callee).AsIntf;
+ args := AcceptNodes(Node.Arguments);
+
+ // If TCO status changed, we MUST rebuild the node.
+ var boundNode := (Node as TBoundFunctionCallNode);
+ if (boundNode.IsTailCall <> isTailCall) or (callee <> Node.Callee) or (args <> Node.Arguments) then
+ begin
+ var newBoundCall := TBoundFunctionCallNode.Create(Node, callee, args, isTailCall);
+ (newBoundCall as TAstNode).StaticType := (Node as TAstNode).StaticType;
+ Result := TDataValue.FromIntf(newBoundCall);
+ end
+ else
+ Result := TDataValue.FromIntf(Node); // No change
+end;
+
+end.
diff --git a/Src/AST/Myc.Ast.Lowering.pas b/Src/AST/Myc.Ast.Lowering.pas
index 0fa7482..d4ec7a7 100644
--- a/Src/AST/Myc.Ast.Lowering.pas
+++ b/Src/AST/Myc.Ast.Lowering.pas
@@ -20,27 +20,17 @@ type
function Execute(const RootNode: IAstNode): IAstNode;
end;
- // This transformer runs *last* (after TypeChecker).
+ // This transformer runs *after* TypeChecker (Phase 3).
// It "lowers" the AST by rewriting complex nodes into simpler ones
// that the evaluator can understand (e.g., operator folding).
- // It also performs Tail Call Optimization (TCO) identification.
TAstLowerer = class(TAstTransformer, IAstLowerer)
private
FBinaryOperators: TDictionary;
FUnaryOperators: TDictionary;
- FIsTailStack: TStack;
- FNextIsTail: Boolean;
function SetType(const Node: IAstNode; const AType: IStaticType): IAstNode;
protected
- function Accept(const Node: IAstNode): TDataValue; override;
- function VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue; override;
+ // Override to find nodes to lower
function VisitFunctionCall(const Node: IFunctionCallNode): TDataValue; override;
- function VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue; override;
- function VisitIfExpression(const Node: IIfExpressionNode): TDataValue; override;
- function VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue; override;
- function VisitRecurNode(const Node: IRecurNode): TDataValue; override;
- function VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue; override;
-
public
constructor Create;
destructor Destroy; override;
@@ -63,10 +53,6 @@ var
begin
inherited Create;
- // TCO state
- FIsTailStack := TStack.Create;
- FNextIsTail := True; // The root expression is in tail position
-
// Operator folding maps
FBinaryOperators := TDictionary.Create;
for op := Low(TScalar.TBinaryOp) to High(TScalar.TBinaryOp) do
@@ -74,11 +60,11 @@ begin
FUnaryOperators := TDictionary.Create;
FUnaryOperators.Add('not', TScalar.TUnaryOp.Not);
+ // Note: '-' is handled as a special case in VisitFunctionCall
end;
destructor TAstLowerer.Destroy;
begin
- FIsTailStack.Free;
FUnaryOperators.Free;
FBinaryOperators.Free;
inherited;
@@ -97,7 +83,9 @@ begin
Result := TAst.Block([])
else
Result := transformedValue.AsIntf;
- (Result as TAstNode).StaticType := (Result as TAstNode).StaticType;
+
+ if Assigned(Result) then
+ (Result as TAstNode).StaticType := (Result as TAstNode).StaticType;
end;
function TAstLowerer.SetType(const Node: IAstNode; const AType: IStaticType): IAstNode;
@@ -106,126 +94,18 @@ begin
Result := Node;
end;
-function TAstLowerer.Accept(const Node: IAstNode): TDataValue;
-begin
- // Added for TCO
- if (not Assigned(Node)) or Done then
- exit;
-
- FIsTailStack.Push(FNextIsTail);
- try
- Result := inherited Accept(Node);
- finally
- FNextIsTail := FIsTailStack.Pop;
- end;
-end;
-
-function TAstLowerer.VisitMacroExpansionNode(const Node: IMacroExpansionNode): TDataValue;
-begin
- // This node is just a wrapper. We must propagate the TCO context
- // to the expanded body.
- // We don't need to rebuild the node, as the evaluator just executes the body.
- Accept(Node.Callee);
- AcceptNodes(Node.Arguments);
-
- // Propagate tail call status to the expanded body
- FNextIsTail := FIsTailStack.Peek;
- Result := Accept(Node.ExpandedBody);
-end;
-
-function TAstLowerer.VisitBlockExpression(const Node: IBlockExpressionNode): TDataValue;
-var
- i: Integer;
- isContextTail: Boolean;
-begin
- isContextTail := FIsTailStack.Peek;
- for i := 0 to High(Node.Expressions) do
- begin
- // Only the last expression in a block is in tail position
- FNextIsTail := isContextTail and (i = High(Node.Expressions));
- Accept(Node.Expressions[i]);
- end;
- Result := TDataValue.FromIntf(Node);
-end;
-
-function TAstLowerer.VisitIfExpression(const Node: IIfExpressionNode): TDataValue;
-var
- isContextTail: Boolean;
-begin
- isContextTail := FIsTailStack.Peek;
-
- // Condition is never in tail position
- FNextIsTail := False;
- Accept(Node.Condition);
-
- // Then/Else branches ARE in tail position if the IfExpr is
- FNextIsTail := isContextTail;
- Accept(Node.ThenBranch);
- if Assigned(Node.ElseBranch) then
- Accept(Node.ElseBranch);
-
- Result := TDataValue.FromIntf(Node);
-end;
-
-function TAstLowerer.VisitTernaryExpression(const Node: ITernaryExpressionNode): TDataValue;
-var
- isContextTail: Boolean;
-begin
- isContextTail := FIsTailStack.Peek;
-
- // Condition is never in tail position
- FNextIsTail := False;
- Accept(Node.Condition);
-
- // Then/Else branches ARE in tail position if the TernaryExpr is
- FNextIsTail := isContextTail;
- Accept(Node.ThenBranch);
- Accept(Node.ElseBranch);
-
- Result := TDataValue.FromIntf(Node);
-end;
-
-function TAstLowerer.VisitRecurNode(const Node: IRecurNode): TDataValue;
-begin
- if not FIsTailStack.Peek then
- raise Exception.Create('''recur'' can only be used in a tail position.');
-
- // Arguments are not in tail position
- FNextIsTail := False;
- AcceptNodes(Node.Arguments);
-
- Result := TDataValue.FromIntf(Node);
-end;
-
-function TAstLowerer.VisitLambdaExpression(const Node: ILambdaExpressionNode): TDataValue;
-begin
- // Parameters are never in tail position
- FNextIsTail := False;
- AcceptNodes(Node.Parameters);
-
- // The body of a lambda is *always* a tail position (relative to the lambda)
- FNextIsTail := True;
- Accept(Node.Body);
-
- // We don't modify the node, just traverse for TCO
- Result := TDataValue.FromIntf(Node);
-end;
-
function TAstLowerer.VisitFunctionCall(const Node: IFunctionCallNode): TDataValue;
var
calleeIdentifier: TIdentifierNode;
binaryOp: TScalar.TBinaryOp;
unaryOp: TScalar.TUnaryOp;
left, right: IAstNode;
- callee: IAstNode;
- args: TArray;
- isTailCall: Boolean;
begin
// --- Transformation: Keyword-as-Function ---
+ // (This logic is correctly handled in TAstBinder)
if (Node.Callee is TKeywordNode) then
begin
// This node should have been transformed by the TAstBinder.
- // If we see it here, it's an error, but we just traverse it.
exit(inherited VisitFunctionCall(Node));
end;
@@ -238,7 +118,6 @@ begin
begin
if FBinaryOperators.TryGetValue(calleeIdentifier.Name, binaryOp) then
begin
- FNextIsTail := False; // Ops are not tail calls
left := Accept(Node.Arguments[0]).AsIntf;
right := Accept(Node.Arguments[1]).AsIntf;
var binExpr := TAst.BinaryExpr(left, binaryOp, right);
@@ -251,7 +130,6 @@ begin
begin
if FUnaryOperators.TryGetValue(calleeIdentifier.Name, unaryOp) then
begin
- FNextIsTail := False; // Ops are not tail calls
right := Accept(Node.Arguments[0]).AsIntf;
var unExpr := TAst.UnaryExpr(unaryOp, right);
Result := TDataValue.FromIntf(SetType(unExpr, (Node as TAstNode).StaticType));
@@ -260,7 +138,6 @@ begin
if (calleeIdentifier.Name = '-') then
begin
- FNextIsTail := False; // Ops are not tail calls
right := Accept(Node.Arguments[0]).AsIntf;
var unExpr := TAst.UnaryExpr(TScalar.TUnaryOp.Negate, right);
Result := TDataValue.FromIntf(SetType(unExpr, (Node as TAstNode).StaticType));
@@ -269,23 +146,8 @@ begin
end;
end;
- // --- Standard Function Call (TCO Check) ---
- isTailCall := FIsTailStack.Peek;
-
- // Arguments are not in tail position
- FNextIsTail := False;
- callee := Accept(Node.Callee).AsIntf;
- args := AcceptNodes(Node.Arguments);
-
- // If TCO status changed, we MUST rebuild the node.
- var boundNode := (Node as TBoundFunctionCallNode);
- if (boundNode.IsTailCall <> isTailCall) or (callee <> Node.Callee) or (args <> Node.Arguments) then
- begin
- var newBoundCall := TBoundFunctionCallNode.Create(Node, callee, args, isTailCall);
- Result := TDataValue.FromIntf(SetType(newBoundCall, (Node as TAstNode).StaticType));
- end
- else
- Result := TDataValue.FromIntf(Node); // No change
+ // If no rewrite matched, continue traversal
+ Result := inherited VisitFunctionCall(Node);
end;
end.