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defer and struct hooks

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nub31
2025-09-19 23:08:12 +02:00
parent 609e1b5d85
commit ca838e32b8
15 changed files with 240 additions and 97 deletions
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162
compiler/NubLang/Generation/QBE/QBEGenerator.cs
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@@ -16,11 +16,14 @@ public class QBEGenerator
private readonly List<StringLiteral> _stringLiterals = [];
private readonly Stack<string> _breakLabels = [];
private readonly Stack<string> _continueLabels = [];
private readonly Stack<Scope> _scopes = new();
private int _tmpIndex;
private int _labelIndex;
private int _cStringLiteralIndex;
private int _stringLiteralIndex;
private Scope Scope => _scopes.Peek();
public QBEGenerator(List<DefinitionNode> definitions, HashSet<StructTypeNode> structTypes)
{
_definitions = definitions;
@@ -34,6 +37,7 @@ public class QBEGenerator
_stringLiterals.Clear();
_breakLabels.Clear();
_continueLabels.Clear();
_scopes.Clear();
_tmpIndex = 0;
_labelIndex = 0;
_cStringLiteralIndex = 0;
@@ -307,6 +311,16 @@ public class QBEGenerator
{
var value = EmitExpression(source);
_writer.Indented($"blit {value}, {destination}, {SizeOf(source.Type)}");
if (source.Type is StructTypeNode structType)
{
var copyFunc = structType.Functions.FirstOrDefault(x => x.Hook == "oncopy");
if (copyFunc != null)
{
_writer.Indented($"call {StructFuncName(structType.Module, structType.Name, copyFunc.Name)}(l {destination})");
}
}
return;
}
@@ -349,48 +363,6 @@ public class QBEGenerator
}
}
private string EmitCopy(ExpressionNode source)
{
if (source is RValueExpressionNode || source.Type.IsScalar)
{
return EmitExpression(source);
}
var value = EmitExpression(source);
var destination = TmpName();
if (source.Type.IsValueType)
{
var size = SizeOf(source.Type);
_writer.Indented($"{destination} =l alloc8 {size}");
_writer.Indented($"blit {value}, {destination}, {size}");
return destination;
}
switch (source.Type)
{
case ArrayTypeNode arrayType:
var arraySize = EmitArraySizeInBytes(arrayType, value);
_writer.Indented($"{destination} =l alloc8 {arraySize}");
EmitMemcpy(value, destination, arraySize);
break;
case CStringTypeNode:
var cstrSize = EmitCStringSizeInBytes(value);
_writer.Indented($"{destination} =l alloc8 {cstrSize}");
EmitMemcpy(value, destination, cstrSize);
break;
case StringTypeNode:
var strSize = EmitStringSizeInBytes(value);
_writer.Indented($"{destination} =l alloc8 {strSize}");
EmitMemcpy(value, destination, strSize);
break;
default:
throw new InvalidOperationException($"Cannot copy type {source.Type}");
}
return destination;
}
private void EmitStructType(StructTypeNode structType)
{
// todo(nub31): qbe expects structs to be declared in order. We must Check the dependencies of the struct to see if a type need to be declared before this one
@@ -450,7 +422,13 @@ public class QBEGenerator
_writer.WriteLine(") {");
_writer.WriteLine("@start");
EmitBlock(function.Body);
var scope = new Scope();
foreach (var parameter in function.Signature.Parameters)
{
scope.Variables.Push(new Variable(parameter.Name, parameter.Type));
}
EmitBlock(function.Body, scope);
// Implicit return for void functions if no explicit return has been set
if (function.Signature.ReturnType is VoidTypeNode && function.Body.Statements.LastOrDefault() is not ReturnNode)
@@ -488,18 +466,31 @@ public class QBEGenerator
_writer.WriteLine(") {");
_writer.WriteLine("@start");
EmitBlock(funcDef.Body);
var scope = new Scope();
foreach (var parameter in funcDef.Signature.Parameters)
{
scope.Variables.Push(new Variable(parameter.Name, parameter.Type));
}
EmitBlock(funcDef.Body, scope);
_writer.WriteLine("}");
_writer.NewLine();
}
private void EmitBlock(BlockNode block)
private void EmitBlock(BlockNode block, Scope? scope = null)
{
scope ??= Scope.SubScope();
_scopes.Push(scope);
foreach (var statement in block.Statements)
{
EmitStatement(statement);
}
EmitScopeCleanup();
_scopes.Pop();
}
private void EmitStatement(StatementNode statement)
@@ -510,9 +501,11 @@ public class QBEGenerator
EmitCopyInto(assignment.Value, EmitAddressOf(assignment.Target));
break;
case BreakNode:
EmitScopeCleanup();
_writer.Indented($"jmp {_breakLabels.Peek()}");
break;
case ContinueNode:
EmitScopeCleanup();
_writer.Indented($"jmp {_continueLabels.Peek()}");
break;
case IfNode ifStatement:
@@ -527,6 +520,9 @@ public class QBEGenerator
case VariableDeclarationNode variableDeclaration:
EmitVariableDeclaration(variableDeclaration);
break;
case DeferNode defer:
Scope.DeferredStatements.Push(defer.Statement);
break;
case WhileNode whileStatement:
EmitWhile(whileStatement);
break;
@@ -538,6 +534,26 @@ public class QBEGenerator
}
}
private void EmitScopeCleanup()
{
while (Scope.DeferredStatements.TryPop(out var deferredStatement))
{
EmitStatement(deferredStatement);
}
while (Scope.Variables.TryPop(out var variable))
{
if (variable.Type is StructTypeNode structType)
{
var destroyFunc = structType.Functions.FirstOrDefault(x => x.Hook == "ondestroy");
if (destroyFunc != null)
{
_writer.Indented($"call {StructFuncName(structType.Module, structType.Name, destroyFunc.Name)}(l %{variable.Name})");
}
}
}
}
private void EmitIf(IfNode ifStatement)
{
var trueLabel = LabelName();
@@ -552,7 +568,7 @@ public class QBEGenerator
_writer.WriteLine(falseLabel);
if (ifStatement.Else.HasValue)
{
ifStatement.Else.Value.Match(EmitIf, EmitBlock);
ifStatement.Else.Value.Match(EmitIf, b => EmitBlock(b));
}
_writer.WriteLine(endLabel);
@@ -563,10 +579,12 @@ public class QBEGenerator
if (@return.Value.HasValue)
{
var result = EmitExpression(@return.Value.Value);
EmitScopeCleanup();
_writer.Indented($"ret {result}");
}
else
{
EmitScopeCleanup();
_writer.Indented("ret");
}
}
@@ -580,6 +598,8 @@ public class QBEGenerator
{
EmitCopyInto(variableDeclaration.Assignment.Value, name);
}
Scope.Variables.Push(new Variable(variableDeclaration.Name, variableDeclaration.Type));
}
private void EmitWhile(WhileNode whileStatement)
@@ -677,7 +697,6 @@ public class QBEGenerator
BinaryExpressionNode expr => EmitBinaryExpression(expr),
ConvertFloatNode expr => EmitConvertFloat(expr),
ConvertIntNode expr => EmitConvertInt(expr),
DereferenceNode expr => EmitLoad(expr.Type, EmitExpression(expr.Expression)),
FuncCallNode expr => EmitFuncCall(expr),
FuncIdentifierNode expr => FuncName(expr.Module, expr.Name, expr.ExternSymbol),
FuncParameterIdentifierNode expr => $"%{expr.Name}",
@@ -740,6 +759,7 @@ public class QBEGenerator
return lval switch
{
ArrayIndexAccessNode arrayIndexAccess => EmitAddressOfArrayIndexAccess(arrayIndexAccess),
DereferenceNode dereference => EmitExpression(dereference.Expression),
StructFieldAccessNode structFieldAccess => EmitAddressOfStructFieldAccess(structFieldAccess),
VariableIdentifierNode variableIdent => $"%{variableIdent.Name}",
_ => throw new ArgumentOutOfRangeException(nameof(lval))
@@ -948,6 +968,12 @@ public class QBEGenerator
_writer.Indented($"{destination} =l alloc8 {size}");
_writer.Indented($"call {StructCtorName(structInitializer.StructType.Module, structInitializer.StructType.Name)}(l {destination})");
var createFunc = structInitializer.StructType.Functions.FirstOrDefault(x => x.Hook == "oncreate");
if (createFunc != null)
{
_writer.Indented($"call {StructFuncName(structInitializer.StructType.Module, structInitializer.StructType.Name, createFunc.Name)}(l {destination})");
}
foreach (var (field, value) in structInitializer.Initializers)
{
var offset = TmpName();
@@ -1015,8 +1041,18 @@ public class QBEGenerator
foreach (var parameter in structFuncCall.Parameters)
{
var copy = EmitCopy(parameter);
parameterStrings.Add($"{FuncQBETypeName(parameter.Type)} {copy}");
var value = EmitExpression(parameter);
if (parameter.Type is StructTypeNode structType)
{
var copyFunc = structType.Functions.FirstOrDefault(x => x.Hook == "oncopy");
if (copyFunc != null)
{
_writer.Indented($"call {StructFuncName(structType.Module, structType.Name, copyFunc.Name)}(l {value})");
}
}
parameterStrings.Add($"{FuncQBETypeName(parameter.Type)} {value}");
}
if (structFuncCall.Type is VoidTypeNode)
@@ -1093,8 +1129,18 @@ public class QBEGenerator
foreach (var parameter in funcCall.Parameters)
{
var copy = EmitCopy(parameter);
parameterStrings.Add($"{FuncQBETypeName(parameter.Type)} {copy}");
var value = EmitExpression(parameter);
if (parameter.Type is StructTypeNode structType)
{
var copyFunc = structType.Functions.FirstOrDefault(x => x.Hook == "oncopy");
if (copyFunc != null)
{
_writer.Indented($"call {StructFuncName(structType.Module, structType.Name, copyFunc.Name)}(l {value})");
}
}
parameterStrings.Add($"{FuncQBETypeName(parameter.Type)} {value}");
}
if (funcCall.Type is VoidTypeNode)
@@ -1242,6 +1288,20 @@ public class QBEGenerator
}
}
// todo(nub31): Parent is not used when getting variables and deferred statements
public class Scope(Scope? parent = null)
{
public readonly Stack<StatementNode> DeferredStatements = [];
public readonly Stack<Variable> Variables = [];
public Scope SubScope()
{
return new Scope(this);
}
}
public record Variable(string Name, TypeNode Type);
public class StringLiteral(string value, string name)
{
public string Value { get; } = value;