700 lines
25 KiB
C#
700 lines
25 KiB
C#
using System.Diagnostics;
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using System.Text;
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namespace Compiler;
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public class Generator
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{
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public static string Emit(List<TypedNodeDefinitionFunc> functions, ModuleGraph moduleGraph, string? entryPoint)
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{
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return new Generator(functions, moduleGraph, entryPoint).Emit();
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}
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private Generator(List<TypedNodeDefinitionFunc> functions, ModuleGraph moduleGraph, string? entryPoint)
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{
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this.functions = functions;
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this.moduleGraph = moduleGraph;
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this.entryPoint = entryPoint;
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}
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private readonly List<TypedNodeDefinitionFunc> functions;
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private readonly ModuleGraph moduleGraph;
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private readonly string? entryPoint;
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private IndentedTextWriter writer = new();
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private HashSet<NubType> referencedTypes = new();
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private readonly HashSet<NubType> emittedTypes = new();
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private readonly Stack<Scope> scopes = new();
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private int tmpNameIndex = 0;
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private string Emit()
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{
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if (entryPoint != null)
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{
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writer.WriteLine($$"""
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int main(int argc, char *argv[])
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{
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return {{entryPoint}}();
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}
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""");
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writer.WriteLine();
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}
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foreach (var function in functions)
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{
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if (!moduleGraph.TryResolveIdentifier(function.Module, function.Name.Ident, true, out var info))
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throw new UnreachableException($"Module graph does not have info about the function {function.Module}::{function.Name.Ident}. This should have been caught earlier");
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if (info.Source == Module.DefinitionSource.Imported || info.Extern)
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writer.Write("extern ");
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else if (info.Source == Module.DefinitionSource.Internal && !info.Extern && !info.Exported)
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writer.Write("static ");
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var parameters = function.Parameters.Select(x => CType(x.Type, x.Name.Ident));
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writer.WriteLine($"{CType(function.ReturnType, info.MangledName)}({string.Join(", ", parameters)})");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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EmitStatement(function.Body);
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PopScope();
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}
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writer.WriteLine("}");
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writer.WriteLine();
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}
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var implementations = writer.ToString();
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writer = new IndentedTextWriter();
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foreach (var module in moduleGraph.GetModules())
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{
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foreach (var (name, info) in module.GetIdentifiers())
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{
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if (info.Source == Module.DefinitionSource.Internal || info.Exported)
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{
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if (info.Source == Module.DefinitionSource.Imported || info.Extern)
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writer.Write("extern ");
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else if (info.Source == Module.DefinitionSource.Internal && !info.Extern && !info.Exported)
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writer.Write("static ");
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if (info.Type is NubTypeFunc fn)
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writer.WriteLine($"{CType(fn.ReturnType, info.MangledName)}({string.Join(", ", fn.Parameters.Select(p => CType(p)))});");
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else
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writer.WriteLine($"{CType(info.Type, info.MangledName)};");
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}
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}
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}
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var declarations = writer.ToString();
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writer = new IndentedTextWriter();
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writer.WriteLine("""
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#include <float.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#define FLAG_STRING_LITERAL 1
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""");
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while (referencedTypes.Count != 0)
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{
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var type = referencedTypes.ElementAt(0);
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EmitTypeDefinitionIfNotEmitted(type);
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referencedTypes.Remove(type);
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}
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var header = writer.ToString();
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return $"{header}\n{declarations}\n{implementations}";
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}
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private void EmitTypeDefinitionIfNotEmitted(NubType type)
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{
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if (emittedTypes.Contains(type))
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return;
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emittedTypes.Add(type);
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switch (type)
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{
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case NubTypeString stringType:
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{
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writer.WriteLine($"struct {NameMangler.Mangle("core", "string", stringType)}");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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writer.WriteLine("char *data;");
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writer.WriteLine("size_t length;");
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writer.WriteLine("uint32_t ref;");
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writer.WriteLine("uint32_t flags;");
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}
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writer.WriteLine("};");
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writer.WriteLine();
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break;
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}
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case NubTypeStruct structType:
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{
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if (!moduleGraph.TryResolveType(structType.Module, structType.Name, true, out var info) || info is not Module.TypeInfoStruct structInfo)
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throw new UnreachableException();
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foreach (var field in structInfo.Fields)
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EmitTypeDefinitionIfNotEmitted(field.Type);
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writer.Write("struct ");
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if (structInfo.Packed)
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writer.Write("__attribute__((__packed__)) ");
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writer.WriteLine(NameMangler.Mangle(structType.Module, structType.Name, structType));
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writer.WriteLine("{");
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using (writer.Indent())
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{
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foreach (var field in structInfo.Fields)
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{
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writer.WriteLine($"{CType(field.Type, field.Name)};");
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}
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}
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writer.WriteLine("};");
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writer.WriteLine();
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break;
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}
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case NubTypeAnonymousStruct anonymousStructType:
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{
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foreach (var field in anonymousStructType.Fields)
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EmitTypeDefinitionIfNotEmitted(field.Type);
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writer.WriteLine($"struct {NameMangler.Mangle("anonymous", "struct", anonymousStructType)}");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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foreach (var field in anonymousStructType.Fields)
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{
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writer.WriteLine($"{CType(field.Type, field.Name)};");
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}
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}
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writer.WriteLine("};");
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writer.WriteLine();
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break;
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}
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case NubTypeEnum enumType:
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{
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if (!moduleGraph.TryResolveType(enumType.Module, enumType.Name, true, out var info) || info is not Module.TypeInfoEnum enumInfo)
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throw new UnreachableException();
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foreach (var variant in enumInfo.Variants)
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EmitTypeDefinitionIfNotEmitted(variant.Type);
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writer.WriteLine($"struct {NameMangler.Mangle(enumType.Module, enumType.Name, enumType)}");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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writer.WriteLine("uint32_t tag;");
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writer.WriteLine("union");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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foreach (var variant in enumInfo.Variants)
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{
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writer.WriteLine($"{CType(variant.Type, variant.Name)};");
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}
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}
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writer.WriteLine("};");
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}
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writer.WriteLine("};");
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writer.WriteLine();
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break;
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}
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case NubTypeEnumVariant variantType:
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{
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EmitTypeDefinitionIfNotEmitted(variantType.EnumType);
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break;
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}
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}
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}
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private void EmitStatement(TypedNodeStatement node)
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{
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if (scopes.Peek().Unreachable)
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return;
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switch (node)
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{
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case TypedNodeStatementBlock statement:
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EmitStatementBlock(statement);
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break;
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case TypedNodeStatementFuncCall statement:
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EmitStatementFuncCall(statement);
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break;
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case TypedNodeStatementReturn statement:
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EmitStatementReturn(statement);
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break;
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case TypedNodeStatementVariableDeclaration statement:
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EmitStatementVariableDeclaration(statement);
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break;
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case TypedNodeStatementAssignment statement:
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EmitStatementAssignment(statement);
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break;
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case TypedNodeStatementIf statement:
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EmitStatementIf(statement);
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break;
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case TypedNodeStatementWhile statement:
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EmitStatementWhile(statement);
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break;
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case TypedNodeStatementMatch statement:
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EmitStatementMatch(statement);
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break;
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default:
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throw new ArgumentOutOfRangeException(nameof(node), node, null);
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}
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}
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private void EmitStatementBlock(TypedNodeStatementBlock node)
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{
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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foreach (var statement in node.Statements)
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EmitStatement(statement);
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PopScope();
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}
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writer.WriteLine("}");
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}
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private void EmitStatementFuncCall(TypedNodeStatementFuncCall node)
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{
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var name = EmitExpression(node.Target);
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var parameterValues = node.Parameters.Select(EmitExpression).ToList();
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writer.WriteLine($"{name}({string.Join(", ", parameterValues)});");
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}
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private void EmitStatementReturn(TypedNodeStatementReturn statement)
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{
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if (statement.Value != null)
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{
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var value = EmitExpression(statement.Value);
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var variableName = TmpName();
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writer.WriteLine($"{CType(statement.Value.Type, variableName)} = {value};");
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EmitCleanupAllScopes();
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writer.WriteLine($"return {variableName};");
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}
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else
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{
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EmitCleanupAllScopes();
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writer.WriteLine($"return;");
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}
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scopes.Peek().Unreachable = true;
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}
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private void EmitStatementVariableDeclaration(TypedNodeStatementVariableDeclaration statement)
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{
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var value = EmitExpression(statement.Value);
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EmitCopyConstructor(value, statement.Value.Type);
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writer.WriteLine($"{CType(statement.Type, statement.Name.Ident)} = {value};");
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scopes.Peek().Locals.Add((statement.Name.Ident, statement.Type));
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}
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private void EmitStatementAssignment(TypedNodeStatementAssignment statement)
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{
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var target = EmitExpression(statement.Target);
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EmitCopyDestructor(target, statement.Target.Type);
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var value = EmitExpression(statement.Value);
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EmitCopyConstructor(value, statement.Value.Type);
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writer.WriteLine($"{target} = {value};");
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}
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private void EmitStatementIf(TypedNodeStatementIf statement)
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{
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var condition = EmitExpression(statement.Condition);
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writer.WriteLine($"if ({condition})");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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EmitStatement(statement.ThenBlock);
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PopScope();
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}
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writer.WriteLine("}");
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if (statement.ElseBlock != null)
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{
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writer.Write("else");
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if (statement.ElseBlock is TypedNodeStatementIf)
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writer.Write(" ");
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else
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writer.WriteLine();
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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EmitStatement(statement.ElseBlock);
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PopScope();
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}
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writer.WriteLine("}");
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}
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}
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private void EmitStatementWhile(TypedNodeStatementWhile statement)
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{
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var condition = EmitExpression(statement.Condition);
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writer.WriteLine($"while ({condition})");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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EmitStatement(statement.Body);
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PopScope();
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}
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writer.WriteLine("}");
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}
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private void EmitStatementMatch(TypedNodeStatementMatch statement)
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{
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var target = EmitExpression(statement.Target);
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var enumType = (NubTypeEnum)statement.Target.Type;
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if (!moduleGraph.TryResolveType(enumType.Module, enumType.Name, true, out var info))
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throw new UnreachableException();
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var enumInfo = (Module.TypeInfoEnum)info;
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writer.WriteLine($"switch ({target}.tag)");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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foreach (var @case in statement.Cases)
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{
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var variantInfo = enumInfo.Variants.First(x => x.Name == @case.Variant.Ident);
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var tag = enumInfo.Variants.ToList().FindIndex(x => x.Name == @case.Variant.Ident);
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writer.WriteLine($"case {tag}:");
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writer.WriteLine("{");
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using (writer.Indent())
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{
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PushScope();
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writer.WriteLine($"{CType(variantInfo.Type, @case.VariableName.Ident)} = {target}.{@case.Variant.Ident};");
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EmitStatement(@case.Body);
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PopScope();
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writer.WriteLine("break;");
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}
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writer.WriteLine("}");
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}
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}
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writer.WriteLine("}");
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}
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private string EmitExpression(TypedNodeExpression node)
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{
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return node switch
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{
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TypedNodeExpressionBinary expression => EmitExpressionBinary(expression),
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TypedNodeExpressionUnary expression => EmitExpressionUnary(expression),
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TypedNodeExpressionBoolLiteral expression => expression.Value.Value ? "true" : "false",
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TypedNodeExpressionIntLiteral expression => expression.Value.Value.ToString(),
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TypedNodeExpressionStringLiteral expression => EmitExpressionStringLiteral(expression),
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TypedNodeExpressionStructLiteral expression => EmitExpressionStructLiteral(expression),
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TypedNodeExpressionEnumLiteral expression => EmitExpressionEnumLiteral(expression),
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TypedNodeExpressionStructMemberAccess expression => EmitExpressionMemberAccess(expression),
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TypedNodeExpressionStringLength expression => EmitExpressionStringLength(expression),
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TypedNodeExpressionStringPointer expression => EmitExpressionStringPointer(expression),
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TypedNodeExpressionLocalIdent expression => expression.Name,
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TypedNodeExpressionGlobalIdent expression => EmitNodeExpressionGlobalIdent(expression),
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TypedNodeExpressionFuncCall expression => EmitExpressionFuncCall(expression),
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_ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
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};
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}
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private string EmitExpressionBinary(TypedNodeExpressionBinary expression)
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{
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var left = EmitExpression(expression.Left);
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var right = EmitExpression(expression.Right);
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return expression.Operation switch
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{
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TypedNodeExpressionBinary.Op.Add => $"({left} + {right})",
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TypedNodeExpressionBinary.Op.Subtract => $"({left} - {right})",
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TypedNodeExpressionBinary.Op.Multiply => $"({left} * {right})",
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TypedNodeExpressionBinary.Op.Divide => $"({left} / {right})",
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TypedNodeExpressionBinary.Op.Modulo => $"({left} % {right})",
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TypedNodeExpressionBinary.Op.Equal => $"({left} == {right})",
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TypedNodeExpressionBinary.Op.NotEqual => $"({left} != {right})",
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TypedNodeExpressionBinary.Op.LessThan => $"({left} < {right})",
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TypedNodeExpressionBinary.Op.LessThanOrEqual => $"({left} <= {right})",
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TypedNodeExpressionBinary.Op.GreaterThan => $"({left} > {right})",
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TypedNodeExpressionBinary.Op.GreaterThanOrEqual => $"({left} >= {right})",
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TypedNodeExpressionBinary.Op.LeftShift => $"({left} << {right})",
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TypedNodeExpressionBinary.Op.RightShift => $"({left} >> {right})",
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TypedNodeExpressionBinary.Op.LogicalAnd => $"({left} && {right})",
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TypedNodeExpressionBinary.Op.LogicalOr => $"({left} || {right})",
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_ => throw new ArgumentOutOfRangeException()
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};
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}
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private string EmitExpressionUnary(TypedNodeExpressionUnary expression)
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{
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var target = EmitExpression(expression.Target);
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return expression.Operation switch
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{
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TypedNodeExpressionUnary.Op.Negate => $"(-{target})",
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TypedNodeExpressionUnary.Op.Invert => $"(!{target})",
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_ => throw new ArgumentOutOfRangeException()
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};
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}
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private string EmitExpressionStringLiteral(TypedNodeExpressionStringLiteral expression)
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{
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var name = TmpName();
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scopes.Peek().Locals.Add((name, expression.Type));
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var variable = CType(expression.Type, name);
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writer.WriteLine($"{variable} = malloc(sizeof(struct {NameMangler.Mangle("core", "string", expression.Type)}));");
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writer.WriteLine($"{name}->data = \"{expression.Value.Value}\";");
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writer.WriteLine($"{name}->length = {expression.Value.Value.Length};");
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writer.WriteLine($"{name}->ref = 1;");
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writer.WriteLine($"{name}->flags = FLAG_STRING_LITERAL;");
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return name;
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}
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private string EmitExpressionStructLiteral(TypedNodeExpressionStructLiteral expression)
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{
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var initializerValues = new Dictionary<string, string>();
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foreach (var initializer in expression.Initializers)
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{
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var values = EmitExpression(initializer.Value);
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initializerValues[initializer.Name.Ident] = values;
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}
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var initializerStrings = initializerValues.Select(x => $".{x.Key} = {x.Value}");
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return $"({CType(expression.Type)}){{ {string.Join(", ", initializerStrings)} }}";
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}
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private string EmitExpressionEnumLiteral(TypedNodeExpressionEnumLiteral expression)
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{
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var enumVariantType = (NubTypeEnumVariant)expression.Type;
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if (!moduleGraph.TryResolveType(enumVariantType.EnumType.Module, enumVariantType.EnumType.Name, true, out var info))
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throw new UnreachableException();
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var enumInfo = (Module.TypeInfoEnum)info;
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var tag = enumInfo.Variants.ToList().FindIndex(x => x.Name == enumVariantType.Variant);
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var value = EmitExpression(expression.Value);
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return $"({CType(expression.Type)}){{ .tag = {tag}, .{enumVariantType.Variant} = {value} }}";
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}
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private string EmitExpressionMemberAccess(TypedNodeExpressionStructMemberAccess expression)
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{
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var target = EmitExpression(expression.Target);
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return $"{target}.{expression.Name.Ident}";
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}
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private string EmitExpressionStringLength(TypedNodeExpressionStringLength expression)
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{
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var target = EmitExpression(expression.Target);
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return $"{target}->length";
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}
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private string EmitExpressionStringPointer(TypedNodeExpressionStringPointer expression)
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{
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var target = EmitExpression(expression.Target);
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return $"{target}->data";
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}
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private string EmitNodeExpressionGlobalIdent(TypedNodeExpressionGlobalIdent expression)
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{
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if (!moduleGraph.TryResolveIdentifier(expression.Module, expression.Name, true, out var info))
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throw new UnreachableException($"Module graph does not have info about identifier {expression.Module}::{expression.Name}. This should have been caught earlier");
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return info.MangledName;
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}
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private string EmitExpressionFuncCall(TypedNodeExpressionFuncCall expression)
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{
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var name = EmitExpression(expression.Target);
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var parameterValues = expression.Parameters.Select(EmitExpression).ToList();
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return $"{name}({string.Join(", ", parameterValues)})";
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}
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public string CType(NubType node, string? varName = null)
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|
{
|
|
referencedTypes.Add(node);
|
|
|
|
return node switch
|
|
{
|
|
NubTypeVoid => "void" + (varName != null ? $" {varName}" : ""),
|
|
NubTypeBool => "bool" + (varName != null ? $" {varName}" : ""),
|
|
NubTypeStruct type => $"struct {NameMangler.Mangle(type.Module, type.Name, type)}" + (varName != null ? $" {varName}" : ""),
|
|
NubTypeAnonymousStruct type => CTypeAnonymousStruct(type, varName),
|
|
NubTypeEnum type => $"struct {NameMangler.Mangle(type.Module, type.Name, type)}" + (varName != null ? $" {varName}" : ""),
|
|
NubTypeEnumVariant type => CType(type.EnumType, varName),
|
|
NubTypeSInt type => $"int{type.Width}_t" + (varName != null ? $" {varName}" : ""),
|
|
NubTypeUInt type => $"uint{type.Width}_t" + (varName != null ? $" {varName}" : ""),
|
|
NubTypePointer type => CType(type.To) + (varName != null ? $" *{varName}" : "*"),
|
|
NubTypeString type => $"struct {NameMangler.Mangle("core", "string", type)}" + (varName != null ? $" *{varName}" : "*"),
|
|
NubTypeFunc type => $"{CType(type.ReturnType)} (*{varName})({string.Join(", ", type.Parameters.Select(p => CType(p)))})",
|
|
_ => throw new ArgumentOutOfRangeException(nameof(node), node, null)
|
|
};
|
|
}
|
|
|
|
private static string CTypeAnonymousStruct(NubTypeAnonymousStruct type, string? varName)
|
|
{
|
|
return $"struct {NameMangler.Mangle("anonymous", "struct", type)}{(varName != null ? $" {varName}" : "")}";
|
|
}
|
|
|
|
private string TmpName()
|
|
{
|
|
return $"_tmp{tmpNameIndex++}";
|
|
}
|
|
|
|
private void EmitCleanupAllScopes()
|
|
{
|
|
foreach (var scope in scopes.Reverse())
|
|
{
|
|
for (int i = scope.Locals.Count - 1; i >= 0; i--)
|
|
{
|
|
var (name, type) = scope.Locals[i];
|
|
EmitCopyDestructor(name, type);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void EmitCleanupCurrentScope(Scope scope)
|
|
{
|
|
for (int i = scope.Locals.Count - 1; i >= 0; i--)
|
|
{
|
|
var (name, type) = scope.Locals[i];
|
|
EmitCopyDestructor(name, type);
|
|
}
|
|
}
|
|
|
|
private void EmitCopyConstructor(string value, NubType type)
|
|
{
|
|
switch (type)
|
|
{
|
|
case NubTypeString:
|
|
writer.WriteLine($"{value}->ref += 1;");
|
|
break;
|
|
}
|
|
}
|
|
|
|
private void EmitCopyDestructor(string value, NubType type)
|
|
{
|
|
switch (type)
|
|
{
|
|
case NubTypeString:
|
|
writer.WriteLine($"{value}->ref -= 1;");
|
|
writer.WriteLine($"if ({value}->ref == 0)");
|
|
writer.WriteLine("{");
|
|
using (writer.Indent())
|
|
{
|
|
writer.WriteLine($"if (({value}->flags & FLAG_STRING_LITERAL) == 0)");
|
|
writer.WriteLine("{");
|
|
using (writer.Indent())
|
|
{
|
|
writer.WriteLine($"free({value}->data);");
|
|
}
|
|
writer.WriteLine("}");
|
|
writer.WriteLine($"free({value});");
|
|
}
|
|
writer.WriteLine("}");
|
|
break;
|
|
}
|
|
}
|
|
|
|
private void PushScope()
|
|
{
|
|
scopes.Push(new Scope());
|
|
}
|
|
|
|
private void PopScope()
|
|
{
|
|
var scope = scopes.Pop();
|
|
if (!scope.Unreachable)
|
|
EmitCleanupCurrentScope(scope);
|
|
}
|
|
|
|
private class Scope
|
|
{
|
|
public List<(string Name, NubType Type)> Locals { get; } = [];
|
|
public bool Unreachable { get; set; }
|
|
}
|
|
}
|
|
|
|
internal class IndentedTextWriter
|
|
{
|
|
private readonly StringBuilder builder = new();
|
|
private int indentLevel;
|
|
|
|
public IDisposable Indent()
|
|
{
|
|
indentLevel++;
|
|
return new IndentScope(this);
|
|
}
|
|
|
|
public void WriteLine(string text)
|
|
{
|
|
WriteIndent();
|
|
builder.AppendLine(text);
|
|
}
|
|
|
|
public void Write(string text)
|
|
{
|
|
WriteIndent();
|
|
builder.Append(text);
|
|
}
|
|
|
|
public void WriteLine()
|
|
{
|
|
builder.AppendLine();
|
|
}
|
|
|
|
public override string ToString()
|
|
{
|
|
return builder.ToString();
|
|
}
|
|
|
|
private void WriteIndent()
|
|
{
|
|
if (builder.Length > 0)
|
|
{
|
|
var lastChar = builder[^1];
|
|
if (lastChar != '\n' && lastChar != '\r')
|
|
return;
|
|
}
|
|
|
|
for (var i = 0; i < indentLevel; i++)
|
|
{
|
|
builder.Append(" ");
|
|
}
|
|
}
|
|
|
|
private class IndentScope(IndentedTextWriter writer) : IDisposable
|
|
{
|
|
private bool disposed;
|
|
|
|
public void Dispose()
|
|
{
|
|
if (disposed) return;
|
|
writer.indentLevel--;
|
|
disposed = true;
|
|
}
|
|
}
|
|
} |