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IF ELSE ENDIF

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Martin
2025-10-11 23:51:14 +02:00
parent 0e549b6e0a
commit 384f9c7197
11 changed files with 173 additions and 72 deletions
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224
Program.cs
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@ -21,47 +21,77 @@ class Program {
} }
} }
// === AST & TYPES === // === AST ===
public enum VarType { Int8=1, Int16=2, Int32=3, Byte=4, Bool=5 } public enum VarType { Int8=1, Int16=2, Int32=3, Byte=4, Bool=5 }
public abstract class StNode{}
public class ProgramNode:StNode{ public List<VarDecl> Vars=new(); public List<Stmt> Stmts=new(); }
public class VarDecl:StNode{ public string Name; public VarType Type; public Expr? Init; }
public abstract class Stmt:StNode{}
public class AssignStmt:Stmt{ public string Target; public Expr Expr; }
public abstract class Expr:StNode{}
public class IntExpr:Expr{ public int Value; public IntExpr(int v){Value=v;} }
public class VarExpr:Expr{ public string Name; public VarExpr(string n){Name=n;} }
public class BinaryExpr:Expr{ public Expr L; public Expr R; public TokType Op; public BinaryExpr(Expr l,TokType op,Expr r){L=l;Op=op;R=r;} }
// === LEXER === public abstract class StNode {}
public enum TokType { IDENT, INT, ASSIGN, SEMI, LPAREN, RPAREN, PLUS, MINUS, MUL, DIV, PROGRAM, VAR, END_VAR, END_PROGRAM, EOF } public class ProgramNode : StNode { public List<VarDecl> Vars=new(); public List<Stmt> Stmts=new(); }
public class VarDecl : StNode { public string Name; public VarType Type; public Expr? Init; }
public abstract class Stmt : StNode {}
public class AssignStmt : Stmt { public string Target; public Expr Expr; }
public class IfStmt : Stmt { public Expr Cond; public List<Stmt> ThenStmts=new(); public List<Stmt> ElseStmts=new(); }
public abstract class Expr : StNode {}
public class IntExpr : Expr { public int Value; public IntExpr(int v){Value=v;} }
public class VarExpr : Expr { public string Name; public VarExpr(string n){Name=n;} }
public class BinaryExpr : Expr { public Expr L; public Expr R; public TokType Op; public BinaryExpr(Expr l, TokType op, Expr r){L=l;Op=op;R=r;} }
// === TOKENIZER ===
public enum TokType {
IDENT, INT, ASSIGN, SEMI, LPAREN, RPAREN,
PLUS, MINUS, MUL, DIV,
LT, GT, LE, GE, EQ, NEQ,
IF, THEN, ELSE, END_IF,
PROGRAM, VAR, END_VAR, END_PROGRAM,
EOF
}
public class Token { public TokType Type; public string Text; public Token(TokType t,string s){Type=t;Text=s;} } public class Token { public TokType Type; public string Text; public Token(TokType t,string s){Type=t;Text=s;} }
public class StLexer { public class StLexer {
private readonly string src; private int i; private readonly string src; private int i;
public StLexer(string s){src=s;} public StLexer(string s){src=s;}
char Peek()=> i<src.Length?src[i]:'\0'; char Peek()=> i<src.Length?src[i]:'\0';
char Next()=> i<src.Length?src[i++]:'\0'; char Next()=> i<src.Length?src[i++]:'\0';
public Token NextToken(){
while(char.IsWhiteSpace(Peek())) Next(); public Token NextToken() {
while (char.IsWhiteSpace(Peek())) Next();
if (Peek()=='\0') return new Token(TokType.EOF,""); if (Peek()=='\0') return new Token(TokType.EOF,"");
if (char.IsLetter(Peek())||Peek()=='_'){
if (char.IsLetter(Peek())||Peek()=='_') {
var sb=new StringBuilder(); var sb=new StringBuilder();
while(char.IsLetterOrDigit(Peek())||Peek()=='_') sb.Append(Next()); while (char.IsLetterOrDigit(Peek())||Peek()=='_') sb.Append(Next());
var s=sb.ToString(); var s=sb.ToString();
switch(s.ToUpperInvariant()){ switch(s.ToUpperInvariant()) {
case "PROGRAM":return new Token(TokType.PROGRAM,s); case "PROGRAM": return new Token(TokType.PROGRAM,s);
case "VAR":return new Token(TokType.VAR,s); case "VAR": return new Token(TokType.VAR,s);
case "END_VAR":return new Token(TokType.END_VAR,s); case "END_VAR": return new Token(TokType.END_VAR,s);
case "END_PROGRAM":return new Token(TokType.END_PROGRAM,s); case "END_PROGRAM": return new Token(TokType.END_PROGRAM,s);
default:return new Token(TokType.IDENT,s); case "IF": return new Token(TokType.IF,s);
case "THEN": return new Token(TokType.THEN,s);
case "ELSE": return new Token(TokType.ELSE,s);
case "END_IF": return new Token(TokType.END_IF,s);
default: return new Token(TokType.IDENT,s);
} }
} }
if (char.IsDigit(Peek())){
if (char.IsDigit(Peek())) {
var sb=new StringBuilder(); var sb=new StringBuilder();
while(char.IsDigit(Peek())) sb.Append(Next()); while (char.IsDigit(Peek())) sb.Append(Next());
return new Token(TokType.INT,sb.ToString()); return new Token(TokType.INT,sb.ToString());
} }
if (Peek()==':'){ Next(); if(Peek()=='='){Next(); return new Token(TokType.ASSIGN,":=");} }
// Operators and symbols
if (Peek()==':') { Next(); if(Peek()=='='){Next(); return new Token(TokType.ASSIGN,":=");} }
if (Peek()=='<') {
Next();
if (Peek()=='='){Next(); return new Token(TokType.LE,"<=");}
if (Peek()=='>'){Next(); return new Token(TokType.NEQ,"<>");}
return new Token(TokType.LT,"<");
}
if (Peek()=='>') { Next(); if (Peek()=='='){Next(); return new Token(TokType.GE,">=");} return new Token(TokType.GT,">"); }
if (Peek()=='=') { Next(); return new Token(TokType.EQ,"="); }
char c=Next(); char c=Next();
return c switch { return c switch {
';'=>new Token(TokType.SEMI,";"), ';'=>new Token(TokType.SEMI,";"),
@ -81,53 +111,105 @@ public class StParser {
StLexer lex; Token cur; StLexer lex; Token cur;
public StParser(string s){lex=new StLexer(s);cur=lex.NextToken();} public StParser(string s){lex=new StLexer(s);cur=lex.NextToken();}
void Next()=>cur=lex.NextToken(); void Next()=>cur=lex.NextToken();
void Expect(TokType t){if(cur.Type!=t)throw new Exception($"Expected {t}, got {cur.Type}");Next();} void Expect(TokType t){ if(cur.Type!=t) throw new Exception($"Expected {t}, got {cur.Type}"); Next(); }
public ProgramNode ParseProgram(){
public ProgramNode ParseProgram() {
var p=new ProgramNode(); var p=new ProgramNode();
Expect(TokType.PROGRAM); Expect(TokType.PROGRAM);
if(cur.Type==TokType.IDENT) Next(); if (cur.Type==TokType.IDENT) Next();
if(cur.Type==TokType.VAR){ if (cur.Type==TokType.VAR) {
Next(); Next();
while(cur.Type==TokType.IDENT) p.Vars.Add(ParseVarDecl()); while (cur.Type==TokType.IDENT) p.Vars.Add(ParseVarDecl());
Expect(TokType.END_VAR); Expect(TokType.END_VAR);
} }
while(cur.Type!=TokType.END_PROGRAM&&cur.Type!=TokType.EOF) while (cur.Type!=TokType.END_PROGRAM && cur.Type!=TokType.EOF)
p.Stmts.Add(ParseStmt()); p.Stmts.Add(ParseStmt());
Expect(TokType.END_PROGRAM); Expect(TokType.END_PROGRAM);
return p; return p;
} }
VarDecl ParseVarDecl(){
VarDecl ParseVarDecl() {
string name=cur.Text; Expect(TokType.IDENT); string name=cur.Text; Expect(TokType.IDENT);
string tname=cur.Text.ToLowerInvariant(); Expect(TokType.IDENT); string tname=cur.Text.ToLowerInvariant(); Expect(TokType.IDENT);
VarType vt=tname switch { VarType vt = tname switch {
"int8"=>VarType.Int8,"int16"=>VarType.Int16,"int32"=>VarType.Int32, "int8"=>VarType.Int8, "int16"=>VarType.Int16, "int32"=>VarType.Int32,
"byte"=>VarType.Byte,"bool"=>VarType.Bool,_=>throw new Exception($"Unknown type {tname}") "byte"=>VarType.Byte, "bool"=>VarType.Bool,
_=>throw new Exception($"Unknown type {tname}")
}; };
Expr? init=null; Expr? init=null;
if(cur.Type==TokType.ASSIGN){Next();init=ParseExpr();} if (cur.Type==TokType.ASSIGN){ Next(); init=ParseExpr(); }
Expect(TokType.SEMI); Expect(TokType.SEMI);
return new VarDecl{Name=name,Type=vt,Init=init}; return new VarDecl{Name=name,Type=vt,Init=init};
} }
Stmt ParseStmt(){
if(cur.Type==TokType.IDENT){ Stmt ParseStmt() {
var n=cur.Text;Next();Expect(TokType.ASSIGN); if (cur.Type==TokType.IF) return ParseIf();
var e=ParseExpr();Expect(TokType.SEMI); if (cur.Type==TokType.IDENT) {
var n=cur.Text; Next(); Expect(TokType.ASSIGN);
var e=ParseExpr(); Expect(TokType.SEMI);
return new AssignStmt{Target=n,Expr=e}; return new AssignStmt{Target=n,Expr=e};
} }
throw new Exception($"Invalid stmt start {cur.Type}"); throw new Exception($"Unexpected token in statement: {cur.Type}");
} }
Expr ParseExpr(){return ParseAddSub();}
Expr ParseAddSub(){var l=ParseMulDiv();while(cur.Type==TokType.PLUS||cur.Type==TokType.MINUS){var op=cur.Type;Next();var r=ParseMulDiv();l=new BinaryExpr(l,op,r);}return l;} IfStmt ParseIf() {
Expr ParseMulDiv(){var l=ParsePrimary();while(cur.Type==TokType.MUL||cur.Type==TokType.DIV){var op=cur.Type;Next();var r=ParsePrimary();l=new BinaryExpr(l,op,r);}return l;} Next(); // consume IF
Expr ParsePrimary(){ var cond = ParseExpr();
if(cur.Type==TokType.INT){int v=int.Parse(cur.Text);Next();return new IntExpr(v);} Expect(TokType.THEN);
if(cur.Type==TokType.IDENT){string n=cur.Text;Next();return new VarExpr(n);} var ifs = new IfStmt{Cond=cond};
if(cur.Type==TokType.LPAREN){Next();var e=ParseExpr();Expect(TokType.RPAREN);return e;} while(cur.Type!=TokType.ELSE && cur.Type!=TokType.END_IF)
ifs.ThenStmts.Add(ParseStmt());
if (cur.Type==TokType.ELSE) {
Next();
while(cur.Type!=TokType.END_IF)
ifs.ElseStmts.Add(ParseStmt());
}
Expect(TokType.END_IF);
Expect(TokType.SEMI);
return ifs;
}
Expr ParseExpr() => ParseCompare();
Expr ParseCompare() {
var l=ParseAddSub();
while(cur.Type is TokType.LT or TokType.GT or TokType.LE or TokType.GE or TokType.EQ or TokType.NEQ) {
var op=cur.Type; Next();
var r=ParseAddSub();
l=new BinaryExpr(l,op,r);
}
return l;
}
Expr ParseAddSub() {
var l=ParseMulDiv();
while(cur.Type==TokType.PLUS||cur.Type==TokType.MINUS){
var op=cur.Type;Next();
var r=ParseMulDiv();
l=new BinaryExpr(l,op,r);
}
return l;
}
Expr ParseMulDiv() {
var l=ParsePrimary();
while(cur.Type==TokType.MUL||cur.Type==TokType.DIV){
var op=cur.Type;Next();
var r=ParsePrimary();
l=new BinaryExpr(l,op,r);
}
return l;
}
Expr ParsePrimary() {
if (cur.Type==TokType.INT){int v=int.Parse(cur.Text);Next();return new IntExpr(v);}
if (cur.Type==TokType.IDENT){string n=cur.Text;Next();return new VarExpr(n);}
if (cur.Type==TokType.LPAREN){Next();var e=ParseExpr();Expect(TokType.RPAREN);return e;}
throw new Exception($"Unexpected token {cur.Type}"); throw new Exception($"Unexpected token {cur.Type}");
} }
} }
// === BYTECODE EMITTER === // === BYTECODE ===
public class BytecodeEmitter { public class BytecodeEmitter {
List<int> consts=new(); Dictionary<string,Symbol> syms=new(); List<byte> code=new(); List<int> consts=new(); Dictionary<string,Symbol> syms=new(); List<byte> code=new();
class Symbol{public string Name;public VarType Type;public int Index;} class Symbol{public string Name;public VarType Type;public int Index;}
@ -135,19 +217,12 @@ public class BytecodeEmitter {
public void Compile(ProgramNode p){ public void Compile(ProgramNode p){
int idx=0; int idx=0;
// Pass 1: Definiere Variablen (ohne Init)
foreach(var v in p.Vars) foreach(var v in p.Vars)
syms[v.Name]=new Symbol{Name=v.Name,Type=v.Type,Index=idx++}; syms[v.Name]=new Symbol{Name=v.Name,Type=v.Type,Index=idx++};
// Pass 2: Generiere Initialisierungscode foreach(var v in p.Vars)
foreach(var v in p.Vars){ if(v.Init!=null){ EmitExpr(v.Init); EmitByte(0x03); EmitU16((ushort)syms[v.Name].Index); }
if(v.Init!=null){
EmitExpr(v.Init);
EmitByte(0x03); EmitU16((ushort)syms[v.Name].Index);
}
}
// Main-Code
foreach(var s in p.Stmts) foreach(var s in p.Stmts)
EmitStmt(s); EmitStmt(s);
@ -155,25 +230,46 @@ public class BytecodeEmitter {
} }
void EmitStmt(Stmt s){ void EmitStmt(Stmt s){
if(s is AssignStmt a){ switch(s){
EmitExpr(a.Expr); case AssignStmt a:
EmitByte(0x03); EmitU16((ushort)syms[a.Target].Index); EmitExpr(a.Expr);
EmitByte(0x03); EmitU16((ushort)syms[a.Target].Index);
break;
case IfStmt iff:
EmitExpr(iff.Cond);
EmitByte(0x20); // JZ (jump if zero)
int jzPos = code.Count; EmitU16(0);
foreach(var st in iff.ThenStmts) EmitStmt(st);
if (iff.ElseStmts.Count>0){
EmitByte(0x21); // JMP unconditional
int jmpPos = code.Count; EmitU16(0);
PatchJump(jzPos, code.Count);
foreach(var st in iff.ElseStmts) EmitStmt(st);
PatchJump(jmpPos, code.Count);
} else {
PatchJump(jzPos, code.Count);
}
break;
default:
throw new Exception($"Unhandled stmt {s.GetType().Name}");
} }
} }
void PatchJump(int pos,int target){ code[pos]=(byte)(target&0xFF); code[pos+1]=(byte)(target>>8); }
void EmitExpr(Expr e){ void EmitExpr(Expr e){
switch(e){ switch(e){
case IntExpr ie: case IntExpr ie:
int ci=AddConst(ie.Value); EmitByte(0x01); EmitU16((ushort)ci); break; int ci=AddConst(ie.Value); EmitByte(0x01); EmitU16((ushort)ci); break;
case VarExpr ve: case VarExpr ve:
if(!syms.ContainsKey(ve.Name))
throw new Exception($"Unknown variable {ve.Name}");
int vi=syms[ve.Name].Index; EmitByte(0x02); EmitU16((ushort)vi); break; int vi=syms[ve.Name].Index; EmitByte(0x02); EmitU16((ushort)vi); break;
case BinaryExpr be: case BinaryExpr be:
EmitExpr(be.L); EmitExpr(be.R); EmitExpr(be.L); EmitExpr(be.R);
EmitByte(be.Op switch { EmitByte(be.Op switch {
TokType.PLUS=>0x10, TokType.MINUS=>0x11, TokType.MUL=>0x12, TokType.DIV=>0x13, TokType.PLUS=>0x10, TokType.MINUS=>0x11, TokType.MUL=>0x12, TokType.DIV=>0x13,
_=>throw new Exception("bad op") TokType.LT=>0x14, TokType.GT=>0x15, TokType.LE=>0x16, TokType.GE=>0x17,
TokType.EQ=>0x18, TokType.NEQ=>0x19,
_=>throw new Exception($"Bad op {be.Op}")
}); });
break; break;
default: throw new Exception("bad expr"); default: throw new Exception("bad expr");

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input.st
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@ -1,9 +1,14 @@
PROGRAM Demo PROGRAM Demo
VAR VAR
a int16 := 5; a int16 := 3;
b byte := a + 3; b int16 := 5;
c int32 := b * 2; c int16;
END_VAR END_VAR
a := a + c; IF a < b THEN
c := b - a;
ELSE
c := a - b;
END_IF;
END_PROGRAM END_PROGRAM

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obj/Debug/net8.0/Compiler.AssemblyInfo.cs
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@ -13,10 +13,10 @@ using System.Reflection;
[assembly: System.Reflection.AssemblyCompanyAttribute("Compiler")] [assembly: System.Reflection.AssemblyCompanyAttribute("Compiler")]
[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")] [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")] [assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+0e549b6e0a943de51ec80a7d726000f16f5498dd")]
[assembly: System.Reflection.AssemblyProductAttribute("Compiler")] [assembly: System.Reflection.AssemblyProductAttribute("Compiler")]
[assembly: System.Reflection.AssemblyTitleAttribute("Compiler")] [assembly: System.Reflection.AssemblyTitleAttribute("Compiler")]
[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
// Generated by the MSBuild WriteCodeFragment class. // Von der MSBuild WriteCodeFragment-Klasse generiert.

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obj/Debug/net8.0/Compiler.AssemblyInfoInputs.cache
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@ -1 +1 @@
595ce70373ddd00c09969aa302b9639c0cb84849045f0786c137462a6cbd7825 f8051df38f7774448e56868f6a91a5557659f77e4a8558098bdfd3e3ba758ea4

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obj/Debug/net8.0/ref/Compiler.dll
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