From 39e5b5a89416b1902c1f25ab0c753d16a1c2464c Mon Sep 17 00:00:00 2001
From: jespergravgaard <jesper@balmangravgaard.dk>
Date: Sun, 21 May 2017 12:56:11 +0200
Subject: [PATCH] Added do {} while(). Fixed relative jump labels. Added fib2 &
 y-usage.

---
 src/dk/camelot64/kickc/asm/AsmFragment.java   |  14 +-
 .../kickc/asm/fragment/xby_neq_0_then_la1.asm |   2 +
 .../kickc/asm/fragment/yby=coby1.asm          |   1 +
 .../kickc/asm/fragment/yby=zpby1.asm          |   1 +
 .../asm/fragment/zpby1=yby_plus_zpby2.asm     |   4 +
 .../camelot64/kickc/icl/ControlFlowBlock.java |   8 +
 .../icl/Pass1GenerateStatementSequence.java   |  12 +
 .../kickc/icl/Pass3RegisterAllocation.java    |   6 +-
 .../kickc/icl/Pass4CodeGeneration.java        |  13 +-
 .../kickc/icl/RegisterAllocation.java         |  26 +-
 src/dk/camelot64/kickc/parser/KickC.g4        |   1 +
 src/dk/camelot64/kickc/parser/KickC.tokens    |  68 ++---
 .../kickc/parser/KickCBaseListener.java       |  12 +
 .../kickc/parser/KickCBaseVisitor.java        |   7 +
 src/dk/camelot64/kickc/parser/KickCLexer.java | 247 +++++++++---------
 .../camelot64/kickc/parser/KickCLexer.tokens  |  68 ++---
 .../camelot64/kickc/parser/KickCListener.java |  12 +
 .../camelot64/kickc/parser/KickCParser.java   | 180 ++++++++-----
 .../camelot64/kickc/parser/KickCVisitor.java  |   7 +
 src/dk/camelot64/kickc/test/Main.java         |  13 +-
 src/dk/camelot64/kickc/test/fib2.kc           |  10 +
 21 files changed, 437 insertions(+), 275 deletions(-)
 create mode 100644 src/dk/camelot64/kickc/asm/fragment/xby_neq_0_then_la1.asm
 create mode 100644 src/dk/camelot64/kickc/asm/fragment/yby=coby1.asm
 create mode 100644 src/dk/camelot64/kickc/asm/fragment/yby=zpby1.asm
 create mode 100644 src/dk/camelot64/kickc/asm/fragment/zpby1=yby_plus_zpby2.asm
 create mode 100644 src/dk/camelot64/kickc/test/fib2.kc

diff --git a/src/dk/camelot64/kickc/asm/AsmFragment.java b/src/dk/camelot64/kickc/asm/AsmFragment.java
index c1f0aa66f..3df80db4f 100644
--- a/src/dk/camelot64/kickc/asm/AsmFragment.java
+++ b/src/dk/camelot64/kickc/asm/AsmFragment.java
@@ -32,7 +32,7 @@ public class AsmFragment {
     */
    private String signature;
 
-   public AsmFragment(StatementConditionalJump conditionalJump, SymbolTable symbols) {
+   public AsmFragment(StatementConditionalJump conditionalJump, SymbolTable symbols, ControlFlowGraph graph, ControlFlowBlock block) {
       this.bindings = new HashMap<>();
       this.symbols = symbols;
       StringBuilder signature = new StringBuilder();
@@ -48,7 +48,13 @@ public class AsmFragment {
          signature.append(bind(conditionalJump.getRValue2()));
       }
       signature.append("_then_");
-      signature.append(bind(conditionalJump.getDestination()));
+      Label destination = conditionalJump.getDestination();
+      ControlFlowBlock destinationBlock = graph.getBlock(destination);
+      String destinationLabel = destination.getName();
+      if(destinationBlock.hasPhiStatements()) {
+         destinationLabel = destination.getName()+"_from_"+block.getLabel().getName();
+      }
+      signature.append(bind(new Label(destinationLabel, false)));
       setSignature(signature.toString());
    }
 
@@ -172,6 +178,10 @@ public class AsmFragment {
             String name = "xby";
             bindings.put(name, value);
             return name;
+         } else if (RegisterAllocation.RegisterType.REG_Y_BYTE.equals(register.getType())) {
+            String name = "yby";
+            bindings.put(name, value);
+            return name;
          } else {
             throw new RuntimeException("Binding of register type not supported " + register.getType());
          }
diff --git a/src/dk/camelot64/kickc/asm/fragment/xby_neq_0_then_la1.asm b/src/dk/camelot64/kickc/asm/fragment/xby_neq_0_then_la1.asm
new file mode 100644
index 000000000..0f99f0508
--- /dev/null
+++ b/src/dk/camelot64/kickc/asm/fragment/xby_neq_0_then_la1.asm
@@ -0,0 +1,2 @@
+cpx #0
+bne {la1}
\ No newline at end of file
diff --git a/src/dk/camelot64/kickc/asm/fragment/yby=coby1.asm b/src/dk/camelot64/kickc/asm/fragment/yby=coby1.asm
new file mode 100644
index 000000000..c9907eace
--- /dev/null
+++ b/src/dk/camelot64/kickc/asm/fragment/yby=coby1.asm
@@ -0,0 +1 @@
+ldy #{coby1}
\ No newline at end of file
diff --git a/src/dk/camelot64/kickc/asm/fragment/yby=zpby1.asm b/src/dk/camelot64/kickc/asm/fragment/yby=zpby1.asm
new file mode 100644
index 000000000..cc9e7b012
--- /dev/null
+++ b/src/dk/camelot64/kickc/asm/fragment/yby=zpby1.asm
@@ -0,0 +1 @@
+ldy {zpby1}
\ No newline at end of file
diff --git a/src/dk/camelot64/kickc/asm/fragment/zpby1=yby_plus_zpby2.asm b/src/dk/camelot64/kickc/asm/fragment/zpby1=yby_plus_zpby2.asm
new file mode 100644
index 000000000..56a5f591f
--- /dev/null
+++ b/src/dk/camelot64/kickc/asm/fragment/zpby1=yby_plus_zpby2.asm
@@ -0,0 +1,4 @@
+tya
+clc
+adc {zpby2}
+sta {zpby1}
\ No newline at end of file
diff --git a/src/dk/camelot64/kickc/icl/ControlFlowBlock.java b/src/dk/camelot64/kickc/icl/ControlFlowBlock.java
index 07beaf984..12d411846 100644
--- a/src/dk/camelot64/kickc/icl/ControlFlowBlock.java
+++ b/src/dk/camelot64/kickc/icl/ControlFlowBlock.java
@@ -104,4 +104,12 @@ public class ControlFlowBlock {
       return label.hashCode();
    }
 
+   public boolean hasPhiStatements() {
+      if(statements.size()>0) {
+         if(statements.get(0) instanceof StatementPhi) {
+            return true;
+         }
+      }
+      return false;
+   }
 }
diff --git a/src/dk/camelot64/kickc/icl/Pass1GenerateStatementSequence.java b/src/dk/camelot64/kickc/icl/Pass1GenerateStatementSequence.java
index 41bc59f0e..5de45ba40 100644
--- a/src/dk/camelot64/kickc/icl/Pass1GenerateStatementSequence.java
+++ b/src/dk/camelot64/kickc/icl/Pass1GenerateStatementSequence.java
@@ -97,6 +97,18 @@ public class Pass1GenerateStatementSequence extends KickCBaseVisitor<RValue> {
       return null;
    }
 
+   @Override
+   public RValue visitStmtDoWhile(KickCParser.StmtDoWhileContext ctx) {
+      Label beginJumpLabel = symbolTable.newIntermediateJumpLabel();
+      StatementJumpTarget beginJumpTarget = new StatementJumpTarget(beginJumpLabel);
+      sequence.addStatement(beginJumpTarget);
+      this.visit(ctx.stmt());
+      RValue rValue = this.visit(ctx.expr());
+      Statement doJmpStmt = new StatementConditionalJump(rValue, beginJumpLabel);
+      sequence.addStatement(doJmpStmt);
+      return null;
+   }
+
    @Override
    public RValue visitStmtAssignment(KickCParser.StmtAssignmentContext ctx) {
       if(ctx.TYPE()!=null) {
diff --git a/src/dk/camelot64/kickc/icl/Pass3RegisterAllocation.java b/src/dk/camelot64/kickc/icl/Pass3RegisterAllocation.java
index be44c4180..05efa95c0 100644
--- a/src/dk/camelot64/kickc/icl/Pass3RegisterAllocation.java
+++ b/src/dk/camelot64/kickc/icl/Pass3RegisterAllocation.java
@@ -23,9 +23,9 @@ public class Pass3RegisterAllocation {
             }
       }
       allocation.allocate(symbols.getVariable("i#1"), RegisterAllocation.getRegisterX());
-      allocation.allocate(symbols.getVariable("i#3"), RegisterAllocation.getRegisterX());
-      allocation.allocate(symbols.getVariable("n1#1"), new RegisterAllocation.RegisterZpByte(8));
-      allocation.allocate(symbols.getVariable("n1#2"), new RegisterAllocation.RegisterZpByte(8));
+      allocation.allocate(symbols.getVariable("i#2"), RegisterAllocation.getRegisterX());
+      allocation.allocate(symbols.getVariable("n1#1"), RegisterAllocation.getRegisterY());
+      allocation.allocate(symbols.getVariable("n1#2"), RegisterAllocation.getRegisterY());
       symbols.setAllocation(allocation);
    }
 
diff --git a/src/dk/camelot64/kickc/icl/Pass4CodeGeneration.java b/src/dk/camelot64/kickc/icl/Pass4CodeGeneration.java
index cc8184b7f..08499a86e 100644
--- a/src/dk/camelot64/kickc/icl/Pass4CodeGeneration.java
+++ b/src/dk/camelot64/kickc/icl/Pass4CodeGeneration.java
@@ -2,8 +2,6 @@ package dk.camelot64.kickc.icl;
 
 import dk.camelot64.kickc.asm.*;
 
-import java.util.List;
-
 /**
  * Code Generation of 6502 Assembler from ICL/SSA Control Flow Graph
  */
@@ -29,7 +27,7 @@ public class Pass4CodeGeneration {
          // Generate exit
          ControlFlowBlock defaultSuccessor = block.getDefaultSuccessor();
          if (defaultSuccessor != null) {
-            if(defaultSuccessor.getStatements().size()>0 && defaultSuccessor.getStatements().get(0) instanceof StatementPhi) {
+            if(defaultSuccessor.hasPhiStatements()) {
                genBlockPhiTransition(asm, block, defaultSuccessor);
             }
             asm.addInstruction("JMP", AsmAddressingMode.ABS, defaultSuccessor.getLabel().getName().replace('@', 'B'));
@@ -41,18 +39,18 @@ public class Pass4CodeGeneration {
    private void genStatements(AsmProgram asm, ControlFlowBlock block) {
       for (Statement statement : block.getStatements()) {
          if (!(statement instanceof StatementPhi)) {
-            genStatement(asm, statement);
+            genStatement(asm, statement, block);
          }
       }
    }
 
-   private void genStatement(AsmProgram asm, Statement statement) {
+   private void genStatement(AsmProgram asm, Statement statement, ControlFlowBlock block) {
       if (statement instanceof StatementAssignment) {
          AsmFragment asmFragment = new AsmFragment((StatementAssignment) statement, symbols);
          asm.addComment(statement + "  //  " + asmFragment.getSignature());
          asmFragment.generate(asm);
       } else if (statement instanceof StatementConditionalJump) {
-         AsmFragment asmFragment = new AsmFragment((StatementConditionalJump) statement, symbols);
+         AsmFragment asmFragment = new AsmFragment((StatementConditionalJump) statement, symbols, graph, block);
          asm.addComment(statement + "  //  " + asmFragment.getSignature());
          asmFragment.generate(asm);
       } else {
@@ -61,8 +59,7 @@ public class Pass4CodeGeneration {
    }
 
    private void genBlockEntryPoints(AsmProgram asm, ControlFlowBlock block) {
-      List<Statement> statements = block.getStatements();
-      if (statements.size() > 0 && (statements.get(0) instanceof StatementPhi)) {
+      if(block.hasPhiStatements()) {
          for (ControlFlowBlock predecessor : block.getPredecessors()) {
             if(block.equals(predecessor.getConditionalSuccessor())) {
                genBlockPhiTransition(asm, predecessor, block);
diff --git a/src/dk/camelot64/kickc/icl/RegisterAllocation.java b/src/dk/camelot64/kickc/icl/RegisterAllocation.java
index 683be78ea..69b9069bd 100644
--- a/src/dk/camelot64/kickc/icl/RegisterAllocation.java
+++ b/src/dk/camelot64/kickc/icl/RegisterAllocation.java
@@ -36,7 +36,7 @@ public class RegisterAllocation {
 
    /** The register type. */
    public enum RegisterType {
-      ZP_BYTE, ZP_BOOL, REG_X_BYTE
+      ZP_BYTE, ZP_BOOL, REG_Y_BYTE, REG_X_BYTE
    };
 
    /** A zero page address used as a register for a single byte variable. */
@@ -136,10 +136,34 @@ public class RegisterAllocation {
       }
    }
 
+   /** The Y register. */
+   public static class RegisterYByte implements Register {
+      @Override
+      public RegisterType getType() {
+         return RegisterType.REG_Y_BYTE;
+      }
+
+      @Override
+      public String toString() {
+         return "reg byte y";
+      }
+
+      @Override
+      public boolean equals(Object obj) {
+         if (this == obj) return true;
+         if (obj == null || getClass() != obj.getClass()) return false;
+         return true;
+      }
+   }
+
    public static Register getRegisterX() {
       return new RegisterXByte();
    }
 
+   public static Register getRegisterY() {
+      return new RegisterYByte();
+   }
+
    @Override
    public String toString() {
       StringBuffer out = new StringBuffer();
diff --git a/src/dk/camelot64/kickc/parser/KickC.g4 b/src/dk/camelot64/kickc/parser/KickC.g4
index 791e091e2..19ad17d2e 100644
--- a/src/dk/camelot64/kickc/parser/KickC.g4
+++ b/src/dk/camelot64/kickc/parser/KickC.g4
@@ -15,6 +15,7 @@ stmt
     | expr  ';' #stmtExpr
     | 'if' '(' expr ')' stmt ( 'else' stmt )? #stmtIfElse
     | 'while' '(' expr ')' stmt  #stmtWhile
+    | 'do' stmt 'while' '(' expr ')' #stmtDoWhile
     ;
 
 
diff --git a/src/dk/camelot64/kickc/parser/KickC.tokens b/src/dk/camelot64/kickc/parser/KickC.tokens
index 69c474e0f..fb63df5b8 100644
--- a/src/dk/camelot64/kickc/parser/KickC.tokens
+++ b/src/dk/camelot64/kickc/parser/KickC.tokens
@@ -26,20 +26,21 @@ T__24=25
 T__25=26
 T__26=27
 T__27=28
-TYPE=29
-STRING=30
-BOOLEAN=31
-NUMBER=32
-NUMFLOAT=33
-BINFLOAT=34
-DECFLOAT=35
-HEXFLOAT=36
-NUMINT=37
-BININTEGER=38
-DECINTEGER=39
-HEXINTEGER=40
-NAME=41
-WS=42
+T__28=29
+TYPE=30
+STRING=31
+BOOLEAN=32
+NUMBER=33
+NUMFLOAT=34
+BINFLOAT=35
+DECFLOAT=36
+HEXFLOAT=37
+NUMINT=38
+BININTEGER=39
+DECINTEGER=40
+HEXINTEGER=41
+NAME=42
+WS=43
 '{'=1
 '}'=2
 '='=3
@@ -49,22 +50,23 @@ WS=42
 ')'=7
 'else'=8
 'while'=9
-'+'=10
-'-'=11
-'not'=12
-'!'=13
-'*'=14
-'/'=15
-'=='=16
-'!='=17
-'<>'=18
-'<'=19
-'<='=20
-'=<'=21
-'>='=22
-'=>'=23
-'>'=24
-'and'=25
-'&&'=26
-'or'=27
-'||'=28
+'do'=10
+'+'=11
+'-'=12
+'not'=13
+'!'=14
+'*'=15
+'/'=16
+'=='=17
+'!='=18
+'<>'=19
+'<'=20
+'<='=21
+'=<'=22
+'>='=23
+'=>'=24
+'>'=25
+'and'=26
+'&&'=27
+'or'=28
+'||'=29
diff --git a/src/dk/camelot64/kickc/parser/KickCBaseListener.java b/src/dk/camelot64/kickc/parser/KickCBaseListener.java
index dd59af9bd..1f24d9c7f 100644
--- a/src/dk/camelot64/kickc/parser/KickCBaseListener.java
+++ b/src/dk/camelot64/kickc/parser/KickCBaseListener.java
@@ -95,6 +95,18 @@ public class KickCBaseListener implements KickCListener {
 	 * <p>The default implementation does nothing.</p>
 	 */
 	@Override public void exitStmtWhile(KickCParser.StmtWhileContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtDoWhile(KickCParser.StmtDoWhileContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtDoWhile(KickCParser.StmtDoWhileContext ctx) { }
 	/**
 	 * {@inheritDoc}
 	 *
diff --git a/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java b/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
index 01e0a560f..bbaa7ecaf 100644
--- a/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
+++ b/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
@@ -60,6 +60,13 @@ public class KickCBaseVisitor<T> extends AbstractParseTreeVisitor<T> implements
 	 * {@link #visitChildren} on {@code ctx}.</p>
 	 */
 	@Override public T visitStmtWhile(KickCParser.StmtWhileContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtDoWhile(KickCParser.StmtDoWhileContext ctx) { return visitChildren(ctx); }
 	/**
 	 * {@inheritDoc}
 	 *
diff --git a/src/dk/camelot64/kickc/parser/KickCLexer.java b/src/dk/camelot64/kickc/parser/KickCLexer.java
index 57d8252cc..ffa71b9e2 100644
--- a/src/dk/camelot64/kickc/parser/KickCLexer.java
+++ b/src/dk/camelot64/kickc/parser/KickCLexer.java
@@ -20,9 +20,9 @@ public class KickCLexer extends Lexer {
 		T__0=1, T__1=2, T__2=3, T__3=4, T__4=5, T__5=6, T__6=7, T__7=8, T__8=9, 
 		T__9=10, T__10=11, T__11=12, T__12=13, T__13=14, T__14=15, T__15=16, T__16=17, 
 		T__17=18, T__18=19, T__19=20, T__20=21, T__21=22, T__22=23, T__23=24, 
-		T__24=25, T__25=26, T__26=27, T__27=28, TYPE=29, STRING=30, BOOLEAN=31, 
-		NUMBER=32, NUMFLOAT=33, BINFLOAT=34, DECFLOAT=35, HEXFLOAT=36, NUMINT=37, 
-		BININTEGER=38, DECINTEGER=39, HEXINTEGER=40, NAME=41, WS=42;
+		T__24=25, T__25=26, T__26=27, T__27=28, T__28=29, TYPE=30, STRING=31, 
+		BOOLEAN=32, NUMBER=33, NUMFLOAT=34, BINFLOAT=35, DECFLOAT=36, HEXFLOAT=37, 
+		NUMINT=38, BININTEGER=39, DECINTEGER=40, HEXINTEGER=41, NAME=42, WS=43;
 	public static String[] channelNames = {
 		"DEFAULT_TOKEN_CHANNEL", "HIDDEN"
 	};
@@ -35,23 +35,24 @@ public class KickCLexer extends Lexer {
 		"T__0", "T__1", "T__2", "T__3", "T__4", "T__5", "T__6", "T__7", "T__8", 
 		"T__9", "T__10", "T__11", "T__12", "T__13", "T__14", "T__15", "T__16", 
 		"T__17", "T__18", "T__19", "T__20", "T__21", "T__22", "T__23", "T__24", 
-		"T__25", "T__26", "T__27", "TYPE", "STRING", "BOOLEAN", "NUMBER", "NUMFLOAT", 
-		"BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", "DECINTEGER", 
-		"HEXINTEGER", "BINDIGIT", "DECDIGIT", "HEXDIGIT", "NAME", "NAME_START", 
-		"NAME_CHAR", "WS"
+		"T__25", "T__26", "T__27", "T__28", "TYPE", "STRING", "BOOLEAN", "NUMBER", 
+		"NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", 
+		"DECINTEGER", "HEXINTEGER", "BINDIGIT", "DECDIGIT", "HEXDIGIT", "NAME", 
+		"NAME_START", "NAME_CHAR", "WS"
 	};
 
 	private static final String[] _LITERAL_NAMES = {
 		null, "'{'", "'}'", "'='", "';'", "'if'", "'('", "')'", "'else'", "'while'", 
-		"'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'=='", "'!='", "'<>'", "'<'", 
-		"'<='", "'=<'", "'>='", "'=>'", "'>'", "'and'", "'&&'", "'or'", "'||'"
+		"'do'", "'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'=='", "'!='", "'<>'", 
+		"'<'", "'<='", "'=<'", "'>='", "'=>'", "'>'", "'and'", "'&&'", "'or'", 
+		"'||'"
 	};
 	private static final String[] _SYMBOLIC_NAMES = {
 		null, null, null, null, null, null, null, null, null, null, null, null, 
 		null, null, null, null, null, null, null, null, null, null, null, null, 
-		null, null, null, null, null, "TYPE", "STRING", "BOOLEAN", "NUMBER", "NUMFLOAT", 
-		"BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", "DECINTEGER", 
-		"HEXINTEGER", "NAME", "WS"
+		null, null, null, null, null, null, "TYPE", "STRING", "BOOLEAN", "NUMBER", 
+		"NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", 
+		"DECINTEGER", "HEXINTEGER", "NAME", "WS"
 	};
 	public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -111,121 +112,123 @@ public class KickCLexer extends Lexer {
 	public ATN getATN() { return _ATN; }
 
 	public static final String _serializedATN =
-		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\2,\u0154\b\1\4\2\t"+
+		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\2-\u0159\b\1\4\2\t"+
 		"\2\4\3\t\3\4\4\t\4\4\5\t\5\4\6\t\6\4\7\t\7\4\b\t\b\4\t\t\t\4\n\t\n\4\13"+
 		"\t\13\4\f\t\f\4\r\t\r\4\16\t\16\4\17\t\17\4\20\t\20\4\21\t\21\4\22\t\22"+
 		"\4\23\t\23\4\24\t\24\4\25\t\25\4\26\t\26\4\27\t\27\4\30\t\30\4\31\t\31"+
 		"\4\32\t\32\4\33\t\33\4\34\t\34\4\35\t\35\4\36\t\36\4\37\t\37\4 \t \4!"+
 		"\t!\4\"\t\"\4#\t#\4$\t$\4%\t%\4&\t&\4\'\t\'\4(\t(\4)\t)\4*\t*\4+\t+\4"+
-		",\t,\4-\t-\4.\t.\4/\t/\4\60\t\60\3\2\3\2\3\3\3\3\3\4\3\4\3\5\3\5\3\6\3"+
-		"\6\3\6\3\7\3\7\3\b\3\b\3\t\3\t\3\t\3\t\3\t\3\n\3\n\3\n\3\n\3\n\3\n\3\13"+
-		"\3\13\3\f\3\f\3\r\3\r\3\r\3\r\3\16\3\16\3\17\3\17\3\20\3\20\3\21\3\21"+
-		"\3\21\3\22\3\22\3\22\3\23\3\23\3\23\3\24\3\24\3\25\3\25\3\25\3\26\3\26"+
-		"\3\26\3\27\3\27\3\27\3\30\3\30\3\30\3\31\3\31\3\32\3\32\3\32\3\32\3\33"+
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+		"\6\2\62;C\\aac|\5\2\13\f\17\17\"\"\2\u0171\2\3\3\2\2\2\2\5\3\2\2\2\2\7"+
+		"\3\2\2\2\2\t\3\2\2\2\2\13\3\2\2\2\2\r\3\2\2\2\2\17\3\2\2\2\2\21\3\2\2"+
+		"\2\2\23\3\2\2\2\2\25\3\2\2\2\2\27\3\2\2\2\2\31\3\2\2\2\2\33\3\2\2\2\2"+
+		"\35\3\2\2\2\2\37\3\2\2\2\2!\3\2\2\2\2#\3\2\2\2\2%\3\2\2\2\2\'\3\2\2\2"+
+		"\2)\3\2\2\2\2+\3\2\2\2\2-\3\2\2\2\2/\3\2\2\2\2\61\3\2\2\2\2\63\3\2\2\2"+
+		"\2\65\3\2\2\2\2\67\3\2\2\2\29\3\2\2\2\2;\3\2\2\2\2=\3\2\2\2\2?\3\2\2\2"+
+		"\2A\3\2\2\2\2C\3\2\2\2\2E\3\2\2\2\2G\3\2\2\2\2I\3\2\2\2\2K\3\2\2\2\2M"+
+		"\3\2\2\2\2O\3\2\2\2\2Q\3\2\2\2\2S\3\2\2\2\2[\3\2\2\2\2a\3\2\2\2\3c\3\2"+
+		"\2\2\5e\3\2\2\2\7g\3\2\2\2\ti\3\2\2\2\13k\3\2\2\2\rn\3\2\2\2\17p\3\2\2"+
+		"\2\21r\3\2\2\2\23w\3\2\2\2\25}\3\2\2\2\27\u0080\3\2\2\2\31\u0082\3\2\2"+
+		"\2\33\u0084\3\2\2\2\35\u0088\3\2\2\2\37\u008a\3\2\2\2!\u008c\3\2\2\2#"+
+		"\u008e\3\2\2\2%\u0091\3\2\2\2\'\u0094\3\2\2\2)\u0097\3\2\2\2+\u0099\3"+
+		"\2\2\2-\u009c\3\2\2\2/\u009f\3\2\2\2\61\u00a2\3\2\2\2\63\u00a5\3\2\2\2"+
+		"\65\u00a7\3\2\2\2\67\u00ab\3\2\2\29\u00ae\3\2\2\2;\u00b1\3\2\2\2=\u00c9"+
+		"\3\2\2\2?\u00cb\3\2\2\2A\u00df\3\2\2\2C\u00e3\3\2\2\2E\u00e8\3\2\2\2G"+
+		"\u00ef\3\2\2\2I\u0100\3\2\2\2K\u010e\3\2\2\2M\u011f\3\2\2\2O\u012e\3\2"+
+		"\2\2Q\u0131\3\2\2\2S\u013a\3\2\2\2U\u0141\3\2\2\2W\u0143\3\2\2\2Y\u0145"+
+		"\3\2\2\2[\u0147\3\2\2\2]\u014e\3\2\2\2_\u0150\3\2\2\2a\u0153\3\2\2\2c"+
+		"d\7}\2\2d\4\3\2\2\2ef\7\177\2\2f\6\3\2\2\2gh\7?\2\2h\b\3\2\2\2ij\7=\2"+
+		"\2j\n\3\2\2\2kl\7k\2\2lm\7h\2\2m\f\3\2\2\2no\7*\2\2o\16\3\2\2\2pq\7+\2"+
+		"\2q\20\3\2\2\2rs\7g\2\2st\7n\2\2tu\7u\2\2uv\7g\2\2v\22\3\2\2\2wx\7y\2"+
+		"\2xy\7j\2\2yz\7k\2\2z{\7n\2\2{|\7g\2\2|\24\3\2\2\2}~\7f\2\2~\177\7q\2"+
+		"\2\177\26\3\2\2\2\u0080\u0081\7-\2\2\u0081\30\3\2\2\2\u0082\u0083\7/\2"+
+		"\2\u0083\32\3\2\2\2\u0084\u0085\7p\2\2\u0085\u0086\7q\2\2\u0086\u0087"+
+		"\7v\2\2\u0087\34\3\2\2\2\u0088\u0089\7#\2\2\u0089\36\3\2\2\2\u008a\u008b"+
+		"\7,\2\2\u008b \3\2\2\2\u008c\u008d\7\61\2\2\u008d\"\3\2\2\2\u008e\u008f"+
+		"\7?\2\2\u008f\u0090\7?\2\2\u0090$\3\2\2\2\u0091\u0092\7#\2\2\u0092\u0093"+
+		"\7?\2\2\u0093&\3\2\2\2\u0094\u0095\7>\2\2\u0095\u0096\7@\2\2\u0096(\3"+
+		"\2\2\2\u0097\u0098\7>\2\2\u0098*\3\2\2\2\u0099\u009a\7>\2\2\u009a\u009b"+
+		"\7?\2\2\u009b,\3\2\2\2\u009c\u009d\7?\2\2\u009d\u009e\7>\2\2\u009e.\3"+
+		"\2\2\2\u009f\u00a0\7@\2\2\u00a0\u00a1\7?\2\2\u00a1\60\3\2\2\2\u00a2\u00a3"+
+		"\7?\2\2\u00a3\u00a4\7@\2\2\u00a4\62\3\2\2\2\u00a5\u00a6\7@\2\2\u00a6\64"+
+		"\3\2\2\2\u00a7\u00a8\7c\2\2\u00a8\u00a9\7p\2\2\u00a9\u00aa\7f\2\2\u00aa"+
+		"\66\3\2\2\2\u00ab\u00ac\7(\2\2\u00ac\u00ad\7(\2\2\u00ad8\3\2\2\2\u00ae"+
+		"\u00af\7q\2\2\u00af\u00b0\7t\2\2\u00b0:\3\2\2\2\u00b1\u00b2\7~\2\2\u00b2"+
+		"\u00b3\7~\2\2\u00b3<\3\2\2\2\u00b4\u00b5\7d\2\2\u00b5\u00b6\7{\2\2\u00b6"+
+		"\u00b7\7v\2\2\u00b7\u00ca\7g\2\2\u00b8\u00b9\7y\2\2\u00b9\u00ba\7q\2\2"+
+		"\u00ba\u00bb\7t\2\2\u00bb\u00ca\7f\2\2\u00bc\u00bd\7u\2\2\u00bd\u00be"+
+		"\7v\2\2\u00be\u00bf\7t\2\2\u00bf\u00c0\7k\2\2\u00c0\u00c1\7p\2\2\u00c1"+
+		"\u00ca\7i\2\2\u00c2\u00c3\7d\2\2\u00c3\u00c4\7q\2\2\u00c4\u00c5\7q\2\2"+
+		"\u00c5\u00c6\7n\2\2\u00c6\u00c7\7g\2\2\u00c7\u00c8\7c\2\2\u00c8\u00ca"+
+		"\7p\2\2\u00c9\u00b4\3\2\2\2\u00c9\u00b8\3\2\2\2\u00c9\u00bc\3\2\2\2\u00c9"+
+		"\u00c2\3\2\2\2\u00ca>\3\2\2\2\u00cb\u00d1\7$\2\2\u00cc\u00cd\7^\2\2\u00cd"+
+		"\u00d0\7$\2\2\u00ce\u00d0\n\2\2\2\u00cf\u00cc\3\2\2\2\u00cf\u00ce\3\2"+
+		"\2\2\u00d0\u00d3\3\2\2\2\u00d1\u00cf\3\2\2\2\u00d1\u00d2\3\2\2\2\u00d2"+
+		"\u00d4\3\2\2\2\u00d3\u00d1\3\2\2\2\u00d4\u00d5\7$\2\2\u00d5@\3\2\2\2\u00d6"+
+		"\u00d7\7v\2\2\u00d7\u00d8\7t\2\2\u00d8\u00d9\7w\2\2\u00d9\u00e0\7g\2\2"+
+		"\u00da\u00db\7h\2\2\u00db\u00dc\7c\2\2\u00dc\u00dd\7n\2\2\u00dd\u00de"+
+		"\7u\2\2\u00de\u00e0\7g\2\2\u00df\u00d6\3\2\2\2\u00df\u00da\3\2\2\2\u00e0"+
+		"B\3\2\2\2\u00e1\u00e4\5E#\2\u00e2\u00e4\5M\'\2\u00e3\u00e1\3\2\2\2\u00e3"+
+		"\u00e2\3\2\2\2\u00e4D\3\2\2\2\u00e5\u00e9\5G$\2\u00e6\u00e9\5I%\2\u00e7"+
+		"\u00e9\5K&\2\u00e8\u00e5\3\2\2\2\u00e8\u00e6\3\2\2\2\u00e8\u00e7\3\2\2"+
+		"\2\u00e9F\3\2\2\2\u00ea\u00f0\7\'\2\2\u00eb\u00ec\7\62\2\2\u00ec\u00f0"+
+		"\7d\2\2\u00ed\u00ee\7\62\2\2\u00ee\u00f0\7D\2\2\u00ef\u00ea\3\2\2\2\u00ef"+
+		"\u00eb\3\2\2\2\u00ef\u00ed\3\2\2\2\u00f0\u00f4\3\2\2\2\u00f1\u00f3\5U"+
+		"+\2\u00f2\u00f1\3\2\2\2\u00f3\u00f6\3\2\2\2\u00f4\u00f2\3\2\2\2\u00f4"+
+		"\u00f5\3\2\2\2\u00f5\u00f7\3\2\2\2\u00f6\u00f4\3\2\2\2\u00f7\u00f9\7\60"+
+		"\2\2\u00f8\u00fa\5U+\2\u00f9\u00f8\3\2\2\2\u00fa\u00fb\3\2\2\2\u00fb\u00f9"+
+		"\3\2\2\2\u00fb\u00fc\3\2\2\2\u00fcH\3\2\2\2\u00fd\u00ff\5W,\2\u00fe\u00fd"+
+		"\3\2\2\2\u00ff\u0102\3\2\2\2\u0100\u00fe\3\2\2\2\u0100\u0101\3\2\2\2\u0101"+
+		"\u0103\3\2\2\2\u0102\u0100\3\2\2\2\u0103\u0105\7\60\2\2\u0104\u0106\5"+
+		"W,\2\u0105\u0104\3\2\2\2\u0106\u0107\3\2\2\2\u0107\u0105\3\2\2\2\u0107"+
+		"\u0108\3\2\2\2\u0108J\3\2\2\2\u0109\u010f\7&\2\2\u010a\u010b\7\62\2\2"+
+		"\u010b\u010f\7z\2\2\u010c\u010d\7\62\2\2\u010d\u010f\7Z\2\2\u010e\u0109"+
+		"\3\2\2\2\u010e\u010a\3\2\2\2\u010e\u010c\3\2\2\2\u010f\u0113\3\2\2\2\u0110"+
+		"\u0112\5Y-\2\u0111\u0110\3\2\2\2\u0112\u0115\3\2\2\2\u0113\u0111\3\2\2"+
+		"\2\u0113\u0114\3\2\2\2\u0114\u0116\3\2\2\2\u0115\u0113\3\2\2\2\u0116\u0118"+
+		"\7\60\2\2\u0117\u0119\5Y-\2\u0118\u0117\3\2\2\2\u0119\u011a\3\2\2\2\u011a"+
+		"\u0118\3\2\2\2\u011a\u011b\3\2\2\2\u011bL\3\2\2\2\u011c\u0120\5Q)\2\u011d"+
+		"\u0120\5S*\2\u011e\u0120\5O(\2\u011f\u011c\3\2\2\2\u011f\u011d\3\2\2\2"+
+		"\u011f\u011e\3\2\2\2\u0120N\3\2\2\2\u0121\u0122\7\62\2\2\u0122\u0124\t"+
+		"\3\2\2\u0123\u0125\5U+\2\u0124\u0123\3\2\2\2\u0125\u0126\3\2\2\2\u0126"+
+		"\u0124\3\2\2\2\u0126\u0127\3\2\2\2\u0127\u012f\3\2\2\2\u0128\u012a\7\'"+
+		"\2\2\u0129\u012b\5U+\2\u012a\u0129\3\2\2\2\u012b\u012c\3\2\2\2\u012c\u012a"+
+		"\3\2\2\2\u012c\u012d\3\2\2\2\u012d\u012f\3\2\2\2\u012e\u0121\3\2\2\2\u012e"+
+		"\u0128\3\2\2\2\u012fP\3\2\2\2\u0130\u0132\5W,\2\u0131\u0130\3\2\2\2\u0132"+
+		"\u0133\3\2\2\2\u0133\u0131\3\2\2\2\u0133\u0134\3\2\2\2\u0134R\3\2\2\2"+
+		"\u0135\u013b\7&\2\2\u0136\u0137\7\62\2\2\u0137\u013b\7z\2\2\u0138\u0139"+
+		"\7\62\2\2\u0139\u013b\7Z\2\2\u013a\u0135\3\2\2\2\u013a\u0136\3\2\2\2\u013a"+
+		"\u0138\3\2\2\2\u013b\u013d\3\2\2\2\u013c\u013e\5Y-\2\u013d\u013c\3\2\2"+
+		"\2\u013e\u013f\3\2\2\2\u013f\u013d\3\2\2\2\u013f\u0140\3\2\2\2\u0140T"+
+		"\3\2\2\2\u0141\u0142\t\4\2\2\u0142V\3\2\2\2\u0143\u0144\t\5\2\2\u0144"+
+		"X\3\2\2\2\u0145\u0146\t\6\2\2\u0146Z\3\2\2\2\u0147\u014b\5]/\2\u0148\u014a"+
+		"\5_\60\2\u0149\u0148\3\2\2\2\u014a\u014d\3\2\2\2\u014b\u0149\3\2\2\2\u014b"+
+		"\u014c\3\2\2\2\u014c\\\3\2\2\2\u014d\u014b\3\2\2\2\u014e\u014f\t\7\2\2"+
+		"\u014f^\3\2\2\2\u0150\u0151\t\b\2\2\u0151`\3\2\2\2\u0152\u0154\t\t\2\2"+
+		"\u0153\u0152\3\2\2\2\u0154\u0155\3\2\2\2\u0155\u0153\3\2\2\2\u0155\u0156"+
+		"\3\2\2\2\u0156\u0157\3\2\2\2\u0157\u0158\b\61\2\2\u0158b\3\2\2\2\32\2"+
+		"\u00c9\u00cf\u00d1\u00df\u00e3\u00e8\u00ef\u00f4\u00fb\u0100\u0107\u010e"+
+		"\u0113\u011a\u011f\u0126\u012c\u012e\u0133\u013a\u013f\u014b\u0155\3\b"+
 		"\2\2";
 	public static final ATN _ATN =
 		new ATNDeserializer().deserialize(_serializedATN.toCharArray());
diff --git a/src/dk/camelot64/kickc/parser/KickCLexer.tokens b/src/dk/camelot64/kickc/parser/KickCLexer.tokens
index 69c474e0f..fb63df5b8 100644
--- a/src/dk/camelot64/kickc/parser/KickCLexer.tokens
+++ b/src/dk/camelot64/kickc/parser/KickCLexer.tokens
@@ -26,20 +26,21 @@ T__24=25
 T__25=26
 T__26=27
 T__27=28
-TYPE=29
-STRING=30
-BOOLEAN=31
-NUMBER=32
-NUMFLOAT=33
-BINFLOAT=34
-DECFLOAT=35
-HEXFLOAT=36
-NUMINT=37
-BININTEGER=38
-DECINTEGER=39
-HEXINTEGER=40
-NAME=41
-WS=42
+T__28=29
+TYPE=30
+STRING=31
+BOOLEAN=32
+NUMBER=33
+NUMFLOAT=34
+BINFLOAT=35
+DECFLOAT=36
+HEXFLOAT=37
+NUMINT=38
+BININTEGER=39
+DECINTEGER=40
+HEXINTEGER=41
+NAME=42
+WS=43
 '{'=1
 '}'=2
 '='=3
@@ -49,22 +50,23 @@ WS=42
 ')'=7
 'else'=8
 'while'=9
-'+'=10
-'-'=11
-'not'=12
-'!'=13
-'*'=14
-'/'=15
-'=='=16
-'!='=17
-'<>'=18
-'<'=19
-'<='=20
-'=<'=21
-'>='=22
-'=>'=23
-'>'=24
-'and'=25
-'&&'=26
-'or'=27
-'||'=28
+'do'=10
+'+'=11
+'-'=12
+'not'=13
+'!'=14
+'*'=15
+'/'=16
+'=='=17
+'!='=18
+'<>'=19
+'<'=20
+'<='=21
+'=<'=22
+'>='=23
+'=>'=24
+'>'=25
+'and'=26
+'&&'=27
+'or'=28
+'||'=29
diff --git a/src/dk/camelot64/kickc/parser/KickCListener.java b/src/dk/camelot64/kickc/parser/KickCListener.java
index dfce0dcdd..7053c9c07 100644
--- a/src/dk/camelot64/kickc/parser/KickCListener.java
+++ b/src/dk/camelot64/kickc/parser/KickCListener.java
@@ -87,6 +87,18 @@ public interface KickCListener extends ParseTreeListener {
 	 * @param ctx the parse tree
 	 */
 	void exitStmtWhile(KickCParser.StmtWhileContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtDoWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtDoWhile(KickCParser.StmtDoWhileContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtDoWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtDoWhile(KickCParser.StmtDoWhileContext ctx);
 	/**
 	 * Enter a parse tree produced by the {@code exprBinary}
 	 * labeled alternative in {@link KickCParser#expr}.
diff --git a/src/dk/camelot64/kickc/parser/KickCParser.java b/src/dk/camelot64/kickc/parser/KickCParser.java
index 44744aa15..ed8b3e6d3 100644
--- a/src/dk/camelot64/kickc/parser/KickCParser.java
+++ b/src/dk/camelot64/kickc/parser/KickCParser.java
@@ -20,9 +20,9 @@ public class KickCParser extends Parser {
 		T__0=1, T__1=2, T__2=3, T__3=4, T__4=5, T__5=6, T__6=7, T__7=8, T__8=9, 
 		T__9=10, T__10=11, T__11=12, T__12=13, T__13=14, T__14=15, T__15=16, T__16=17, 
 		T__17=18, T__18=19, T__19=20, T__20=21, T__21=22, T__22=23, T__23=24, 
-		T__24=25, T__25=26, T__26=27, T__27=28, TYPE=29, STRING=30, BOOLEAN=31, 
-		NUMBER=32, NUMFLOAT=33, BINFLOAT=34, DECFLOAT=35, HEXFLOAT=36, NUMINT=37, 
-		BININTEGER=38, DECINTEGER=39, HEXINTEGER=40, NAME=41, WS=42;
+		T__24=25, T__25=26, T__26=27, T__27=28, T__28=29, TYPE=30, STRING=31, 
+		BOOLEAN=32, NUMBER=33, NUMFLOAT=34, BINFLOAT=35, DECFLOAT=36, HEXFLOAT=37, 
+		NUMINT=38, BININTEGER=39, DECINTEGER=40, HEXINTEGER=41, NAME=42, WS=43;
 	public static final int
 		RULE_file = 0, RULE_stmtSeq = 1, RULE_stmt = 2, RULE_expr = 3;
 	public static final String[] ruleNames = {
@@ -31,15 +31,16 @@ public class KickCParser extends Parser {
 
 	private static final String[] _LITERAL_NAMES = {
 		null, "'{'", "'}'", "'='", "';'", "'if'", "'('", "')'", "'else'", "'while'", 
-		"'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'=='", "'!='", "'<>'", "'<'", 
-		"'<='", "'=<'", "'>='", "'=>'", "'>'", "'and'", "'&&'", "'or'", "'||'"
+		"'do'", "'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'=='", "'!='", "'<>'", 
+		"'<'", "'<='", "'=<'", "'>='", "'=>'", "'>'", "'and'", "'&&'", "'or'", 
+		"'||'"
 	};
 	private static final String[] _SYMBOLIC_NAMES = {
 		null, null, null, null, null, null, null, null, null, null, null, null, 
 		null, null, null, null, null, null, null, null, null, null, null, null, 
-		null, null, null, null, null, "TYPE", "STRING", "BOOLEAN", "NUMBER", "NUMFLOAT", 
-		"BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", "DECINTEGER", 
-		"HEXINTEGER", "NAME", "WS"
+		null, null, null, null, null, null, "TYPE", "STRING", "BOOLEAN", "NUMBER", 
+		"NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", 
+		"DECINTEGER", "HEXINTEGER", "NAME", "WS"
 	};
 	public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -183,7 +184,7 @@ public class KickCParser extends Parser {
 				setState(14); 
 				_errHandler.sync(this);
 				_la = _input.LA(1);
-			} while ( (((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__0) | (1L << T__4) | (1L << T__5) | (1L << T__8) | (1L << T__9) | (1L << T__10) | (1L << T__11) | (1L << T__12) | (1L << TYPE) | (1L << STRING) | (1L << BOOLEAN) | (1L << NUMBER) | (1L << NAME))) != 0) );
+			} while ( (((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__0) | (1L << T__4) | (1L << T__5) | (1L << T__8) | (1L << T__9) | (1L << T__10) | (1L << T__11) | (1L << T__12) | (1L << T__13) | (1L << TYPE) | (1L << STRING) | (1L << BOOLEAN) | (1L << NUMBER) | (1L << NAME))) != 0) );
 			}
 		}
 		catch (RecognitionException re) {
@@ -268,6 +269,28 @@ public class KickCParser extends Parser {
 			else return visitor.visitChildren(this);
 		}
 	}
+	public static class StmtDoWhileContext extends StmtContext {
+		public StmtContext stmt() {
+			return getRuleContext(StmtContext.class,0);
+		}
+		public ExprContext expr() {
+			return getRuleContext(ExprContext.class,0);
+		}
+		public StmtDoWhileContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtDoWhile(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtDoWhile(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtDoWhile(this);
+			else return visitor.visitChildren(this);
+		}
+	}
 	public static class StmtAssignmentContext extends StmtContext {
 		public TerminalNode NAME() { return getToken(KickCParser.NAME, 0); }
 		public TerminalNode TYPE() { return getToken(KickCParser.TYPE, 0); }
@@ -320,7 +343,7 @@ public class KickCParser extends Parser {
 		enterRule(_localctx, 4, RULE_stmt);
 		int _la;
 		try {
-			setState(47);
+			setState(54);
 			_errHandler.sync(this);
 			switch ( getInterpreter().adaptivePredict(_input,4,_ctx) ) {
 			case 1:
@@ -421,6 +444,24 @@ public class KickCParser extends Parser {
 				stmt();
 				}
 				break;
+			case 6:
+				_localctx = new StmtDoWhileContext(_localctx);
+				enterOuterAlt(_localctx, 6);
+				{
+				setState(47);
+				match(T__9);
+				setState(48);
+				stmt();
+				setState(49);
+				match(T__8);
+				setState(50);
+				match(T__5);
+				setState(51);
+				expr(0);
+				setState(52);
+				match(T__6);
+				}
+				break;
 			}
 		}
 		catch (RecognitionException re) {
@@ -590,7 +631,7 @@ public class KickCParser extends Parser {
 			int _alt;
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(60);
+			setState(67);
 			_errHandler.sync(this);
 			switch (_input.LA(1)) {
 			case T__5:
@@ -599,25 +640,25 @@ public class KickCParser extends Parser {
 				_ctx = _localctx;
 				_prevctx = _localctx;
 
-				setState(50);
+				setState(57);
 				match(T__5);
-				setState(51);
+				setState(58);
 				expr(0);
-				setState(52);
+				setState(59);
 				match(T__6);
 				}
 				break;
-			case T__9:
 			case T__10:
 			case T__11:
 			case T__12:
+			case T__13:
 				{
 				_localctx = new ExprUnaryContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(54);
+				setState(61);
 				_la = _input.LA(1);
-				if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__9) | (1L << T__10) | (1L << T__11) | (1L << T__12))) != 0)) ) {
+				if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__10) | (1L << T__11) | (1L << T__12) | (1L << T__13))) != 0)) ) {
 				_errHandler.recoverInline(this);
 				}
 				else {
@@ -625,7 +666,7 @@ public class KickCParser extends Parser {
 					_errHandler.reportMatch(this);
 					consume();
 				}
-				setState(55);
+				setState(62);
 				expr(10);
 				}
 				break;
@@ -634,7 +675,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprIdContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(56);
+				setState(63);
 				match(NAME);
 				}
 				break;
@@ -643,7 +684,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprNumberContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(57);
+				setState(64);
 				match(NUMBER);
 				}
 				break;
@@ -652,7 +693,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprStringContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(58);
+				setState(65);
 				match(STRING);
 				}
 				break;
@@ -661,7 +702,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprBoolContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(59);
+				setState(66);
 				match(BOOLEAN);
 				}
 				break;
@@ -669,7 +710,7 @@ public class KickCParser extends Parser {
 				throw new NoViableAltException(this);
 			}
 			_ctx.stop = _input.LT(-1);
-			setState(79);
+			setState(86);
 			_errHandler.sync(this);
 			_alt = getInterpreter().adaptivePredict(_input,7,_ctx);
 			while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
@@ -677,18 +718,18 @@ public class KickCParser extends Parser {
 					if ( _parseListeners!=null ) triggerExitRuleEvent();
 					_prevctx = _localctx;
 					{
-					setState(77);
+					setState(84);
 					_errHandler.sync(this);
 					switch ( getInterpreter().adaptivePredict(_input,6,_ctx) ) {
 					case 1:
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(62);
+						setState(69);
 						if (!(precpred(_ctx, 9))) throw new FailedPredicateException(this, "precpred(_ctx, 9)");
-						setState(63);
+						setState(70);
 						_la = _input.LA(1);
-						if ( !(_la==T__13 || _la==T__14) ) {
+						if ( !(_la==T__14 || _la==T__15) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -696,7 +737,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(64);
+						setState(71);
 						expr(10);
 						}
 						break;
@@ -704,11 +745,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(65);
+						setState(72);
 						if (!(precpred(_ctx, 8))) throw new FailedPredicateException(this, "precpred(_ctx, 8)");
-						setState(66);
+						setState(73);
 						_la = _input.LA(1);
-						if ( !(_la==T__9 || _la==T__10) ) {
+						if ( !(_la==T__10 || _la==T__11) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -716,7 +757,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(67);
+						setState(74);
 						expr(9);
 						}
 						break;
@@ -724,11 +765,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(68);
+						setState(75);
 						if (!(precpred(_ctx, 7))) throw new FailedPredicateException(this, "precpred(_ctx, 7)");
-						setState(69);
+						setState(76);
 						_la = _input.LA(1);
-						if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__15) | (1L << T__16) | (1L << T__17) | (1L << T__18) | (1L << T__19) | (1L << T__20) | (1L << T__21) | (1L << T__22) | (1L << T__23))) != 0)) ) {
+						if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__16) | (1L << T__17) | (1L << T__18) | (1L << T__19) | (1L << T__20) | (1L << T__21) | (1L << T__22) | (1L << T__23) | (1L << T__24))) != 0)) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -736,7 +777,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(70);
+						setState(77);
 						expr(8);
 						}
 						break;
@@ -744,11 +785,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(71);
+						setState(78);
 						if (!(precpred(_ctx, 6))) throw new FailedPredicateException(this, "precpred(_ctx, 6)");
-						setState(72);
+						setState(79);
 						_la = _input.LA(1);
-						if ( !(_la==T__24 || _la==T__25) ) {
+						if ( !(_la==T__25 || _la==T__26) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -756,7 +797,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(73);
+						setState(80);
 						expr(7);
 						}
 						break;
@@ -764,11 +805,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(74);
+						setState(81);
 						if (!(precpred(_ctx, 5))) throw new FailedPredicateException(this, "precpred(_ctx, 5)");
-						setState(75);
+						setState(82);
 						_la = _input.LA(1);
-						if ( !(_la==T__26 || _la==T__27) ) {
+						if ( !(_la==T__27 || _la==T__28) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -776,14 +817,14 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(76);
+						setState(83);
 						expr(6);
 						}
 						break;
 					}
 					} 
 				}
-				setState(81);
+				setState(88);
 				_errHandler.sync(this);
 				_alt = getInterpreter().adaptivePredict(_input,7,_ctx);
 			}
@@ -824,30 +865,31 @@ public class KickCParser extends Parser {
 	}
 
 	public static final String _serializedATN =
-		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\3,U\4\2\t\2\4\3\t\3"+
-		"\4\4\t\4\4\5\t\5\3\2\3\2\3\2\3\3\6\3\17\n\3\r\3\16\3\20\3\4\3\4\3\4\3"+
-		"\4\3\4\5\4\30\n\4\3\4\3\4\3\4\5\4\35\n\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\3"+
-		"\4\3\4\3\4\3\4\5\4*\n\4\3\4\3\4\3\4\3\4\3\4\3\4\5\4\62\n\4\3\5\3\5\3\5"+
-		"\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\5\5?\n\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5"+
-		"\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\7\5P\n\5\f\5\16\5S\13\5\3\5\2\3\b\6\2"+
-		"\4\6\b\2\b\3\2\f\17\3\2\20\21\3\2\f\r\3\2\22\32\3\2\33\34\3\2\35\36\2"+
-		"b\2\n\3\2\2\2\4\16\3\2\2\2\6\61\3\2\2\2\b>\3\2\2\2\n\13\5\4\3\2\13\f\7"+
-		"\2\2\3\f\3\3\2\2\2\r\17\5\6\4\2\16\r\3\2\2\2\17\20\3\2\2\2\20\16\3\2\2"+
-		"\2\20\21\3\2\2\2\21\5\3\2\2\2\22\23\7\3\2\2\23\24\5\4\3\2\24\25\7\4\2"+
-		"\2\25\62\3\2\2\2\26\30\7\37\2\2\27\26\3\2\2\2\27\30\3\2\2\2\30\31\3\2"+
-		"\2\2\31\34\7+\2\2\32\33\7\5\2\2\33\35\5\b\5\2\34\32\3\2\2\2\34\35\3\2"+
-		"\2\2\35\36\3\2\2\2\36\62\7\6\2\2\37 \5\b\5\2 !\7\6\2\2!\62\3\2\2\2\"#"+
-		"\7\7\2\2#$\7\b\2\2$%\5\b\5\2%&\7\t\2\2&)\5\6\4\2\'(\7\n\2\2(*\5\6\4\2"+
-		")\'\3\2\2\2)*\3\2\2\2*\62\3\2\2\2+,\7\13\2\2,-\7\b\2\2-.\5\b\5\2./\7\t"+
-		"\2\2/\60\5\6\4\2\60\62\3\2\2\2\61\22\3\2\2\2\61\27\3\2\2\2\61\37\3\2\2"+
-		"\2\61\"\3\2\2\2\61+\3\2\2\2\62\7\3\2\2\2\63\64\b\5\1\2\64\65\7\b\2\2\65"+
-		"\66\5\b\5\2\66\67\7\t\2\2\67?\3\2\2\289\t\2\2\29?\5\b\5\f:?\7+\2\2;?\7"+
-		"\"\2\2<?\7 \2\2=?\7!\2\2>\63\3\2\2\2>8\3\2\2\2>:\3\2\2\2>;\3\2\2\2><\3"+
-		"\2\2\2>=\3\2\2\2?Q\3\2\2\2@A\f\13\2\2AB\t\3\2\2BP\5\b\5\fCD\f\n\2\2DE"+
-		"\t\4\2\2EP\5\b\5\13FG\f\t\2\2GH\t\5\2\2HP\5\b\5\nIJ\f\b\2\2JK\t\6\2\2"+
-		"KP\5\b\5\tLM\f\7\2\2MN\t\7\2\2NP\5\b\5\bO@\3\2\2\2OC\3\2\2\2OF\3\2\2\2"+
-		"OI\3\2\2\2OL\3\2\2\2PS\3\2\2\2QO\3\2\2\2QR\3\2\2\2R\t\3\2\2\2SQ\3\2\2"+
-		"\2\n\20\27\34)\61>OQ";
+		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\3-\\\4\2\t\2\4\3\t"+
+		"\3\4\4\t\4\4\5\t\5\3\2\3\2\3\2\3\3\6\3\17\n\3\r\3\16\3\20\3\4\3\4\3\4"+
+		"\3\4\3\4\5\4\30\n\4\3\4\3\4\3\4\5\4\35\n\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4"+
+		"\3\4\3\4\3\4\3\4\5\4*\n\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4\3\4"+
+		"\3\4\3\4\5\49\n\4\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\5\5F\n\5"+
+		"\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\3\5\7\5W\n\5"+
+		"\f\5\16\5Z\13\5\3\5\2\3\b\6\2\4\6\b\2\b\3\2\r\20\3\2\21\22\3\2\r\16\3"+
+		"\2\23\33\3\2\34\35\3\2\36\37\2j\2\n\3\2\2\2\4\16\3\2\2\2\68\3\2\2\2\b"+
+		"E\3\2\2\2\n\13\5\4\3\2\13\f\7\2\2\3\f\3\3\2\2\2\r\17\5\6\4\2\16\r\3\2"+
+		"\2\2\17\20\3\2\2\2\20\16\3\2\2\2\20\21\3\2\2\2\21\5\3\2\2\2\22\23\7\3"+
+		"\2\2\23\24\5\4\3\2\24\25\7\4\2\2\259\3\2\2\2\26\30\7 \2\2\27\26\3\2\2"+
+		"\2\27\30\3\2\2\2\30\31\3\2\2\2\31\34\7,\2\2\32\33\7\5\2\2\33\35\5\b\5"+
+		"\2\34\32\3\2\2\2\34\35\3\2\2\2\35\36\3\2\2\2\369\7\6\2\2\37 \5\b\5\2 "+
+		"!\7\6\2\2!9\3\2\2\2\"#\7\7\2\2#$\7\b\2\2$%\5\b\5\2%&\7\t\2\2&)\5\6\4\2"+
+		"\'(\7\n\2\2(*\5\6\4\2)\'\3\2\2\2)*\3\2\2\2*9\3\2\2\2+,\7\13\2\2,-\7\b"+
+		"\2\2-.\5\b\5\2./\7\t\2\2/\60\5\6\4\2\609\3\2\2\2\61\62\7\f\2\2\62\63\5"+
+		"\6\4\2\63\64\7\13\2\2\64\65\7\b\2\2\65\66\5\b\5\2\66\67\7\t\2\2\679\3"+
+		"\2\2\28\22\3\2\2\28\27\3\2\2\28\37\3\2\2\28\"\3\2\2\28+\3\2\2\28\61\3"+
+		"\2\2\29\7\3\2\2\2:;\b\5\1\2;<\7\b\2\2<=\5\b\5\2=>\7\t\2\2>F\3\2\2\2?@"+
+		"\t\2\2\2@F\5\b\5\fAF\7,\2\2BF\7#\2\2CF\7!\2\2DF\7\"\2\2E:\3\2\2\2E?\3"+
+		"\2\2\2EA\3\2\2\2EB\3\2\2\2EC\3\2\2\2ED\3\2\2\2FX\3\2\2\2GH\f\13\2\2HI"+
+		"\t\3\2\2IW\5\b\5\fJK\f\n\2\2KL\t\4\2\2LW\5\b\5\13MN\f\t\2\2NO\t\5\2\2"+
+		"OW\5\b\5\nPQ\f\b\2\2QR\t\6\2\2RW\5\b\5\tST\f\7\2\2TU\t\7\2\2UW\5\b\5\b"+
+		"VG\3\2\2\2VJ\3\2\2\2VM\3\2\2\2VP\3\2\2\2VS\3\2\2\2WZ\3\2\2\2XV\3\2\2\2"+
+		"XY\3\2\2\2Y\t\3\2\2\2ZX\3\2\2\2\n\20\27\34)8EVX";
 	public static final ATN _ATN =
 		new ATNDeserializer().deserialize(_serializedATN.toCharArray());
 	static {
diff --git a/src/dk/camelot64/kickc/parser/KickCVisitor.java b/src/dk/camelot64/kickc/parser/KickCVisitor.java
index ccafef85a..c82e30341 100644
--- a/src/dk/camelot64/kickc/parser/KickCVisitor.java
+++ b/src/dk/camelot64/kickc/parser/KickCVisitor.java
@@ -57,6 +57,13 @@ public interface KickCVisitor<T> extends ParseTreeVisitor<T> {
 	 * @return the visitor result
 	 */
 	T visitStmtWhile(KickCParser.StmtWhileContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtDoWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtDoWhile(KickCParser.StmtDoWhileContext ctx);
 	/**
 	 * Visit a parse tree produced by the {@code exprBinary}
 	 * labeled alternative in {@link KickCParser#expr}.
diff --git a/src/dk/camelot64/kickc/test/Main.java b/src/dk/camelot64/kickc/test/Main.java
index ca5ca6842..68c01db5b 100644
--- a/src/dk/camelot64/kickc/test/Main.java
+++ b/src/dk/camelot64/kickc/test/Main.java
@@ -4,9 +4,7 @@ import dk.camelot64.kickc.asm.AsmProgram;
 import dk.camelot64.kickc.icl.*;
 import dk.camelot64.kickc.parser.KickCLexer;
 import dk.camelot64.kickc.parser.KickCParser;
-import org.antlr.v4.runtime.CharStream;
-import org.antlr.v4.runtime.CharStreams;
-import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.*;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -15,11 +13,18 @@ import java.util.List;
 /** Test my KickC Grammar */
 public class Main {
    public static void main(String[] args) throws IOException {
-      CharStream input = CharStreams.fromFileName("src/dk/camelot64/kickc/test/fib.kc");
+      final String fileName = "src/dk/camelot64/kickc/test/fib2.kc";
+      final CharStream input = CharStreams.fromFileName(fileName);
       System.out.println(input.toString());
       KickCLexer lexer = new KickCLexer(input);
       KickCParser parser = new KickCParser(new CommonTokenStream(lexer));
       parser.setBuildParseTree(true);
+      parser.addErrorListener(new BaseErrorListener() {
+         @Override
+         public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
+            throw new RuntimeException("Error parsing  file "+fileName+"\n - Line: "+line+"\n - Message: "+msg);
+         }
+      });
       KickCParser.FileContext file = parser.file();
       Pass1GenerateStatementSequence pass1GenerateStatementSequence = new Pass1GenerateStatementSequence();
       pass1GenerateStatementSequence.generate(file);
diff --git a/src/dk/camelot64/kickc/test/fib2.kc b/src/dk/camelot64/kickc/test/fib2.kc
new file mode 100644
index 000000000..2059e8cc5
--- /dev/null
+++ b/src/dk/camelot64/kickc/test/fib2.kc
@@ -0,0 +1,10 @@
+byte n1 = 0;
+byte n2 = 1;
+byte i = 12;
+byte fib = 0;
+do {
+    fib = n1 + n2;
+    n1 = n2;
+    n2 = fib;
+    i = i - 1;
+} while(i!=0)