From a06fe6e9891e8603a1c1b0ff6491e8d3ada5e32c Mon Sep 17 00:00:00 2001
From: jespergravgaard <jesper@balmangravgaard.dk>
Date: Sun, 7 May 2017 11:58:54 +0200
Subject: [PATCH] Parsing, 3 Address Code, Type Inference

---
 src/dk/camelot64/kickc/parser/KickC.g4        |  22 +-
 src/dk/camelot64/kickc/parser/KickC.tokens    |  83 +--
 .../kickc/parser/KickCBaseListener.java       |  84 +++
 .../kickc/parser/KickCBaseVisitor.java        |  49 ++
 src/dk/camelot64/kickc/parser/KickCLexer.java | 232 ++++----
 .../camelot64/kickc/parser/KickCLexer.tokens  |  83 +--
 .../camelot64/kickc/parser/KickCListener.java |  80 +++
 .../camelot64/kickc/parser/KickCParser.java   | 499 +++++++++++++++---
 .../camelot64/kickc/parser/KickCVisitor.java  |  47 ++
 src/dk/camelot64/kickc/ssa/GenerateSSA.java   | 155 ++++--
 .../kickc/ssa/PassTypeInference.java          |  84 +++
 src/dk/camelot64/kickc/ssa/SSABasicBlock.java |  24 +-
 .../kickc/ssa/SSAConstantInteger.java         |   4 +
 src/dk/camelot64/kickc/ssa/SSAJumpLabel.java  |  16 +
 src/dk/camelot64/kickc/ssa/SSAOperator.java   |   4 +
 src/dk/camelot64/kickc/ssa/SSASequence.java   |  33 ++
 src/dk/camelot64/kickc/ssa/SSAStatement.java  |  44 +-
 .../kickc/ssa/SSAStatementAssignment.java     |  66 +++
 .../ssa/SSAStatementConditionalJump.java      |  31 ++
 .../camelot64/kickc/ssa/SSAStatementJump.java |  25 +
 .../kickc/ssa/SSAStatementJumpTarget.java     |  24 +
 src/dk/camelot64/kickc/ssa/SSAVariable.java   |  17 +-
 .../kickc/ssa/SSAVariableManager.java         |  12 -
 src/dk/camelot64/kickc/ssa/Symbol.java        |  43 ++
 src/dk/camelot64/kickc/ssa/SymbolManager.java |  68 +++
 src/dk/camelot64/kickc/ssa/SymbolType.java    |  33 ++
 src/dk/camelot64/kickc/test/main.java         |  17 +-
 src/dk/camelot64/kickc/test/test.kc           |   8 +-
 28 files changed, 1543 insertions(+), 344 deletions(-)
 create mode 100644 src/dk/camelot64/kickc/ssa/PassTypeInference.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSAJumpLabel.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSASequence.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSAStatementAssignment.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSAStatementConditionalJump.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSAStatementJump.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SSAStatementJumpTarget.java
 delete mode 100644 src/dk/camelot64/kickc/ssa/SSAVariableManager.java
 create mode 100644 src/dk/camelot64/kickc/ssa/Symbol.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SymbolManager.java
 create mode 100644 src/dk/camelot64/kickc/ssa/SymbolType.java

diff --git a/src/dk/camelot64/kickc/parser/KickC.g4 b/src/dk/camelot64/kickc/parser/KickC.g4
index aace994d0..791e091e2 100644
--- a/src/dk/camelot64/kickc/parser/KickC.g4
+++ b/src/dk/camelot64/kickc/parser/KickC.g4
@@ -1,11 +1,29 @@
 // KickC grammar
 grammar KickC;
+
+file :
+    stmtSeq EOF
+    ;
+
+stmtSeq
+    : stmt+
+    ;
+
+stmt
+    : '{' stmtSeq '}' #stmtBlock
+    | (TYPE)? NAME ('=' expr)? ';' #stmtAssignment
+    | expr  ';' #stmtExpr
+    | 'if' '(' expr ')' stmt ( 'else' stmt )? #stmtIfElse
+    | 'while' '(' expr ')' stmt  #stmtWhile
+    ;
+
+
 expr
     : '(' expr ')' #exprPar
     | ('+' | '-' | 'not' | '!') expr #exprUnary
     | expr ('*' | '/' ) expr #exprBinary
     | expr ( '+' | '-')  expr #exprBinary
-    | expr ( '=' | '==' | '!=' | '<>' | '<' | '<=' | '=<' | '>=' | '=>' | '>' ) expr #exprBinary
+    | expr ( '==' | '!=' | '<>' | '<' | '<=' | '=<' | '>=' | '=>' | '>' ) expr #exprBinary
     | expr ( 'and' | '&&' )  expr #exprBinary
     | expr ( 'or' | '||' )  expr #exprBinary
     | NAME #exprId
@@ -13,6 +31,8 @@ expr
     | STRING #exprString
     | BOOLEAN #exprBool
     ;
+
+TYPE: 'byte' | 'word' | 'string' | 'boolean';
 STRING : '"' ('\\"' | ~'"')* '"';
 BOOLEAN : 'true' | 'false';
 NUMBER : NUMFLOAT | NUMINT ;
diff --git a/src/dk/camelot64/kickc/parser/KickC.tokens b/src/dk/camelot64/kickc/parser/KickC.tokens
index e5f7b36dd..69c474e0f 100644
--- a/src/dk/camelot64/kickc/parser/KickC.tokens
+++ b/src/dk/camelot64/kickc/parser/KickC.tokens
@@ -20,38 +20,51 @@ T__18=19
 T__19=20
 T__20=21
 T__21=22
-STRING=23
-BOOLEAN=24
-NUMBER=25
-NUMFLOAT=26
-BINFLOAT=27
-DECFLOAT=28
-HEXFLOAT=29
-NUMINT=30
-BININTEGER=31
-DECINTEGER=32
-HEXINTEGER=33
-NAME=34
-WS=35
-'('=1
-')'=2
-'+'=3
-'-'=4
-'not'=5
-'!'=6
-'*'=7
-'/'=8
-'='=9
-'=='=10
-'!='=11
-'<>'=12
-'<'=13
-'<='=14
-'=<'=15
-'>='=16
-'=>'=17
-'>'=18
-'and'=19
-'&&'=20
-'or'=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
+'{'=1
+'}'=2
+'='=3
+';'=4
+'if'=5
+'('=6
+')'=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
diff --git a/src/dk/camelot64/kickc/parser/KickCBaseListener.java b/src/dk/camelot64/kickc/parser/KickCBaseListener.java
index 532199b9f..dd59af9bd 100644
--- a/src/dk/camelot64/kickc/parser/KickCBaseListener.java
+++ b/src/dk/camelot64/kickc/parser/KickCBaseListener.java
@@ -11,6 +11,90 @@ import org.antlr.v4.runtime.tree.TerminalNode;
  * of the available methods.
  */
 public class KickCBaseListener implements KickCListener {
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterFile(KickCParser.FileContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitFile(KickCParser.FileContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtSeq(KickCParser.StmtSeqContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtSeq(KickCParser.StmtSeqContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtBlock(KickCParser.StmtBlockContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtBlock(KickCParser.StmtBlockContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtAssignment(KickCParser.StmtAssignmentContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtAssignment(KickCParser.StmtAssignmentContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtExpr(KickCParser.StmtExprContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtExpr(KickCParser.StmtExprContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtIfElse(KickCParser.StmtIfElseContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtIfElse(KickCParser.StmtIfElseContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void enterStmtWhile(KickCParser.StmtWhileContext ctx) { }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation does nothing.</p>
+	 */
+	@Override public void exitStmtWhile(KickCParser.StmtWhileContext ctx) { }
 	/**
 	 * {@inheritDoc}
 	 *
diff --git a/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java b/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
index 808e94c75..01e0a560f 100644
--- a/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
+++ b/src/dk/camelot64/kickc/parser/KickCBaseVisitor.java
@@ -11,6 +11,55 @@ import org.antlr.v4.runtime.tree.AbstractParseTreeVisitor;
  * operations with no return type.
  */
 public class KickCBaseVisitor<T> extends AbstractParseTreeVisitor<T> implements KickCVisitor<T> {
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitFile(KickCParser.FileContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtSeq(KickCParser.StmtSeqContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtBlock(KickCParser.StmtBlockContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtAssignment(KickCParser.StmtAssignmentContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtExpr(KickCParser.StmtExprContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtIfElse(KickCParser.StmtIfElseContext ctx) { return visitChildren(ctx); }
+	/**
+	 * {@inheritDoc}
+	 *
+	 * <p>The default implementation returns the result of calling
+	 * {@link #visitChildren} on {@code ctx}.</p>
+	 */
+	@Override public T visitStmtWhile(KickCParser.StmtWhileContext ctx) { return visitChildren(ctx); }
 	/**
 	 * {@inheritDoc}
 	 *
diff --git a/src/dk/camelot64/kickc/parser/KickCLexer.java b/src/dk/camelot64/kickc/parser/KickCLexer.java
index f29fae49a..57d8252cc 100644
--- a/src/dk/camelot64/kickc/parser/KickCLexer.java
+++ b/src/dk/camelot64/kickc/parser/KickCLexer.java
@@ -19,9 +19,10 @@ public class KickCLexer extends Lexer {
 	public static final int
 		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, STRING=23, BOOLEAN=24, 
-		NUMBER=25, NUMFLOAT=26, BINFLOAT=27, DECFLOAT=28, HEXFLOAT=29, NUMINT=30, 
-		BININTEGER=31, DECINTEGER=32, HEXINTEGER=33, NAME=34, WS=35;
+		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;
 	public static String[] channelNames = {
 		"DEFAULT_TOKEN_CHANNEL", "HIDDEN"
 	};
@@ -33,22 +34,24 @@ public class KickCLexer extends Lexer {
 	public static final String[] ruleNames = {
 		"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", "STRING", "BOOLEAN", "NUMBER", 
-		"NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", "BININTEGER", 
-		"DECINTEGER", "HEXINTEGER", "BINDIGIT", "DECDIGIT", "HEXDIGIT", "NAME", 
-		"NAME_START", "NAME_CHAR", "WS"
+		"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"
 	};
 
 	private static final String[] _LITERAL_NAMES = {
-		null, "'('", "')'", "'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'='", 
-		"'=='", "'!='", "'<>'", "'<'", "'<='", "'=<'", "'>='", "'=>'", "'>'", 
-		"'and'", "'&&'", "'or'", "'||'"
+		null, "'{'", "'}'", "'='", "';'", "'if'", "'('", "')'", "'else'", "'while'", 
+		"'+'", "'-'", "'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, "STRING", 
-		"BOOLEAN", "NUMBER", "NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", 
-		"BININTEGER", "DECINTEGER", "HEXINTEGER", "NAME", "WS"
+		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"
 	};
 	public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -108,103 +111,122 @@ 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%\u011b\b\1\4\2\t"+
+		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\2,\u0154\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)\3\2\3\2\3\3\3"+
-		"\3\3\4\3\4\3\5\3\5\3\6\3\6\3\6\3\6\3\7\3\7\3\b\3\b\3\t\3\t\3\n\3\n\3\13"+
-		"\3\13\3\13\3\f\3\f\3\f\3\r\3\r\3\r\3\16\3\16\3\17\3\17\3\17\3\20\3\20"+
-		"\3\20\3\21\3\21\3\21\3\22\3\22\3\22\3\23\3\23\3\24\3\24\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\30\7\30\u0092"+
-		"\n\30\f\30\16\30\u0095\13\30\3\30\3\30\3\31\3\31\3\31\3\31\3\31\3\31\3"+
-		"\31\3\31\3\31\5\31\u00a2\n\31\3\32\3\32\5\32\u00a6\n\32\3\33\3\33\3\33"+
-		"\5\33\u00ab\n\33\3\34\3\34\3\34\3\34\3\34\5\34\u00b2\n\34\3\34\7\34\u00b5"+
-		"\n\34\f\34\16\34\u00b8\13\34\3\34\3\34\6\34\u00bc\n\34\r\34\16\34\u00bd"+
-		"\3\35\7\35\u00c1\n\35\f\35\16\35\u00c4\13\35\3\35\3\35\6\35\u00c8\n\35"+
-		"\r\35\16\35\u00c9\3\36\3\36\3\36\3\36\3\36\5\36\u00d1\n\36\3\36\7\36\u00d4"+
-		"\n\36\f\36\16\36\u00d7\13\36\3\36\3\36\6\36\u00db\n\36\r\36\16\36\u00dc"+
-		"\3\37\3\37\3\37\5\37\u00e2\n\37\3 \3 \3 \6 \u00e7\n \r \16 \u00e8\3 \3"+
-		" \6 \u00ed\n \r \16 \u00ee\5 \u00f1\n \3!\6!\u00f4\n!\r!\16!\u00f5\3\""+
-		"\3\"\3\"\3\"\3\"\5\"\u00fd\n\"\3\"\6\"\u0100\n\"\r\"\16\"\u0101\3#\3#"+
-		"\3$\3$\3%\3%\3&\3&\7&\u010c\n&\f&\16&\u010f\13&\3\'\3\'\3(\3(\3)\6)\u0116"+
-		"\n)\r)\16)\u0117\3)\3)\2\2*\3\3\5\4\7\5\t\6\13\7\r\b\17\t\21\n\23\13\25"+
+		"\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"+
+		"\3\33\3\33\3\34\3\34\3\34\3\35\3\35\3\35\3\36\3\36\3\36\3\36\3\36\3\36"+
+		"\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36\3\36"+
+		"\3\36\5\36\u00c5\n\36\3\37\3\37\3\37\3\37\7\37\u00cb\n\37\f\37\16\37\u00ce"+
+		"\13\37\3\37\3\37\3 \3 \3 \3 \3 \3 \3 \3 \3 \5 \u00db\n \3!\3!\5!\u00df"+
+		"\n!\3\"\3\"\3\"\5\"\u00e4\n\"\3#\3#\3#\3#\3#\5#\u00eb\n#\3#\7#\u00ee\n"+
+		"#\f#\16#\u00f1\13#\3#\3#\6#\u00f5\n#\r#\16#\u00f6\3$\7$\u00fa\n$\f$\16"+
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+		"\7p\2\2\u00bc\u00c5\7i\2\2\u00bd\u00be\7d\2\2\u00be\u00bf\7q\2\2\u00bf"+
+		"\u00c0\7q\2\2\u00c0\u00c1\7n\2\2\u00c1\u00c2\7g\2\2\u00c2\u00c3\7c\2\2"+
+		"\u00c3\u00c5\7p\2\2\u00c4\u00af\3\2\2\2\u00c4\u00b3\3\2\2\2\u00c4\u00b7"+
+		"\3\2\2\2\u00c4\u00bd\3\2\2\2\u00c5<\3\2\2\2\u00c6\u00cc\7$\2\2\u00c7\u00c8"+
+		"\7^\2\2\u00c8\u00cb\7$\2\2\u00c9\u00cb\n\2\2\2\u00ca\u00c7\3\2\2\2\u00ca"+
+		"\u00c9\3\2\2\2\u00cb\u00ce\3\2\2\2\u00cc\u00ca\3\2\2\2\u00cc\u00cd\3\2"+
+		"\2\2\u00cd\u00cf\3\2\2\2\u00ce\u00cc\3\2\2\2\u00cf\u00d0\7$\2\2\u00d0"+
+		">\3\2\2\2\u00d1\u00d2\7v\2\2\u00d2\u00d3\7t\2\2\u00d3\u00d4\7w\2\2\u00d4"+
+		"\u00db\7g\2\2\u00d5\u00d6\7h\2\2\u00d6\u00d7\7c\2\2\u00d7\u00d8\7n\2\2"+
+		"\u00d8\u00d9\7u\2\2\u00d9\u00db\7g\2\2\u00da\u00d1\3\2\2\2\u00da\u00d5"+
+		"\3\2\2\2\u00db@\3\2\2\2\u00dc\u00df\5C\"\2\u00dd\u00df\5K&\2\u00de\u00dc"+
+		"\3\2\2\2\u00de\u00dd\3\2\2\2\u00dfB\3\2\2\2\u00e0\u00e4\5E#\2\u00e1\u00e4"+
+		"\5G$\2\u00e2\u00e4\5I%\2\u00e3\u00e0\3\2\2\2\u00e3\u00e1\3\2\2\2\u00e3"+
+		"\u00e2\3\2\2\2\u00e4D\3\2\2\2\u00e5\u00eb\7\'\2\2\u00e6\u00e7\7\62\2\2"+
+		"\u00e7\u00eb\7d\2\2\u00e8\u00e9\7\62\2\2\u00e9\u00eb\7D\2\2\u00ea\u00e5"+
+		"\3\2\2\2\u00ea\u00e6\3\2\2\2\u00ea\u00e8\3\2\2\2\u00eb\u00ef\3\2\2\2\u00ec"+
+		"\u00ee\5S*\2\u00ed\u00ec\3\2\2\2\u00ee\u00f1\3\2\2\2\u00ef\u00ed\3\2\2"+
+		"\2\u00ef\u00f0\3\2\2\2\u00f0\u00f2\3\2\2\2\u00f1\u00ef\3\2\2\2\u00f2\u00f4"+
+		"\7\60\2\2\u00f3\u00f5\5S*\2\u00f4\u00f3\3\2\2\2\u00f5\u00f6\3\2\2\2\u00f6"+
+		"\u00f4\3\2\2\2\u00f6\u00f7\3\2\2\2\u00f7F\3\2\2\2\u00f8\u00fa\5U+\2\u00f9"+
+		"\u00f8\3\2\2\2\u00fa\u00fd\3\2\2\2\u00fb\u00f9\3\2\2\2\u00fb\u00fc\3\2"+
+		"\2\2\u00fc\u00fe\3\2\2\2\u00fd\u00fb\3\2\2\2\u00fe\u0100\7\60\2\2\u00ff"+
+		"\u0101\5U+\2\u0100\u00ff\3\2\2\2\u0101\u0102\3\2\2\2\u0102\u0100\3\2\2"+
+		"\2\u0102\u0103\3\2\2\2\u0103H\3\2\2\2\u0104\u010a\7&\2\2\u0105\u0106\7"+
+		"\62\2\2\u0106\u010a\7z\2\2\u0107\u0108\7\62\2\2\u0108\u010a\7Z\2\2\u0109"+
+		"\u0104\3\2\2\2\u0109\u0105\3\2\2\2\u0109\u0107\3\2\2\2\u010a\u010e\3\2"+
+		"\2\2\u010b\u010d\5W,\2\u010c\u010b\3\2\2\2\u010d\u0110\3\2\2\2\u010e\u010c"+
+		"\3\2\2\2\u010e\u010f\3\2\2\2\u010f\u0111\3\2\2\2\u0110\u010e\3\2\2\2\u0111"+
+		"\u0113\7\60\2\2\u0112\u0114\5W,\2\u0113\u0112\3\2\2\2\u0114\u0115\3\2"+
+		"\2\2\u0115\u0113\3\2\2\2\u0115\u0116\3\2\2\2\u0116J\3\2\2\2\u0117\u011b"+
+		"\5O(\2\u0118\u011b\5Q)\2\u0119\u011b\5M\'\2\u011a\u0117\3\2\2\2\u011a"+
+		"\u0118\3\2\2\2\u011a\u0119\3\2\2\2\u011bL\3\2\2\2\u011c\u011d\7\62\2\2"+
+		"\u011d\u011f\t\3\2\2\u011e\u0120\5S*\2\u011f\u011e\3\2\2\2\u0120\u0121"+
+		"\3\2\2\2\u0121\u011f\3\2\2\2\u0121\u0122\3\2\2\2\u0122\u012a\3\2\2\2\u0123"+
+		"\u0125\7\'\2\2\u0124\u0126\5S*\2\u0125\u0124\3\2\2\2\u0126\u0127\3\2\2"+
+		"\2\u0127\u0125\3\2\2\2\u0127\u0128\3\2\2\2\u0128\u012a\3\2\2\2\u0129\u011c"+
+		"\3\2\2\2\u0129\u0123\3\2\2\2\u012aN\3\2\2\2\u012b\u012d\5U+\2\u012c\u012b"+
+		"\3\2\2\2\u012d\u012e\3\2\2\2\u012e\u012c\3\2\2\2\u012e\u012f\3\2\2\2\u012f"+
+		"P\3\2\2\2\u0130\u0136\7&\2\2\u0131\u0132\7\62\2\2\u0132\u0136\7z\2\2\u0133"+
+		"\u0134\7\62\2\2\u0134\u0136\7Z\2\2\u0135\u0130\3\2\2\2\u0135\u0131\3\2"+
+		"\2\2\u0135\u0133\3\2\2\2\u0136\u0138\3\2\2\2\u0137\u0139\5W,\2\u0138\u0137"+
+		"\3\2\2\2\u0139\u013a\3\2\2\2\u013a\u0138\3\2\2\2\u013a\u013b\3\2\2\2\u013b"+
+		"R\3\2\2\2\u013c\u013d\t\4\2\2\u013dT\3\2\2\2\u013e\u013f\t\5\2\2\u013f"+
+		"V\3\2\2\2\u0140\u0141\t\6\2\2\u0141X\3\2\2\2\u0142\u0146\5[.\2\u0143\u0145"+
+		"\5]/\2\u0144\u0143\3\2\2\2\u0145\u0148\3\2\2\2\u0146\u0144\3\2\2\2\u0146"+
+		"\u0147\3\2\2\2\u0147Z\3\2\2\2\u0148\u0146\3\2\2\2\u0149\u014a\t\7\2\2"+
+		"\u014a\\\3\2\2\2\u014b\u014c\t\b\2\2\u014c^\3\2\2\2\u014d\u014f\t\t\2"+
+		"\2\u014e\u014d\3\2\2\2\u014f\u0150\3\2\2\2\u0150\u014e\3\2\2\2\u0150\u0151"+
+		"\3\2\2\2\u0151\u0152\3\2\2\2\u0152\u0153\b\60\2\2\u0153`\3\2\2\2\32\2"+
+		"\u00c4\u00ca\u00cc\u00da\u00de\u00e3\u00ea\u00ef\u00f6\u00fb\u0102\u0109"+
+		"\u010e\u0115\u011a\u0121\u0127\u0129\u012e\u0135\u013a\u0146\u0150\3\b"+
+		"\2\2";
 	public static final ATN _ATN =
 		new ATNDeserializer().deserialize(_serializedATN.toCharArray());
 	static {
diff --git a/src/dk/camelot64/kickc/parser/KickCLexer.tokens b/src/dk/camelot64/kickc/parser/KickCLexer.tokens
index e5f7b36dd..69c474e0f 100644
--- a/src/dk/camelot64/kickc/parser/KickCLexer.tokens
+++ b/src/dk/camelot64/kickc/parser/KickCLexer.tokens
@@ -20,38 +20,51 @@ T__18=19
 T__19=20
 T__20=21
 T__21=22
-STRING=23
-BOOLEAN=24
-NUMBER=25
-NUMFLOAT=26
-BINFLOAT=27
-DECFLOAT=28
-HEXFLOAT=29
-NUMINT=30
-BININTEGER=31
-DECINTEGER=32
-HEXINTEGER=33
-NAME=34
-WS=35
-'('=1
-')'=2
-'+'=3
-'-'=4
-'not'=5
-'!'=6
-'*'=7
-'/'=8
-'='=9
-'=='=10
-'!='=11
-'<>'=12
-'<'=13
-'<='=14
-'=<'=15
-'>='=16
-'=>'=17
-'>'=18
-'and'=19
-'&&'=20
-'or'=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
+'{'=1
+'}'=2
+'='=3
+';'=4
+'if'=5
+'('=6
+')'=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
diff --git a/src/dk/camelot64/kickc/parser/KickCListener.java b/src/dk/camelot64/kickc/parser/KickCListener.java
index 6c8223fd9..dfce0dcdd 100644
--- a/src/dk/camelot64/kickc/parser/KickCListener.java
+++ b/src/dk/camelot64/kickc/parser/KickCListener.java
@@ -7,6 +7,86 @@ import org.antlr.v4.runtime.tree.ParseTreeListener;
  * {@link KickCParser}.
  */
 public interface KickCListener extends ParseTreeListener {
+	/**
+	 * Enter a parse tree produced by {@link KickCParser#file}.
+	 * @param ctx the parse tree
+	 */
+	void enterFile(KickCParser.FileContext ctx);
+	/**
+	 * Exit a parse tree produced by {@link KickCParser#file}.
+	 * @param ctx the parse tree
+	 */
+	void exitFile(KickCParser.FileContext ctx);
+	/**
+	 * Enter a parse tree produced by {@link KickCParser#stmtSeq}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtSeq(KickCParser.StmtSeqContext ctx);
+	/**
+	 * Exit a parse tree produced by {@link KickCParser#stmtSeq}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtSeq(KickCParser.StmtSeqContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtBlock}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtBlock(KickCParser.StmtBlockContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtBlock}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtBlock(KickCParser.StmtBlockContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtAssignment}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtAssignment(KickCParser.StmtAssignmentContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtAssignment}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtAssignment(KickCParser.StmtAssignmentContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtExpr}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtExpr(KickCParser.StmtExprContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtExpr}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtExpr(KickCParser.StmtExprContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtIfElse}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtIfElse(KickCParser.StmtIfElseContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtIfElse}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtIfElse(KickCParser.StmtIfElseContext ctx);
+	/**
+	 * Enter a parse tree produced by the {@code stmtWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void enterStmtWhile(KickCParser.StmtWhileContext ctx);
+	/**
+	 * Exit a parse tree produced by the {@code stmtWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 */
+	void exitStmtWhile(KickCParser.StmtWhileContext 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 0498deadb..44744aa15 100644
--- a/src/dk/camelot64/kickc/parser/KickCParser.java
+++ b/src/dk/camelot64/kickc/parser/KickCParser.java
@@ -19,25 +19,27 @@ public class KickCParser extends Parser {
 	public static final int
 		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, STRING=23, BOOLEAN=24, 
-		NUMBER=25, NUMFLOAT=26, BINFLOAT=27, DECFLOAT=28, HEXFLOAT=29, NUMINT=30, 
-		BININTEGER=31, DECINTEGER=32, HEXINTEGER=33, NAME=34, WS=35;
+		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;
 	public static final int
-		RULE_expr = 0;
+		RULE_file = 0, RULE_stmtSeq = 1, RULE_stmt = 2, RULE_expr = 3;
 	public static final String[] ruleNames = {
-		"expr"
+		"file", "stmtSeq", "stmt", "expr"
 	};
 
 	private static final String[] _LITERAL_NAMES = {
-		null, "'('", "')'", "'+'", "'-'", "'not'", "'!'", "'*'", "'/'", "'='", 
-		"'=='", "'!='", "'<>'", "'<'", "'<='", "'=<'", "'>='", "'=>'", "'>'", 
-		"'and'", "'&&'", "'or'", "'||'"
+		null, "'{'", "'}'", "'='", "';'", "'if'", "'('", "')'", "'else'", "'while'", 
+		"'+'", "'-'", "'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, "STRING", 
-		"BOOLEAN", "NUMBER", "NUMFLOAT", "BINFLOAT", "DECFLOAT", "HEXFLOAT", "NUMINT", 
-		"BININTEGER", "DECINTEGER", "HEXINTEGER", "NAME", "WS"
+		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"
 	};
 	public static final Vocabulary VOCABULARY = new VocabularyImpl(_LITERAL_NAMES, _SYMBOLIC_NAMES);
 
@@ -88,6 +90,350 @@ public class KickCParser extends Parser {
 		super(input);
 		_interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);
 	}
+	public static class FileContext extends ParserRuleContext {
+		public StmtSeqContext stmtSeq() {
+			return getRuleContext(StmtSeqContext.class,0);
+		}
+		public TerminalNode EOF() { return getToken(KickCParser.EOF, 0); }
+		public FileContext(ParserRuleContext parent, int invokingState) {
+			super(parent, invokingState);
+		}
+		@Override public int getRuleIndex() { return RULE_file; }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterFile(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitFile(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitFile(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+
+	public final FileContext file() throws RecognitionException {
+		FileContext _localctx = new FileContext(_ctx, getState());
+		enterRule(_localctx, 0, RULE_file);
+		try {
+			enterOuterAlt(_localctx, 1);
+			{
+			setState(8);
+			stmtSeq();
+			setState(9);
+			match(EOF);
+			}
+		}
+		catch (RecognitionException re) {
+			_localctx.exception = re;
+			_errHandler.reportError(this, re);
+			_errHandler.recover(this, re);
+		}
+		finally {
+			exitRule();
+		}
+		return _localctx;
+	}
+
+	public static class StmtSeqContext extends ParserRuleContext {
+		public List<StmtContext> stmt() {
+			return getRuleContexts(StmtContext.class);
+		}
+		public StmtContext stmt(int i) {
+			return getRuleContext(StmtContext.class,i);
+		}
+		public StmtSeqContext(ParserRuleContext parent, int invokingState) {
+			super(parent, invokingState);
+		}
+		@Override public int getRuleIndex() { return RULE_stmtSeq; }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtSeq(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtSeq(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtSeq(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+
+	public final StmtSeqContext stmtSeq() throws RecognitionException {
+		StmtSeqContext _localctx = new StmtSeqContext(_ctx, getState());
+		enterRule(_localctx, 2, RULE_stmtSeq);
+		int _la;
+		try {
+			enterOuterAlt(_localctx, 1);
+			{
+			setState(12); 
+			_errHandler.sync(this);
+			_la = _input.LA(1);
+			do {
+				{
+				{
+				setState(11);
+				stmt();
+				}
+				}
+				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) );
+			}
+		}
+		catch (RecognitionException re) {
+			_localctx.exception = re;
+			_errHandler.reportError(this, re);
+			_errHandler.recover(this, re);
+		}
+		finally {
+			exitRule();
+		}
+		return _localctx;
+	}
+
+	public static class StmtContext extends ParserRuleContext {
+		public StmtContext(ParserRuleContext parent, int invokingState) {
+			super(parent, invokingState);
+		}
+		@Override public int getRuleIndex() { return RULE_stmt; }
+	 
+		public StmtContext() { }
+		public void copyFrom(StmtContext ctx) {
+			super.copyFrom(ctx);
+		}
+	}
+	public static class StmtBlockContext extends StmtContext {
+		public StmtSeqContext stmtSeq() {
+			return getRuleContext(StmtSeqContext.class,0);
+		}
+		public StmtBlockContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtBlock(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtBlock(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtBlock(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+	public static class StmtExprContext extends StmtContext {
+		public ExprContext expr() {
+			return getRuleContext(ExprContext.class,0);
+		}
+		public StmtExprContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtExpr(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtExpr(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtExpr(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+	public static class StmtWhileContext extends StmtContext {
+		public ExprContext expr() {
+			return getRuleContext(ExprContext.class,0);
+		}
+		public StmtContext stmt() {
+			return getRuleContext(StmtContext.class,0);
+		}
+		public StmtWhileContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtWhile(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtWhile(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtWhile(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); }
+		public ExprContext expr() {
+			return getRuleContext(ExprContext.class,0);
+		}
+		public StmtAssignmentContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtAssignment(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtAssignment(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtAssignment(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+	public static class StmtIfElseContext extends StmtContext {
+		public ExprContext expr() {
+			return getRuleContext(ExprContext.class,0);
+		}
+		public List<StmtContext> stmt() {
+			return getRuleContexts(StmtContext.class);
+		}
+		public StmtContext stmt(int i) {
+			return getRuleContext(StmtContext.class,i);
+		}
+		public StmtIfElseContext(StmtContext ctx) { copyFrom(ctx); }
+		@Override
+		public void enterRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).enterStmtIfElse(this);
+		}
+		@Override
+		public void exitRule(ParseTreeListener listener) {
+			if ( listener instanceof KickCListener ) ((KickCListener)listener).exitStmtIfElse(this);
+		}
+		@Override
+		public <T> T accept(ParseTreeVisitor<? extends T> visitor) {
+			if ( visitor instanceof KickCVisitor ) return ((KickCVisitor<? extends T>)visitor).visitStmtIfElse(this);
+			else return visitor.visitChildren(this);
+		}
+	}
+
+	public final StmtContext stmt() throws RecognitionException {
+		StmtContext _localctx = new StmtContext(_ctx, getState());
+		enterRule(_localctx, 4, RULE_stmt);
+		int _la;
+		try {
+			setState(47);
+			_errHandler.sync(this);
+			switch ( getInterpreter().adaptivePredict(_input,4,_ctx) ) {
+			case 1:
+				_localctx = new StmtBlockContext(_localctx);
+				enterOuterAlt(_localctx, 1);
+				{
+				setState(16);
+				match(T__0);
+				setState(17);
+				stmtSeq();
+				setState(18);
+				match(T__1);
+				}
+				break;
+			case 2:
+				_localctx = new StmtAssignmentContext(_localctx);
+				enterOuterAlt(_localctx, 2);
+				{
+				setState(21);
+				_errHandler.sync(this);
+				_la = _input.LA(1);
+				if (_la==TYPE) {
+					{
+					setState(20);
+					match(TYPE);
+					}
+				}
+
+				setState(23);
+				match(NAME);
+				setState(26);
+				_errHandler.sync(this);
+				_la = _input.LA(1);
+				if (_la==T__2) {
+					{
+					setState(24);
+					match(T__2);
+					setState(25);
+					expr(0);
+					}
+				}
+
+				setState(28);
+				match(T__3);
+				}
+				break;
+			case 3:
+				_localctx = new StmtExprContext(_localctx);
+				enterOuterAlt(_localctx, 3);
+				{
+				setState(29);
+				expr(0);
+				setState(30);
+				match(T__3);
+				}
+				break;
+			case 4:
+				_localctx = new StmtIfElseContext(_localctx);
+				enterOuterAlt(_localctx, 4);
+				{
+				setState(32);
+				match(T__4);
+				setState(33);
+				match(T__5);
+				setState(34);
+				expr(0);
+				setState(35);
+				match(T__6);
+				setState(36);
+				stmt();
+				setState(39);
+				_errHandler.sync(this);
+				switch ( getInterpreter().adaptivePredict(_input,3,_ctx) ) {
+				case 1:
+					{
+					setState(37);
+					match(T__7);
+					setState(38);
+					stmt();
+					}
+					break;
+				}
+				}
+				break;
+			case 5:
+				_localctx = new StmtWhileContext(_localctx);
+				enterOuterAlt(_localctx, 5);
+				{
+				setState(41);
+				match(T__8);
+				setState(42);
+				match(T__5);
+				setState(43);
+				expr(0);
+				setState(44);
+				match(T__6);
+				setState(45);
+				stmt();
+				}
+				break;
+			}
+		}
+		catch (RecognitionException re) {
+			_localctx.exception = re;
+			_errHandler.reportError(this, re);
+			_errHandler.recover(this, re);
+		}
+		finally {
+			exitRule();
+		}
+		return _localctx;
+	}
+
 	public static class ExprContext extends ParserRuleContext {
 		public ExprContext(ParserRuleContext parent, int invokingState) {
 			super(parent, invokingState);
@@ -237,41 +583,41 @@ public class KickCParser extends Parser {
 		int _parentState = getState();
 		ExprContext _localctx = new ExprContext(_ctx, _parentState);
 		ExprContext _prevctx = _localctx;
-		int _startState = 0;
-		enterRecursionRule(_localctx, 0, RULE_expr, _p);
+		int _startState = 6;
+		enterRecursionRule(_localctx, 6, RULE_expr, _p);
 		int _la;
 		try {
 			int _alt;
 			enterOuterAlt(_localctx, 1);
 			{
-			setState(13);
+			setState(60);
 			_errHandler.sync(this);
 			switch (_input.LA(1)) {
-			case T__0:
+			case T__5:
 				{
 				_localctx = new ExprParContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
 
-				setState(3);
-				match(T__0);
-				setState(4);
+				setState(50);
+				match(T__5);
+				setState(51);
 				expr(0);
-				setState(5);
-				match(T__1);
+				setState(52);
+				match(T__6);
 				}
 				break;
-			case T__2:
-			case T__3:
-			case T__4:
-			case T__5:
+			case T__9:
+			case T__10:
+			case T__11:
+			case T__12:
 				{
 				_localctx = new ExprUnaryContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(7);
+				setState(54);
 				_la = _input.LA(1);
-				if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__2) | (1L << T__3) | (1L << T__4) | (1L << T__5))) != 0)) ) {
+				if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__9) | (1L << T__10) | (1L << T__11) | (1L << T__12))) != 0)) ) {
 				_errHandler.recoverInline(this);
 				}
 				else {
@@ -279,7 +625,7 @@ public class KickCParser extends Parser {
 					_errHandler.reportMatch(this);
 					consume();
 				}
-				setState(8);
+				setState(55);
 				expr(10);
 				}
 				break;
@@ -288,7 +634,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprIdContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(9);
+				setState(56);
 				match(NAME);
 				}
 				break;
@@ -297,7 +643,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprNumberContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(10);
+				setState(57);
 				match(NUMBER);
 				}
 				break;
@@ -306,7 +652,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprStringContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(11);
+				setState(58);
 				match(STRING);
 				}
 				break;
@@ -315,7 +661,7 @@ public class KickCParser extends Parser {
 				_localctx = new ExprBoolContext(_localctx);
 				_ctx = _localctx;
 				_prevctx = _localctx;
-				setState(12);
+				setState(59);
 				match(BOOLEAN);
 				}
 				break;
@@ -323,26 +669,26 @@ public class KickCParser extends Parser {
 				throw new NoViableAltException(this);
 			}
 			_ctx.stop = _input.LT(-1);
-			setState(32);
+			setState(79);
 			_errHandler.sync(this);
-			_alt = getInterpreter().adaptivePredict(_input,2,_ctx);
+			_alt = getInterpreter().adaptivePredict(_input,7,_ctx);
 			while ( _alt!=2 && _alt!=org.antlr.v4.runtime.atn.ATN.INVALID_ALT_NUMBER ) {
 				if ( _alt==1 ) {
 					if ( _parseListeners!=null ) triggerExitRuleEvent();
 					_prevctx = _localctx;
 					{
-					setState(30);
+					setState(77);
 					_errHandler.sync(this);
-					switch ( getInterpreter().adaptivePredict(_input,1,_ctx) ) {
+					switch ( getInterpreter().adaptivePredict(_input,6,_ctx) ) {
 					case 1:
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(15);
+						setState(62);
 						if (!(precpred(_ctx, 9))) throw new FailedPredicateException(this, "precpred(_ctx, 9)");
-						setState(16);
+						setState(63);
 						_la = _input.LA(1);
-						if ( !(_la==T__6 || _la==T__7) ) {
+						if ( !(_la==T__13 || _la==T__14) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -350,7 +696,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(17);
+						setState(64);
 						expr(10);
 						}
 						break;
@@ -358,11 +704,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(18);
+						setState(65);
 						if (!(precpred(_ctx, 8))) throw new FailedPredicateException(this, "precpred(_ctx, 8)");
-						setState(19);
+						setState(66);
 						_la = _input.LA(1);
-						if ( !(_la==T__2 || _la==T__3) ) {
+						if ( !(_la==T__9 || _la==T__10) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -370,7 +716,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(20);
+						setState(67);
 						expr(9);
 						}
 						break;
@@ -378,11 +724,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(21);
+						setState(68);
 						if (!(precpred(_ctx, 7))) throw new FailedPredicateException(this, "precpred(_ctx, 7)");
-						setState(22);
+						setState(69);
 						_la = _input.LA(1);
-						if ( !((((_la) & ~0x3f) == 0 && ((1L << _la) & ((1L << T__8) | (1L << T__9) | (1L << T__10) | (1L << T__11) | (1L << T__12) | (1L << T__13) | (1L << T__14) | (1L << T__15) | (1L << T__16) | (1L << T__17))) != 0)) ) {
+						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)) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -390,7 +736,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(23);
+						setState(70);
 						expr(8);
 						}
 						break;
@@ -398,11 +744,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(24);
+						setState(71);
 						if (!(precpred(_ctx, 6))) throw new FailedPredicateException(this, "precpred(_ctx, 6)");
-						setState(25);
+						setState(72);
 						_la = _input.LA(1);
-						if ( !(_la==T__18 || _la==T__19) ) {
+						if ( !(_la==T__24 || _la==T__25) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -410,7 +756,7 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(26);
+						setState(73);
 						expr(7);
 						}
 						break;
@@ -418,11 +764,11 @@ public class KickCParser extends Parser {
 						{
 						_localctx = new ExprBinaryContext(new ExprContext(_parentctx, _parentState));
 						pushNewRecursionContext(_localctx, _startState, RULE_expr);
-						setState(27);
+						setState(74);
 						if (!(precpred(_ctx, 5))) throw new FailedPredicateException(this, "precpred(_ctx, 5)");
-						setState(28);
+						setState(75);
 						_la = _input.LA(1);
-						if ( !(_la==T__20 || _la==T__21) ) {
+						if ( !(_la==T__26 || _la==T__27) ) {
 						_errHandler.recoverInline(this);
 						}
 						else {
@@ -430,16 +776,16 @@ public class KickCParser extends Parser {
 							_errHandler.reportMatch(this);
 							consume();
 						}
-						setState(29);
+						setState(76);
 						expr(6);
 						}
 						break;
 					}
 					} 
 				}
-				setState(34);
+				setState(81);
 				_errHandler.sync(this);
-				_alt = getInterpreter().adaptivePredict(_input,2,_ctx);
+				_alt = getInterpreter().adaptivePredict(_input,7,_ctx);
 			}
 			}
 		}
@@ -456,7 +802,7 @@ public class KickCParser extends Parser {
 
 	public boolean sempred(RuleContext _localctx, int ruleIndex, int predIndex) {
 		switch (ruleIndex) {
-		case 0:
+		case 3:
 			return expr_sempred((ExprContext)_localctx, predIndex);
 		}
 		return true;
@@ -478,19 +824,30 @@ public class KickCParser extends Parser {
 	}
 
 	public static final String _serializedATN =
-		"\3\u608b\ua72a\u8133\ub9ed\u417c\u3be7\u7786\u5964\3%&\4\2\t\2\3\2\3\2"+
-		"\3\2\3\2\3\2\3\2\3\2\3\2\3\2\3\2\3\2\5\2\20\n\2\3\2\3\2\3\2\3\2\3\2\3"+
-		"\2\3\2\3\2\3\2\3\2\3\2\3\2\3\2\3\2\3\2\7\2!\n\2\f\2\16\2$\13\2\3\2\2\3"+
-		"\2\3\2\2\b\3\2\5\b\3\2\t\n\3\2\5\6\3\2\13\24\3\2\25\26\3\2\27\30\2.\2"+
-		"\17\3\2\2\2\4\5\b\2\1\2\5\6\7\3\2\2\6\7\5\2\2\2\7\b\7\4\2\2\b\20\3\2\2"+
-		"\2\t\n\t\2\2\2\n\20\5\2\2\f\13\20\7$\2\2\f\20\7\33\2\2\r\20\7\31\2\2\16"+
-		"\20\7\32\2\2\17\4\3\2\2\2\17\t\3\2\2\2\17\13\3\2\2\2\17\f\3\2\2\2\17\r"+
-		"\3\2\2\2\17\16\3\2\2\2\20\"\3\2\2\2\21\22\f\13\2\2\22\23\t\3\2\2\23!\5"+
-		"\2\2\f\24\25\f\n\2\2\25\26\t\4\2\2\26!\5\2\2\13\27\30\f\t\2\2\30\31\t"+
-		"\5\2\2\31!\5\2\2\n\32\33\f\b\2\2\33\34\t\6\2\2\34!\5\2\2\t\35\36\f\7\2"+
-		"\2\36\37\t\7\2\2\37!\5\2\2\b \21\3\2\2\2 \24\3\2\2\2 \27\3\2\2\2 \32\3"+
-		"\2\2\2 \35\3\2\2\2!$\3\2\2\2\" \3\2\2\2\"#\3\2\2\2#\3\3\2\2\2$\"\3\2\2"+
-		"\2\5\17 \"";
+		"\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";
 	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 969d3ace7..ccafef85a 100644
--- a/src/dk/camelot64/kickc/parser/KickCVisitor.java
+++ b/src/dk/camelot64/kickc/parser/KickCVisitor.java
@@ -10,6 +10,53 @@ import org.antlr.v4.runtime.tree.ParseTreeVisitor;
  * operations with no return type.
  */
 public interface KickCVisitor<T> extends ParseTreeVisitor<T> {
+	/**
+	 * Visit a parse tree produced by {@link KickCParser#file}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitFile(KickCParser.FileContext ctx);
+	/**
+	 * Visit a parse tree produced by {@link KickCParser#stmtSeq}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtSeq(KickCParser.StmtSeqContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtBlock}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtBlock(KickCParser.StmtBlockContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtAssignment}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtAssignment(KickCParser.StmtAssignmentContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtExpr}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtExpr(KickCParser.StmtExprContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtIfElse}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtIfElse(KickCParser.StmtIfElseContext ctx);
+	/**
+	 * Visit a parse tree produced by the {@code stmtWhile}
+	 * labeled alternative in {@link KickCParser#stmt}.
+	 * @param ctx the parse tree
+	 * @return the visitor result
+	 */
+	T visitStmtWhile(KickCParser.StmtWhileContext ctx);
 	/**
 	 * Visit a parse tree produced by the {@code exprBinary}
 	 * labeled alternative in {@link KickCParser#expr}.
diff --git a/src/dk/camelot64/kickc/ssa/GenerateSSA.java b/src/dk/camelot64/kickc/ssa/GenerateSSA.java
index 55223b377..64c710541 100644
--- a/src/dk/camelot64/kickc/ssa/GenerateSSA.java
+++ b/src/dk/camelot64/kickc/ssa/GenerateSSA.java
@@ -5,16 +5,110 @@ import dk.camelot64.kickc.parser.KickCParser;
 import org.antlr.v4.runtime.tree.TerminalNode;
 
 /** Generates program SSA form by visiting the ANTLR4 parse tree*/
-public class GenerateSSA extends KickCBaseVisitor<SSAFragment> {
+public class GenerateSSA extends KickCBaseVisitor<SSARValue> {
 
-   SSAVariableManager variableManager;
+   private SymbolManager symbolManager;
+   private SSASequence sequence;
 
-   public GenerateSSA(SSAVariableManager variableManager) {
-      this.variableManager = variableManager;
+   public GenerateSSA() {
+      this.symbolManager = new SymbolManager();
+      this.sequence = new SSASequence();
    }
 
    @Override
-   public SSAFragment visitExprNumber(KickCParser.ExprNumberContext ctx) {
+   public SSARValue visitFile(KickCParser.FileContext ctx) {
+      this.visit(ctx.stmtSeq());
+      return null;
+   }
+
+
+   @Override
+   public SSARValue visitStmtSeq(KickCParser.StmtSeqContext ctx) {
+      for(int i=0; i<ctx.getChildCount(); i++) {
+         this.visit(ctx.stmt(i));
+      }
+      return null;
+   }
+
+   @Override
+   public SSARValue visitStmtBlock(KickCParser.StmtBlockContext ctx) {
+      this.visit(ctx.stmtSeq());
+      return null;
+   }
+
+   @Override
+   public SSARValue visitStmtExpr(KickCParser.StmtExprContext ctx) {
+      this.visit(ctx.expr());
+      return null;
+   }
+
+   @Override
+   public SSARValue visitStmtIfElse(KickCParser.StmtIfElseContext ctx) {
+      SSARValue rValue = this.visit(ctx.expr());
+      SSAJumpLabel ifJumpLabel = symbolManager.newIntermediateJumpLabel();
+      SSAJumpLabel elseJumpLabel = symbolManager.newIntermediateJumpLabel();
+      SSAStatement ifJmpStmt = new SSAStatementConditionalJump(rValue, ifJumpLabel);
+      sequence.addStatement(ifJmpStmt);
+      SSAStatement elseJmpStmt = new SSAStatementJump(elseJumpLabel);
+      sequence.addStatement(elseJmpStmt);
+      SSAStatementJumpTarget ifJumpTarget = new SSAStatementJumpTarget(ifJumpLabel);
+      sequence.addStatement(ifJumpTarget);
+      this.visit(ctx.stmt(0));
+      KickCParser.StmtContext elseStmt = ctx.stmt(1);
+      if(elseStmt!=null) {
+         SSAJumpLabel endJumpLabel = symbolManager.newIntermediateJumpLabel();
+         SSAStatement endJmpStmt = new SSAStatementJump(endJumpLabel);
+         sequence.addStatement(endJmpStmt);
+         SSAStatementJumpTarget elseJumpTarget = new SSAStatementJumpTarget(elseJumpLabel);
+         sequence.addStatement(elseJumpTarget);
+         this.visit(elseStmt);
+         SSAStatementJumpTarget endJumpTarget = new SSAStatementJumpTarget(endJumpLabel);
+         sequence.addStatement(endJumpTarget);
+      }  else {
+         SSAStatementJumpTarget elseJumpTarget = new SSAStatementJumpTarget(elseJumpLabel);
+         sequence.addStatement(elseJumpTarget);
+      }
+      return null;
+   }
+
+   @Override
+   public SSARValue visitStmtWhile(KickCParser.StmtWhileContext ctx) {
+      SSAJumpLabel beginJumpLabel = symbolManager.newIntermediateJumpLabel();
+      SSAJumpLabel doJumpLabel = symbolManager.newIntermediateJumpLabel();
+      SSAJumpLabel endJumpLabel = symbolManager.newIntermediateJumpLabel();
+      SSAStatementJumpTarget beginJumpTarget = new SSAStatementJumpTarget(beginJumpLabel);
+      sequence.addStatement(beginJumpTarget);
+      SSARValue rValue = this.visit(ctx.expr());
+      SSAStatement doJmpStmt = new SSAStatementConditionalJump(rValue, doJumpLabel);
+      sequence.addStatement(doJmpStmt);
+      SSAStatement endJmpStmt = new SSAStatementJump(endJumpLabel);
+      sequence.addStatement(endJmpStmt);
+      SSAStatementJumpTarget doJumpTarget = new SSAStatementJumpTarget(doJumpLabel);
+      sequence.addStatement(doJumpTarget);
+      this.visit(ctx.stmt());
+      SSAStatement beginJmpStmt = new SSAStatementJump(beginJumpLabel);
+      sequence.addStatement(beginJmpStmt);
+      SSAStatementJumpTarget endJumpTarget = new SSAStatementJumpTarget(endJumpLabel);
+      sequence.addStatement(endJumpTarget);
+      return null;
+   }
+
+   @Override
+   public SSARValue visitStmtAssignment(KickCParser.StmtAssignmentContext ctx) {
+      if(ctx.TYPE()!=null) {
+         symbolManager.newVariableDeclaration(ctx.NAME().getText(), ctx.TYPE().getText());
+      }
+      if(ctx.expr()!=null) {
+         SSARValue rValue = this.visit(ctx.expr());
+         Symbol variable = symbolManager.newVariableAssignment(ctx.NAME().getText());
+         SSAStatement stmt = new SSAStatementAssignment(variable, rValue);
+         sequence.addStatement(stmt);
+      }
+      return null;
+   }
+
+   @Override
+   public SSARValue visitExprNumber(KickCParser.ExprNumberContext ctx) {
       Number number = KickCNumberParser.parseLiteral(ctx.getText());
       if(number instanceof Integer)  {
          return new SSAConstantInteger((Integer) number);
@@ -24,54 +118,55 @@ public class GenerateSSA extends KickCBaseVisitor<SSAFragment> {
    }
 
    @Override
-   public SSAFragment visitExprString(KickCParser.ExprStringContext ctx) {
+   public SSARValue visitExprString(KickCParser.ExprStringContext ctx) {
       return new SSAConstantString(ctx.getText());
    }
 
    @Override
-   public SSAFragment visitExprBool(KickCParser.ExprBoolContext ctx) {
+   public SSARValue visitExprBool(KickCParser.ExprBoolContext ctx) {
       String bool = ctx.getText();
-      return new SSAConstantBool(new Boolean(bool));
+      return new SSAConstantBool(Boolean.valueOf(bool));
    }
 
 
    @Override
-   public SSAFragment visitExprBinary(KickCParser.ExprBinaryContext ctx) {
-      SSAFragment left = this.visit(ctx.expr(0));
-      SSAFragment right = this.visit(ctx.expr(1));
+   public SSARValue visitExprBinary(KickCParser.ExprBinaryContext ctx) {
+      SSARValue left = this.visit(ctx.expr(0));
+      SSARValue right = this.visit(ctx.expr(1));
       String op = ((TerminalNode)ctx.getChild(1)).getSymbol().getText();
       SSAOperator operator = new SSAOperator(op);
-      SSAVariable tmpVar = variableManager.generateIntermediateVariable();
-      SSAStatement stmt = new SSAStatement(tmpVar, getSSARValue(left), operator, getSSARValue(right));
-      System.out.println(stmt);
-      return stmt;
+      Symbol tmpVar = symbolManager.newIntermediateAssignment();
+      SSAStatement stmt = new SSAStatementAssignment(tmpVar, left, operator, right);
+      sequence.addStatement(stmt);
+      return tmpVar;
    }
 
    @Override
-   public SSAFragment visitExprUnary(KickCParser.ExprUnaryContext ctx) {
-      SSAFragment child = this.visit(ctx.expr());
+   public SSARValue visitExprUnary(KickCParser.ExprUnaryContext ctx) {
+      SSARValue child = this.visit(ctx.expr());
       String op = ((TerminalNode)ctx.getChild(0)).getSymbol().getText();
       SSAOperator operator = new SSAOperator(op);
-      SSAVariable tmpVar = variableManager.generateIntermediateVariable();
-      SSAStatement stmt = new SSAStatement(tmpVar, operator, getSSARValue(child));
-      System.out.println(stmt);
-      return stmt;
+      Symbol tmpVar = symbolManager.newIntermediateAssignment();
+      SSAStatement stmt = new SSAStatementAssignment(tmpVar, operator, child);
+      sequence.addStatement(stmt);
+      return tmpVar;
    }
 
    @Override
-   public SSAFragment visitExprPar(KickCParser.ExprParContext ctx) {
+   public SSARValue visitExprPar(KickCParser.ExprParContext ctx) {
       return this.visit(ctx.expr());
    }
 
-   SSARValue getSSARValue(SSAFragment ssaFragment) {
-      if(ssaFragment instanceof SSARValue) {
-         return (SSARValue) ssaFragment;
-      } if(ssaFragment instanceof SSAStatement) {
-         SSAStatement ssaStatement = (SSAStatement) ssaFragment;
-         return (SSARValue) ssaStatement.getlValue();
-      }
-      throw new RuntimeException("Cannot extract SSA RValue");
+   @Override
+   public SSARValue visitExprId(KickCParser.ExprIdContext ctx) {
+      return symbolManager.newVariableUsage(ctx.NAME().getText());
    }
 
+   public SSASequence getSequence() {
+      return sequence;
+   }
 
+   public SymbolManager getSymbols() {
+      return this.symbolManager;
+   }
 }
diff --git a/src/dk/camelot64/kickc/ssa/PassTypeInference.java b/src/dk/camelot64/kickc/ssa/PassTypeInference.java
new file mode 100644
index 000000000..41b52efcd
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/PassTypeInference.java
@@ -0,0 +1,84 @@
+package dk.camelot64.kickc.ssa;
+
+/**
+ * Pass through the SSA statements inferring types of unresolved variables.
+ */
+public class PassTypeInference {
+
+   public void inferTypes(SSASequence sequence, SymbolManager symbols) {
+      for (SSAStatement statement : sequence.getStatements()) {
+         if (statement instanceof SSAStatementAssignment) {
+            SSAStatementAssignment assignment = (SSAStatementAssignment) statement;
+            Symbol symbol = (Symbol) assignment.getlValue();
+            if (SymbolType.VAR.equals(symbol.getType())) {
+               // Unresolved symbol - perform inference
+               SSAOperator operator = assignment.getOperator();
+               if (operator == null || assignment.getRValue1() == null) {
+                  // Copy operation or Unary operation
+                  SSARValue rValue = assignment.getRValue2();
+                  SymbolType type = inferType(rValue);
+                  symbol.setInferredType(type);
+               } else {
+                  // Binary operation
+                  SymbolType type1 = inferType(assignment.getRValue1());
+                  SymbolType type2 = inferType(assignment.getRValue2());
+                  SymbolType type = inferType(type1, operator, type2);
+                  symbol.setInferredType(type);
+               }
+            }
+         }
+      }
+   }
+
+   private SymbolType inferType(SymbolType type1, SSAOperator operator, SymbolType type2) {
+      String op = operator.getOperator();
+      switch (op) {
+         case "==":
+         case "<":
+         case "<=":
+         case "=<":
+         case ">":
+         case ">=":
+         case "=>":
+         case "<>":
+         case "!=":
+         case "&&":
+         case "||":
+         case "and":
+         case "or":
+            return SymbolType.BOOLEAN;
+         case "+":
+         case "-":
+         case "*":
+         case "/":
+            if (type1.equals(SymbolType.WORD) || type2.equals(SymbolType.WORD)) {
+               return SymbolType.WORD;
+            } else {
+               return SymbolType.BYTE;
+            }
+         default:
+            return SymbolType.VAR;
+      }
+   }
+
+   private SymbolType inferType(SSARValue rValue) {
+      SymbolType type = SymbolType.VAR;
+      if (rValue instanceof Symbol) {
+         Symbol rSymbol = (Symbol) rValue;
+         type = rSymbol.getType();
+      } else if (rValue instanceof SSAConstantInteger) {
+         SSAConstantInteger rInt = (SSAConstantInteger) rValue;
+         if (rInt.getNumber() < 256) {
+            type = SymbolType.BYTE;
+         } else {
+            type = SymbolType.WORD;
+         }
+      } else if (rValue instanceof SSAConstantString) {
+         type = SymbolType.STRING;
+      } else if (rValue instanceof SSAConstantBool) {
+         type = SymbolType.BOOLEAN;
+      }
+      return type;
+   }
+
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSABasicBlock.java b/src/dk/camelot64/kickc/ssa/SSABasicBlock.java
index a575225e9..9e35ecd15 100644
--- a/src/dk/camelot64/kickc/ssa/SSABasicBlock.java
+++ b/src/dk/camelot64/kickc/ssa/SSABasicBlock.java
@@ -1,7 +1,25 @@
 package dk.camelot64.kickc.ssa;
 
-/**
- * Created by jespergravgaard on 02/05/2017.
- */
+import java.util.ArrayList;
+import java.util.List;
+
+/** A sequence of SSA statements */
 public class SSABasicBlock {
+
+   List<SSAStatement> statements;
+
+   public SSABasicBlock() {
+      this.statements = new ArrayList<>();
+   }
+
+   public void addStatement(SSAStatement statement) {
+      this.statements.add(statement);
+   }
+
+   @Override
+   public String toString() {
+      return "SSABasicBlock{" +
+            "statements=" + statements +
+            '}';
+   }
 }
diff --git a/src/dk/camelot64/kickc/ssa/SSAConstantInteger.java b/src/dk/camelot64/kickc/ssa/SSAConstantInteger.java
index 82a02f5fc..b45c90caa 100644
--- a/src/dk/camelot64/kickc/ssa/SSAConstantInteger.java
+++ b/src/dk/camelot64/kickc/ssa/SSAConstantInteger.java
@@ -11,6 +11,10 @@ public class SSAConstantInteger implements SSAConstant {
       this.number = number;
    }
 
+   public Integer getNumber() {
+      return number;
+   }
+
    @Override
    public String toString() {
       return Integer.toString(number);
diff --git a/src/dk/camelot64/kickc/ssa/SSAJumpLabel.java b/src/dk/camelot64/kickc/ssa/SSAJumpLabel.java
new file mode 100644
index 000000000..2913fc646
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSAJumpLabel.java
@@ -0,0 +1,16 @@
+package dk.camelot64.kickc.ssa;
+
+/** A label representing a target of a jump in SSA code */
+public class SSAJumpLabel {
+
+   private String name;
+
+   public SSAJumpLabel(String name) {
+      this.name = name;
+   }
+
+   @Override
+   public String toString() {
+      return name;
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAOperator.java b/src/dk/camelot64/kickc/ssa/SSAOperator.java
index f93a9f941..c3a80eaac 100644
--- a/src/dk/camelot64/kickc/ssa/SSAOperator.java
+++ b/src/dk/camelot64/kickc/ssa/SSAOperator.java
@@ -9,6 +9,10 @@ public class SSAOperator {
       this.operator = operator;
    }
 
+   public String getOperator() {
+      return operator;
+   }
+
    @Override
    public String toString() {
       return operator ;
diff --git a/src/dk/camelot64/kickc/ssa/SSASequence.java b/src/dk/camelot64/kickc/ssa/SSASequence.java
new file mode 100644
index 000000000..fe91bdd1a
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSASequence.java
@@ -0,0 +1,33 @@
+package dk.camelot64.kickc.ssa;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A sequence of SSA Statements
+ */
+public class SSASequence {
+
+   List<SSAStatement> statements;
+
+   public SSASequence() {
+      this.statements = new ArrayList<>();
+   }
+
+   public void addStatement(SSAStatement statement) {
+      this.statements.add(statement);
+   }
+
+   @Override
+   public String toString() {
+      StringBuffer out = new StringBuffer();
+      for (SSAStatement statement : statements) {
+         out.append(statement.toString()+"\n");
+      }
+      return out.toString();
+   }
+
+   public List<SSAStatement> getStatements() {
+      return statements;
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAStatement.java b/src/dk/camelot64/kickc/ssa/SSAStatement.java
index 0098c9464..633e34a8a 100644
--- a/src/dk/camelot64/kickc/ssa/SSAStatement.java
+++ b/src/dk/camelot64/kickc/ssa/SSAStatement.java
@@ -3,50 +3,8 @@ package dk.camelot64.kickc.ssa;
 /**
  * Single Static Assignment Form Statement.
  * Intermediate form used for compiler optimization.
- * <br>
- * <i> X<sub>i</sub> := Y<sub>j</sub> &lt;op&gt; Z<sub>k</sub> </i>
- * <br>
- * <i> lValue := rValue1 &lt;operator&gt; rValue2 </i>
  */
-public class SSAStatement implements SSAFragment {
+public interface SSAStatement extends SSAFragment {
 
-   private SSALValue lValue;
-   private SSARValue rValue1;
-   private SSAOperator operator;
-   private SSARValue rValue2;
 
-   public SSAStatement(SSALValue lValue, SSARValue rValue1, SSAOperator operator, SSARValue rValue2) {
-      this.lValue = lValue;
-      this.rValue1 = rValue1;
-      this.operator = operator;
-      this.rValue2 = rValue2;
-   }
-
-   public SSAStatement(SSALValue lValue, SSAOperator operator, SSARValue rValue2) {
-      this.lValue = lValue;
-      this.rValue1 = null;
-      this.operator = operator;
-      this.rValue2 = rValue2;
-   }
-
-   public SSALValue getlValue() {
-      return lValue;
-   }
-
-   public SSARValue getrValue1() {
-      return rValue1;
-   }
-
-   public SSAOperator getOperator() {
-      return operator;
-   }
-
-   public SSARValue getrValue2() {
-      return rValue2;
-   }
-
-   @Override
-   public String toString() {
-      return lValue + " := " + (rValue1==null?"":rValue1) + " " + operator + " " + rValue2 ;
-   }
 }
diff --git a/src/dk/camelot64/kickc/ssa/SSAStatementAssignment.java b/src/dk/camelot64/kickc/ssa/SSAStatementAssignment.java
new file mode 100644
index 000000000..9fbc0b78f
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSAStatementAssignment.java
@@ -0,0 +1,66 @@
+package dk.camelot64.kickc.ssa;
+
+/**
+ * Single Static Assignment Form Statement.
+ * Intermediate form used for compiler optimization.
+ * <br>
+ * <i> X<sub>i</sub> := Y<sub>j</sub> &lt;op&gt; Z<sub>k</sub> </i>
+ * <br>
+ * <i> lValue := rValue1 &lt;operator&gt; rValue2 </i>
+ */
+public class SSAStatementAssignment implements SSAStatement {
+
+   /** The variable being assigned a value by the statement. */
+   private SSALValue lValue;
+
+   private SSARValue rValue1;
+   private SSAOperator operator;
+   private SSARValue rValue2;
+
+   public SSAStatementAssignment(SSALValue lValue, SSARValue rValue2) {
+      this.lValue = lValue;
+      this.rValue1 = null;
+      this.operator = null;
+      this.rValue2 = rValue2;
+   }
+
+   public SSAStatementAssignment(SSALValue lValue, SSARValue rValue1, SSAOperator operator, SSARValue rValue2) {
+      this.lValue = lValue;
+      this.rValue1 = rValue1;
+      this.operator = operator;
+      this.rValue2 = rValue2;
+   }
+
+   public SSAStatementAssignment(SSALValue lValue, SSAOperator operator, SSARValue rValue2) {
+      this.lValue = lValue;
+      this.rValue1 = null;
+      this.operator = operator;
+      this.rValue2 = rValue2;
+   }
+
+   public SSALValue getlValue() {
+      return lValue;
+   }
+
+   public SSARValue getRValue1() {
+      return rValue1;
+   }
+
+   public SSAOperator getOperator() {
+      return operator;
+   }
+
+   public SSARValue getRValue2() {
+      return rValue2;
+   }
+
+   @Override
+   public String toString() {
+      return
+               "  "+
+                  lValue + " ← " +
+                  (rValue1==null?"":rValue1+" ") +
+                  (operator==null?"":operator+" ") +
+                  rValue2 ;
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAStatementConditionalJump.java b/src/dk/camelot64/kickc/ssa/SSAStatementConditionalJump.java
new file mode 100644
index 000000000..5b0726c09
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSAStatementConditionalJump.java
@@ -0,0 +1,31 @@
+package dk.camelot64.kickc.ssa;
+
+/**
+ * Single Static Assignment Form Statement with a conditional jump.
+ * Intermediate form used for compiler optimization.
+ * <br>
+ * <i> if ( Y<sub>j</sub> ) goto XX </i>
+ */
+public class SSAStatementConditionalJump implements SSAStatement {
+
+   private SSARValue condition;
+   private SSAJumpLabel destination;
+
+   public SSAStatementConditionalJump(SSARValue condition, SSAJumpLabel destination) {
+      this.condition = condition;
+      this.destination = destination;
+   }
+
+   public SSARValue getCondition() {
+      return condition;
+   }
+
+   public SSAJumpLabel getDestination() {
+      return destination;
+   }
+
+   @Override
+   public String toString() {
+      return "  "+"if("+condition+") goto "+destination;
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAStatementJump.java b/src/dk/camelot64/kickc/ssa/SSAStatementJump.java
new file mode 100644
index 000000000..767406270
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSAStatementJump.java
@@ -0,0 +1,25 @@
+package dk.camelot64.kickc.ssa;
+
+/**
+ * Single Static Assignment Form Statement unconditional jump.
+ * Intermediate form used for compiler optimization.
+ * <br>
+ * <i> goto XX </i>
+ */
+public class SSAStatementJump implements SSAStatement {
+
+   private SSAJumpLabel destination;
+
+   public SSAStatementJump(SSAJumpLabel destination) {
+      this.destination = destination;
+   }
+
+   public SSAJumpLabel getDestination() {
+      return destination;
+   }
+
+   @Override
+   public String toString() {
+      return "  "+"goto "+destination;
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAStatementJumpTarget.java b/src/dk/camelot64/kickc/ssa/SSAStatementJumpTarget.java
new file mode 100644
index 000000000..4232b4bdb
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SSAStatementJumpTarget.java
@@ -0,0 +1,24 @@
+package dk.camelot64.kickc.ssa;
+
+/**
+ * Single Static Assignment Form Statement Jump target.
+ */
+public class SSAStatementJumpTarget implements SSAStatement {
+
+   private SSAJumpLabel label;
+
+   public SSAStatementJumpTarget(SSAJumpLabel label) {
+      this.label = label;
+   }
+
+   public SSAJumpLabel getLabel() {
+      return label;
+   }
+
+   @Override
+   public String toString() {
+      return label+":";
+   }
+
+
+}
diff --git a/src/dk/camelot64/kickc/ssa/SSAVariable.java b/src/dk/camelot64/kickc/ssa/SSAVariable.java
index 6fad2458f..674832225 100644
--- a/src/dk/camelot64/kickc/ssa/SSAVariable.java
+++ b/src/dk/camelot64/kickc/ssa/SSAVariable.java
@@ -4,12 +4,21 @@ package dk.camelot64.kickc.ssa;
  * <ul>
  *    <li>Each potential modification of a language variable becomes a separate versioned SSA variable.</li>
  *    <li>Expressions are broken into separate SSA statements, each defining a new temporary/intermediate variable.</li>
- * </ul>*/
-public class SSAVariable implements SSARValue, SSALValue {
+ * </ul>
+ *
+ * Named variables are initially created without serials. These are first added after the basic control blocks have been defined.
+ *
+ * */
+public class SSAVariable implements SSARValue, SSALValue, SSAFragment {
 
    private String name;
 
-   private int serial;
+   private Integer serial;
+
+   public SSAVariable(String name) {
+      this.name = name;
+      this.serial = null;
+   }
 
    public SSAVariable(String name, int serial) {
       this.name = name;
@@ -26,6 +35,6 @@ public class SSAVariable implements SSARValue, SSALValue {
 
    @Override
    public String toString() {
-      return name + '_' + serial;
+      return name + (serial==null?"":"_"+serial);
    }
 }
diff --git a/src/dk/camelot64/kickc/ssa/SSAVariableManager.java b/src/dk/camelot64/kickc/ssa/SSAVariableManager.java
deleted file mode 100644
index ea62d1522..000000000
--- a/src/dk/camelot64/kickc/ssa/SSAVariableManager.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package dk.camelot64.kickc.ssa;
-
-/** Manages creation of new variables from declarations or temporary (intermediate) */
-public class SSAVariableManager {
-
-   private int nxtTemporaryId = 1;
-
-   public SSAVariable generateIntermediateVariable() {
-      return new SSAVariable("@", nxtTemporaryId++);
-   }
-
-}
diff --git a/src/dk/camelot64/kickc/ssa/Symbol.java b/src/dk/camelot64/kickc/ssa/Symbol.java
new file mode 100644
index 000000000..cfa7991d2
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/Symbol.java
@@ -0,0 +1,43 @@
+package dk.camelot64.kickc.ssa;
+
+/** A Symbol (variable, jump label, etc.) */
+public class Symbol implements SSARValue, SSALValue, SSAFragment {
+
+   private String name;
+
+   private SymbolType type;
+
+   private boolean intermediate;
+
+   private boolean inferredType;
+
+   public Symbol(String name, SymbolType type, boolean intermediate) {
+      this.name = name;
+      this.type = type;
+      this.intermediate = intermediate;
+      this.inferredType = false;
+   }
+
+   public String getName() {
+      return name;
+   }
+
+   public SymbolType getType() {
+      return type;
+   }
+
+   public void setInferredType(SymbolType type) {
+      this.type = type;
+      this.inferredType = true;
+   }
+
+   public boolean isIntermediate() {
+      return intermediate;
+   }
+
+   @Override
+   public String toString() {
+      return "("+name + (intermediate?"*":"") + ": " + type.getTypeName() + (inferredType ?"*":"") + ")";
+   }
+
+}
diff --git a/src/dk/camelot64/kickc/ssa/SymbolManager.java b/src/dk/camelot64/kickc/ssa/SymbolManager.java
new file mode 100644
index 000000000..656d9757a
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SymbolManager.java
@@ -0,0 +1,68 @@
+package dk.camelot64.kickc.ssa;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Manages symbols (variables, labels)
+ */
+public class SymbolManager {
+
+   private Map<String, Symbol> symbols;
+
+   private int intermediateVarCount = 0;
+   private int intermediateLabelCount = 0;
+
+   public SymbolManager() {
+      this.symbols = new LinkedHashMap<>();
+   }
+
+   private Symbol addSymbol(String name, SymbolType symbolType, boolean intermediate) {
+      if(symbols.get(name)!=null) {
+         throw new RuntimeException("Symbol already declared "+name);
+      }
+      Symbol symbol = new Symbol(name, symbolType, intermediate);
+      symbols.put(name, symbol);
+      return symbol;
+   }
+
+   public void newVariableDeclaration(String name, String type) {
+      SymbolType symbolType = SymbolType.get(type);
+      addSymbol(name, symbolType, false);
+   }
+
+   public Symbol newVariableAssignment(String varName) {
+      return symbols.get(varName);
+   }
+
+   public Symbol newVariableUsage(String varName) {
+      return symbols.get(varName);
+   }
+
+   public Symbol newIntermediateAssignment() {
+      String name = "$"+intermediateVarCount++;
+      Symbol symbol = addSymbol(name, SymbolType.VAR, true);
+      return symbol;
+   }
+
+   public SSAJumpLabel newNamedJumpLabel(String name) {
+      Symbol symbol = addSymbol(name, SymbolType.LABEL, false);
+      return new SSAJumpLabel(name);
+   }
+
+   public SSAJumpLabel newIntermediateJumpLabel() {
+      String name = "@"+   intermediateLabelCount++;
+      addSymbol(name, SymbolType.LABEL, true);
+      return new SSAJumpLabel(name);
+   }
+
+   @Override
+   public String toString() {
+      StringBuffer out = new StringBuffer();
+      for (String name : symbols.keySet()) {
+         Symbol symbol = symbols.get(name);
+         out.append(symbol.toString() + "\n");
+      }
+      return out.toString();
+   }
+}
diff --git a/src/dk/camelot64/kickc/ssa/SymbolType.java b/src/dk/camelot64/kickc/ssa/SymbolType.java
new file mode 100644
index 000000000..cd7451243
--- /dev/null
+++ b/src/dk/camelot64/kickc/ssa/SymbolType.java
@@ -0,0 +1,33 @@
+package dk.camelot64.kickc.ssa;
+
+/** Symbol Types */
+public enum SymbolType {
+   BYTE("byte"),
+   WORD("word"),
+   STRING("string"),
+   BOOLEAN("boolean"),
+   LABEL("label"),
+   VAR("var");
+
+   private String typeName;
+
+   SymbolType(String typeName) {
+      this.typeName = typeName;
+   }
+
+   public String getTypeName() {
+      return typeName;
+   }
+
+   public static SymbolType get(String name) {
+      switch (name) {
+         case "byte": return BYTE;
+         case "word": return WORD;
+         case "string": return STRING;
+         case "boolean": return BOOLEAN;
+      }
+      return null;
+   }
+
+
+}
diff --git a/src/dk/camelot64/kickc/test/main.java b/src/dk/camelot64/kickc/test/main.java
index eff6b480d..9140a0000 100644
--- a/src/dk/camelot64/kickc/test/main.java
+++ b/src/dk/camelot64/kickc/test/main.java
@@ -3,7 +3,8 @@ package dk.camelot64.kickc.test;
 import dk.camelot64.kickc.parser.KickCLexer;
 import dk.camelot64.kickc.parser.KickCParser;
 import dk.camelot64.kickc.ssa.GenerateSSA;
-import dk.camelot64.kickc.ssa.SSAVariableManager;
+import dk.camelot64.kickc.ssa.PassTypeInference;
+import dk.camelot64.kickc.ssa.SSASequence;
 import org.antlr.v4.runtime.CharStream;
 import org.antlr.v4.runtime.CharStreams;
 import org.antlr.v4.runtime.CommonTokenStream;
@@ -18,9 +19,17 @@ public class main {
       KickCLexer lexer = new KickCLexer(input);
       KickCParser parser = new KickCParser(new CommonTokenStream(lexer));
       parser.setBuildParseTree(true);
-      KickCParser.ExprContext expr = parser.expr();
-      GenerateSSA ev = new GenerateSSA(new SSAVariableManager());
-      Object result = ev.visit(expr);
+      KickCParser.FileContext file = parser.file();
+      GenerateSSA ev = new GenerateSSA();
+      ev.visit(file);
+
+      PassTypeInference passTypeInference = new PassTypeInference();
+      passTypeInference.inferTypes(ev.getSequence(), ev.getSymbols());
+
+      System.out.println("PROGRAM");
+      System.out.println(ev.getSequence().toString());
+      System.out.println("SYMBOLS");
+      System.out.println(ev.getSymbols().toString());
    }
 
 }
diff --git a/src/dk/camelot64/kickc/test/test.kc b/src/dk/camelot64/kickc/test/test.kc
index be3d6487d..2b83b3453 100644
--- a/src/dk/camelot64/kickc/test/test.kc
+++ b/src/dk/camelot64/kickc/test/test.kc
@@ -1 +1,7 @@
-1+2*3/(-$4+%101) = 12 || 1+1=2 && "qwe" < "asd" and not false
\ No newline at end of file
+byte a = 0;
+word b = 0;
+while(a<10) {
+  b=b+a;
+  a=a+1;
+}
+byte c = -a;
\ No newline at end of file