Add array literals and X64 compilation proof of concept

- Add static and dynamic array declaration syntax
- Implement array literal initialization [1, 2, 3, 4, 5]
- Add array element access and assignment (arr[index])
- Implement Length() builtin function for arrays
- Add X64 compilation proof of concept with in-memory execution
- Generate working x64 machine code with runtime calls
- Add 8 array operation tests (all passing)
- Achieve 27/27 test suite success rate
- Validate complex programs: factorial, prime detection, games
- Establish dual execution paths: VM interpretation + X64 proof of concept

Author: jarroddavis68

ROADMAP.md

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+# TinyPascal Development Roadmap
+
+**🎯 Goal: Complete Modern Pascal Implementation (Excluding OOP)**
+
+## ✅ Completed Features
+
+### Core Infrastructure
+- [x] **UTF-8 Lexer** - Complete tokenizer with full Pascal syntax support
+- [x] **Recursive Descent Parser** - Full expression parsing with proper precedence
+- [x] **AST System** - Complete Abstract Syntax Tree with Visitor pattern
+- [x] **Type System** - Int64, UInt64, Float64, String, Boolean with conversions
+- [x] **Bytecode Engine** - Complete instruction set and bytecode generation
+- [x] **Virtual Machine** - Stack-based VM with full instruction execution
+- [x] **X64 Compilation** - Proof of concept native compilation with in-memory execution
+- [x] **Runtime System** - Built-in functions and native runtime support
+
+### Language Features
+- [x] **Program Structure** - `program ProgramName; ... end.`
+- [x] **Variable Declarations** - `var x: Int; y: Float; s: String;`
+- [x] **Basic Types** - Int (Int64), UInt (UInt64), Float (Double), String (UTF-8), Boolean
+- [x] **Literals** - Integer, float, string, boolean literals
+- [x] **Arithmetic Operators** - `+`, `-`, `*`, `/` with proper precedence
+- [x] **Comparison Operators** - `=`, `<>`, `<`, `<=`, `>`, `>=`
+- [x] **Logical Operators** - `and`, `or`, `not`
+- [x] **Assignment** - `:=` operator
+- [x] **Expressions** - Complex nested expressions with parentheses
+- [x] **Control Flow** - `if/then/else`, `while/do`, `for/to/do`
+- [x] **Built-in Functions** - `PrintLn`, `Print`, `IntToStr`, `StrToInt`, `FloatToStr`, `StrToFloat`
+- [x] **Comments** - `//`, `{ }`, `(* *)` style comments
+
+### Array Support (New!)
+- [x] **Static Arrays** - `array[1..10] of Int`
+- [x] **Dynamic Arrays** - `array of Int` (declaration and Length() working)
+- [x] **Array Literals** - `[1, 2, 3, 4, 5]`
+- [x] **Array Element Access** - `arr[index]` for reading elements
+- [x] **Array Element Assignment** - `arr[index] := value`
+- [x] **Length() Function** - Get array size with `Length(arr)`
+
+### Development Tools
+- [x] **Comprehensive Test Suite** - 27+ test cases covering all features
+- [x] **Bytecode Disassembler** - Debug and inspect generated bytecode
+- [x] **Error Handling** - Parse errors with line/column information
+- [x] **Performance Tracking** - VM execution statistics
+
+---
+
+## 🚧 In Progress
+- [ ] **Current Session Focus** - *To be updated based on current work*
+
+---
+
+## 📋 Planned Features
+
+### Phase 1: Data Types & Collections 🏗️
+
+#### Arrays (Partial - Core Features Working)
+- [ ] **Multi-dimensional Arrays** - `array[1..5, 1..10] of Int`
+- [ ] **Array Operations** - Assignment (`arr1 := arr2`), comparison, slicing
+- [ ] **Dynamic Array Functions** - `SetLength`, `High`, `Low`
+
+#### Records/Structures
+- [ ] **Record Types** - `type Person = record Name: String; Age: Int; end;`
+- [ ] **Record Variables** - Declaration and field access
+- [ ] **Nested Records** - Records containing other records
+- [ ] **Record Assignment** - Deep copy semantics
+- [ ] **With Statements** - `with Person do begin Name := 'John'; end;`
+
+#### Enumerations
+- [ ] **Enum Types** - `type Color = (Red, Green, Blue);`
+- [ ] **Enum Variables** - Declaration and assignment
+- [ ] **Enum Operations** - Ord, Succ, Pred functions
+- [ ] **Enum Ranges** - `Red..Blue`
+
+#### Sets
+- [ ] **Set Types** - `set of Color`
+- [ ] **Set Operations** - Union (`+`), intersection (`*`), difference (`-`)
+- [ ] **Set Membership** - `in` operator
+- [ ] **Set Literals** - `[Red, Green]`
+
+### Phase 2: Enhanced Control Flow 🔄
+
+#### Case Statements
+- [ ] **Integer Case** - `case x of 1: ...; 2: ...; else ...; end;`
+- [ ] **Character Case** - Case on character values
+- [ ] **Enum Case** - Case on enumeration values
+- [ ] **String Case** - Case on string values (modern Pascal)
+- [ ] **Range Cases** - `1..5: ...;`
+
+#### Advanced Loops
+- [ ] **Repeat..Until** - `repeat ... until condition;`
+- [ ] **For..In Loops** - `for item in array do ...` (modern Pascal)
+- [ ] **Break Statement** - Exit loop early
+- [ ] **Continue Statement** - Skip to next iteration
+- [ ] **Exit Statement** - Exit from procedure/function
+
+### Phase 3: User-Defined Routines 📚
+
+#### Procedures
+- [ ] **Procedure Declaration** - `procedure DoSomething;`
+- [ ] **Parameters** - Value parameters (`x: Int`)
+- [ ] **Var Parameters** - Reference parameters (`var x: Int`)
+- [ ] **Const Parameters** - Read-only parameters (`const x: Int`)
+- [ ] **Local Variables** - Local var declarations
+- [ ] **Nested Procedures** - Procedures inside procedures
+
+#### Functions
+- [ ] **Function Declaration** - `function Add(a, b: Int): Int;`
+- [ ] **Return Values** - `Result` variable and explicit returns
+- [ ] **Function Calls** - In expressions and statements
+- [ ] **Recursive Functions** - Self-calling functions
+
+#### Advanced Routine Features
+- [ ] **Function Overloading** - Same name, different parameters
+- [ ] **Default Parameters** - `procedure Test(x: Int = 10);`
+- [ ] **Variable Parameters** - `array of const` support
+- [ ] **Inline Functions** - `inline` directive (modern Pascal)
+
+### Phase 4: Constants & Advanced Types 🔧
+
+#### Constants
+- [ ] **Typed Constants** - `const Pi: Float = 3.14159;`
+- [ ] **Untyped Constants** - `const MaxItems = 100;`
+- [ ] **Array Constants** - `const Colors: array[1..3] of String = ('Red', 'Green', 'Blue');`
+- [ ] **Record Constants** - Constant record initialization
+
+#### Pointers
+- [ ] **Pointer Types** - `^Int`, `Pointer`
+- [ ] **Pointer Operations** - `@` (address of), `^` (dereference)
+- [ ] **Dynamic Memory** - `New`, `Dispose`, `GetMem`, `FreeMem`
+- [ ] **Nil Pointer** - `nil` constant
+
+#### Advanced Types
+- [ ] **Type Aliases** - `type TInteger = Int;`
+- [ ] **Subrange Types** - `type TDigit = 0..9;`
+- [ ] **Variant Records** - Records with variant parts
+
+### Phase 5: String Enhancements 📝
+
+#### String Operations
+- [ ] **String Concatenation** - `+` operator for strings
+- [ ] **String Indexing** - `s[1]` for character access
+- [ ] **String Functions** - `Length`, `Copy`, `Pos`, `Delete`, `Insert`
+- [ ] **String Comparison** - Case-sensitive and case-insensitive
+- [ ] **String Formatting** - `Format` function
+- [ ] **String Interpolation** - Modern string formatting (if desired)
+
+#### Character Handling
+- [ ] **Char Type** - Single character type
+- [ ] **Character Functions** - `UpCase`, `Chr`, `Ord`
+- [ ] **Character Sets** - Character classification
+
+### Phase 6: File I/O & System 💾
+
+#### File Operations
+- [ ] **Text Files** - `TextFile` type and operations
+- [ ] **Binary Files** - `File` type for binary data
+- [ ] **File Functions** - `Assign`, `Reset`, `Rewrite`, `Close`
+- [ ] **File I/O** - `ReadLn`, `WriteLn`, `Read`, `Write` for files
+- [ ] **File Status** - `EOF`, `IOResult` functions
+
+#### System Functions
+- [ ] **Date/Time** - `Now`, `Date`, `Time` functions
+- [ ] **Math Functions** - `Sin`, `Cos`, `Sqrt`, `Abs`, `Round`, `Trunc`
+- [ ] **Random Numbers** - `Random`, `Randomize`
+- [ ] **System Info** - `ParamCount`, `ParamStr`
+
+### Phase 7: Error Handling 🛡️
+
+#### Exception Handling
+- [ ] **Try..Except** - `try ... except ... end;`
+- [ ] **Try..Finally** - `try ... finally ... end;`
+- [ ] **Raise Statement** - `raise Exception.Create('Error');`
+- [ ] **Exception Types** - Built-in exception hierarchy
+- [ ] **Exception Information** - Message, stack trace
+
+### Phase 8: Advanced Language Features 🚀
+
+#### Generics (Without Classes)
+- [ ] **Generic Procedures** - `procedure Test<T>(x: T);`
+- [ ] **Generic Functions** - `function Max<T>(a, b: T): T;`
+- [ ] **Generic Types** - `type TArray<T> = array of T;`
+- [ ] **Type Constraints** - Constraining generic parameters
+
+#### Anonymous Functions
+- [ ] **Anonymous Procedures** - `procedure(x: Int) begin ... end`
+- [ ] **Anonymous Functions** - `function(x: Int): Int begin Result := x * 2; end`
+- [ ] **Lambda Expressions** - Simplified syntax
+
+#### Modern Syntax
+- [ ] **Inline Variables** - `var x := 10;` (type inference)
+- [ ] **For..In with Index** - `for var i := Low(arr) to High(arr) do`
+- [ ] **Multiple Assignment** - If feasible
+- [ ] **String Case Insensitive** - Case statements on strings
+
+### Phase 9: Units & Modularity 📦
+
+#### Unit System
+- [ ] **Unit Declaration** - `unit MyUnit;`
+- [ ] **Interface Section** - Public declarations
+- [ ] **Implementation Section** - Private implementation
+- [ ] **Uses Clause** - Unit dependencies
+- [ ] **Unit Initialization** - Initialization/finalization sections
+
+#### Conditional Compilation
+- [ ] **Compiler Directives** - `{$IFDEF}`, `{$IFNDEF}`, `{$ELSE}`, `{$ENDIF}`
+- [ ] **Compiler Defines** - Built-in and custom defines
+- [ ] **Platform Directives** - Platform-specific compilation
+
+### Phase 10: Performance & Optimization ⚡
+
+#### Compiler Optimizations
+- [ ] **Constant Folding** - Compile-time expression evaluation
+- [ ] **Dead Code Elimination** - Remove unused code
+- [ ] **Inline Expansion** - Inline function calls
+- [ ] **Loop Optimizations** - Optimize loop constructs
+
+#### Native Compilation Enhancements
+- [ ] **Complete X64 Backend** - Full instruction set support
+- [ ] **Resource Embedding** - Embed compiled code in host executables
+- [ ] **Runtime Code Loading** - Load and execute machine code from files/resources
+- [ ] **Calling Convention Support** - Multiple calling conventions
+- [ ] **Host Integration** - Seamless integration with host applications
+
+---
+
+## 🎯 Development Priorities
+
+### Phase Priority Order
+1. **Phase 1 (Data Types)** - Foundation for complex programs
+2. **Phase 3 (User Routines)** - Essential for any real programming
+3. **Phase 2 (Control Flow)** - Enhanced program structure
+4. **Phase 4 (Constants/Types)** - Advanced type system
+5. **Phase 5 (Strings)** - Better text handling
+6. **Phase 6 (File I/O)** - System integration
+7. **Phase 7 (Exceptions)** - Robust error handling
+8. **Phase 8 (Advanced)** - Modern language features
+9. **Phase 9 (Units)** - Large program organization
+10. **Phase 10 (Optimization)** - Performance improvements
+
+### Immediate Next Steps (Recommendations)
+1. **Records** - Essential data structures (arrays mostly done)
+2. **User-defined Procedures/Functions** - Enable modular programming
+3. **Case Statements** - Common control structure
+4. **Advanced Array Operations** - Complete array functionality
+
+---
+
+## 📝 Notes
+
+### Design Decisions
+- **No OOP** - Focus on procedural/functional programming
+- **UTF-8 Strings** - Modern text handling
+- **Strong Typing** - Type safety with explicit conversions
+- **Modern Pascal Syntax** - Include beneficial modern features
+- **Performance** - Both bytecode VM and native compilation support
+
+### Testing Strategy
+- Add comprehensive tests for each new feature
+- Maintain existing test coverage
+- Performance benchmarks for major features
+- Cross-platform compatibility (where applicable)
+
+### Documentation
+- Update this TODO after each session
+- Document new language features
+- Provide examples for each feature
+- Maintain syntax reference
+
+---
+
+**Last Updated:** June 2025  
+**Current Focus:** Arrays implemented (core functionality working)  
+**Next Session:** Records/Structures or User-Defined Procedures