Write an IR Pretty-Printer and Round-Trip Parser

Your Task

Implement a pretty-printer and parser for your three-address code IR that support round-trip conversion.

Requirements

Pretty-Printer

1. Format instructions:

   • Binary ops: result = arg1 op arg2
   • Assignments: result = arg1
   • Labels: label_name:
   • Jumps: goto label
   • Conditional jumps: if condition goto label

2. Add structure:

   • Comments before each basic block
   • Blank lines between blocks
   • Consistent indentation

3. Output:

   • Write to file or stdout
   • Support human-readable format

Parser

1. Read instructions:

   • Ignore comments (lines starting with #)
   • Parse instruction format
   • Handle labels (ending with :)
   • Build IR data structures

2. Error handling:

   • Detect invalid syntax
   • Report line number of errors
   • Handle missing operands

3. Validation:

   • Check for required fields
   • Validate operator types
   • Ensure labels are defined

Round-Trip Test

1. Generate IR
2. Pretty-print to string
3. Parse string back to IR
4. Pretty-print again
5. Compare outputs

Success Criteria

• Printer outputs human-readable IR
• Parser reads printer output correctly
• Round-trip test passes (output matches)
• Handles all instruction types
• Good error messages for invalid input