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Implementing Subprograms

Handout:

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Outline

• Implementing Subprograms
• Implementing FORTRAN 77 Subprograms
  • FORTRAN Activation Info
• Activation Records
  • Implementing Subprograms in ALGOL-like Languages
  • Activation Record Structure
  • Activation Record Details
  • Example Factorial Program
    • Example Factorial Program (1)
    • Example Factorial Program (2)
    • Example Factorial Program (3)
    • Example Factorial Program (4)
    • Example Factorial Program (5)
  • The Dynamic Chain
• Accessing Nonlocal References
  • Nonlocal Refs: Static Scoping
    • Technique 1: Static Chains
      • Static Depth and Chain Offset
      • Static Chain Example
        • Static Chain Example (1)
        • Static Chain Example (2)
        • Static Chain Example (3)
        • Static Chain Example (4)
        • Static Chain Example (5)
        • Static Chain Example (6)
        • Static Chain Example (7)
        • Static Chain Example (8)
      • Static Chain Maintenance
      • Evaluation of Static Chains
    • Technique 2: Displays
      • Mechanics of Display References
    • Static Chain vs. Display
  • Implementing Blocks
  • Implementing Dynamic Scoping
• Subprograms as Parameters