Vmgen (Gforth 0.6.1)

Table of Contents

• Vmgen
• Introduction
• Why interpreters?
• Concepts
  • Front end and VM interpreter
  • Data handling
  • Dispatch
• Invoking Vmgen
• Example
  • Example overview
  • Using profiling to create superinstructions
• Input File Format
  • Input File Grammar
    • Eval escapes
  • Simple instructions
    • C Code Macros
    • C Code restrictions
    • Stack growth direction
  • Superinstructions
  • Store Optimization
  • Register Machines
• Error messages
• Using the generated code
  • VM engine
  • VM instruction table
  • VM code generation
  • Peephole optimization
  • VM disassembler
  • VM profiler
• Hints
  • Floating point
• The future
• Changes
• Contact
• Copying This Manual
  • GNU Free Documentation License
    • ADDENDUM: How to use this License for your documents
• Index

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Vmgen

Copyright © 2002, 03,2003 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with the Front-Cover texts being "A GNU Manual," and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled "GNU Free Documentation License."

(a) The FSF's Back-Cover Text is: "You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development."

• Introduction: What can Vmgen do for you?
• Why interpreters?: Advantages and disadvantages
• Concepts: VM interpreter background
• Invoking Vmgen:
• Example:
• Input File Format:
• Error messages: reported by Vmgen
• Using the generated code:
• Hints: VM archictecture, efficiency
• The future:
• Changes: from earlier versions
• Contact: Bug reporting etc.
• Copying This Manual: Manual License
• Index:

  --- The Detailed Node Listing ---

  Concepts

• Front end and VM interpreter: Modularizing an interpretive system
• Data handling: Stacks, registers, immediate arguments
• Dispatch: From one VM instruction to the next

  Example

• Example overview:
• Using profiling to create superinstructions:

  Input File Format

• Input File Grammar:
• Simple instructions:
• Superinstructions:
• Store Optimization:
• Register Machines: How to define register VM instructions

  Input File Grammar

• Eval escapes: what follows \E

  Simple instructions

• C Code Macros: Macros recognized by Vmgen
• C Code restrictions: Vmgen makes assumptions about C code
• Stack growth direction: is configurable per stack

  Using the generated code

• VM engine: Executing VM code
• VM instruction table:
• VM code generation: Creating VM code (in the front-end)
• Peephole optimization: Creating VM superinstructions
• VM disassembler: for debugging the front end
• VM profiler: for finding worthwhile superinstructions

  Hints

• Floating point: and stacks

  Copying This Manual

• GNU Free Documentation License: License for copying this manual.