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-<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
-<html>
-<head>
-   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
-   <meta name="Author" content="john sadler">
-   <meta name="Description" content="the coolest embedded scripting language ever">
-   <title>Ficl - Internals</title>
-</head>
-<body>
-<link REL="SHORTCUT ICON" href="ficl.ico">
-<h1><b>Ficl Internal Structures</b></h1>
-
-<script language="javascript" src="ficlheader.js"></script>
-
-<h2>Contents</h2>
-
-<h2>Major Data Structures</h2>
-<p>
-A running memory image of Ficl consists of one or more FICL_SYSTEMs, 
-each of which owns exactly one dictionary (FICL_DICT), 
-and one or more virtual machines (FICL_VM). Each VM owns two stacks
-(FICL_STACK) - one for parameters (the parameter stack) 
-and one for return addresses (the return stack). 
-Ficl is a permissive, untyped language by nature, 
-so its fundamental unit of storage is a CELL: a chunk of memory
-large enough to hold an address or a scalar type.
-</p>
-<h3>FICL_SYSTEM</h3>
-The system structure associates one or more virtual machines with a dictionary. All FICL_SYSTEMS
-include a link pointer that is used to keep track of every allocated system so that memory
-can be freed by ficlTermSystem. Each system contains a list of virtual machines associated with
-it. Each system has at least one virtual machine. In a typical implementation, there is one virtual
-machine per native OS thread, and there may be several VMs sharing a single FICL_SYSTEM, or one
-FICL_SYSTEM per VM if the implementation needs to support multiple user sessions in a robust way.
-
-A FICL_SYSTEM also includes a special dictionary for local variable support (if enabled 
-by FICL_WANT_LOCALS) and another for environment variable support. Environment variables 
-describe the configuration of the system in conformance with American National Standard Forth 
-(ANS Forth).
-<h3>FICL_DICT</h3>
-A dictionary manages a fixed-size block of contiguous memory. It serves two roles: to keep track 
-of allocated memory, and to collect symbol tables called wordlists. Each dictionary contains at
-least one wordlist. The dictionary organized memory (perhaps this is too kind) as an array of
-CELLs that grows from low memory to high memory within fixed limits determined by the 
-FICL_DEFAULT_DICT parameter in sysdep.h. 
-
-A wordlist is the controlling structure of a Ficl symbol table. Each wordlist is a hash table 
-containing pointers to FICL_WORDs. Each FICL_WORD associates a pointer to code with one or more
-CELLs of the dictionay. Each word usually has a name as well, but this is not required. It is
-possible to create anonymous words using :NONAME.
-
-Each word's code pointer determines that word's runtime behavior, and by implication the purpose
-of its payload data. Some words interpret their payload as a list of Ficl words, and execute them.
-This is how new behaviors of the language are defined. Other words view their payload field as
-a location in which one or more CELLs can be stored (VARIABLEs, for example). At runtime, such
-words push the address of their payload area onto the parameter stack.
-<h3>FICL_VM</h3>
-The virtual machine collects state related to execution of Ficl words. Each VM includes
-registers used by the inner interpreter, some state variables (AKA user variables) such as
-the current numeric base, and a jmpbuf.
-A VM has a pointer to the FICL_SYSTEM of which it is a part. It also has a pointer to an incoming 
-text string that it is interpreting. There are VM methods that excute a word given its address
-(xt), and ones that interpret a text string. 
-<h3>FICL_STACK</h3>
-Each VM owns a parameter stack, a return stack, and if float support is enabled, a float parameter
-stack. Parameters, return addresses, and floats are all CELL sized, and values may be
-moved back and forth among stacks using various Ficl words for that purpose.
-</BODY>
-</HTML>