Copyright (C) 2001 Michael Leonhard
Mike Leonhard
mike at tamale dot net
http://tamale.net/

Sebae Assembly v1 draft

The Sebae Assembly language closely mirrors the format of Sebae bytecode files.
Code in an assembly file is divided up into sections.  These sections are called
defns and correspond directly to the Sebae bytecode defns.  Sebae bytecode defns
are assigned an id based on their order of appearance the bytecode file.
Assembly defns are also assigned an id by their order of appearance in the 
assembly file.  The first defn has an id of 1, the second is 2, and so on.

Assembly directives are terminated by the `;' character.  Comments may be 
inserted into the assembly file.  A comment begins with two `/' characters and 
extends to a `\r' or `\n' character.  Comments may occur anywhere in the file.  
Comments are ignored along with the ` ', `\r', `\n', and `\t' characters.


Sebae Assembly directives:

DATA "filename";
	The DATA directive is optional.  If it is present then it must appear as
	the last directive in the file.  The data block for the bytecode program
	will be loaded from the specified file.  The specified filename must be 
	quoted with the `"' character.  If the DATA directive is absent, the 
	program will have an empty data block.
DEFN consume produce
	Begins a code defn.  The consume and produce values are positive 
	integers which specify the number of stack elements which the defn will 
	consume and produce.  A defn extends till it reaches a defn-terminal 
	instruction, HALT or JUMP.  The assembly sources must contain at least
	one valid defn specification.

Sebae instructions are followed by a semicolon.  Here is a list of the 
instructions.  Details may be found in bytecode.txt.

HALT;
JUMP 		element1;
LOADCODE 	element1;
VECTOR;
PUSH 		integer/float;
POP;
ASSIGN		element1 element2;
STACKSIZE;
STACKHEIGHT;
ADD		element1 element2;
FPADD		element1 element2;
SUBTRACT	element1 element2;
FPSUBTRACT	element1 element2;
MULTIPLY	element1 element2;
FPMULTIPLY	element1 element2;
DIVIDE		element1 element2;
FPDIVIDE	element1 element2;
REMAINDER	element1 element2;
FPREMAINDER	element1 element2;
GREATERTHAN	element1 element2;
FPGREATERTHAN	element1 element2;
AND		element1 element2;
OR		element1 element2;
XOR		element1 element2;
ROTATE		element1 element2;
EQUAL		element1 element2;
DECIDE 		element1 element2 element3;
LOAD		element1 element2;
SAVE		element1 element2;
MEMSIZE;