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monoburg

Langue: en

Version: 112405 (mandriva - 01/05/08)

Section: 1 (Commandes utilisateur)

NAME

monoburg - code generator generator

SYNOPSIS

monoburg [-h] [-e] [-p] [-c VALUE] [-d HEADER] [-DVALUE] [FILE...]

DESCRIPTION

The monoburg program is used to generate tree pattern matchers from BURG specifications. monoburg accepts the following EBNF grammar.
 
spec: ccode `%%' { dcl } [`%%' ccode] dcl: `%start' nonterm `%term' { identifier [`=' integer] } `%termprefix' { identifier } nonterm `:' tree [cost] [ `{' ccode `}' ] [costfunc] tree: term `(' tree `,' tree `)' term `(' tree `)' term nonterm cost: `"' string '"' integer costfunc: `cost' `{' ccode `}'

 

Where ccode is arbitrary C code. cost and costfunc are used mutually exclusive, you can't use both in one rule. cost must be a C expression, whereas ccode inside costfunc is the body of a C function. Here are some example rules:

 
# define some terminal %term Fetch Four Mul Plus # this rule uses fixed costs addr: Plus (con, Mul (Four, reg)) 2 { printf ("Emit your code here."); } # this one computes costs inside a function reg: Fetch (addr) { printf ("Tree address is %p", tree); } cost { int c; c = 1; /* calculate the costs here */ return c; }

 

A simple pre-processor is included, consisting of: %ifdef, %else and %endif. %ifdef operates on definitions from the command line.

OPTIONS

The following options are supported:
-h
Displays usage instructions.
-d HEADER
Writes a separate header file which contains all monoburg definitions.
-p
Assume termainals are already defined. Its possible to omit the %term definitions in this mode if you use the %termprefix command. All symbols starting with a prefix specified in %termprefix are considered to be terminals.
-e
Extended mode. Enables monoburg to work with DAGs.
-c VALUE
Set the default costs to VALUE
-Dvar
Defines the variable "var" as true. This is used with %ifdef, %else and %endif in the source files to perform conditional compilation.

AUTHOR

monoburg was written by Dietmar Maurer. It is based on the papers from Christopher W. Fraser, Robert R. Henry and Todd A. Proebsting: "BURG - Fast Optimal Instruction Selection and Tree Parsing" and "Engineering a Simple, Efficient Code Generator Generator".

SEE ALSO

monodis(1) pedump(1)
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