/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1989-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#include <exlib.h>
/*
* allocate a new expression program environment
*/
Expr_t*
exopen(register Exdisc_t* disc)
{
register Expr_t* program;
register Exid_t* sym;
int debug;
if (!(program = newof(0, Expr_t, 1, 0)))
return 0;
program->symdisc.key = offsetof(Exid_t, name);
debug = getenv("VMDEBUG") != 0;
if (!(program->symbols = dtopen(&program->symdisc, Dtset)) ||
!(program->tmp = sfstropen()) ||
!(program->vm = (debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK|VM_DBABORT) : vmopen(Vmdcheap, Vmbest, 0))) ||
!(program->ve = (debug ? vmopen(Vmdcsbrk, Vmdebug, VM_DBCHECK|VM_DBABORT) : vmopen(Vmdcheap, Vmbest, 0))))
{
exclose(program, 1);
return 0;
}
program->id = "libexpr:expr";
program->disc = disc;
setcontext(program);
program->file[0] = sfstdin;
program->file[1] = sfstdout;
program->file[2] = sfstderr;
strcpy(program->main.name, "main");
program->main.lex = PROCEDURE;
program->main.index = PROCEDURE;
dtinsert(program->symbols, &program->main);
if (!(disc->flags & EX_PURE))
for (sym = exbuiltin; *sym->name; sym++)
dtinsert(program->symbols, sym);
if (sym = disc->symbols)
for (; *sym->name; sym++)
dtinsert(program->symbols, sym);
return program;
}