/*- * Copyright (c) 1980, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tree.h 8.1 (Berkeley) 6/6/93 */ /* * This file contains the declarations of the variables and routines * within the "tree" subdirectory that are accessible from outside. */ #include "tree/opinfo.h" /* * Evaluation stack manipulation macros. These are publically * available because "eval" leaves it's result on the stack. * * These macros allow one to operate on stacks of arbitrary types * (including a stack of different typed objects). * * Sadly, underflow and overflow are not checked for. */ typedef char STACK; #define WMASK (sizeof(int) - 1) #ifdef tahoe #define push(type, value) ((*(type *)sp) = value, sp += (sizeof(type) + WMASK) & ~WMASK, value) #define pop(type) (sp -= (sizeof(type) + WMASK) & ~WMASK, (*((type *) sp))) #else #define push(type, value) ((type *) (sp += sizeof(type)))[-1] = (value) #define pop(type) (*((type *) (sp -= sizeof(type)))) #endif #define alignstack() sp = (char *) (( ((int) sp) + WMASK)&~WMASK) #define downalignstack() sp = (char *) (( ((int) sp))&~WMASK) STACK stack[]; STACK *sp; NODE *build(); /* create a node in the parse tree */ int prtree(); /* print a tree in source form */ int eval(); /* evaluate a tree, leaving value on stack */ long popsmall(); /* pop a small item from the stack given its type */ int tfree(); /* release storage for a tree */ BOOLEAN tr_equal(); /* test if two trees are structurally equivalent */ BOOLEAN cond(); /* evaluate a node for a conditional */ ADDRESS lval(); /* return the object address of a node */ BOOLEAN isredirected(); /* TRUE if output is being redirected */