mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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814 lines
21 KiB
C
814 lines
21 KiB
C
/*
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* build.c -- functions associated with building syntax diagrams.
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*
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* SOFTWARE RIGHTS
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*
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* We reserve no LEGAL rights to the Purdue Compiler Construction Tool
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* Set (PCCTS) -- PCCTS is in the public domain. An individual or
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* company may do whatever they wish with source code distributed with
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* PCCTS or the code generated by PCCTS, including the incorporation of
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* PCCTS, or its output, into commerical software.
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*
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* We encourage users to develop software with PCCTS. However, we do ask
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* that credit is given to us for developing PCCTS. By "credit",
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* we mean that if you incorporate our source code into one of your
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* programs (commercial product, research project, or otherwise) that you
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* acknowledge this fact somewhere in the documentation, research report,
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* etc... If you like PCCTS and have developed a nice tool with the
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* output, please mention that you developed it using PCCTS. In
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* addition, we ask that this header remain intact in our source code.
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* As long as these guidelines are kept, we expect to continue enhancing
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* this system and expect to make other tools available as they are
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* completed.
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*
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* ANTLR 1.33
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* Terence Parr
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* Parr Research Corporation
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* with Purdue University and AHPCRC, University of Minnesota
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* 1989-2001
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "pcctscfg.h"
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#include "set.h"
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#include "syn.h"
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#include "hash.h"
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#include "generic.h"
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#include "dlgdef.h"
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#define SetBlk(g, t, approx, first_set_symbol) { \
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((Junction *)g.left)->jtype = t; \
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((Junction *)g.left)->approx = approx; \
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((Junction *)g.left)->pFirstSetSymbol = first_set_symbol; \
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((Junction *)g.left)->end = (Junction *) g.right; \
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((Junction *)g.right)->jtype = EndBlk;}
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/* Add the parameter string 'parm' to the parms field of a block-type junction
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* g.left points to the sentinel node on a block. i.e. g.left->p1 points to
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* the actual junction with its jtype == some block-type.
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*/
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void
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#ifdef __USE_PROTOS
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addParm( Node *p, char *parm )
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#else
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addParm( p, parm )
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Node *p;
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char *parm;
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#endif
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{
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char *q = (char *) malloc( strlen(parm) + 1 );
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require(p!=NULL, "addParm: NULL object\n");
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require(q!=NULL, "addParm: unable to alloc parameter\n");
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strcpy(q, parm);
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if ( p->ntype == nRuleRef )
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{
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((RuleRefNode *)p)->parms = q;
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}
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else if ( p->ntype == nJunction )
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{
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((Junction *)p)->parm = q; /* only one parameter allowed on subrules */
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}
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else fatal_internal("addParm: invalid node for adding parm");
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}
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/*
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* Build an action node for the syntax diagram
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*
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* buildAction(ACTION) ::= --o-->ACTION-->o--
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*
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* Where o is a junction node.
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*/
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Graph
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#ifdef __USE_PROTOS
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buildAction( char *action, int file, int line, int is_predicate )
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#else
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buildAction( action, file, line, is_predicate )
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char *action;
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int file;
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int line;
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int is_predicate;
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#endif
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{
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Junction *j1, *j2;
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Graph g;
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ActionNode *a;
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require(action!=NULL, "buildAction: invalid action");
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j1 = newJunction();
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j2 = newJunction();
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a = newActionNode();
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a->action = (char *) malloc( strlen(action)+1 );
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require(a->action!=NULL, "buildAction: cannot alloc space for action\n");
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strcpy(a->action, action);
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j1->p1 = (Node *) a;
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a->next = (Node *) j2;
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a->is_predicate = is_predicate;
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if (is_predicate) {
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PredEntry *predEntry;
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char *t;
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char *key;
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char *u;
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int inverted=0;
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t=key=(char *)calloc(1,strlen(a->action)+1);
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for (u=a->action; *u != '\0' ; u++) {
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if (*u != ' ') {
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if (t==key && *u=='!') {
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inverted=!inverted;
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} else {
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*t++=*u;
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};
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};
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};
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*t='\0';
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predEntry=(PredEntry *)hash_get(Pname,key);
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a->predEntry=predEntry;
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if (predEntry != NULL) a->inverted=inverted;
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} else {
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/* MR12c */ char *strStart=a->action;
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/* MR12c */ char *strEnd;
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/* MR12c */ strEnd=strStart+strlen(strStart)-1;
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/* MR12c */ for ( ; strEnd >= strStart && isspace(*strEnd); strEnd--) *strEnd=0;
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/* MR12c */ while (*strStart != '\0' && isspace(*strStart)) strStart++;
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/* MR12c */ if (ci_strequ(strStart,"nohoist")) {
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/* MR12c */ a->noHoist=1;
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/* MR12c */ }
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}
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g.left = (Node *) j1; g.right = (Node *) j2;
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a->file = file;
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a->line = line;
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a->rname = CurRule; /* MR10 */
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return g;
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}
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/*
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* Build a token node for the syntax diagram
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*
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* buildToken(TOKEN) ::= --o-->TOKEN-->o--
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*
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* Where o is a junction node.
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*/
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Graph
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#ifdef __USE_PROTOS
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buildToken( char *text )
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#else
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buildToken( text )
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char *text;
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#endif
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{
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Junction *j1, *j2;
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Graph g;
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TokNode *t;
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require(text!=NULL, "buildToken: invalid token name");
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j1 = newJunction();
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j2 = newJunction();
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t = newTokNode();
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t->altstart = CurAltStart;
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if ( *text == '"' ) {t->label=FALSE; t->token = addTexpr( text );}
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else {t->label=TRUE; t->token = addTname( text );}
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j1->p1 = (Node *) t;
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t->next = (Node *) j2;
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g.left = (Node *) j1; g.right = (Node *) j2;
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return g;
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}
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/*
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* Build a wild-card node for the syntax diagram
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*
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* buildToken(TOKEN) ::= --o-->'.'-->o--
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*
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* Where o is a junction node.
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*/
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Graph
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#ifdef __USE_PROTOS
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buildWildCard( char *text )
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#else
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buildWildCard( text )
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char *text;
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#endif
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{
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Junction *j1, *j2;
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Graph g;
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TokNode *t;
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TCnode *w;
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TermEntry *p;
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require(text!=NULL, "buildWildCard: invalid token name");
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j1 = newJunction();
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j2 = newJunction();
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t = newTokNode();
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/* If the ref a wild card, make a token class for it */
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if ( Tnum(WildCardString) == 0 )
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{
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w = newTCnode;
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w->tok = addTname( WildCardString );
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set_orel(w->tok, &imag_tokens);
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set_orel(w->tok, &tokclasses);
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WildCardToken = w->tok;
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require((p=(TermEntry *)hash_get(Tname, WildCardString)) != NULL,
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"hash table mechanism is broken");
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p->classname = 1; /* entry is class name, not token */
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p->tclass = w; /* save ptr to this tclass def */
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list_add(&tclasses, (char *)w);
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}
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else {
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p=(TermEntry *)hash_get(Tname, WildCardString);
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require( p!= NULL, "hash table mechanism is broken");
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w = p->tclass;
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}
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t->token = w->tok;
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t->wild_card = 1;
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t->tclass = w;
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t->altstart = CurAltStart;
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j1->p1 = (Node *) t;
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t->next = (Node *) j2;
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g.left = (Node *) j1; g.right = (Node *) j2;
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return g;
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}
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void
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#ifdef __USE_PROTOS
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setUpperRange(TokNode *t, char *text)
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#else
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setUpperRange(t, text)
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TokNode *t;
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char *text;
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#endif
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{
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require(t!=NULL, "setUpperRange: NULL token node");
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require(text!=NULL, "setUpperRange: NULL token string");
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if ( *text == '"' ) {t->upper_range = addTexpr( text );}
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else {t->upper_range = addTname( text );}
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}
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/*
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* Build a rule reference node of the syntax diagram
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*
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* buildRuleRef(RULE) ::= --o-->RULE-->o--
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*
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* Where o is a junction node.
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*
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* If rule 'text' has been defined already, don't alloc new space to store string.
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* Set r->text to point to old copy in string table.
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*/
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Graph
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#ifdef __USE_PROTOS
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buildRuleRef( char *text )
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#else
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buildRuleRef( text )
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char *text;
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#endif
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{
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Junction *j1, *j2;
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Graph g;
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RuleRefNode *r;
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RuleEntry *p;
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require(text!=NULL, "buildRuleRef: invalid rule name");
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j1 = newJunction();
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j2 = newJunction();
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r = newRNode();
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r->altstart = CurAltStart;
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r->assign = NULL;
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if ( (p=(RuleEntry *)hash_get(Rname, text)) != NULL ) r->text = p->str;
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else r->text = mystrdup( text );
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j1->p1 = (Node *) r;
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r->next = (Node *) j2;
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g.left = (Node *) j1; g.right = (Node *) j2;
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return g;
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}
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/*
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* Or two subgraphs into one graph via:
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*
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* Or(G1, G2) ::= --o-G1-o--
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* | ^
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* v |
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* o-G2-o
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*
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* Set the altnum of junction starting G2 to 1 + altnum of junction starting G1.
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* If, however, the G1 altnum is 0, make it 1 and then
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* make G2 altnum = G1 altnum + 1.
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*/
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Graph
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#ifdef __USE_PROTOS
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Or( Graph g1, Graph g2 )
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#else
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Or( g1, g2 )
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Graph g1;
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Graph g2;
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#endif
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{
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Graph g;
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require(g1.left != NULL, "Or: invalid graph");
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require(g2.left != NULL && g2.right != NULL, "Or: invalid graph");
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((Junction *)g1.left)->p2 = g2.left;
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((Junction *)g2.right)->p1 = g1.right;
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/* set altnums */
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if ( ((Junction *)g1.left)->altnum == 0 ) ((Junction *)g1.left)->altnum = 1;
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((Junction *)g2.left)->altnum = ((Junction *)g1.left)->altnum + 1;
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g.left = g2.left;
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g.right = g1.right;
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return g;
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}
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/*
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* Catenate two subgraphs
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*
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* Cat(G1, G2) ::= --o-G1-o-->o-G2-o--
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* Cat(NULL,G2)::= --o-G2-o--
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* Cat(G1,NULL)::= --o-G1-o--
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*/
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Graph
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#ifdef __USE_PROTOS
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Cat( Graph g1, Graph g2 )
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#else
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Cat( g1, g2 )
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Graph g1;
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Graph g2;
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#endif
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{
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Graph g;
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if ( g1.left == NULL && g1.right == NULL ) return g2;
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if ( g2.left == NULL && g2.right == NULL ) return g1;
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((Junction *)g1.right)->p1 = g2.left;
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g.left = g1.left;
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g.right = g2.right;
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return g;
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}
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/*
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* Make a subgraph an optional block
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*
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* makeOpt(G) ::= --o-->o-G-o-->o--
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* | ^
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* v |
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* o-------o
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*
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* Note that this constructs {A|B|...|Z} as if (A|B|...|Z|) was found.
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*
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* The node on the far right is added so that every block owns its own
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* EndBlk node.
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*/
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Graph
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#ifdef __USE_PROTOS
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makeOpt( Graph g1, int approx, char * pFirstSetSymbol )
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#else
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makeOpt( g1, approx, pFirstSetSymbol )
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Graph g1;
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int approx;
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char * pFirstSetSymbol;
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#endif
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{
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Junction *j1,*j2,*p;
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Graph g;
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require(g1.left != NULL && g1.right != NULL, "makeOpt: invalid graph");
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j1 = newJunction();
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j2 = newJunction();
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((Junction *)g1.right)->p1 = (Node *) j2; /* add node to G at end */
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/* MR21
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*
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* There is code in genBlk which recognizes the node created
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* by emptyAlt() as a special case and bypasses it. We don't
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* want this to happen for the optBlk.
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*/
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g = emptyAlt3(); /* MR21 */
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if ( ((Junction *)g1.left)->altnum == 0 ) ((Junction *)g1.left)->altnum = 1;
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((Junction *)g.left)->altnum = ((Junction *)g1.left)->altnum + 1;
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for(p=(Junction *)g1.left; p->p2!=NULL; p=(Junction *)p->p2)
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{;} /* find last alt */
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p->p2 = g.left; /* add optional alternative */
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((Junction *)g.right)->p1 = (Node *)j2; /* opt alt points to EndBlk */
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g1.right = (Node *)j2;
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SetBlk(g1, aOptBlk, approx, pFirstSetSymbol);
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j1->p1 = g1.left; /* add generic node in front */
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g.left = (Node *) j1;
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g.right = g1.right;
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return g;
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}
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/*
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* Make a graph into subblock
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*
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* makeBlk(G) ::= --o-->o-G-o-->o--
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*
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* The node on the far right is added so that every block owns its own
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* EndBlk node.
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*/
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Graph
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#ifdef __USE_PROTOS
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makeBlk( Graph g1, int approx, char * pFirstSetSymbol )
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#else
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makeBlk( g1, approx, pFirstSetSymbol )
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Graph g1;
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int approx;
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char * pFirstSetSymbol;
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#endif
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{
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Junction *j,*j2;
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Graph g;
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require(g1.left != NULL && g1.right != NULL, "makeBlk: invalid graph");
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j = newJunction();
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j2 = newJunction();
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((Junction *)g1.right)->p1 = (Node *) j2; /* add node to G at end */
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g1.right = (Node *)j2;
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SetBlk(g1, aSubBlk, approx, pFirstSetSymbol);
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j->p1 = g1.left; /* add node in front */
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g.left = (Node *) j;
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g.right = g1.right;
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return g;
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}
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/*
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* Make a subgraph into a loop (closure) block -- (...)*
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*
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* makeLoop(G) ::= |---|
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* v |
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* --o-->o-->o-G-o-->o--
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* | ^
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* v |
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* o-----------o
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*
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* After making loop, always place generic node out front. It becomes
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* the start of enclosing block. The aLoopBlk is the target of the loop.
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*
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* Loop blks have TWO EndBlk nodes--the far right and the node that loops back
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* to the aLoopBlk node. Node with which we can branch past loop == aLoopBegin and
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* one which is loop target == aLoopBlk.
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* The branch-past (initial) aLoopBegin node has end
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* pointing to the last EndBlk node. The loop-target node has end==NULL.
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*
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* Loop blocks have a set of locks (from 1..CLL_k) on the aLoopBlk node.
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*/
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Graph
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#ifdef __USE_PROTOS
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makeLoop( Graph g1, int approx, char * pFirstSetSymbol )
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#else
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makeLoop( g1, approx, pFirstSetSymbol)
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Graph g1;
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int approx;
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char * pFirstSetSymbol;
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#endif
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{
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Junction *back, *front, *begin;
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Graph g;
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require(g1.left != NULL && g1.right != NULL, "makeLoop: invalid graph");
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back = newJunction();
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front = newJunction();
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begin = newJunction();
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g = emptyAlt3();
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((Junction *)g1.right)->p2 = g1.left; /* add loop branch to G */
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((Junction *)g1.right)->p1 = (Node *) back; /* add node to G at end */
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((Junction *)g1.right)->jtype = EndBlk; /* mark 1st EndBlk node */
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((Junction *)g1.left)->jtype = aLoopBlk; /* mark 2nd aLoopBlk node */
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((Junction *)g1.left)->end = (Junction *) g1.right;
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((Junction *)g1.left)->lock = makelocks();
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((Junction *)g1.left)->pred_lock = makelocks();
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g1.right = (Node *) back;
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begin->p1 = (Node *) g1.left;
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g1.left = (Node *) begin;
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begin->p2 = (Node *) g.left; /* make bypass arc */
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((Junction *)g.right)->p1 = (Node *) back;
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SetBlk(g1, aLoopBegin, approx, pFirstSetSymbol);
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front->p1 = g1.left; /* add node to front */
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g1.left = (Node *) front;
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return g1;
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}
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/*
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* Make a subgraph into a plus block -- (...)+ -- 1 or more times
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*
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* makePlus(G) ::= |---|
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* v |
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* --o-->o-G-o-->o--
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*
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|
* After making loop, always place generic node out front. It becomes
|
|
* the start of enclosing block. The aPlusBlk is the target of the loop.
|
|
*
|
|
* Plus blks have TWO EndBlk nodes--the far right and the node that loops back
|
|
* to the aPlusBlk node.
|
|
*
|
|
* Plus blocks have a set of locks (from 1..CLL_k) on the aPlusBlk node.
|
|
*/
|
|
Graph
|
|
#ifdef __USE_PROTOS
|
|
makePlus( Graph g1, int approx, char * pFirstSetSymbol)
|
|
#else
|
|
makePlus( g1, approx, pFirstSetSymbol)
|
|
Graph g1;
|
|
int approx;
|
|
char * pFirstSetSymbol;
|
|
#endif
|
|
{
|
|
int has_empty_alt_already = 0;
|
|
Graph g;
|
|
Junction *j2, *j3, *first_alt;
|
|
Junction *last_alt=NULL, *p;
|
|
require(g1.left != NULL && g1.right != NULL, "makePlus: invalid graph");
|
|
|
|
first_alt = (Junction *)g1.left;
|
|
j2 = newJunction();
|
|
j3 = newJunction();
|
|
if ( ((Junction *)g1.left)->altnum == 0 ) ((Junction *)g1.left)->altnum = 1;
|
|
((Junction *)g1.right)->p2 = g1.left; /* add loop branch to G */
|
|
((Junction *)g1.right)->p1 = (Node *) j2; /* add node to G at end */
|
|
((Junction *)g1.right)->jtype = EndBlk; /* mark 1st EndBlk node */
|
|
g1.right = (Node *) j2;
|
|
SetBlk(g1, aPlusBlk, approx, pFirstSetSymbol);
|
|
((Junction *)g1.left)->lock = makelocks();
|
|
((Junction *)g1.left)->pred_lock = makelocks();
|
|
j3->p1 = g1.left; /* add node to front */
|
|
g1.left = (Node *) j3;
|
|
|
|
/* add an optional branch which is the "exit" branch of loop */
|
|
/* FIRST, check to ensure that there does not already exist
|
|
* an optional path.
|
|
*/
|
|
/* find last alt */
|
|
for(p=first_alt; p!=NULL; p=(Junction *)p->p2)
|
|
{
|
|
if ( p->p1->ntype == nJunction &&
|
|
p->p1!=NULL &&
|
|
((Junction *)p->p1)->jtype==Generic &&
|
|
((Junction *)p->p1)->p1!=NULL &&
|
|
((Junction *)((Junction *)p->p1)->p1)->jtype==EndBlk )
|
|
{
|
|
has_empty_alt_already = 1;
|
|
}
|
|
last_alt = p;
|
|
}
|
|
if ( !has_empty_alt_already )
|
|
{
|
|
require(last_alt!=NULL, "last_alt==NULL; bad (..)+");
|
|
g = emptyAlt();
|
|
last_alt->p2 = g.left;
|
|
((Junction *)g.right)->p1 = (Node *) j2;
|
|
|
|
/* make sure lookahead computation ignores this alt for
|
|
* FIRST("(..)+"); but it's still used for computing the FIRST
|
|
* of each alternative.
|
|
*/
|
|
((Junction *)g.left)->ignore = 1;
|
|
}
|
|
|
|
return g1;
|
|
}
|
|
|
|
/*
|
|
* Return an optional path: --o-->o--
|
|
*/
|
|
|
|
Graph
|
|
#ifdef __USE_PROTOS
|
|
emptyAlt( void )
|
|
#else
|
|
emptyAlt( )
|
|
#endif
|
|
{
|
|
Junction *j1, *j2;
|
|
Graph g;
|
|
|
|
j1 = newJunction();
|
|
j2 = newJunction();
|
|
j1->p1 = (Node *) j2;
|
|
g.left = (Node *) j1;
|
|
g.right = (Node *) j2;
|
|
|
|
return g;
|
|
}
|
|
|
|
/* MR21
|
|
*
|
|
* There is code in genBlk which recognizes the node created
|
|
* by emptyAlt() as a special case and bypasses it. We don't
|
|
* want this to happen for the optBlk.
|
|
*/
|
|
|
|
Graph
|
|
#ifdef __USE_PROTOS
|
|
emptyAlt3( void )
|
|
#else
|
|
emptyAlt3( )
|
|
#endif
|
|
{
|
|
Junction *j1, *j2, *j3;
|
|
Graph g;
|
|
|
|
j1 = newJunction();
|
|
j2 = newJunction();
|
|
j3 = newJunction();
|
|
j1->p1 = (Node *) j2;
|
|
j2->p1 = (Node *) j3;
|
|
g.left = (Node *) j1;
|
|
g.right = (Node *) j3;
|
|
|
|
return g;
|
|
}
|
|
|
|
/* N o d e A l l o c a t i o n */
|
|
|
|
TokNode *
|
|
#ifdef __USE_PROTOS
|
|
newTokNode( void )
|
|
#else
|
|
newTokNode( )
|
|
#endif
|
|
{
|
|
static TokNode *FreeList = NULL;
|
|
TokNode *p, *newblk;
|
|
|
|
if ( FreeList == NULL )
|
|
{
|
|
newblk = (TokNode *)calloc(TokenBlockAllocSize, sizeof(TokNode));
|
|
if ( newblk == NULL )
|
|
fatal_internal(eMsg1("out of memory while building rule '%s'",CurRule));
|
|
for (p=newblk; p<&(newblk[TokenBlockAllocSize]); p++)
|
|
{
|
|
p->next = (Node *)FreeList; /* add all new token nodes to FreeList */
|
|
FreeList = p;
|
|
}
|
|
}
|
|
p = FreeList;
|
|
FreeList = (TokNode *)FreeList->next;/* remove a TokNode node */
|
|
p->next = NULL; /* NULL the ptr we used */
|
|
memset( (char *) p, 0, sizeof(TokNode)); /* MR10 */
|
|
p->ntype = nToken;
|
|
p->rname = CurRule;
|
|
p->file = CurFile;
|
|
p->line = zzline;
|
|
p->altstart = NULL;
|
|
|
|
return p;
|
|
}
|
|
|
|
RuleRefNode *
|
|
#ifdef __USE_PROTOS
|
|
newRNode( void )
|
|
#else
|
|
newRNode( )
|
|
#endif
|
|
{
|
|
static RuleRefNode *FreeList = NULL;
|
|
RuleRefNode *p, *newblk;
|
|
|
|
if ( FreeList == NULL )
|
|
{
|
|
newblk = (RuleRefNode *)calloc(RRefBlockAllocSize, sizeof(RuleRefNode));
|
|
if ( newblk == NULL )
|
|
fatal_internal(eMsg1("out of memory while building rule '%s'",CurRule));
|
|
for (p=newblk; p<&(newblk[RRefBlockAllocSize]); p++)
|
|
{
|
|
p->next = (Node *)FreeList; /* add all new rref nodes to FreeList */
|
|
FreeList = p;
|
|
}
|
|
}
|
|
p = FreeList;
|
|
FreeList = (RuleRefNode *)FreeList->next;/* remove a Junction node */
|
|
p->next = NULL; /* NULL the ptr we used */
|
|
memset( (char *) p, 0, sizeof(RuleRefNode)); /* MR10 */
|
|
p->ntype = nRuleRef;
|
|
p->rname = CurRule;
|
|
p->file = CurFile;
|
|
p->line = zzline;
|
|
p->astnode = ASTinclude;
|
|
p->altstart = NULL;
|
|
|
|
return p;
|
|
}
|
|
|
|
static int junctionSeqNumber=0; /* MR10 */
|
|
|
|
Junction *
|
|
#ifdef __USE_PROTOS
|
|
newJunction( void )
|
|
#else
|
|
newJunction( )
|
|
#endif
|
|
{
|
|
static Junction *FreeList = NULL;
|
|
Junction *p, *newblk;
|
|
|
|
if ( FreeList == NULL )
|
|
{
|
|
newblk = (Junction *)calloc(JunctionBlockAllocSize, sizeof(Junction));
|
|
if ( newblk == NULL )
|
|
fatal_internal(eMsg1("out of memory while building rule '%s'",CurRule));
|
|
for (p=newblk; p<&(newblk[JunctionBlockAllocSize]); p++)
|
|
{
|
|
p->p1 = (Node *)FreeList; /* add all new Junction nodes to FreeList */
|
|
FreeList = p;
|
|
}
|
|
}
|
|
p = FreeList;
|
|
FreeList = (Junction *)FreeList->p1;/* remove a Junction node */
|
|
p->p1 = NULL; /* NULL the ptr we used */
|
|
memset( (char *) p, 0, sizeof(Junction)); /* MR10 */
|
|
p->ntype = nJunction;
|
|
p->visited = 0;
|
|
p->jtype = Generic;
|
|
p->rname = CurRule;
|
|
p->file = CurFile;
|
|
p->line = zzline;
|
|
p->exception_label = NULL;
|
|
p->fset = (set *) calloc(CLL_k+1, sizeof(set));
|
|
require(p->fset!=NULL, "cannot allocate fset in newJunction");
|
|
p->seq=++junctionSeqNumber; /* MR10 */
|
|
|
|
return p;
|
|
}
|
|
|
|
ActionNode *
|
|
#ifdef __USE_PROTOS
|
|
newActionNode( void )
|
|
#else
|
|
newActionNode( )
|
|
#endif
|
|
{
|
|
static ActionNode *FreeList = NULL;
|
|
ActionNode *p, *newblk;
|
|
|
|
if ( FreeList == NULL )
|
|
{
|
|
newblk = (ActionNode *)calloc(ActionBlockAllocSize, sizeof(ActionNode));
|
|
if ( newblk == NULL )
|
|
fatal_internal(eMsg1("out of memory while building rule '%s'",CurRule));
|
|
for (p=newblk; p<&(newblk[ActionBlockAllocSize]); p++)
|
|
{
|
|
p->next = (Node *)FreeList; /* add all new Action nodes to FreeList */
|
|
FreeList = p;
|
|
}
|
|
}
|
|
p = FreeList;
|
|
FreeList = (ActionNode *)FreeList->next;/* remove an Action node */
|
|
memset( (char *) p, 0, sizeof(ActionNode)); /* MR10 */
|
|
p->ntype = nAction;
|
|
p->next = NULL; /* NULL the ptr we used */
|
|
p->done = 0;
|
|
p->pred_fail = NULL;
|
|
p->guardpred = NULL;
|
|
p->ampersandPred = NULL;
|
|
return p;
|
|
}
|
|
|
|
/*
|
|
* allocate the array of locks (1..CLL_k) used to inhibit infinite recursion.
|
|
* Infinite recursion can occur in (..)* blocks, FIRST calcs and FOLLOW calcs.
|
|
* Therefore, we need locks on aLoopBlk, RuleBlk, EndRule nodes.
|
|
*
|
|
* if ( lock[k]==TRUE ) then we have been here before looking for k tokens
|
|
* of lookahead.
|
|
*/
|
|
char *
|
|
#ifdef __USE_PROTOS
|
|
makelocks( void )
|
|
#else
|
|
makelocks( )
|
|
#endif
|
|
{
|
|
char *p = (char *) calloc(CLL_k+1, sizeof(char));
|
|
require(p!=NULL, "cannot allocate lock array");
|
|
|
|
return p;
|
|
}
|
|
|
|
#if 0
|
|
** #ifdef __USE_PROTOS
|
|
** void my_memset(char *p,char value,int count)
|
|
** #else
|
|
** void my_memset(p,value,count)
|
|
** char *p;
|
|
** char value;
|
|
** int count;
|
|
** #endif
|
|
** {
|
|
** int i;
|
|
**
|
|
** for (i=0; i<count; i++) {
|
|
** p[i]=value;
|
|
** };
|
|
** }
|
|
#endif
|