/* ** This file contains all sources (including headers) to the LEMON ** LALR(1) parser generator. The sources have been combined into a ** single file to make it easy to include LEMON in the source tree ** and Makefile of another program. ** ** The author of this program disclaims copyright. */ #include #include #include #include #include #ifndef __WIN32__ # if defined(_WIN32) || defined(WIN32) # define __WIN32__ # endif #endif /* #define PRIVATE static */ #define PRIVATE #ifdef TEST #define MAXRHS 5 /* Set low to exercise exception code */ #else #define MAXRHS 1000 #endif char *msort(); extern void *malloc(); /******** From the file "action.h" *************************************/ struct action *Action_new(); struct action *Action_sort(); /********* From the file "assert.h" ************************************/ void myassert(); #ifndef NDEBUG # define assert(X) if(!(X))myassert(__FILE__,__LINE__) #else # define assert(X) #endif /********** From the file "build.h" ************************************/ void FindRulePrecedences(); void FindFirstSets(); void FindStates(); void FindLinks(); void FindFollowSets(); void FindActions(); /********* From the file "configlist.h" *********************************/ void Configlist_init(/* void */); struct config *Configlist_add(/* struct rule *, int */); struct config *Configlist_addbasis(/* struct rule *, int */); void Configlist_closure(/* void */); void Configlist_sort(/* void */); void Configlist_sortbasis(/* void */); struct config *Configlist_return(/* void */); struct config *Configlist_basis(/* void */); void Configlist_eat(/* struct config * */); void Configlist_reset(/* void */); /********* From the file "error.h" ***************************************/ void ErrorMsg(const char *, int,const char *, ...); /****** From the file "option.h" ******************************************/ struct s_options { enum { OPT_FLAG=1, OPT_INT, OPT_DBL, OPT_STR, OPT_FFLAG, OPT_FINT, OPT_FDBL, OPT_FSTR} type; char *label; char *arg; char *message; }; int OptInit(/* char**,struct s_options*,FILE* */); int OptNArgs(/* void */); char *OptArg(/* int */); void OptErr(/* int */); void OptPrint(/* void */); /******** From the file "parse.h" *****************************************/ void Parse(/* struct lemon *lemp */); /********* From the file "plink.h" ***************************************/ struct plink *Plink_new(/* void */); void Plink_add(/* struct plink **, struct config * */); void Plink_copy(/* struct plink **, struct plink * */); void Plink_delete(/* struct plink * */); /********** From the file "report.h" *************************************/ void Reprint(/* struct lemon * */); void ReportOutput(/* struct lemon * */); void ReportTable(/* struct lemon * */); void ReportHeader(/* struct lemon * */); void CompressTables(/* struct lemon * */); void ResortStates(/* struct lemon * */); /********** From the file "set.h" ****************************************/ void SetSize(/* int N */); /* All sets will be of size N */ char *SetNew(/* void */); /* A new set for element 0..N */ void SetFree(/* char* */); /* Deallocate a set */ int SetAdd(/* char*,int */); /* Add element to a set */ int SetUnion(/* char *A,char *B */); /* A <- A U B, thru element N */ #define SetFind(X,Y) (X[Y]) /* True if Y is in set X */ /********** From the file "struct.h" *************************************/ /* ** Principal data structures for the LEMON parser generator. */ typedef enum {B_FALSE=0, B_TRUE} Boolean; /* Symbols (terminals and nonterminals) of the grammar are stored ** in the following: */ struct symbol { char *name; /* Name of the symbol */ int index; /* Index number for this symbol */ enum { TERMINAL, NONTERMINAL, MULTITERMINAL } type; /* Symbols are all either TERMINALS or NTs */ struct rule *rule; /* Linked list of rules of this (if an NT) */ struct symbol *fallback; /* fallback token in case this token doesn't parse */ int prec; /* Precedence if defined (-1 otherwise) */ enum e_assoc { LEFT, RIGHT, NONE, UNK } assoc; /* Associativity if predecence is defined */ char *firstset; /* First-set for all rules of this symbol */ Boolean lambda; /* True if NT and can generate an empty string */ char *destructor; /* Code which executes whenever this symbol is ** popped from the stack during error processing */ int destructorln; /* Line number of destructor code */ char *datatype; /* The data type of information held by this ** object. Only used if type==NONTERMINAL */ int dtnum; /* The data type number. In the parser, the value ** stack is a union. The .yy%d element of this ** union is the correct data type for this object */ /* The following fields are used by MULTITERMINALs only */ int nsubsym; /* Number of constituent symbols in the MULTI */ struct symbol **subsym; /* Array of constituent symbols */ }; /* Each production rule in the grammar is stored in the following ** structure. */ struct rule { struct symbol *lhs; /* Left-hand side of the rule */ char *lhsalias; /* Alias for the LHS (NULL if none) */ int ruleline; /* Line number for the rule */ int nrhs; /* Number of RHS symbols */ struct symbol **rhs; /* The RHS symbols */ char **rhsalias; /* An alias for each RHS symbol (NULL if none) */ int line; /* Line number at which code begins */ char *code; /* The code executed when this rule is reduced */ struct symbol *precsym; /* Precedence symbol for this rule */ int index; /* An index number for this rule */ Boolean canReduce; /* True if this rule is ever reduced */ struct rule *nextlhs; /* Next rule with the same LHS */ struct rule *next; /* Next rule in the global list */ }; /* A configuration is a production rule of the grammar together with ** a mark (dot) showing how much of that rule has been processed so far. ** Configurations also contain a follow-set which is a list of terminal ** symbols which are allowed to immediately follow the end of the rule. ** Every configuration is recorded as an instance of the following: */ struct config { struct rule *rp; /* The rule upon which the configuration is based */ int dot; /* The parse point */ char *fws; /* Follow-set for this configuration only */ struct plink *fplp; /* Follow-set forward propagation links */ struct plink *bplp; /* Follow-set backwards propagation links */ struct state *stp; /* Pointer to state which contains this */ enum { COMPLETE, /* The status is used during followset and */ INCOMPLETE /* shift computations */ } status; struct config *next; /* Next configuration in the state */ struct config *bp; /* The next basis configuration */ }; /* Every shift or reduce operation is stored as one of the following */ struct action { struct symbol *sp; /* The look-ahead symbol */ enum e_action { SHIFT, ACCEPT, REDUCE, ERROR, CONFLICT, /* Was a reduce, but part of a conflict */ SH_RESOLVED, /* Was a shift. Precedence resolved conflict */ RD_RESOLVED, /* Was reduce. Precedence resolved conflict */ NOT_USED /* Deleted by compression */ } type; union { struct state *stp; /* The new state, if a shift */ struct rule *rp; /* The rule, if a reduce */ } x; struct action *next; /* Next action for this state */ struct action *collide; /* Next action with the same hash */ }; /* Each state of the generated parser's finite state machine ** is encoded as an instance of the following structure. */ struct state { struct config *bp; /* The basis configurations for this state */ struct config *cfp; /* All configurations in this set */ int statenum; /* Sequencial number for this state */ struct action *ap; /* Array of actions for this state */ int nTknAct, nNtAct; /* Number of actions on terminals and nonterminals */ int iTknOfst, iNtOfst; /* yy_action[] offset for terminals and nonterms */ int iDflt; /* Default action */ }; #define NO_OFFSET (-2147483647) /* A followset propagation link indicates that the contents of one ** configuration followset should be propagated to another whenever ** the first changes. */ struct plink { struct config *cfp; /* The configuration to which linked */ struct plink *next; /* The next propagate link */ }; /* The state vector for the entire parser generator is recorded as ** follows. (LEMON uses no global variables and makes little use of ** static variables. Fields in the following structure can be thought ** of as begin global variables in the program.) */ struct lemon { struct state **sorted; /* Table of states sorted by state number */ struct rule *rule; /* List of all rules */ int nstate; /* Number of states */ int nrule; /* Number of rules */ int nsymbol; /* Number of terminal and nonterminal symbols */ int nterminal; /* Number of terminal symbols */ struct symbol **symbols; /* Sorted array of pointers to symbols */ int errorcnt; /* Number of errors */ struct symbol *errsym; /* The error symbol */ struct symbol *wildcard; /* Token that matches anything */ char *name; /* Name of the generated parser */ char *arg; /* Declaration of the 3th argument to parser */ char *tokentype; /* Type of terminal symbols in the parser stack */ char *vartype; /* The default type of non-terminal symbols */ char *start; /* Name of the start symbol for the grammar */ char *stacksize; /* Size of the parser stack */ char *include; /* Code to put at the start of the C file */ int includeln; /* Line number for start of include code */ char *error; /* Code to execute when an error is seen */ int errorln; /* Line number for start of error code */ char *overflow; /* Code to execute on a stack overflow */ int overflowln; /* Line number for start of overflow code */ char *failure; /* Code to execute on parser failure */ int failureln; /* Line number for start of failure code */ char *accept; /* Code to execute when the parser excepts */ int acceptln; /* Line number for the start of accept code */ char *extracode; /* Code appended to the generated file */ int extracodeln; /* Line number for the start of the extra code */ char *tokendest; /* Code to execute to destroy token data */ int tokendestln; /* Line number for token destroyer code */ char *vardest; /* Code for the default non-terminal destructor */ int vardestln; /* Line number for default non-term destructor code*/ char *filename; /* Name of the input file */ char *outname; /* Name of the current output file */ char *tokenprefix; /* A prefix added to token names in the .h file */ int nconflict; /* Number of parsing conflicts */ int tablesize; /* Size of the parse tables */ int basisflag; /* Print only basis configurations */ int has_fallback; /* True if any %fallback is seen in the grammer */ char *argv0; /* Name of the program */ }; #define MemoryCheck(X) if((X)==0){ \ extern void memory_error(); \ memory_error(); \ } /**************** From the file "table.h" *********************************/ /* ** All code in this file has been automatically generated ** from a specification in the file ** "table.q" ** by the associative array code building program "aagen". ** Do not edit this file! Instead, edit the specification ** file, then rerun aagen. */ /* ** Code for processing tables in the LEMON parser generator. */ /* Routines for handling a strings */ char *Strsafe(); void Strsafe_init(/* void */); int Strsafe_insert(/* char * */); char *Strsafe_find(/* char * */); /* Routines for handling symbols of the grammar */ struct symbol *Symbol_new(); int Symbolcmpp(/* struct symbol **, struct symbol ** */); void Symbol_init(/* void */); int Symbol_insert(/* struct symbol *, char * */); struct symbol *Symbol_find(/* char * */); struct symbol *Symbol_Nth(/* int */); int Symbol_count(/* */); struct symbol **Symbol_arrayof(/* */); /* Routines to manage the state table */ int Configcmp(/* struct config *, struct config * */); struct state *State_new(); void State_init(/* void */); int State_insert(/* struct state *, struct config * */); struct state *State_find(/* struct config * */); struct state **State_arrayof(/* */); /* Routines used for efficiency in Configlist_add */ void Configtable_init(/* void */); int Configtable_insert(/* struct config * */); struct config *Configtable_find(/* struct config * */); void Configtable_clear(/* int(*)(struct config *) */); /****************** From the file "action.c" *******************************/ /* ** Routines processing parser actions in the LEMON parser generator. */ /* Allocate a new parser action */ struct action *Action_new(){ static struct action *freelist = 0; struct action *new; if( freelist==0 ){ int i; int amt = 100; freelist = (struct action *)malloc( sizeof(struct action)*amt ); if( freelist==0 ){ fprintf(stderr,"Unable to allocate memory for a new parser action."); exit(1); } for(i=0; inext; return new; } /* Compare two actions */ static int actioncmp(ap1,ap2) struct action *ap1; struct action *ap2; { int rc; rc = ap1->sp->index - ap2->sp->index; if( rc==0 ) rc = (int)ap1->type - (int)ap2->type; if( rc==0 ){ assert( ap1->type==REDUCE || ap1->type==RD_RESOLVED || ap1->type==CONFLICT); assert( ap2->type==REDUCE || ap2->type==RD_RESOLVED || ap2->type==CONFLICT); rc = ap1->x.rp->index - ap2->x.rp->index; } return rc; } /* Sort parser actions */ struct action *Action_sort(ap) struct action *ap; { ap = (struct action *)msort((char *)ap,(char **)&ap->next,actioncmp); return ap; } void Action_add(app,type,sp,arg) struct action **app; enum e_action type; struct symbol *sp; char *arg; { struct action *new; new = Action_new(); new->next = *app; *app = new; new->type = type; new->sp = sp; if( type==SHIFT ){ new->x.stp = (struct state *)arg; }else{ new->x.rp = (struct rule *)arg; } } /********************** New code to implement the "acttab" module ***********/ /* ** This module implements routines use to construct the yy_action[] table. */ /* ** The state of the yy_action table under construction is an instance of ** the following structure */ typedef struct acttab acttab; struct acttab { int nAction; /* Number of used slots in aAction[] */ int nActionAlloc; /* Slots allocated for aAction[] */ struct { int lookahead; /* Value of the lookahead token */ int action; /* Action to take on the given lookahead */ } *aAction, /* The yy_action[] table under construction */ *aLookahead; /* A single new transaction set */ int mnLookahead; /* Minimum aLookahead[].lookahead */ int mnAction; /* Action associated with mnLookahead */ int mxLookahead; /* Maximum aLookahead[].lookahead */ int nLookahead; /* Used slots in aLookahead[] */ int nLookaheadAlloc; /* Slots allocated in aLookahead[] */ }; /* Return the number of entries in the yy_action table */ #define acttab_size(X) ((X)->nAction) /* The value for the N-th entry in yy_action */ #define acttab_yyaction(X,N) ((X)->aAction[N].action) /* The value for the N-th entry in yy_lookahead */ #define acttab_yylookahead(X,N) ((X)->aAction[N].lookahead) /* Free all memory associated with the given acttab */ void acttab_free(acttab *p){ free( p->aAction ); free( p->aLookahead ); free( p ); } /* Allocate a new acttab structure */ acttab *acttab_alloc(void){ acttab *p = malloc( sizeof(*p) ); if( p==0 ){ fprintf(stderr,"Unable to allocate memory for a new acttab."); exit(1); } memset(p, 0, sizeof(*p)); return p; } /* Add a new action to the current transaction set */ void acttab_action(acttab *p, int lookahead, int action){ if( p->nLookahead>=p->nLookaheadAlloc ){ p->nLookaheadAlloc += 25; p->aLookahead = realloc( p->aLookahead, sizeof(p->aLookahead[0])*p->nLookaheadAlloc ); if( p->aLookahead==0 ){ fprintf(stderr,"malloc failed\n"); exit(1); } } if( p->nLookahead==0 ){ p->mxLookahead = lookahead; p->mnLookahead = lookahead; p->mnAction = action; }else{ if( p->mxLookaheadmxLookahead = lookahead; if( p->mnLookahead>lookahead ){ p->mnLookahead = lookahead; p->mnAction = action; } } p->aLookahead[p->nLookahead].lookahead = lookahead; p->aLookahead[p->nLookahead].action = action; p->nLookahead++; } /* ** Add the transaction set built up with prior calls to acttab_action() ** into the current action table. Then reset the transaction set back ** to an empty set in preparation for a new round of acttab_action() calls. ** ** Return the offset into the action table of the new transaction. */ int acttab_insert(acttab *p){ int i, j, k, n; assert( p->nLookahead>0 ); /* Make sure we have enough space to hold the expanded action table ** in the worst case. The worst case occurs if the transaction set ** must be appended to the current action table */ n = p->mxLookahead + 1; if( p->nAction + n >= p->nActionAlloc ){ int oldAlloc = p->nActionAlloc; p->nActionAlloc = p->nAction + n + p->nActionAlloc + 20; p->aAction = realloc( p->aAction, sizeof(p->aAction[0])*p->nActionAlloc); if( p->aAction==0 ){ fprintf(stderr,"malloc failed\n"); exit(1); } for(i=oldAlloc; inActionAlloc; i++){ p->aAction[i].lookahead = -1; p->aAction[i].action = -1; } } /* Scan the existing action table looking for an offset where we can ** insert the current transaction set. Fall out of the loop when that ** offset is found. In the worst case, we fall out of the loop when ** i reaches p->nAction, which means we append the new transaction set. ** ** i is the index in p->aAction[] where p->mnLookahead is inserted. */ for(i=0; inAction+p->mnLookahead; i++){ if( p->aAction[i].lookahead<0 ){ for(j=0; jnLookahead; j++){ k = p->aLookahead[j].lookahead - p->mnLookahead + i; if( k<0 ) break; if( p->aAction[k].lookahead>=0 ) break; } if( jnLookahead ) continue; for(j=0; jnAction; j++){ if( p->aAction[j].lookahead==j+p->mnLookahead-i ) break; } if( j==p->nAction ){ break; /* Fits in empty slots */ } }else if( p->aAction[i].lookahead==p->mnLookahead ){ if( p->aAction[i].action!=p->mnAction ) continue; for(j=0; jnLookahead; j++){ k = p->aLookahead[j].lookahead - p->mnLookahead + i; if( k<0 || k>=p->nAction ) break; if( p->aLookahead[j].lookahead!=p->aAction[k].lookahead ) break; if( p->aLookahead[j].action!=p->aAction[k].action ) break; } if( jnLookahead ) continue; n = 0; for(j=0; jnAction; j++){ if( p->aAction[j].lookahead<0 ) continue; if( p->aAction[j].lookahead==j+p->mnLookahead-i ) n++; } if( n==p->nLookahead ){ break; /* Same as a prior transaction set */ } } } /* Insert transaction set at index i. */ for(j=0; jnLookahead; j++){ k = p->aLookahead[j].lookahead - p->mnLookahead + i; p->aAction[k] = p->aLookahead[j]; if( k>=p->nAction ) p->nAction = k+1; } p->nLookahead = 0; /* Return the offset that is added to the lookahead in order to get the ** index into yy_action of the action */ return i - p->mnLookahead; } /********************** From the file "assert.c" ****************************/ /* ** A more efficient way of handling assertions. */ void myassert(file,line) char *file; int line; { fprintf(stderr,"Assertion failed on line %d of file \"%s\"\n",line,file); exit(1); } /********************** From the file "build.c" *****************************/ /* ** Routines to construction the finite state machine for the LEMON ** parser generator. */ /* Find a precedence symbol of every rule in the grammar. ** ** Those rules which have a precedence symbol coded in the input ** grammar using the "[symbol]" construct will already have the ** rp->precsym field filled. Other rules take as their precedence ** symbol the first RHS symbol with a defined precedence. If there ** are not RHS symbols with a defined precedence, the precedence ** symbol field is left blank. */ void FindRulePrecedences(xp) struct lemon *xp; { struct rule *rp; for(rp=xp->rule; rp; rp=rp->next){ if( rp->precsym==0 ){ int i, j; for(i=0; inrhs && rp->precsym==0; i++){ struct symbol *sp = rp->rhs[i]; if( sp->type==MULTITERMINAL ){ for(j=0; jnsubsym; j++){ if( sp->subsym[j]->prec>=0 ){ rp->precsym = sp->subsym[j]; break; } } }else if( sp->prec>=0 ){ rp->precsym = rp->rhs[i]; } } } } return; } /* Find all nonterminals which will generate the empty string. ** Then go back and compute the first sets of every nonterminal. ** The first set is the set of all terminal symbols which can begin ** a string generated by that nonterminal. */ void FindFirstSets(lemp) struct lemon *lemp; { int i, j; struct rule *rp; int progress; for(i=0; insymbol; i++){ lemp->symbols[i]->lambda = B_FALSE; } for(i=lemp->nterminal; insymbol; i++){ lemp->symbols[i]->firstset = SetNew(); } /* First compute all lambdas */ do{ progress = 0; for(rp=lemp->rule; rp; rp=rp->next){ if( rp->lhs->lambda ) continue; for(i=0; inrhs; i++){ struct symbol *sp = rp->rhs[i]; if( sp->type!=TERMINAL || sp->lambda==B_FALSE ) break; } if( i==rp->nrhs ){ rp->lhs->lambda = B_TRUE; progress = 1; } } }while( progress ); /* Now compute all first sets */ do{ struct symbol *s1, *s2; progress = 0; for(rp=lemp->rule; rp; rp=rp->next){ s1 = rp->lhs; for(i=0; inrhs; i++){ s2 = rp->rhs[i]; if( s2->type==TERMINAL ){ progress += SetAdd(s1->firstset,s2->index); break; }else if( s2->type==MULTITERMINAL ){ for(j=0; jnsubsym; j++){ progress += SetAdd(s1->firstset,s2->subsym[j]->index); } break; }else if( s1==s2 ){ if( s1->lambda==B_FALSE ) break; }else{ progress += SetUnion(s1->firstset,s2->firstset); if( s2->lambda==B_FALSE ) break; } } } }while( progress ); return; } /* Compute all LR(0) states for the grammar. Links ** are added to between some states so that the LR(1) follow sets ** can be computed later. */ PRIVATE struct state *getstate(/* struct lemon * */); /* forward reference */ void FindStates(lemp) struct lemon *lemp; { struct symbol *sp; struct rule *rp; Configlist_init(); /* Find the start symbol */ if( lemp->start ){ sp = Symbol_find(lemp->start); if( sp==0 ){ ErrorMsg(lemp->filename,0, "The specified start symbol \"%s\" is not \ in a nonterminal of the grammar. \"%s\" will be used as the start \ symbol instead.",lemp->start,lemp->rule->lhs->name); lemp->errorcnt++; sp = lemp->rule->lhs; } }else{ sp = lemp->rule->lhs; } /* Make sure the start symbol doesn't occur on the right-hand side of ** any rule. Report an error if it does. (YACC would generate a new ** start symbol in this case.) */ for(rp=lemp->rule; rp; rp=rp->next){ int i; for(i=0; inrhs; i++){ if( rp->rhs[i]==sp ){ /* FIX ME: Deal with multiterminals */ ErrorMsg(lemp->filename,0, "The start symbol \"%s\" occurs on the \ right-hand side of a rule. This will result in a parser which \ does not work properly.",sp->name); lemp->errorcnt++; } } } /* The basis configuration set for the first state ** is all rules which have the start symbol as their ** left-hand side */ for(rp=sp->rule; rp; rp=rp->nextlhs){ struct config *newcfp; newcfp = Configlist_addbasis(rp,0); SetAdd(newcfp->fws,0); } /* Compute the first state. All other states will be ** computed automatically during the computation of the first one. ** The returned pointer to the first state is not used. */ (void)getstate(lemp); return; } /* Return a pointer to a state which is described by the configuration ** list which has been built from calls to Configlist_add. */ PRIVATE void buildshifts(/* struct lemon *, struct state * */); /* Forwd ref */ PRIVATE struct state *getstate(lemp) struct lemon *lemp; { struct config *cfp, *bp; struct state *stp; /* Extract the sorted basis of the new state. The basis was constructed ** by prior calls to "Configlist_addbasis()". */ Configlist_sortbasis(); bp = Configlist_basis(); /* Get a state with the same basis */ stp = State_find(bp); if( stp ){ /* A state with the same basis already exists! Copy all the follow-set ** propagation links from the state under construction into the ** preexisting state, then return a pointer to the preexisting state */ struct config *x, *y; for(x=bp, y=stp->bp; x && y; x=x->bp, y=y->bp){ Plink_copy(&y->bplp,x->bplp); Plink_delete(x->fplp); x->fplp = x->bplp = 0; } cfp = Configlist_return(); Configlist_eat(cfp); }else{ /* This really is a new state. Construct all the details */ Configlist_closure(lemp); /* Compute the configuration closure */ Configlist_sort(); /* Sort the configuration closure */ cfp = Configlist_return(); /* Get a pointer to the config list */ stp = State_new(); /* A new state structure */ MemoryCheck(stp); stp->bp = bp; /* Remember the configuration basis */ stp->cfp = cfp; /* Remember the configuration closure */ stp->statenum = lemp->nstate++; /* Every state gets a sequence number */ stp->ap = 0; /* No actions, yet. */ State_insert(stp,stp->bp); /* Add to the state table */ buildshifts(lemp,stp); /* Recursively compute successor states */ } return stp; } /* ** Return true if two symbols are the same. */ int same_symbol(a,b) struct symbol *a; struct symbol *b; { int i; if( a==b ) return 1; if( a->type!=MULTITERMINAL ) return 0; if( b->type!=MULTITERMINAL ) return 0; if( a->nsubsym!=b->nsubsym ) return 0; for(i=0; insubsym; i++){ if( a->subsym[i]!=b->subsym[i] ) return 0; } return 1; } /* Construct all successor states to the given state. A "successor" ** state is any state which can be reached by a shift action. */ PRIVATE void buildshifts(lemp,stp) struct lemon *lemp; struct state *stp; /* The state from which successors are computed */ { struct config *cfp; /* For looping thru the config closure of "stp" */ struct config *bcfp; /* For the inner loop on config closure of "stp" */ struct config *new; /* */ struct symbol *sp; /* Symbol following the dot in configuration "cfp" */ struct symbol *bsp; /* Symbol following the dot in configuration "bcfp" */ struct state *newstp; /* A pointer to a successor state */ /* Each configuration becomes complete after it contibutes to a successor ** state. Initially, all configurations are incomplete */ for(cfp=stp->cfp; cfp; cfp=cfp->next) cfp->status = INCOMPLETE; /* Loop through all configurations of the state "stp" */ for(cfp=stp->cfp; cfp; cfp=cfp->next){ if( cfp->status==COMPLETE ) continue; /* Already used by inner loop */ if( cfp->dot>=cfp->rp->nrhs ) continue; /* Can't shift this config */ Configlist_reset(); /* Reset the new config set */ sp = cfp->rp->rhs[cfp->dot]; /* Symbol after the dot */ /* For every configuration in the state "stp" which has the symbol "sp" ** following its dot, add the same configuration to the basis set under ** construction but with the dot shifted one symbol to the right. */ for(bcfp=cfp; bcfp; bcfp=bcfp->next){ if( bcfp->status==COMPLETE ) continue; /* Already used */ if( bcfp->dot>=bcfp->rp->nrhs ) continue; /* Can't shift this one */ bsp = bcfp->rp->rhs[bcfp->dot]; /* Get symbol after dot */ if( !same_symbol(bsp,sp) ) continue; /* Must be same as for "cfp" */ bcfp->status = COMPLETE; /* Mark this config as used */ new = Configlist_addbasis(bcfp->rp,bcfp->dot+1); Plink_add(&new->bplp,bcfp); } /* Get a pointer to the state described by the basis configuration set ** constructed in the preceding loop */ newstp = getstate(lemp); /* The state "newstp" is reached from the state "stp" by a shift action ** on the symbol "sp" */ if( sp->type==MULTITERMINAL ){ int i; for(i=0; insubsym; i++){ Action_add(&stp->ap,SHIFT,sp->subsym[i],(char*)newstp); } }else{ Action_add(&stp->ap,SHIFT,sp,(char *)newstp); } } } /* ** Construct the propagation links */ void FindLinks(lemp) struct lemon *lemp; { int i; struct config *cfp, *other; struct state *stp; struct plink *plp; /* Housekeeping detail: ** Add to every propagate link a pointer back to the state to ** which the link is attached. */ for(i=0; instate; i++){ stp = lemp->sorted[i]; for(cfp=stp->cfp; cfp; cfp=cfp->next){ cfp->stp = stp; } } /* Convert all backlinks into forward links. Only the forward ** links are used in the follow-set computation. */ for(i=0; instate; i++){ stp = lemp->sorted[i]; for(cfp=stp->cfp; cfp; cfp=cfp->next){ for(plp=cfp->bplp; plp; plp=plp->next){ other = plp->cfp; Plink_add(&other->fplp,cfp); } } } } /* Compute all followsets. ** ** A followset is the set of all symbols which can come immediately ** after a configuration. */ void FindFollowSets(lemp) struct lemon *lemp; { int i; struct config *cfp; struct plink *plp; int progress; int change; for(i=0; instate; i++){ for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){ cfp->status = INCOMPLETE; } } do{ progress = 0; for(i=0; instate; i++){ for(cfp=lemp->sorted[i]->cfp; cfp; cfp=cfp->next){ if( cfp->status==COMPLETE ) continue; for(plp=cfp->fplp; plp; plp=plp->next){ change = SetUnion(plp->cfp->fws,cfp->fws); if( change ){ plp->cfp->status = INCOMPLETE; progress = 1; } } cfp->status = COMPLETE; } } }while( progress ); } static int resolve_conflict(); /* Compute the reduce actions, and resolve conflicts. */ void FindActions(lemp) struct lemon *lemp; { int i,j; struct config *cfp; struct state *stp; struct symbol *sp; struct rule *rp; /* Add all of the reduce actions ** A reduce action is added for each element of the followset of ** a configuration which has its dot at the extreme right. */ for(i=0; instate; i++){ /* Loop over all states */ stp = lemp->sorted[i]; for(cfp=stp->cfp; cfp; cfp=cfp->next){ /* Loop over all configurations */ if( cfp->rp->nrhs==cfp->dot ){ /* Is dot at extreme right? */ for(j=0; jnterminal; j++){ if( SetFind(cfp->fws,j) ){ /* Add a reduce action to the state "stp" which will reduce by the ** rule "cfp->rp" if the lookahead symbol is "lemp->symbols[j]" */ Action_add(&stp->ap,REDUCE,lemp->symbols[j],(char *)cfp->rp); } } } } } /* Add the accepting token */ if( lemp->start ){ sp = Symbol_find(lemp->start); if( sp==0 ) sp = lemp->rule->lhs; }else{ sp = lemp->rule->lhs; } /* Add to the first state (which is always the starting state of the ** finite state machine) an action to ACCEPT if the lookahead is the ** start nonterminal. */ Action_add(&lemp->sorted[0]->ap,ACCEPT,sp,0); /* Resolve conflicts */ for(i=0; instate; i++){ struct action *ap, *nap; struct state *stp; stp = lemp->sorted[i]; assert( stp->ap ); stp->ap = Action_sort(stp->ap); for(ap=stp->ap; ap && ap->next; ap=ap->next){ for(nap=ap->next; nap && nap->sp==ap->sp; nap=nap->next){ /* The two actions "ap" and "nap" have the same lookahead. ** Figure out which one should be used */ lemp->nconflict += resolve_conflict(ap,nap,lemp->errsym); } } } /* Report an error for each rule that can never be reduced. */ for(rp=lemp->rule; rp; rp=rp->next) rp->canReduce = B_FALSE; for(i=0; instate; i++){ struct action *ap; for(ap=lemp->sorted[i]->ap; ap; ap=ap->next){ if( ap->type==REDUCE ) ap->x.rp->canReduce = B_TRUE; } } for(rp=lemp->rule; rp; rp=rp->next){ if( rp->canReduce ) continue; ErrorMsg(lemp->filename,rp->ruleline,"This rule can not be reduced.\n"); lemp->errorcnt++; } } /* Resolve a conflict between the two given actions. If the ** conflict can't be resolve, return non-zero. ** ** NO LONGER TRUE: ** To resolve a conflict, first look to see if either action ** is on an error rule. In that case, take the action which ** is not associated with the error rule. If neither or both ** actions are associated with an error rule, then try to ** use precedence to resolve the conflict. ** ** If either action is a SHIFT, then it must be apx. This ** function won't work if apx->type==REDUCE and apy->type==SHIFT. */ static int resolve_conflict(apx,apy,errsym) struct action *apx; struct action *apy; struct symbol *errsym; /* The error symbol (if defined. NULL otherwise) */ { struct symbol *spx, *spy; int errcnt = 0; assert( apx->sp==apy->sp ); /* Otherwise there would be no conflict */ if( apx->type==SHIFT && apy->type==REDUCE ){ spx = apx->sp; spy = apy->x.rp->precsym; if( spy==0 || spx->prec<0 || spy->prec<0 ){ /* Not enough precedence information. */ apy->type = CONFLICT; errcnt++; }else if( spx->prec>spy->prec ){ /* Lower precedence wins */ apy->type = RD_RESOLVED; }else if( spx->precprec ){ apx->type = SH_RESOLVED; }else if( spx->prec==spy->prec && spx->assoc==RIGHT ){ /* Use operator */ apy->type = RD_RESOLVED; /* associativity */ }else if( spx->prec==spy->prec && spx->assoc==LEFT ){ /* to break tie */ apx->type = SH_RESOLVED; }else{ assert( spx->prec==spy->prec && spx->assoc==NONE ); apy->type = CONFLICT; errcnt++; } }else if( apx->type==REDUCE && apy->type==REDUCE ){ spx = apx->x.rp->precsym; spy = apy->x.rp->precsym; if( spx==0 || spy==0 || spx->prec<0 || spy->prec<0 || spx->prec==spy->prec ){ apy->type = CONFLICT; errcnt++; }else if( spx->prec>spy->prec ){ apy->type = RD_RESOLVED; }else if( spx->precprec ){ apx->type = RD_RESOLVED; } }else{ assert( apx->type==SH_RESOLVED || apx->type==RD_RESOLVED || apx->type==CONFLICT || apy->type==SH_RESOLVED || apy->type==RD_RESOLVED || apy->type==CONFLICT ); /* The REDUCE/SHIFT case cannot happen because SHIFTs come before ** REDUCEs on the list. If we reach this point it must be because ** the parser conflict had already been resolved. */ } return errcnt; } /********************* From the file "configlist.c" *************************/ /* ** Routines to processing a configuration list and building a state ** in the LEMON parser generator. */ static struct config *freelist = 0; /* List of free configurations */ static struct config *current = 0; /* Top of list of configurations */ static struct config **currentend = 0; /* Last on list of configs */ static struct config *basis = 0; /* Top of list of basis configs */ static struct config **basisend = 0; /* End of list of basis configs */ /* Return a pointer to a new configuration */ PRIVATE struct config *newconfig(){ struct config *new; if( freelist==0 ){ int i; int amt = 3; freelist = (struct config *)malloc( sizeof(struct config)*amt ); if( freelist==0 ){ fprintf(stderr,"Unable to allocate memory for a new configuration."); exit(1); } for(i=0; inext; return new; } /* The configuration "old" is no longer used */ PRIVATE void deleteconfig(old) struct config *old; { old->next = freelist; freelist = old; } /* Initialized the configuration list builder */ void Configlist_init(){ current = 0; currentend = ¤t; basis = 0; basisend = &basis; Configtable_init(); return; } /* Initialized the configuration list builder */ void Configlist_reset(){ current = 0; currentend = ¤t; basis = 0; basisend = &basis; Configtable_clear(0); return; } /* Add another configuration to the configuration list */ struct config *Configlist_add(rp,dot) struct rule *rp; /* The rule */ int dot; /* Index into the RHS of the rule where the dot goes */ { struct config *cfp, model; assert( currentend!=0 ); model.rp = rp; model.dot = dot; cfp = Configtable_find(&model); if( cfp==0 ){ cfp = newconfig(); cfp->rp = rp; cfp->dot = dot; cfp->fws = SetNew(); cfp->stp = 0; cfp->fplp = cfp->bplp = 0; cfp->next = 0; cfp->bp = 0; *currentend = cfp; currentend = &cfp->next; Configtable_insert(cfp); } return cfp; } /* Add a basis configuration to the configuration list */ struct config *Configlist_addbasis(rp,dot) struct rule *rp; int dot; { struct config *cfp, model; assert( basisend!=0 ); assert( currentend!=0 ); model.rp = rp; model.dot = dot; cfp = Configtable_find(&model); if( cfp==0 ){ cfp = newconfig(); cfp->rp = rp; cfp->dot = dot; cfp->fws = SetNew(); cfp->stp = 0; cfp->fplp = cfp->bplp = 0; cfp->next = 0; cfp->bp = 0; *currentend = cfp; currentend = &cfp->next; *basisend = cfp; basisend = &cfp->bp; Configtable_insert(cfp); } return cfp; } /* Compute the closure of the configuration list */ void Configlist_closure(lemp) struct lemon *lemp; { struct config *cfp, *newcfp; struct rule *rp, *newrp; struct symbol *sp, *xsp; int i, dot; assert( currentend!=0 ); for(cfp=current; cfp; cfp=cfp->next){ rp = cfp->rp; dot = cfp->dot; if( dot>=rp->nrhs ) continue; sp = rp->rhs[dot]; if( sp->type==NONTERMINAL ){ if( sp->rule==0 && sp!=lemp->errsym ){ ErrorMsg(lemp->filename,rp->line,"Nonterminal \"%s\" has no rules.", sp->name); lemp->errorcnt++; } for(newrp=sp->rule; newrp; newrp=newrp->nextlhs){ newcfp = Configlist_add(newrp,0); for(i=dot+1; inrhs; i++){ xsp = rp->rhs[i]; if( xsp->type==TERMINAL ){ SetAdd(newcfp->fws,xsp->index); break; }else if( xsp->type==MULTITERMINAL ){ int k; for(k=0; knsubsym; k++){ SetAdd(newcfp->fws, xsp->subsym[k]->index); } break; }else{ SetUnion(newcfp->fws,xsp->firstset); if( xsp->lambda==B_FALSE ) break; } } if( i==rp->nrhs ) Plink_add(&cfp->fplp,newcfp); } } } return; } /* Sort the configuration list */ void Configlist_sort(){ current = (struct config *)msort((char *)current,(char **)&(current->next),Configcmp); currentend = 0; return; } /* Sort the basis configuration list */ void Configlist_sortbasis(){ basis = (struct config *)msort((char *)current,(char **)&(current->bp),Configcmp); basisend = 0; return; } /* Return a pointer to the head of the configuration list and ** reset the list */ struct config *Configlist_return(){ struct config *old; old = current; current = 0; currentend = 0; return old; } /* Return a pointer to the head of the configuration list and ** reset the list */ struct config *Configlist_basis(){ struct config *old; old = basis; basis = 0; basisend = 0; return old; } /* Free all elements of the given configuration list */ void Configlist_eat(cfp) struct config *cfp; { struct config *nextcfp; for(; cfp; cfp=nextcfp){ nextcfp = cfp->next; assert( cfp->fplp==0 ); assert( cfp->bplp==0 ); if( cfp->fws ) SetFree(cfp->fws); deleteconfig(cfp); } return; } /***************** From the file "error.c" *********************************/ /* ** Code for printing error message. */ /* Find a good place to break "msg" so that its length is at least "min" ** but no more than "max". Make the point as close to max as possible. */ static int findbreak(msg,min,max) char *msg; int min; int max; { int i,spot; char c; for(i=spot=min; i<=max; i++){ c = msg[i]; if( c=='\t' ) msg[i] = ' '; if( c=='\n' ){ msg[i] = ' '; spot = i; break; } if( c==0 ){ spot = i; break; } if( c=='-' && i0 ){ sprintf(prefix,"%.*s:%d: ",PREFIXLIMIT-10,filename,lineno); }else{ sprintf(prefix,"%.*s: ",PREFIXLIMIT-10,filename); } prefixsize = strlen(prefix); availablewidth = LINEWIDTH - prefixsize; /* Generate the error message */ vsprintf(errmsg,format,ap); va_end(ap); errmsgsize = strlen(errmsg); /* Remove trailing '\n's from the error message. */ while( errmsgsize>0 && errmsg[errmsgsize-1]=='\n' ){ errmsg[--errmsgsize] = 0; } /* Print the error message */ base = 0; while( errmsg[base]!=0 ){ end = restart = findbreak(&errmsg[base],0,availablewidth); restart += base; while( errmsg[restart]==' ' ) restart++; fprintf(stdout,"%s%.*s\n",prefix,end,&errmsg[base]); base = restart; } } /**************** From the file "main.c" ************************************/ /* ** Main program file for the LEMON parser generator. */ /* Report an out-of-memory condition and abort. This function ** is used mostly by the "MemoryCheck" macro in struct.h */ void memory_error(){ fprintf(stderr,"Out of memory. Aborting...\n"); exit(1); } static int nDefine = 0; /* Number of -D options on the command line */ static char **azDefine = 0; /* Name of the -D macros */ /* This routine is called with the argument to each -D command-line option. ** Add the macro defined to the azDefine array. */ static void handle_D_option(char *z){ char **paz; nDefine++; azDefine = realloc(azDefine, sizeof(azDefine[0])*nDefine); if( azDefine==0 ){ fprintf(stderr,"out of memory\n"); exit(1); } paz = &azDefine[nDefine-1]; *paz = malloc( strlen(z)+1 ); if( *paz==0 ){ fprintf(stderr,"out of memory\n"); exit(1); } strcpy(*paz, z); for(z=*paz; *z && *z!='='; z++){} *z = 0; } /* The main program. Parse the command line and do it... */ int main(argc,argv) int argc; char **argv; { static int version = 0; static int rpflag = 0; static int basisflag = 0; static int compress = 0; static int quiet = 0; static int statistics = 0; static int mhflag = 0; static struct s_options options[] = { {OPT_FLAG, "b", (char*)&basisflag, "Print only the basis in report."}, {OPT_FLAG, "c", (char*)&compress, "Don't compress the action table."}, {OPT_FSTR, "D", (char*)handle_D_option, "Define an %ifdef macro."}, {OPT_FLAG, "g", (char*)&rpflag, "Print grammar without actions."}, {OPT_FLAG, "m", (char*)&mhflag, "Output a makeheaders compatible file"}, {OPT_FLAG, "q", (char*)&quiet, "(Quiet) Don't print the report file."}, {OPT_FLAG, "s", (char*)&statistics, "Print parser stats to standard output."}, {OPT_FLAG, "x", (char*)&version, "Print the version number."}, {OPT_FLAG,0,0,0} }; int i; struct lemon lem; OptInit(argv,options,stderr); if( version ){ printf("Lemon version 1.0\n"); exit(0); } if( OptNArgs()!=1 ){ fprintf(stderr,"Exactly one filename argument is required.\n"); exit(1); } memset(&lem, 0, sizeof(lem)); lem.errorcnt = 0; /* Initialize the machine */ Strsafe_init(); Symbol_init(); State_init(); lem.argv0 = argv[0]; lem.filename = OptArg(0); lem.basisflag = basisflag; Symbol_new("$"); lem.errsym = Symbol_new("error"); /* Parse the input file */ Parse(&lem); if( lem.errorcnt ) exit(lem.errorcnt); if( lem.nrule==0 ){ fprintf(stderr,"Empty grammar.\n"); exit(1); } /* Count and index the symbols of the grammar */ lem.nsymbol = Symbol_count(); Symbol_new("{default}"); lem.symbols = Symbol_arrayof(); for(i=0; i<=lem.nsymbol; i++) lem.symbols[i]->index = i; qsort(lem.symbols,lem.nsymbol+1,sizeof(struct symbol*), (int(*)())Symbolcmpp); for(i=0; i<=lem.nsymbol; i++) lem.symbols[i]->index = i; for(i=1; isupper(lem.symbols[i]->name[0]); i++); lem.nterminal = i; /* Generate a reprint of the grammar, if requested on the command line */ if( rpflag ){ Reprint(&lem); }else{ /* Initialize the size for all follow and first sets */ SetSize(lem.nterminal); /* Find the precedence for every production rule (that has one) */ FindRulePrecedences(&lem); /* Compute the lambda-nonterminals and the first-sets for every ** nonterminal */ FindFirstSets(&lem); /* Compute all LR(0) states. Also record follow-set propagation ** links so that the follow-set can be computed later */ lem.nstate = 0; FindStates(&lem); lem.sorted = State_arrayof(); /* Tie up loose ends on the propagation links */ FindLinks(&lem); /* Compute the follow set of every reducible configuration */ FindFollowSets(&lem); /* Compute the action tables */ FindActions(&lem); /* Compress the action tables */ if( compress==0 ) CompressTables(&lem); /* Reorder and renumber the states so that states with fewer choices ** occur at the end. */ ResortStates(&lem); /* Generate a report of the parser generated. (the "y.output" file) */ if( !quiet ) ReportOutput(&lem); /* Generate the source code for the parser */ ReportTable(&lem, mhflag); /* Produce a header file for use by the scanner. (This step is ** omitted if the "-m" option is used because makeheaders will ** generate the file for us.) */ if( !mhflag ) ReportHeader(&lem); } if( statistics ){ printf("Parser statistics: %d terminals, %d nonterminals, %d rules\n", lem.nterminal, lem.nsymbol - lem.nterminal, lem.nrule); printf(" %d states, %d parser table entries, %d conflicts\n", lem.nstate, lem.tablesize, lem.nconflict); } if( lem.nconflict ){ fprintf(stderr,"%d parsing conflicts.\n",lem.nconflict); } exit(lem.errorcnt + lem.nconflict); return (lem.errorcnt + lem.nconflict); } /******************** From the file "msort.c" *******************************/ /* ** A generic merge-sort program. ** ** USAGE: ** Let "ptr" be a pointer to some structure which is at the head of ** a null-terminated list. Then to sort the list call: ** ** ptr = msort(ptr,&(ptr->next),cmpfnc); ** ** In the above, "cmpfnc" is a pointer to a function which compares ** two instances of the structure and returns an integer, as in ** strcmp. The second argument is a pointer to the pointer to the ** second element of the linked list. This address is used to compute ** the offset to the "next" field within the structure. The offset to ** the "next" field must be constant for all structures in the list. ** ** The function returns a new pointer which is the head of the list ** after sorting. ** ** ALGORITHM: ** Merge-sort. */ /* ** Return a pointer to the next structure in the linked list. */ #define NEXT(A) (*(char**)(((unsigned long)A)+offset)) /* ** Inputs: ** a: A sorted, null-terminated linked list. (May be null). ** b: A sorted, null-terminated linked list. (May be null). ** cmp: A pointer to the comparison function. ** offset: Offset in the structure to the "next" field. ** ** Return Value: ** A pointer to the head of a sorted list containing the elements ** of both a and b. ** ** Side effects: ** The "next" pointers for elements in the lists a and b are ** changed. */ static char *merge(a,b,cmp,offset) char *a; char *b; int (*cmp)(); int offset; { char *ptr, *head; if( a==0 ){ head = b; }else if( b==0 ){ head = a; }else{ if( (*cmp)(a,b)<0 ){ ptr = a; a = NEXT(a); }else{ ptr = b; b = NEXT(b); } head = ptr; while( a && b ){ if( (*cmp)(a,b)<0 ){ NEXT(ptr) = a; ptr = a; a = NEXT(a); }else{ NEXT(ptr) = b; ptr = b; b = NEXT(b); } } if( a ) NEXT(ptr) = a; else NEXT(ptr) = b; } return head; } /* ** Inputs: ** list: Pointer to a singly-linked list of structures. ** next: Pointer to pointer to the second element of the list. ** cmp: A comparison function. ** ** Return Value: ** A pointer to the head of a sorted list containing the elements ** orginally in list. ** ** Side effects: ** The "next" pointers for elements in list are changed. */ #define LISTSIZE 30 char *msort(list,next,cmp) char *list; char **next; int (*cmp)(); { unsigned long offset; char *ep; char *set[LISTSIZE]; int i; offset = (unsigned long)next - (unsigned long)list; for(i=0; istate = WAITING_FOR_DECL_KEYWORD; }else if( islower(x[0]) ){ psp->lhs = Symbol_new(x); psp->nrhs = 0; psp->lhsalias = 0; psp->state = WAITING_FOR_ARROW; }else if( x[0]=='{' ){ if( psp->prevrule==0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "There is not prior rule opon which to attach the code \ fragment which begins on this line."); psp->errorcnt++; }else if( psp->prevrule->code!=0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "Code fragment beginning on this line is not the first \ to follow the previous rule."); psp->errorcnt++; }else{ psp->prevrule->line = psp->tokenlineno; psp->prevrule->code = &x[1]; } }else if( x[0]=='[' ){ psp->state = PRECEDENCE_MARK_1; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Token \"%s\" should be either \"%%\" or a nonterminal name.", x); psp->errorcnt++; } break; case PRECEDENCE_MARK_1: if( !isupper(x[0]) ){ ErrorMsg(psp->filename,psp->tokenlineno, "The precedence symbol must be a terminal."); psp->errorcnt++; }else if( psp->prevrule==0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "There is no prior rule to assign precedence \"[%s]\".",x); psp->errorcnt++; }else if( psp->prevrule->precsym!=0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "Precedence mark on this line is not the first \ to follow the previous rule."); psp->errorcnt++; }else{ psp->prevrule->precsym = Symbol_new(x); } psp->state = PRECEDENCE_MARK_2; break; case PRECEDENCE_MARK_2: if( x[0]!=']' ){ ErrorMsg(psp->filename,psp->tokenlineno, "Missing \"]\" on precedence mark."); psp->errorcnt++; } psp->state = WAITING_FOR_DECL_OR_RULE; break; case WAITING_FOR_ARROW: if( x[0]==':' && x[1]==':' && x[2]=='=' ){ psp->state = IN_RHS; }else if( x[0]=='(' ){ psp->state = LHS_ALIAS_1; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Expected to see a \":\" following the LHS symbol \"%s\".", psp->lhs->name); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case LHS_ALIAS_1: if( isalpha(x[0]) ){ psp->lhsalias = x; psp->state = LHS_ALIAS_2; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "\"%s\" is not a valid alias for the LHS \"%s\"\n", x,psp->lhs->name); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case LHS_ALIAS_2: if( x[0]==')' ){ psp->state = LHS_ALIAS_3; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Missing \")\" following LHS alias name \"%s\".",psp->lhsalias); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case LHS_ALIAS_3: if( x[0]==':' && x[1]==':' && x[2]=='=' ){ psp->state = IN_RHS; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Missing \"->\" following: \"%s(%s)\".", psp->lhs->name,psp->lhsalias); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case IN_RHS: if( x[0]=='.' ){ struct rule *rp; rp = (struct rule *)malloc( sizeof(struct rule) + sizeof(struct symbol*)*psp->nrhs + sizeof(char*)*psp->nrhs ); if( rp==0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "Can't allocate enough memory for this rule."); psp->errorcnt++; psp->prevrule = 0; }else{ int i; rp->ruleline = psp->tokenlineno; rp->rhs = (struct symbol**)&rp[1]; rp->rhsalias = (char**)&(rp->rhs[psp->nrhs]); for(i=0; inrhs; i++){ rp->rhs[i] = psp->rhs[i]; rp->rhsalias[i] = psp->alias[i]; } rp->lhs = psp->lhs; rp->lhsalias = psp->lhsalias; rp->nrhs = psp->nrhs; rp->code = 0; rp->precsym = 0; rp->index = psp->gp->nrule++; rp->nextlhs = rp->lhs->rule; rp->lhs->rule = rp; rp->next = 0; if( psp->firstrule==0 ){ psp->firstrule = psp->lastrule = rp; }else{ psp->lastrule->next = rp; psp->lastrule = rp; } psp->prevrule = rp; } psp->state = WAITING_FOR_DECL_OR_RULE; }else if( isalpha(x[0]) ){ if( psp->nrhs>=MAXRHS ){ ErrorMsg(psp->filename,psp->tokenlineno, "Too many symbols on RHS or rule beginning at \"%s\".", x); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; }else{ psp->rhs[psp->nrhs] = Symbol_new(x); psp->alias[psp->nrhs] = 0; psp->nrhs++; } }else if( (x[0]=='|' || x[0]=='/') && psp->nrhs>0 ){ struct symbol *msp = psp->rhs[psp->nrhs-1]; if( msp->type!=MULTITERMINAL ){ struct symbol *origsp = msp; msp = malloc(sizeof(*msp)); memset(msp, 0, sizeof(*msp)); msp->type = MULTITERMINAL; msp->nsubsym = 1; msp->subsym = malloc(sizeof(struct symbol*)); msp->subsym[0] = origsp; msp->name = origsp->name; psp->rhs[psp->nrhs-1] = msp; } msp->nsubsym++; msp->subsym = realloc(msp->subsym, sizeof(struct symbol*)*msp->nsubsym); msp->subsym[msp->nsubsym-1] = Symbol_new(&x[1]); if( islower(x[1]) || islower(msp->subsym[0]->name[0]) ){ ErrorMsg(psp->filename,psp->tokenlineno, "Cannot form a compound containing a non-terminal"); psp->errorcnt++; } }else if( x[0]=='(' && psp->nrhs>0 ){ psp->state = RHS_ALIAS_1; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Illegal character on RHS of rule: \"%s\".",x); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case RHS_ALIAS_1: if( isalpha(x[0]) ){ psp->alias[psp->nrhs-1] = x; psp->state = RHS_ALIAS_2; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "\"%s\" is not a valid alias for the RHS symbol \"%s\"\n", x,psp->rhs[psp->nrhs-1]->name); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case RHS_ALIAS_2: if( x[0]==')' ){ psp->state = IN_RHS; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Missing \")\" following LHS alias name \"%s\".",psp->lhsalias); psp->errorcnt++; psp->state = RESYNC_AFTER_RULE_ERROR; } break; case WAITING_FOR_DECL_KEYWORD: if( isalpha(x[0]) ){ psp->declkeyword = x; psp->declargslot = 0; psp->decllnslot = 0; psp->state = WAITING_FOR_DECL_ARG; if( strcmp(x,"name")==0 ){ psp->declargslot = &(psp->gp->name); }else if( strcmp(x,"include")==0 ){ psp->declargslot = &(psp->gp->include); psp->decllnslot = &psp->gp->includeln; }else if( strcmp(x,"code")==0 ){ psp->declargslot = &(psp->gp->extracode); psp->decllnslot = &psp->gp->extracodeln; }else if( strcmp(x,"token_destructor")==0 ){ psp->declargslot = &psp->gp->tokendest; psp->decllnslot = &psp->gp->tokendestln; }else if( strcmp(x,"default_destructor")==0 ){ psp->declargslot = &psp->gp->vardest; psp->decllnslot = &psp->gp->vardestln; }else if( strcmp(x,"token_prefix")==0 ){ psp->declargslot = &psp->gp->tokenprefix; }else if( strcmp(x,"syntax_error")==0 ){ psp->declargslot = &(psp->gp->error); psp->decllnslot = &psp->gp->errorln; }else if( strcmp(x,"parse_accept")==0 ){ psp->declargslot = &(psp->gp->accept); psp->decllnslot = &psp->gp->acceptln; }else if( strcmp(x,"parse_failure")==0 ){ psp->declargslot = &(psp->gp->failure); psp->decllnslot = &psp->gp->failureln; }else if( strcmp(x,"stack_overflow")==0 ){ psp->declargslot = &(psp->gp->overflow); psp->decllnslot = &psp->gp->overflowln; }else if( strcmp(x,"extra_argument")==0 ){ psp->declargslot = &(psp->gp->arg); }else if( strcmp(x,"token_type")==0 ){ psp->declargslot = &(psp->gp->tokentype); }else if( strcmp(x,"default_type")==0 ){ psp->declargslot = &(psp->gp->vartype); }else if( strcmp(x,"stack_size")==0 ){ psp->declargslot = &(psp->gp->stacksize); }else if( strcmp(x,"start_symbol")==0 ){ psp->declargslot = &(psp->gp->start); }else if( strcmp(x,"left")==0 ){ psp->preccounter++; psp->declassoc = LEFT; psp->state = WAITING_FOR_PRECEDENCE_SYMBOL; }else if( strcmp(x,"right")==0 ){ psp->preccounter++; psp->declassoc = RIGHT; psp->state = WAITING_FOR_PRECEDENCE_SYMBOL; }else if( strcmp(x,"nonassoc")==0 ){ psp->preccounter++; psp->declassoc = NONE; psp->state = WAITING_FOR_PRECEDENCE_SYMBOL; }else if( strcmp(x,"destructor")==0 ){ psp->state = WAITING_FOR_DESTRUCTOR_SYMBOL; }else if( strcmp(x,"type")==0 ){ psp->state = WAITING_FOR_DATATYPE_SYMBOL; }else if( strcmp(x,"fallback")==0 ){ psp->fallback = 0; psp->state = WAITING_FOR_FALLBACK_ID; }else if( strcmp(x,"wildcard")==0 ){ psp->state = WAITING_FOR_WILDCARD_ID; }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Unknown declaration keyword: \"%%%s\".",x); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; } }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Illegal declaration keyword: \"%s\".",x); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; } break; case WAITING_FOR_DESTRUCTOR_SYMBOL: if( !isalpha(x[0]) ){ ErrorMsg(psp->filename,psp->tokenlineno, "Symbol name missing after %destructor keyword"); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; }else{ struct symbol *sp = Symbol_new(x); psp->declargslot = &sp->destructor; psp->decllnslot = &sp->destructorln; psp->state = WAITING_FOR_DECL_ARG; } break; case WAITING_FOR_DATATYPE_SYMBOL: if( !isalpha(x[0]) ){ ErrorMsg(psp->filename,psp->tokenlineno, "Symbol name missing after %destructor keyword"); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; }else{ struct symbol *sp = Symbol_new(x); psp->declargslot = &sp->datatype; psp->decllnslot = 0; psp->state = WAITING_FOR_DECL_ARG; } break; case WAITING_FOR_PRECEDENCE_SYMBOL: if( x[0]=='.' ){ psp->state = WAITING_FOR_DECL_OR_RULE; }else if( isupper(x[0]) ){ struct symbol *sp; sp = Symbol_new(x); if( sp->prec>=0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "Symbol \"%s\" has already be given a precedence.",x); psp->errorcnt++; }else{ sp->prec = psp->preccounter; sp->assoc = psp->declassoc; } }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Can't assign a precedence to \"%s\".",x); psp->errorcnt++; } break; case WAITING_FOR_DECL_ARG: if( (x[0]=='{' || x[0]=='\"' || isalnum(x[0])) ){ if( *(psp->declargslot)!=0 ){ ErrorMsg(psp->filename,psp->tokenlineno, "The argument \"%s\" to declaration \"%%%s\" is not the first.", x[0]=='\"' ? &x[1] : x,psp->declkeyword); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; }else{ *(psp->declargslot) = (x[0]=='\"' || x[0]=='{') ? &x[1] : x; if( psp->decllnslot ) *psp->decllnslot = psp->tokenlineno; psp->state = WAITING_FOR_DECL_OR_RULE; } }else{ ErrorMsg(psp->filename,psp->tokenlineno, "Illegal argument to %%%s: %s",psp->declkeyword,x); psp->errorcnt++; psp->state = RESYNC_AFTER_DECL_ERROR; } break; case WAITING_FOR_FALLBACK_ID: if( x[0]=='.' ){ psp->state = WAITING_FOR_DECL_OR_RULE; }else if( !isupper(x[0]) ){ ErrorMsg(psp->filename, psp->tokenlineno, "%%fallback argument \"%s\" should be a token", x); psp->errorcnt++; }else{ struct symbol *sp = Symbol_new(x); if( psp->fallback==0 ){ psp->fallback = sp; }else if( sp->fallback ){ ErrorMsg(psp->filename, psp->tokenlineno, "More than one fallback assigned to token %s", x); psp->errorcnt++; }else{ sp->fallback = psp->fallback; psp->gp->has_fallback = 1; } } break; case WAITING_FOR_WILDCARD_ID: if( x[0]=='.' ){ psp->state = WAITING_FOR_DECL_OR_RULE; }else if( !isupper(x[0]) ){ ErrorMsg(psp->filename, psp->tokenlineno, "%%wildcard argument \"%s\" should be a token", x); psp->errorcnt++; }else{ struct symbol *sp = Symbol_new(x); if( psp->gp->wildcard==0 ){ psp->gp->wildcard = sp; }else{ ErrorMsg(psp->filename, psp->tokenlineno, "Extra wildcard to token: %s", x); psp->errorcnt++; } } break; case RESYNC_AFTER_RULE_ERROR: /* if( x[0]=='.' ) psp->state = WAITING_FOR_DECL_OR_RULE; ** break; */ case RESYNC_AFTER_DECL_ERROR: if( x[0]=='.' ) psp->state = WAITING_FOR_DECL_OR_RULE; if( x[0]=='%' ) psp->state = WAITING_FOR_DECL_KEYWORD; break; } } /* Run the proprocessor over the input file text. The global variables ** azDefine[0] through azDefine[nDefine-1] contains the names of all defined ** macros. This routine looks for "%ifdef" and "%ifndef" and "%endif" and ** comments them out. Text in between is also commented out as appropriate. */ static void preprocess_input(char *z){ int i, j, k, n; int exclude = 0; int start; int lineno = 1; int start_lineno; for(i=0; z[i]; i++){ if( z[i]=='\n' ) lineno++; if( z[i]!='%' || (i>0 && z[i-1]!='\n') ) continue; if( strncmp(&z[i],"%endif",6)==0 && isspace(z[i+6]) ){ if( exclude ){ exclude--; if( exclude==0 ){ for(j=start; jfilename; ps.errorcnt = 0; ps.state = INITIALIZE; /* Begin by reading the input file */ fp = fopen(ps.filename,"rb"); if( fp==0 ){ ErrorMsg(ps.filename,0,"Can't open this file for reading."); gp->errorcnt++; return; } fseek(fp,0,2); filesize = ftell(fp); rewind(fp); filebuf = (char *)malloc( filesize+1 ); if( filebuf==0 ){ ErrorMsg(ps.filename,0,"Can't allocate %d of memory to hold this file.", filesize+1); gp->errorcnt++; return; } if( fread(filebuf,1,filesize,fp)!=filesize ){ ErrorMsg(ps.filename,0,"Can't read in all %d bytes of this file.", filesize); free(filebuf); gp->errorcnt++; return; } fclose(fp); filebuf[filesize] = 0; /* Make an initial pass through the file to handle %ifdef and %ifndef */ preprocess_input(filebuf); /* Now scan the text of the input file */ lineno = 1; for(cp=filebuf; (c= *cp)!=0; ){ if( c=='\n' ) lineno++; /* Keep track of the line number */ if( isspace(c) ){ cp++; continue; } /* Skip all white space */ if( c=='/' && cp[1]=='/' ){ /* Skip C++ style comments */ cp+=2; while( (c= *cp)!=0 && c!='\n' ) cp++; continue; } if( c=='/' && cp[1]=='*' ){ /* Skip C style comments */ cp+=2; while( (c= *cp)!=0 && (c!='/' || cp[-1]!='*') ){ if( c=='\n' ) lineno++; cp++; } if( c ) cp++; continue; } ps.tokenstart = cp; /* Mark the beginning of the token */ ps.tokenlineno = lineno; /* Linenumber on which token begins */ if( c=='\"' ){ /* String literals */ cp++; while( (c= *cp)!=0 && c!='\"' ){ if( c=='\n' ) lineno++; cp++; } if( c==0 ){ ErrorMsg(ps.filename,startline, "String starting on this line is not terminated before the end of the file."); ps.errorcnt++; nextcp = cp; }else{ nextcp = cp+1; } }else if( c=='{' ){ /* A block of C code */ int level; cp++; for(level=1; (c= *cp)!=0 && (level>1 || c!='}'); cp++){ if( c=='\n' ) lineno++; else if( c=='{' ) level++; else if( c=='}' ) level--; else if( c=='/' && cp[1]=='*' ){ /* Skip comments */ int prevc; cp = &cp[2]; prevc = 0; while( (c= *cp)!=0 && (c!='/' || prevc!='*') ){ if( c=='\n' ) lineno++; prevc = c; cp++; } }else if( c=='/' && cp[1]=='/' ){ /* Skip C++ style comments too */ cp = &cp[2]; while( (c= *cp)!=0 && c!='\n' ) cp++; if( c ) lineno++; }else if( c=='\'' || c=='\"' ){ /* String a character literals */ int startchar, prevc; startchar = c; prevc = 0; for(cp++; (c= *cp)!=0 && (c!=startchar || prevc=='\\'); cp++){ if( c=='\n' ) lineno++; if( prevc=='\\' ) prevc = 0; else prevc = c; } } } if( c==0 ){ ErrorMsg(ps.filename,ps.tokenlineno, "C code starting on this line is not terminated before the end of the file."); ps.errorcnt++; nextcp = cp; }else{ nextcp = cp+1; } }else if( isalnum(c) ){ /* Identifiers */ while( (c= *cp)!=0 && (isalnum(c) || c=='_') ) cp++; nextcp = cp; }else if( c==':' && cp[1]==':' && cp[2]=='=' ){ /* The operator "::=" */ cp += 3; nextcp = cp; }else if( (c=='/' || c=='|') && isalpha(cp[1]) ){ cp += 2; while( (c = *cp)!=0 && (isalnum(c) || c=='_') ) cp++; nextcp = cp; }else{ /* All other (one character) operators */ cp++; nextcp = cp; } c = *cp; *cp = 0; /* Null terminate the token */ parseonetoken(&ps); /* Parse the token */ *cp = c; /* Restore the buffer */ cp = nextcp; } free(filebuf); /* Release the buffer after parsing */ gp->rule = ps.firstrule; gp->errorcnt = ps.errorcnt; } /*************************** From the file "plink.c" *********************/ /* ** Routines processing configuration follow-set propagation links ** in the LEMON parser generator. */ static struct plink *plink_freelist = 0; /* Allocate a new plink */ struct plink *Plink_new(){ struct plink *new; if( plink_freelist==0 ){ int i; int amt = 100; plink_freelist = (struct plink *)malloc( sizeof(struct plink)*amt ); if( plink_freelist==0 ){ fprintf(stderr, "Unable to allocate memory for a new follow-set propagation link.\n"); exit(1); } for(i=0; inext; return new; } /* Add a plink to a plink list */ void Plink_add(plpp,cfp) struct plink **plpp; struct config *cfp; { struct plink *new; new = Plink_new(); new->next = *plpp; *plpp = new; new->cfp = cfp; } /* Transfer every plink on the list "from" to the list "to" */ void Plink_copy(to,from) struct plink **to; struct plink *from; { struct plink *nextpl; while( from ){ nextpl = from->next; from->next = *to; *to = from; from = nextpl; } } /* Delete every plink on the list */ void Plink_delete(plp) struct plink *plp; { struct plink *nextpl; while( plp ){ nextpl = plp->next; plp->next = plink_freelist; plink_freelist = plp; plp = nextpl; } } /*********************** From the file "report.c" **************************/ /* ** Procedures for generating reports and tables in the LEMON parser generator. */ /* Generate a filename with the given suffix. Space to hold the ** name comes from malloc() and must be freed by the calling ** function. */ PRIVATE char *file_makename(lemp,suffix) struct lemon *lemp; char *suffix; { char *name; char *cp; name = malloc( strlen(lemp->filename) + strlen(suffix) + 5 ); if( name==0 ){ fprintf(stderr,"Can't allocate space for a filename.\n"); exit(1); } strcpy(name,lemp->filename); cp = strrchr(name,'.'); if( cp ) *cp = 0; strcat(name,suffix); return name; } /* Open a file with a name based on the name of the input file, ** but with a different (specified) suffix, and return a pointer ** to the stream */ PRIVATE FILE *file_open(lemp,suffix,mode) struct lemon *lemp; char *suffix; char *mode; { FILE *fp; if( lemp->outname ) free(lemp->outname); lemp->outname = file_makename(lemp, suffix); fp = fopen(lemp->outname,mode); if( fp==0 && *mode=='w' ){ fprintf(stderr,"Can't open file \"%s\".\n",lemp->outname); lemp->errorcnt++; return 0; } return fp; } /* Duplicate the input file without comments and without actions ** on rules */ void Reprint(lemp) struct lemon *lemp; { struct rule *rp; struct symbol *sp; int i, j, maxlen, len, ncolumns, skip; printf("// Reprint of input file \"%s\".\n// Symbols:\n",lemp->filename); maxlen = 10; for(i=0; insymbol; i++){ sp = lemp->symbols[i]; len = strlen(sp->name); if( len>maxlen ) maxlen = len; } ncolumns = 76/(maxlen+5); if( ncolumns<1 ) ncolumns = 1; skip = (lemp->nsymbol + ncolumns - 1)/ncolumns; for(i=0; insymbol; j+=skip){ sp = lemp->symbols[j]; assert( sp->index==j ); printf(" %3d %-*.*s",j,maxlen,maxlen,sp->name); } printf("\n"); } for(rp=lemp->rule; rp; rp=rp->next){ printf("%s",rp->lhs->name); /* if( rp->lhsalias ) printf("(%s)",rp->lhsalias); */ printf(" ::="); for(i=0; inrhs; i++){ sp = rp->rhs[i]; printf(" %s", sp->name); if( sp->type==MULTITERMINAL ){ for(j=1; jnsubsym; j++){ printf("|%s", sp->subsym[j]->name); } } /* if( rp->rhsalias[i] ) printf("(%s)",rp->rhsalias[i]); */ } printf("."); if( rp->precsym ) printf(" [%s]",rp->precsym->name); /* if( rp->code ) printf("\n %s",rp->code); */ printf("\n"); } } void ConfigPrint(fp,cfp) FILE *fp; struct config *cfp; { struct rule *rp; struct symbol *sp; int i, j; rp = cfp->rp; fprintf(fp,"%s ::=",rp->lhs->name); for(i=0; i<=rp->nrhs; i++){ if( i==cfp->dot ) fprintf(fp," *"); if( i==rp->nrhs ) break; sp = rp->rhs[i]; fprintf(fp," %s", sp->name); if( sp->type==MULTITERMINAL ){ for(j=1; jnsubsym; j++){ fprintf(fp,"|%s",sp->subsym[j]->name); } } } } /* #define TEST */ #if 0 /* Print a set */ PRIVATE void SetPrint(out,set,lemp) FILE *out; char *set; struct lemon *lemp; { int i; char *spacer; spacer = ""; fprintf(out,"%12s[",""); for(i=0; interminal; i++){ if( SetFind(set,i) ){ fprintf(out,"%s%s",spacer,lemp->symbols[i]->name); spacer = " "; } } fprintf(out,"]\n"); } /* Print a plink chain */ PRIVATE void PlinkPrint(out,plp,tag) FILE *out; struct plink *plp; char *tag; { while( plp ){ fprintf(out,"%12s%s (state %2d) ","",tag,plp->cfp->stp->statenum); ConfigPrint(out,plp->cfp); fprintf(out,"\n"); plp = plp->next; } } #endif /* Print an action to the given file descriptor. Return FALSE if ** nothing was actually printed. */ int PrintAction(struct action *ap, FILE *fp, int indent){ int result = 1; switch( ap->type ){ case SHIFT: fprintf(fp,"%*s shift %d",indent,ap->sp->name,ap->x.stp->statenum); break; case REDUCE: fprintf(fp,"%*s reduce %d",indent,ap->sp->name,ap->x.rp->index); break; case ACCEPT: fprintf(fp,"%*s accept",indent,ap->sp->name); break; case ERROR: fprintf(fp,"%*s error",indent,ap->sp->name); break; case CONFLICT: fprintf(fp,"%*s reduce %-3d ** Parsing conflict **", indent,ap->sp->name,ap->x.rp->index); break; case SH_RESOLVED: case RD_RESOLVED: case NOT_USED: result = 0; break; } return result; } /* Generate the "y.output" log file */ void ReportOutput(lemp) struct lemon *lemp; { int i; struct state *stp; struct config *cfp; struct action *ap; FILE *fp; fp = file_open(lemp,".out","wb"); if( fp==0 ) return; fprintf(fp," \b"); for(i=0; instate; i++){ stp = lemp->sorted[i]; fprintf(fp,"State %d:\n",stp->statenum); if( lemp->basisflag ) cfp=stp->bp; else cfp=stp->cfp; while( cfp ){ char buf[20]; if( cfp->dot==cfp->rp->nrhs ){ sprintf(buf,"(%d)",cfp->rp->index); fprintf(fp," %5s ",buf); }else{ fprintf(fp," "); } ConfigPrint(fp,cfp); fprintf(fp,"\n"); #if 0 SetPrint(fp,cfp->fws,lemp); PlinkPrint(fp,cfp->fplp,"To "); PlinkPrint(fp,cfp->bplp,"From"); #endif if( lemp->basisflag ) cfp=cfp->bp; else cfp=cfp->next; } fprintf(fp,"\n"); for(ap=stp->ap; ap; ap=ap->next){ if( PrintAction(ap,fp,30) ) fprintf(fp,"\n"); } fprintf(fp,"\n"); } fclose(fp); return; } /* Search for the file "name" which is in the same directory as ** the exacutable */ PRIVATE char *pathsearch(argv0,name,modemask) char *argv0; char *name; int modemask; { char *pathlist; char *path,*cp; char c; extern int access(); #ifdef __WIN32__ cp = strrchr(argv0,'\\'); #else cp = strrchr(argv0,'/'); #endif if( cp ){ c = *cp; *cp = 0; path = (char *)malloc( strlen(argv0) + strlen(name) + 2 ); if( path ) sprintf(path,"%s/%s",argv0,name); *cp = c; }else{ extern char *getenv(); pathlist = getenv("PATH"); if( pathlist==0 ) pathlist = ".:/bin:/usr/bin"; path = (char *)malloc( strlen(pathlist)+strlen(name)+2 ); if( path!=0 ){ while( *pathlist ){ cp = strchr(pathlist,':'); if( cp==0 ) cp = &pathlist[strlen(pathlist)]; c = *cp; *cp = 0; sprintf(path,"%s/%s",pathlist,name); *cp = c; if( c==0 ) pathlist = ""; else pathlist = &cp[1]; if( access(path,modemask)==0 ) break; } } } return path; } /* Given an action, compute the integer value for that action ** which is to be put in the action table of the generated machine. ** Return negative if no action should be generated. */ PRIVATE int compute_action(lemp,ap) struct lemon *lemp; struct action *ap; { int act; switch( ap->type ){ case SHIFT: act = ap->x.stp->statenum; break; case REDUCE: act = ap->x.rp->index + lemp->nstate; break; case ERROR: act = lemp->nstate + lemp->nrule; break; case ACCEPT: act = lemp->nstate + lemp->nrule + 1; break; default: act = -1; break; } return act; } #define LINESIZE 1000 /* The next cluster of routines are for reading the template file ** and writing the results to the generated parser */ /* The first function transfers data from "in" to "out" until ** a line is seen which begins with "%%". The line number is ** tracked. ** ** if name!=0, then any word that begin with "Parse" is changed to ** begin with *name instead. */ PRIVATE void tplt_xfer(name,in,out,lineno) char *name; FILE *in; FILE *out; int *lineno; { int i, iStart; char line[LINESIZE]; while( fgets(line,LINESIZE,in) && (line[0]!='%' || line[1]!='%') ){ (*lineno)++; iStart = 0; if( name ){ for(i=0; line[i]; i++){ if( line[i]=='P' && strncmp(&line[i],"Parse",5)==0 && (i==0 || !isalpha(line[i-1])) ){ if( i>iStart ) fprintf(out,"%.*s",i-iStart,&line[iStart]); fprintf(out,"%s",name); i += 4; iStart = i+1; } } } fprintf(out,"%s",&line[iStart]); } } /* The next function finds the template file and opens it, returning ** a pointer to the opened file. */ PRIVATE FILE *tplt_open(lemp) struct lemon *lemp; { static char templatename[] = "lempar.c"; char buf[1000]; FILE *in; char *tpltname; char *cp; cp = strrchr(lemp->filename,'.'); if( cp ){ sprintf(buf,"%.*s.lt",(int)(cp-lemp->filename),lemp->filename); }else{ sprintf(buf,"%s.lt",lemp->filename); } if( access(buf,004)==0 ){ tpltname = buf; }else if( access(templatename,004)==0 ){ tpltname = templatename; }else{ tpltname = pathsearch(lemp->argv0,templatename,0); } if( tpltname==0 ){ fprintf(stderr,"Can't find the parser driver template file \"%s\".\n", templatename); lemp->errorcnt++; return 0; } in = fopen(tpltname,"rb"); if( in==0 ){ fprintf(stderr,"Can't open the template file \"%s\".\n",templatename); lemp->errorcnt++; return 0; } return in; } /* Print a #line directive line to the output file. */ PRIVATE void tplt_linedir(out,lineno,filename) FILE *out; int lineno; char *filename; { fprintf(out,"#line %d \"",lineno); while( *filename ){ if( *filename == '\\' ) putc('\\',out); putc(*filename,out); filename++; } fprintf(out,"\"\n"); } /* Print a string to the file and keep the linenumber up to date */ PRIVATE void tplt_print(out,lemp,str,strln,lineno) FILE *out; struct lemon *lemp; char *str; int strln; int *lineno; { if( str==0 ) return; tplt_linedir(out,strln,lemp->filename); (*lineno)++; while( *str ){ if( *str=='\n' ) (*lineno)++; putc(*str,out); str++; } if( str[-1]!='\n' ){ putc('\n',out); (*lineno)++; } tplt_linedir(out,*lineno+2,lemp->outname); (*lineno)+=2; return; } /* ** The following routine emits code for the destructor for the ** symbol sp */ void emit_destructor_code(out,sp,lemp,lineno) FILE *out; struct symbol *sp; struct lemon *lemp; int *lineno; { char *cp = 0; int linecnt = 0; if( sp->type==TERMINAL ){ cp = lemp->tokendest; if( cp==0 ) return; tplt_linedir(out,lemp->tokendestln,lemp->filename); fprintf(out,"{"); }else if( sp->destructor ){ cp = sp->destructor; tplt_linedir(out,sp->destructorln,lemp->filename); fprintf(out,"{"); }else if( lemp->vardest ){ cp = lemp->vardest; if( cp==0 ) return; tplt_linedir(out,lemp->vardestln,lemp->filename); fprintf(out,"{"); }else{ assert( 0 ); /* Cannot happen */ } for(; *cp; cp++){ if( *cp=='$' && cp[1]=='$' ){ fprintf(out,"(yypminor->yy%d)",sp->dtnum); cp++; continue; } if( *cp=='\n' ) linecnt++; fputc(*cp,out); } (*lineno) += 3 + linecnt; fprintf(out,"}\n"); tplt_linedir(out,*lineno,lemp->outname); return; } /* ** Return TRUE (non-zero) if the given symbol has a destructor. */ int has_destructor(sp, lemp) struct symbol *sp; struct lemon *lemp; { int ret; if( sp->type==TERMINAL ){ ret = lemp->tokendest!=0; }else{ ret = lemp->vardest!=0 || sp->destructor!=0; } return ret; } /* ** Append text to a dynamically allocated string. If zText is 0 then ** reset the string to be empty again. Always return the complete text ** of the string (which is overwritten with each call). ** ** n bytes of zText are stored. If n==0 then all of zText up to the first ** \000 terminator is stored. zText can contain up to two instances of ** %d. The values of p1 and p2 are written into the first and second ** %d. ** ** If n==-1, then the previous character is overwritten. */ PRIVATE char *append_str(char *zText, int n, int p1, int p2){ static char *z = 0; static int alloced = 0; static int used = 0; int c; char zInt[40]; if( zText==0 ){ used = 0; return z; } if( n<=0 ){ if( n<0 ){ used += n; assert( used>=0 ); } n = strlen(zText); } if( n+sizeof(zInt)*2+used >= alloced ){ alloced = n + sizeof(zInt)*2 + used + 200; z = realloc(z, alloced); } if( z==0 ) return ""; while( n-- > 0 ){ c = *(zText++); if( c=='%' && n>0 && zText[0]=='d' ){ sprintf(zInt, "%d", p1); p1 = p2; strcpy(&z[used], zInt); used += strlen(&z[used]); zText++; n--; }else{ z[used++] = c; } } z[used] = 0; return z; } /* ** zCode is a string that is the action associated with a rule. Expand ** the symbols in this string so that the refer to elements of the parser ** stack. */ PRIVATE void translate_code(struct lemon *lemp, struct rule *rp){ char *cp, *xp; int i; char lhsused = 0; /* True if the LHS element has been used */ char used[MAXRHS]; /* True for each RHS element which is used */ for(i=0; inrhs; i++) used[i] = 0; lhsused = 0; append_str(0,0,0,0); for(cp=rp->code; *cp; cp++){ if( isalpha(*cp) && (cp==rp->code || (!isalnum(cp[-1]) && cp[-1]!='_')) ){ char saved; for(xp= &cp[1]; isalnum(*xp) || *xp=='_'; xp++); saved = *xp; *xp = 0; if( rp->lhsalias && strcmp(cp,rp->lhsalias)==0 ){ append_str("yygotominor.yy%d",0,rp->lhs->dtnum,0); cp = xp; lhsused = 1; }else{ for(i=0; inrhs; i++){ if( rp->rhsalias[i] && strcmp(cp,rp->rhsalias[i])==0 ){ if( cp!=rp->code && cp[-1]=='@' ){ /* If the argument is of the form @X then substituted ** the token number of X, not the value of X */ append_str("yymsp[%d].major",-1,i-rp->nrhs+1,0); }else{ struct symbol *sp = rp->rhs[i]; int dtnum; if( sp->type==MULTITERMINAL ){ dtnum = sp->subsym[0]->dtnum; }else{ dtnum = sp->dtnum; } append_str("yymsp[%d].minor.yy%d",0,i-rp->nrhs+1, dtnum); } cp = xp; used[i] = 1; break; } } } *xp = saved; } append_str(cp, 1, 0, 0); } /* End loop */ /* Check to make sure the LHS has been used */ if( rp->lhsalias && !lhsused ){ ErrorMsg(lemp->filename,rp->ruleline, "Label \"%s\" for \"%s(%s)\" is never used.", rp->lhsalias,rp->lhs->name,rp->lhsalias); lemp->errorcnt++; } /* Generate destructor code for RHS symbols which are not used in the ** reduce code */ for(i=0; inrhs; i++){ if( rp->rhsalias[i] && !used[i] ){ ErrorMsg(lemp->filename,rp->ruleline, "Label %s for \"%s(%s)\" is never used.", rp->rhsalias[i],rp->rhs[i]->name,rp->rhsalias[i]); lemp->errorcnt++; }else if( rp->rhsalias[i]==0 ){ if( has_destructor(rp->rhs[i],lemp) ){ append_str(" yy_destructor(%d,&yymsp[%d].minor);\n", 0, rp->rhs[i]->index,i-rp->nrhs+1); }else{ /* No destructor defined for this term */ } } } cp = append_str(0,0,0,0); rp->code = Strsafe(cp); } /* ** Generate code which executes when the rule "rp" is reduced. Write ** the code to "out". Make sure lineno stays up-to-date. */ PRIVATE void emit_code(out,rp,lemp,lineno) FILE *out; struct rule *rp; struct lemon *lemp; int *lineno; { char *cp; int linecnt = 0; /* Generate code to do the reduce action */ if( rp->code ){ tplt_linedir(out,rp->line,lemp->filename); fprintf(out,"{%s",rp->code); for(cp=rp->code; *cp; cp++){ if( *cp=='\n' ) linecnt++; } /* End loop */ (*lineno) += 3 + linecnt; fprintf(out,"}\n"); tplt_linedir(out,*lineno,lemp->outname); } /* End if( rp->code ) */ return; } /* ** Print the definition of the union used for the parser's data stack. ** This union contains fields for every possible data type for tokens ** and nonterminals. In the process of computing and printing this ** union, also set the ".dtnum" field of every terminal and nonterminal ** symbol. */ void print_stack_union(out,lemp,plineno,mhflag) FILE *out; /* The output stream */ struct lemon *lemp; /* The main info structure for this parser */ int *plineno; /* Pointer to the line number */ int mhflag; /* True if generating makeheaders output */ { int lineno = *plineno; /* The line number of the output */ char **types; /* A hash table of datatypes */ int arraysize; /* Size of the "types" array */ int maxdtlength; /* Maximum length of any ".datatype" field. */ char *stddt; /* Standardized name for a datatype */ int i,j; /* Loop counters */ int hash; /* For hashing the name of a type */ char *name; /* Name of the parser */ /* Allocate and initialize types[] and allocate stddt[] */ arraysize = lemp->nsymbol * 2; types = (char**)malloc( arraysize * sizeof(char*) ); for(i=0; ivartype ){ maxdtlength = strlen(lemp->vartype); } for(i=0; insymbol; i++){ int len; struct symbol *sp = lemp->symbols[i]; if( sp->datatype==0 ) continue; len = strlen(sp->datatype); if( len>maxdtlength ) maxdtlength = len; } stddt = (char*)malloc( maxdtlength*2 + 1 ); if( types==0 || stddt==0 ){ fprintf(stderr,"Out of memory.\n"); exit(1); } /* Build a hash table of datatypes. The ".dtnum" field of each symbol ** is filled in with the hash index plus 1. A ".dtnum" value of 0 is ** used for terminal symbols. If there is no %default_type defined then ** 0 is also used as the .dtnum value for nonterminals which do not specify ** a datatype using the %type directive. */ for(i=0; insymbol; i++){ struct symbol *sp = lemp->symbols[i]; char *cp; if( sp==lemp->errsym ){ sp->dtnum = arraysize+1; continue; } if( sp->type!=NONTERMINAL || (sp->datatype==0 && lemp->vartype==0) ){ sp->dtnum = 0; continue; } cp = sp->datatype; if( cp==0 ) cp = lemp->vartype; j = 0; while( isspace(*cp) ) cp++; while( *cp ) stddt[j++] = *cp++; while( j>0 && isspace(stddt[j-1]) ) j--; stddt[j] = 0; hash = 0; for(j=0; stddt[j]; j++){ hash = hash*53 + stddt[j]; } hash = (hash & 0x7fffffff)%arraysize; while( types[hash] ){ if( strcmp(types[hash],stddt)==0 ){ sp->dtnum = hash + 1; break; } hash++; if( hash>=arraysize ) hash = 0; } if( types[hash]==0 ){ sp->dtnum = hash + 1; types[hash] = (char*)malloc( strlen(stddt)+1 ); if( types[hash]==0 ){ fprintf(stderr,"Out of memory.\n"); exit(1); } strcpy(types[hash],stddt); } } /* Print out the definition of YYTOKENTYPE and YYMINORTYPE */ name = lemp->name ? lemp->name : "Parse"; lineno = *plineno; if( mhflag ){ fprintf(out,"#if INTERFACE\n"); lineno++; } fprintf(out,"#define %sTOKENTYPE %s\n",name, lemp->tokentype?lemp->tokentype:"void*"); lineno++; if( mhflag ){ fprintf(out,"#endif\n"); lineno++; } fprintf(out,"typedef union {\n"); lineno++; fprintf(out," %sTOKENTYPE yy0;\n",name); lineno++; for(i=0; ierrsym->dtnum); lineno++; free(stddt); free(types); fprintf(out,"} YYMINORTYPE;\n"); lineno++; *plineno = lineno; } /* ** Return the name of a C datatype able to represent values between ** lwr and upr, inclusive. */ static const char *minimum_size_type(int lwr, int upr){ if( lwr>=0 ){ if( upr<=255 ){ return "unsigned char"; }else if( upr<65535 ){ return "unsigned short int"; }else{ return "unsigned int"; } }else if( lwr>=-127 && upr<=127 ){ return "signed char"; }else if( lwr>=-32767 && upr<32767 ){ return "short"; }else{ return "int"; } } /* ** Each state contains a set of token transaction and a set of ** nonterminal transactions. Each of these sets makes an instance ** of the following structure. An array of these structures is used ** to order the creation of entries in the yy_action[] table. */ struct axset { struct state *stp; /* A pointer to a state */ int isTkn; /* True to use tokens. False for non-terminals */ int nAction; /* Number of actions */ }; /* ** Compare to axset structures for sorting purposes */ static int axset_compare(const void *a, const void *b){ struct axset *p1 = (struct axset*)a; struct axset *p2 = (struct axset*)b; return p2->nAction - p1->nAction; } /* Generate C source code for the parser */ void ReportTable(lemp, mhflag) struct lemon *lemp; int mhflag; /* Output in makeheaders format if true */ { FILE *out, *in; char line[LINESIZE]; int lineno; struct state *stp; struct action *ap; struct rule *rp; struct acttab *pActtab; int i, j, n; char *name; int mnTknOfst, mxTknOfst; int mnNtOfst, mxNtOfst; struct axset *ax; in = tplt_open(lemp); if( in==0 ) return; out = file_open(lemp,".c","wb"); if( out==0 ){ fclose(in); return; } lineno = 1; tplt_xfer(lemp->name,in,out,&lineno); /* Generate the include code, if any */ tplt_print(out,lemp,lemp->include,lemp->includeln,&lineno); if( mhflag ){ char *name = file_makename(lemp, ".h"); fprintf(out,"#include \"%s\"\n", name); lineno++; free(name); } tplt_xfer(lemp->name,in,out,&lineno); /* Generate #defines for all tokens */ if( mhflag ){ char *prefix; fprintf(out,"#if INTERFACE\n"); lineno++; if( lemp->tokenprefix ) prefix = lemp->tokenprefix; else prefix = ""; for(i=1; interminal; i++){ fprintf(out,"#define %s%-30s %2d\n",prefix,lemp->symbols[i]->name,i); lineno++; } fprintf(out,"#endif\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate the defines */ fprintf(out,"#define YYCODETYPE %s\n", minimum_size_type(0, lemp->nsymbol+5)); lineno++; fprintf(out,"#define YYNOCODE %d\n",lemp->nsymbol+1); lineno++; fprintf(out,"#define YYACTIONTYPE %s\n", minimum_size_type(0, lemp->nstate+lemp->nrule+5)); lineno++; if( lemp->wildcard ){ fprintf(out,"#define YYWILDCARD %d\n", lemp->wildcard->index); lineno++; } print_stack_union(out,lemp,&lineno,mhflag); if( lemp->stacksize ){ if( atoi(lemp->stacksize)<=0 ){ ErrorMsg(lemp->filename,0, "Illegal stack size: [%s]. The stack size should be an integer constant.", lemp->stacksize); lemp->errorcnt++; lemp->stacksize = "100"; } fprintf(out,"#define YYSTACKDEPTH %s\n",lemp->stacksize); lineno++; }else{ fprintf(out,"#define YYSTACKDEPTH 100\n"); lineno++; } if( mhflag ){ fprintf(out,"#if INTERFACE\n"); lineno++; } name = lemp->name ? lemp->name : "Parse"; if( lemp->arg && lemp->arg[0] ){ int i; i = strlen(lemp->arg); while( i>=1 && isspace(lemp->arg[i-1]) ) i--; while( i>=1 && (isalnum(lemp->arg[i-1]) || lemp->arg[i-1]=='_') ) i--; fprintf(out,"#define %sARG_SDECL %s;\n",name,lemp->arg); lineno++; fprintf(out,"#define %sARG_PDECL ,%s\n",name,lemp->arg); lineno++; fprintf(out,"#define %sARG_FETCH %s = yypParser->%s\n", name,lemp->arg,&lemp->arg[i]); lineno++; fprintf(out,"#define %sARG_STORE yypParser->%s = %s\n", name,&lemp->arg[i],&lemp->arg[i]); lineno++; }else{ fprintf(out,"#define %sARG_SDECL\n",name); lineno++; fprintf(out,"#define %sARG_PDECL\n",name); lineno++; fprintf(out,"#define %sARG_FETCH\n",name); lineno++; fprintf(out,"#define %sARG_STORE\n",name); lineno++; } if( mhflag ){ fprintf(out,"#endif\n"); lineno++; } fprintf(out,"#define YYNSTATE %d\n",lemp->nstate); lineno++; fprintf(out,"#define YYNRULE %d\n",lemp->nrule); lineno++; fprintf(out,"#define YYERRORSYMBOL %d\n",lemp->errsym->index); lineno++; fprintf(out,"#define YYERRSYMDT yy%d\n",lemp->errsym->dtnum); lineno++; if( lemp->has_fallback ){ fprintf(out,"#define YYFALLBACK 1\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate the action table and its associates: ** ** yy_action[] A single table containing all actions. ** yy_lookahead[] A table containing the lookahead for each entry in ** yy_action. Used to detect hash collisions. ** yy_shift_ofst[] For each state, the offset into yy_action for ** shifting terminals. ** yy_reduce_ofst[] For each state, the offset into yy_action for ** shifting non-terminals after a reduce. ** yy_default[] Default action for each state. */ /* Compute the actions on all states and count them up */ ax = malloc( sizeof(ax[0])*lemp->nstate*2 ); if( ax==0 ){ fprintf(stderr,"malloc failed\n"); exit(1); } for(i=0; instate; i++){ stp = lemp->sorted[i]; ax[i*2].stp = stp; ax[i*2].isTkn = 1; ax[i*2].nAction = stp->nTknAct; ax[i*2+1].stp = stp; ax[i*2+1].isTkn = 0; ax[i*2+1].nAction = stp->nNtAct; } mxTknOfst = mnTknOfst = 0; mxNtOfst = mnNtOfst = 0; /* Compute the action table. In order to try to keep the size of the ** action table to a minimum, the heuristic of placing the largest action ** sets first is used. */ qsort(ax, lemp->nstate*2, sizeof(ax[0]), axset_compare); pActtab = acttab_alloc(); for(i=0; instate*2 && ax[i].nAction>0; i++){ stp = ax[i].stp; if( ax[i].isTkn ){ for(ap=stp->ap; ap; ap=ap->next){ int action; if( ap->sp->index>=lemp->nterminal ) continue; action = compute_action(lemp, ap); if( action<0 ) continue; acttab_action(pActtab, ap->sp->index, action); } stp->iTknOfst = acttab_insert(pActtab); if( stp->iTknOfstiTknOfst; if( stp->iTknOfst>mxTknOfst ) mxTknOfst = stp->iTknOfst; }else{ for(ap=stp->ap; ap; ap=ap->next){ int action; if( ap->sp->indexnterminal ) continue; if( ap->sp->index==lemp->nsymbol ) continue; action = compute_action(lemp, ap); if( action<0 ) continue; acttab_action(pActtab, ap->sp->index, action); } stp->iNtOfst = acttab_insert(pActtab); if( stp->iNtOfstiNtOfst; if( stp->iNtOfst>mxNtOfst ) mxNtOfst = stp->iNtOfst; } } free(ax); /* Output the yy_action table */ fprintf(out,"static const YYACTIONTYPE yy_action[] = {\n"); lineno++; n = acttab_size(pActtab); for(i=j=0; insymbol + lemp->nrule + 2; if( j==0 ) fprintf(out," /* %5d */ ", i); fprintf(out, " %4d,", action); if( j==9 || i==n-1 ){ fprintf(out, "\n"); lineno++; j = 0; }else{ j++; } } fprintf(out, "};\n"); lineno++; /* Output the yy_lookahead table */ fprintf(out,"static const YYCODETYPE yy_lookahead[] = {\n"); lineno++; for(i=j=0; insymbol; if( j==0 ) fprintf(out," /* %5d */ ", i); fprintf(out, " %4d,", la); if( j==9 || i==n-1 ){ fprintf(out, "\n"); lineno++; j = 0; }else{ j++; } } fprintf(out, "};\n"); lineno++; /* Output the yy_shift_ofst[] table */ fprintf(out, "#define YY_SHIFT_USE_DFLT (%d)\n", mnTknOfst-1); lineno++; n = lemp->nstate; while( n>0 && lemp->sorted[n-1]->iTknOfst==NO_OFFSET ) n--; fprintf(out, "#define YY_SHIFT_MAX %d\n", n-1); lineno++; fprintf(out, "static const %s yy_shift_ofst[] = {\n", minimum_size_type(mnTknOfst-1, mxTknOfst)); lineno++; for(i=j=0; isorted[i]; ofst = stp->iTknOfst; if( ofst==NO_OFFSET ) ofst = mnTknOfst - 1; if( j==0 ) fprintf(out," /* %5d */ ", i); fprintf(out, " %4d,", ofst); if( j==9 || i==n-1 ){ fprintf(out, "\n"); lineno++; j = 0; }else{ j++; } } fprintf(out, "};\n"); lineno++; /* Output the yy_reduce_ofst[] table */ fprintf(out, "#define YY_REDUCE_USE_DFLT (%d)\n", mnNtOfst-1); lineno++; n = lemp->nstate; while( n>0 && lemp->sorted[n-1]->iNtOfst==NO_OFFSET ) n--; fprintf(out, "#define YY_REDUCE_MAX %d\n", n-1); lineno++; fprintf(out, "static const %s yy_reduce_ofst[] = {\n", minimum_size_type(mnNtOfst-1, mxNtOfst)); lineno++; for(i=j=0; isorted[i]; ofst = stp->iNtOfst; if( ofst==NO_OFFSET ) ofst = mnNtOfst - 1; if( j==0 ) fprintf(out," /* %5d */ ", i); fprintf(out, " %4d,", ofst); if( j==9 || i==n-1 ){ fprintf(out, "\n"); lineno++; j = 0; }else{ j++; } } fprintf(out, "};\n"); lineno++; /* Output the default action table */ fprintf(out, "static const YYACTIONTYPE yy_default[] = {\n"); lineno++; n = lemp->nstate; for(i=j=0; isorted[i]; if( j==0 ) fprintf(out," /* %5d */ ", i); fprintf(out, " %4d,", stp->iDflt); if( j==9 || i==n-1 ){ fprintf(out, "\n"); lineno++; j = 0; }else{ j++; } } fprintf(out, "};\n"); lineno++; tplt_xfer(lemp->name,in,out,&lineno); /* Generate the table of fallback tokens. */ if( lemp->has_fallback ){ for(i=0; interminal; i++){ struct symbol *p = lemp->symbols[i]; if( p->fallback==0 ){ fprintf(out, " 0, /* %10s => nothing */\n", p->name); }else{ fprintf(out, " %3d, /* %10s => %s */\n", p->fallback->index, p->name, p->fallback->name); } lineno++; } } tplt_xfer(lemp->name, in, out, &lineno); /* Generate a table containing the symbolic name of every symbol */ for(i=0; insymbol; i++){ sprintf(line,"\"%s\",",lemp->symbols[i]->name); fprintf(out," %-15s",line); if( (i&3)==3 ){ fprintf(out,"\n"); lineno++; } } if( (i&3)!=0 ){ fprintf(out,"\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate a table containing a text string that describes every ** rule in the rule set of the grammer. This information is used ** when tracing REDUCE actions. */ for(i=0, rp=lemp->rule; rp; rp=rp->next, i++){ assert( rp->index==i ); fprintf(out," /* %3d */ \"%s ::=", i, rp->lhs->name); for(j=0; jnrhs; j++){ struct symbol *sp = rp->rhs[j]; fprintf(out," %s", sp->name); if( sp->type==MULTITERMINAL ){ int k; for(k=1; knsubsym; k++){ fprintf(out,"|%s",sp->subsym[k]->name); } } } fprintf(out,"\",\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which executes every time a symbol is popped from ** the stack while processing errors or while destroying the parser. ** (In other words, generate the %destructor actions) */ if( lemp->tokendest ){ for(i=0; insymbol; i++){ struct symbol *sp = lemp->symbols[i]; if( sp==0 || sp->type!=TERMINAL ) continue; fprintf(out," case %d:\n",sp->index); lineno++; } for(i=0; insymbol && lemp->symbols[i]->type!=TERMINAL; i++); if( insymbol ){ emit_destructor_code(out,lemp->symbols[i],lemp,&lineno); fprintf(out," break;\n"); lineno++; } } if( lemp->vardest ){ struct symbol *dflt_sp = 0; for(i=0; insymbol; i++){ struct symbol *sp = lemp->symbols[i]; if( sp==0 || sp->type==TERMINAL || sp->index<=0 || sp->destructor!=0 ) continue; fprintf(out," case %d:\n",sp->index); lineno++; dflt_sp = sp; } if( dflt_sp!=0 ){ emit_destructor_code(out,dflt_sp,lemp,&lineno); fprintf(out," break;\n"); lineno++; } } for(i=0; insymbol; i++){ struct symbol *sp = lemp->symbols[i]; if( sp==0 || sp->type==TERMINAL || sp->destructor==0 ) continue; fprintf(out," case %d:\n",sp->index); lineno++; /* Combine duplicate destructors into a single case */ for(j=i+1; jnsymbol; j++){ struct symbol *sp2 = lemp->symbols[j]; if( sp2 && sp2->type!=TERMINAL && sp2->destructor && sp2->dtnum==sp->dtnum && strcmp(sp->destructor,sp2->destructor)==0 ){ fprintf(out," case %d:\n",sp2->index); lineno++; sp2->destructor = 0; } } emit_destructor_code(out,lemp->symbols[i],lemp,&lineno); fprintf(out," break;\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which executes whenever the parser stack overflows */ tplt_print(out,lemp,lemp->overflow,lemp->overflowln,&lineno); tplt_xfer(lemp->name,in,out,&lineno); /* Generate the table of rule information ** ** Note: This code depends on the fact that rules are number ** sequentually beginning with 0. */ for(rp=lemp->rule; rp; rp=rp->next){ fprintf(out," { %d, %d },\n",rp->lhs->index,rp->nrhs); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which execution during each REDUCE action */ for(rp=lemp->rule; rp; rp=rp->next){ if( rp->code ) translate_code(lemp, rp); } for(rp=lemp->rule; rp; rp=rp->next){ struct rule *rp2; if( rp->code==0 ) continue; fprintf(out," case %d:\n",rp->index); lineno++; for(rp2=rp->next; rp2; rp2=rp2->next){ if( rp2->code==rp->code ){ fprintf(out," case %d:\n",rp2->index); lineno++; rp2->code = 0; } } emit_code(out,rp,lemp,&lineno); fprintf(out," break;\n"); lineno++; } tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which executes if a parse fails */ tplt_print(out,lemp,lemp->failure,lemp->failureln,&lineno); tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which executes when a syntax error occurs */ tplt_print(out,lemp,lemp->error,lemp->errorln,&lineno); tplt_xfer(lemp->name,in,out,&lineno); /* Generate code which executes when the parser accepts its input */ tplt_print(out,lemp,lemp->accept,lemp->acceptln,&lineno); tplt_xfer(lemp->name,in,out,&lineno); /* Append any addition code the user desires */ tplt_print(out,lemp,lemp->extracode,lemp->extracodeln,&lineno); fclose(in); fclose(out); return; } /* Generate a header file for the parser */ void ReportHeader(lemp) struct lemon *lemp; { FILE *out, *in; char *prefix; char line[LINESIZE]; char pattern[LINESIZE]; int i; if( lemp->tokenprefix ) prefix = lemp->tokenprefix; else prefix = ""; in = file_open(lemp,".h","rb"); if( in ){ for(i=1; interminal && fgets(line,LINESIZE,in); i++){ sprintf(pattern,"#define %s%-30s %2d\n",prefix,lemp->symbols[i]->name,i); if( strcmp(line,pattern) ) break; } fclose(in); if( i==lemp->nterminal ){ /* No change in the file. Don't rewrite it. */ return; } } out = file_open(lemp,".h","wb"); if( out ){ for(i=1; interminal; i++){ fprintf(out,"#define %s%-30s %2d\n",prefix,lemp->symbols[i]->name,i); } fclose(out); } return; } /* Reduce the size of the action tables, if possible, by making use ** of defaults. ** ** In this version, we take the most frequent REDUCE action and make ** it the default. Except, there is no default if the wildcard token ** is a possible look-ahead. */ void CompressTables(lemp) struct lemon *lemp; { struct state *stp; struct action *ap, *ap2; struct rule *rp, *rp2, *rbest; int nbest, n; int i; int usesWildcard; for(i=0; instate; i++){ stp = lemp->sorted[i]; nbest = 0; rbest = 0; usesWildcard = 0; for(ap=stp->ap; ap; ap=ap->next){ if( ap->type==SHIFT && ap->sp==lemp->wildcard ){ usesWildcard = 1; } if( ap->type!=REDUCE ) continue; rp = ap->x.rp; if( rp==rbest ) continue; n = 1; for(ap2=ap->next; ap2; ap2=ap2->next){ if( ap2->type!=REDUCE ) continue; rp2 = ap2->x.rp; if( rp2==rbest ) continue; if( rp2==rp ) n++; } if( n>nbest ){ nbest = n; rbest = rp; } } /* Do not make a default if the number of rules to default ** is not at least 1 or if the wildcard token is a possible ** lookahead. */ if( nbest<1 || usesWildcard ) continue; /* Combine matching REDUCE actions into a single default */ for(ap=stp->ap; ap; ap=ap->next){ if( ap->type==REDUCE && ap->x.rp==rbest ) break; } assert( ap ); ap->sp = Symbol_new("{default}"); for(ap=ap->next; ap; ap=ap->next){ if( ap->type==REDUCE && ap->x.rp==rbest ) ap->type = NOT_USED; } stp->ap = Action_sort(stp->ap); } } /* ** Compare two states for sorting purposes. The smaller state is the ** one with the most non-terminal actions. If they have the same number ** of non-terminal actions, then the smaller is the one with the most ** token actions. */ static int stateResortCompare(const void *a, const void *b){ const struct state *pA = *(const struct state**)a; const struct state *pB = *(const struct state**)b; int n; n = pB->nNtAct - pA->nNtAct; if( n==0 ){ n = pB->nTknAct - pA->nTknAct; } return n; } /* ** Renumber and resort states so that states with fewer choices ** occur at the end. Except, keep state 0 as the first state. */ void ResortStates(lemp) struct lemon *lemp; { int i; struct state *stp; struct action *ap; for(i=0; instate; i++){ stp = lemp->sorted[i]; stp->nTknAct = stp->nNtAct = 0; stp->iDflt = lemp->nstate + lemp->nrule; stp->iTknOfst = NO_OFFSET; stp->iNtOfst = NO_OFFSET; for(ap=stp->ap; ap; ap=ap->next){ if( compute_action(lemp,ap)>=0 ){ if( ap->sp->indexnterminal ){ stp->nTknAct++; }else if( ap->sp->indexnsymbol ){ stp->nNtAct++; }else{ stp->iDflt = compute_action(lemp, ap); } } } } qsort(&lemp->sorted[1], lemp->nstate-1, sizeof(lemp->sorted[0]), stateResortCompare); for(i=0; instate; i++){ lemp->sorted[i]->statenum = i; } } /***************** From the file "set.c" ************************************/ /* ** Set manipulation routines for the LEMON parser generator. */ static int size = 0; /* Set the set size */ void SetSize(n) int n; { size = n+1; } /* Allocate a new set */ char *SetNew(){ char *s; int i; s = (char*)malloc( size ); if( s==0 ){ extern void memory_error(); memory_error(); } for(i=0; isize = 1024; x1a->count = 0; x1a->tbl = (x1node*)malloc( (sizeof(x1node) + sizeof(x1node*))*1024 ); if( x1a->tbl==0 ){ free(x1a); x1a = 0; }else{ int i; x1a->ht = (x1node**)&(x1a->tbl[1024]); for(i=0; i<1024; i++) x1a->ht[i] = 0; } } } /* Insert a new record into the array. Return TRUE if successful. ** Prior data with the same key is NOT overwritten */ int Strsafe_insert(data) char *data; { x1node *np; int h; int ph; if( x1a==0 ) return 0; ph = strhash(data); h = ph & (x1a->size-1); np = x1a->ht[h]; while( np ){ if( strcmp(np->data,data)==0 ){ /* An existing entry with the same key is found. */ /* Fail because overwrite is not allows. */ return 0; } np = np->next; } if( x1a->count>=x1a->size ){ /* Need to make the hash table bigger */ int i,size; struct s_x1 array; array.size = size = x1a->size*2; array.count = x1a->count; array.tbl = (x1node*)malloc( (sizeof(x1node) + sizeof(x1node*))*size ); if( array.tbl==0 ) return 0; /* Fail due to malloc failure */ array.ht = (x1node**)&(array.tbl[size]); for(i=0; icount; i++){ x1node *oldnp, *newnp; oldnp = &(x1a->tbl[i]); h = strhash(oldnp->data) & (size-1); newnp = &(array.tbl[i]); if( array.ht[h] ) array.ht[h]->from = &(newnp->next); newnp->next = array.ht[h]; newnp->data = oldnp->data; newnp->from = &(array.ht[h]); array.ht[h] = newnp; } free(x1a->tbl); *x1a = array; } /* Insert the new data */ h = ph & (x1a->size-1); np = &(x1a->tbl[x1a->count++]); np->data = data; if( x1a->ht[h] ) x1a->ht[h]->from = &(np->next); np->next = x1a->ht[h]; x1a->ht[h] = np; np->from = &(x1a->ht[h]); return 1; } /* Return a pointer to data assigned to the given key. Return NULL ** if no such key. */ char *Strsafe_find(key) char *key; { int h; x1node *np; if( x1a==0 ) return 0; h = strhash(key) & (x1a->size-1); np = x1a->ht[h]; while( np ){ if( strcmp(np->data,key)==0 ) break; np = np->next; } return np ? np->data : 0; } /* Return a pointer to the (terminal or nonterminal) symbol "x". ** Create a new symbol if this is the first time "x" has been seen. */ struct symbol *Symbol_new(x) char *x; { struct symbol *sp; sp = Symbol_find(x); if( sp==0 ){ sp = (struct symbol *)malloc( sizeof(struct symbol) ); MemoryCheck(sp); sp->name = Strsafe(x); sp->type = isupper(*x) ? TERMINAL : NONTERMINAL; sp->rule = 0; sp->fallback = 0; sp->prec = -1; sp->assoc = UNK; sp->firstset = 0; sp->lambda = B_FALSE; sp->destructor = 0; sp->datatype = 0; Symbol_insert(sp,sp->name); } return sp; } /* Compare two symbols for working purposes ** ** Symbols that begin with upper case letters (terminals or tokens) ** must sort before symbols that begin with lower case letters ** (non-terminals). Other than that, the order does not matter. ** ** We find experimentally that leaving the symbols in their original ** order (the order they appeared in the grammar file) gives the ** smallest parser tables in SQLite. */ int Symbolcmpp(struct symbol **a, struct symbol **b){ int i1 = (**a).index + 10000000*((**a).name[0]>'Z'); int i2 = (**b).index + 10000000*((**b).name[0]>'Z'); return i1-i2; } /* There is one instance of the following structure for each ** associative array of type "x2". */ struct s_x2 { int size; /* The number of available slots. */ /* Must be a power of 2 greater than or */ /* equal to 1 */ int count; /* Number of currently slots filled */ struct s_x2node *tbl; /* The data stored here */ struct s_x2node **ht; /* Hash table for lookups */ }; /* There is one instance of this structure for every data element ** in an associative array of type "x2". */ typedef struct s_x2node { struct symbol *data; /* The data */ char *key; /* The key */ struct s_x2node *next; /* Next entry with the same hash */ struct s_x2node **from; /* Previous link */ } x2node; /* There is only one instance of the array, which is the following */ static struct s_x2 *x2a; /* Allocate a new associative array */ void Symbol_init(){ if( x2a ) return; x2a = (struct s_x2*)malloc( sizeof(struct s_x2) ); if( x2a ){ x2a->size = 128; x2a->count = 0; x2a->tbl = (x2node*)malloc( (sizeof(x2node) + sizeof(x2node*))*128 ); if( x2a->tbl==0 ){ free(x2a); x2a = 0; }else{ int i; x2a->ht = (x2node**)&(x2a->tbl[128]); for(i=0; i<128; i++) x2a->ht[i] = 0; } } } /* Insert a new record into the array. Return TRUE if successful. ** Prior data with the same key is NOT overwritten */ int Symbol_insert(data,key) struct symbol *data; char *key; { x2node *np; int h; int ph; if( x2a==0 ) return 0; ph = strhash(key); h = ph & (x2a->size-1); np = x2a->ht[h]; while( np ){ if( strcmp(np->key,key)==0 ){ /* An existing entry with the same key is found. */ /* Fail because overwrite is not allows. */ return 0; } np = np->next; } if( x2a->count>=x2a->size ){ /* Need to make the hash table bigger */ int i,size; struct s_x2 array; array.size = size = x2a->size*2; array.count = x2a->count; array.tbl = (x2node*)malloc( (sizeof(x2node) + sizeof(x2node*))*size ); if( array.tbl==0 ) return 0; /* Fail due to malloc failure */ array.ht = (x2node**)&(array.tbl[size]); for(i=0; icount; i++){ x2node *oldnp, *newnp; oldnp = &(x2a->tbl[i]); h = strhash(oldnp->key) & (size-1); newnp = &(array.tbl[i]); if( array.ht[h] ) array.ht[h]->from = &(newnp->next); newnp->next = array.ht[h]; newnp->key = oldnp->key; newnp->data = oldnp->data; newnp->from = &(array.ht[h]); array.ht[h] = newnp; } free(x2a->tbl); *x2a = array; } /* Insert the new data */ h = ph & (x2a->size-1); np = &(x2a->tbl[x2a->count++]); np->key = key; np->data = data; if( x2a->ht[h] ) x2a->ht[h]->from = &(np->next); np->next = x2a->ht[h]; x2a->ht[h] = np; np->from = &(x2a->ht[h]); return 1; } /* Return a pointer to data assigned to the given key. Return NULL ** if no such key. */ struct symbol *Symbol_find(key) char *key; { int h; x2node *np; if( x2a==0 ) return 0; h = strhash(key) & (x2a->size-1); np = x2a->ht[h]; while( np ){ if( strcmp(np->key,key)==0 ) break; np = np->next; } return np ? np->data : 0; } /* Return the n-th data. Return NULL if n is out of range. */ struct symbol *Symbol_Nth(n) int n; { struct symbol *data; if( x2a && n>0 && n<=x2a->count ){ data = x2a->tbl[n-1].data; }else{ data = 0; } return data; } /* Return the size of the array */ int Symbol_count() { return x2a ? x2a->count : 0; } /* Return an array of pointers to all data in the table. ** The array is obtained from malloc. Return NULL if memory allocation ** problems, or if the array is empty. */ struct symbol **Symbol_arrayof() { struct symbol **array; int i,size; if( x2a==0 ) return 0; size = x2a->count; array = (struct symbol **)malloc( sizeof(struct symbol *)*size ); if( array ){ for(i=0; itbl[i].data; } return array; } /* Compare two configurations */ int Configcmp(a,b) struct config *a; struct config *b; { int x; x = a->rp->index - b->rp->index; if( x==0 ) x = a->dot - b->dot; return x; } /* Compare two states */ PRIVATE int statecmp(a,b) struct config *a; struct config *b; { int rc; for(rc=0; rc==0 && a && b; a=a->bp, b=b->bp){ rc = a->rp->index - b->rp->index; if( rc==0 ) rc = a->dot - b->dot; } if( rc==0 ){ if( a ) rc = 1; if( b ) rc = -1; } return rc; } /* Hash a state */ PRIVATE int statehash(a) struct config *a; { int h=0; while( a ){ h = h*571 + a->rp->index*37 + a->dot; a = a->bp; } return h; } /* Allocate a new state structure */ struct state *State_new() { struct state *new; new = (struct state *)malloc( sizeof(struct state) ); MemoryCheck(new); return new; } /* There is one instance of the following structure for each ** associative array of type "x3". */ struct s_x3 { int size; /* The number of available slots. */ /* Must be a power of 2 greater than or */ /* equal to 1 */ int count; /* Number of currently slots filled */ struct s_x3node *tbl; /* The data stored here */ struct s_x3node **ht; /* Hash table for lookups */ }; /* There is one instance of this structure for every data element ** in an associative array of type "x3". */ typedef struct s_x3node { struct state *data; /* The data */ struct config *key; /* The key */ struct s_x3node *next; /* Next entry with the same hash */ struct s_x3node **from; /* Previous link */ } x3node; /* There is only one instance of the array, which is the following */ static struct s_x3 *x3a; /* Allocate a new associative array */ void State_init(){ if( x3a ) return; x3a = (struct s_x3*)malloc( sizeof(struct s_x3) ); if( x3a ){ x3a->size = 128; x3a->count = 0; x3a->tbl = (x3node*)malloc( (sizeof(x3node) + sizeof(x3node*))*128 ); if( x3a->tbl==0 ){ free(x3a); x3a = 0; }else{ int i; x3a->ht = (x3node**)&(x3a->tbl[128]); for(i=0; i<128; i++) x3a->ht[i] = 0; } } } /* Insert a new record into the array. Return TRUE if successful. ** Prior data with the same key is NOT overwritten */ int State_insert(data,key) struct state *data; struct config *key; { x3node *np; int h; int ph; if( x3a==0 ) return 0; ph = statehash(key); h = ph & (x3a->size-1); np = x3a->ht[h]; while( np ){ if( statecmp(np->key,key)==0 ){ /* An existing entry with the same key is found. */ /* Fail because overwrite is not allows. */ return 0; } np = np->next; } if( x3a->count>=x3a->size ){ /* Need to make the hash table bigger */ int i,size; struct s_x3 array; array.size = size = x3a->size*2; array.count = x3a->count; array.tbl = (x3node*)malloc( (sizeof(x3node) + sizeof(x3node*))*size ); if( array.tbl==0 ) return 0; /* Fail due to malloc failure */ array.ht = (x3node**)&(array.tbl[size]); for(i=0; icount; i++){ x3node *oldnp, *newnp; oldnp = &(x3a->tbl[i]); h = statehash(oldnp->key) & (size-1); newnp = &(array.tbl[i]); if( array.ht[h] ) array.ht[h]->from = &(newnp->next); newnp->next = array.ht[h]; newnp->key = oldnp->key; newnp->data = oldnp->data; newnp->from = &(array.ht[h]); array.ht[h] = newnp; } free(x3a->tbl); *x3a = array; } /* Insert the new data */ h = ph & (x3a->size-1); np = &(x3a->tbl[x3a->count++]); np->key = key; np->data = data; if( x3a->ht[h] ) x3a->ht[h]->from = &(np->next); np->next = x3a->ht[h]; x3a->ht[h] = np; np->from = &(x3a->ht[h]); return 1; } /* Return a pointer to data assigned to the given key. Return NULL ** if no such key. */ struct state *State_find(key) struct config *key; { int h; x3node *np; if( x3a==0 ) return 0; h = statehash(key) & (x3a->size-1); np = x3a->ht[h]; while( np ){ if( statecmp(np->key,key)==0 ) break; np = np->next; } return np ? np->data : 0; } /* Return an array of pointers to all data in the table. ** The array is obtained from malloc. Return NULL if memory allocation ** problems, or if the array is empty. */ struct state **State_arrayof() { struct state **array; int i,size; if( x3a==0 ) return 0; size = x3a->count; array = (struct state **)malloc( sizeof(struct state *)*size ); if( array ){ for(i=0; itbl[i].data; } return array; } /* Hash a configuration */ PRIVATE int confighash(a) struct config *a; { int h=0; h = h*571 + a->rp->index*37 + a->dot; return h; } /* There is one instance of the following structure for each ** associative array of type "x4". */ struct s_x4 { int size; /* The number of available slots. */ /* Must be a power of 2 greater than or */ /* equal to 1 */ int count; /* Number of currently slots filled */ struct s_x4node *tbl; /* The data stored here */ struct s_x4node **ht; /* Hash table for lookups */ }; /* There is one instance of this structure for every data element ** in an associative array of type "x4". */ typedef struct s_x4node { struct config *data; /* The data */ struct s_x4node *next; /* Next entry with the same hash */ struct s_x4node **from; /* Previous link */ } x4node; /* There is only one instance of the array, which is the following */ static struct s_x4 *x4a; /* Allocate a new associative array */ void Configtable_init(){ if( x4a ) return; x4a = (struct s_x4*)malloc( sizeof(struct s_x4) ); if( x4a ){ x4a->size = 64; x4a->count = 0; x4a->tbl = (x4node*)malloc( (sizeof(x4node) + sizeof(x4node*))*64 ); if( x4a->tbl==0 ){ free(x4a); x4a = 0; }else{ int i; x4a->ht = (x4node**)&(x4a->tbl[64]); for(i=0; i<64; i++) x4a->ht[i] = 0; } } } /* Insert a new record into the array. Return TRUE if successful. ** Prior data with the same key is NOT overwritten */ int Configtable_insert(data) struct config *data; { x4node *np; int h; int ph; if( x4a==0 ) return 0; ph = confighash(data); h = ph & (x4a->size-1); np = x4a->ht[h]; while( np ){ if( Configcmp(np->data,data)==0 ){ /* An existing entry with the same key is found. */ /* Fail because overwrite is not allows. */ return 0; } np = np->next; } if( x4a->count>=x4a->size ){ /* Need to make the hash table bigger */ int i,size; struct s_x4 array; array.size = size = x4a->size*2; array.count = x4a->count; array.tbl = (x4node*)malloc( (sizeof(x4node) + sizeof(x4node*))*size ); if( array.tbl==0 ) return 0; /* Fail due to malloc failure */ array.ht = (x4node**)&(array.tbl[size]); for(i=0; icount; i++){ x4node *oldnp, *newnp; oldnp = &(x4a->tbl[i]); h = confighash(oldnp->data) & (size-1); newnp = &(array.tbl[i]); if( array.ht[h] ) array.ht[h]->from = &(newnp->next); newnp->next = array.ht[h]; newnp->data = oldnp->data; newnp->from = &(array.ht[h]); array.ht[h] = newnp; } free(x4a->tbl); *x4a = array; } /* Insert the new data */ h = ph & (x4a->size-1); np = &(x4a->tbl[x4a->count++]); np->data = data; if( x4a->ht[h] ) x4a->ht[h]->from = &(np->next); np->next = x4a->ht[h]; x4a->ht[h] = np; np->from = &(x4a->ht[h]); return 1; } /* Return a pointer to data assigned to the given key. Return NULL ** if no such key. */ struct config *Configtable_find(key) struct config *key; { int h; x4node *np; if( x4a==0 ) return 0; h = confighash(key) & (x4a->size-1); np = x4a->ht[h]; while( np ){ if( Configcmp(np->data,key)==0 ) break; np = np->next; } return np ? np->data : 0; } /* Remove all data from the table. Pass each data to the function "f" ** as it is removed. ("f" may be null to avoid this step.) */ void Configtable_clear(f) int(*f)(/* struct config * */); { int i; if( x4a==0 || x4a->count==0 ) return; if( f ) for(i=0; icount; i++) (*f)(x4a->tbl[i].data); for(i=0; isize; i++) x4a->ht[i] = 0; x4a->count = 0; return; }