X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/427c0dda0c9fb207d8abdd92e3f77f91af9b682d..68cae94e0b4e83246787fc5a413f085513ae9160:/src/lalr.c diff --git a/src/lalr.c b/src/lalr.c index 2c0c942a..65c55ab7 100644 --- a/src/lalr.c +++ b/src/lalr.c @@ -1,6 +1,7 @@ -/* Compute look-ahead criteria for bison, - Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002 - Free Software Foundation, Inc. +/* Compute look-ahead criteria for Bison. + + Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003, 2004, 2005, + 2006 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -16,40 +17,43 @@ You should have received a copy of the GNU General Public License along with Bison; see the file COPYING. If not, write to - the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ /* Compute how to make the finite state machine deterministic; find - which rules need lookahead in each state, and which lookahead + which rules need look-ahead in each state, and which look-ahead tokens they accept. */ +#include #include "system.h" -#include "bitset.h" -#include "bitsetv.h" -#include "relation.h" -#include "quotearg.h" -#include "symtab.h" -#include "gram.h" -#include "reader.h" + +#include +#include +#include + #include "LR0.h" #include "complain.h" -#include "lalr.h" -#include "nullable.h" #include "derives.h" #include "getargs.h" +#include "gram.h" +#include "lalr.h" +#include "nullable.h" +#include "reader.h" +#include "relation.h" +#include "symtab.h" -goto_number_t *goto_map = NULL; -static goto_number_t ngotos = 0; -state_number_t *from_state = NULL; -state_number_t *to_state = NULL; +goto_number *goto_map; +static goto_number ngotos; +state_number *from_state; +state_number *to_state; /* Linked list of goto numbers. */ -typedef struct goto_list_s +typedef struct goto_list { - struct goto_list_s *next; - goto_number_t value; -} goto_list_t; + struct goto_list *next; + goto_number value; +} goto_list; /* LA is a LR by NTOKENS matrix of bits. LA[l, i] is 1 if the rule @@ -65,8 +69,8 @@ size_t nLA; comment is hardly needed. . */ static bitsetv F = NULL; -static goto_number_t **includes; -static goto_list_t **lookback; +static goto_number **includes; +static goto_list **lookback; @@ -74,59 +78,60 @@ static goto_list_t **lookback; static void set_goto_map (void) { - state_number_t state; - goto_number_t *temp_map; + state_number s; + goto_number *temp_map; - goto_map = XCALLOC (goto_number_t, nvars + 1) - ntokens; - temp_map = XCALLOC (goto_number_t, nvars + 1) - ntokens; + goto_map = xcalloc (nvars + 1, sizeof *goto_map); + temp_map = xnmalloc (nvars + 1, sizeof *temp_map); ngotos = 0; - for (state = 0; state < nstates; ++state) + for (s = 0; s < nstates; ++s) { - transitions_t *sp = states[state]->transitions; + transitions *sp = states[s]->transitions; int i; for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i) { - if (ngotos == GOTO_NUMBER_MAX) - fatal (_("too many gotos (max %d)"), GOTO_NUMBER_MAX); - ngotos++; - goto_map[TRANSITION_SYMBOL (sp, i)]++; + + /* Abort if (ngotos + 1) would overflow. */ + assert (ngotos != GOTO_NUMBER_MAXIMUM); + + goto_map[TRANSITION_SYMBOL (sp, i) - ntokens]++; } } { - int k = 0; + goto_number k = 0; int i; for (i = ntokens; i < nsyms; i++) { - temp_map[i] = k; - k += goto_map[i]; + temp_map[i - ntokens] = k; + k += goto_map[i - ntokens]; } for (i = ntokens; i < nsyms; i++) - goto_map[i] = temp_map[i]; + goto_map[i - ntokens] = temp_map[i - ntokens]; - goto_map[nsyms] = ngotos; - temp_map[nsyms] = ngotos; + goto_map[nsyms - ntokens] = ngotos; + temp_map[nsyms - ntokens] = ngotos; } - from_state = XCALLOC (state_number_t, ngotos); - to_state = XCALLOC (state_number_t, ngotos); + from_state = xcalloc (ngotos, sizeof *from_state); + to_state = xcalloc (ngotos, sizeof *to_state); - for (state = 0; state < nstates; ++state) + for (s = 0; s < nstates; ++s) { - transitions_t *sp = states[state]->transitions; + transitions *sp = states[s]->transitions; int i; for (i = sp->num - 1; i >= 0 && TRANSITION_IS_GOTO (sp, i); --i) { - int k = temp_map[TRANSITION_SYMBOL (sp, i)]++; - from_state[k] = state; + goto_number k = temp_map[TRANSITION_SYMBOL (sp, i) - ntokens]++; + from_state[k] = s; to_state[k] = sp->states[i]->number; } } - XFREE (temp_map + ntokens); + free (temp_map); } @@ -135,50 +140,47 @@ set_goto_map (void) | Map a state/symbol pair into its numeric representation. | `----------------------------------------------------------*/ -static int -map_goto (state_number_t state, symbol_number_t symbol) +static goto_number +map_goto (state_number s0, symbol_number sym) { - int high; - int low; - int middle; - state_number_t s; + goto_number high; + goto_number low; + goto_number middle; + state_number s; - low = goto_map[symbol]; - high = goto_map[symbol + 1] - 1; + low = goto_map[sym - ntokens]; + high = goto_map[sym - ntokens + 1] - 1; - while (low <= high) + for (;;) { + assert (low <= high); middle = (low + high) / 2; s = from_state[middle]; - if (s == state) + if (s == s0) return middle; - else if (s < state) + else if (s < s0) low = middle + 1; else high = middle - 1; } - - assert (0); - /* NOTREACHED */ - return 0; } static void initialize_F (void) { - goto_number_t **reads = XCALLOC (goto_number_t *, ngotos); - goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1); - int nedges = 0; + goto_number **reads = xnmalloc (ngotos, sizeof *reads); + goto_number *edge = xnmalloc (ngotos + 1, sizeof *edge); + goto_number nedges = 0; - int i; + goto_number i; F = bitsetv_create (ngotos, ntokens, BITSET_FIXED); for (i = 0; i < ngotos; i++) { - state_number_t stateno = to_state[i]; - transitions_t *sp = states[stateno]->transitions; + state_number stateno = to_state[i]; + transitions *sp = states[stateno]->transitions; int j; FOR_EACH_SHIFT (sp, j) @@ -186,16 +188,18 @@ initialize_F (void) for (; j < sp->num; j++) { - symbol_number_t symbol = TRANSITION_SYMBOL (sp, j); - if (nullable[symbol]) - edge[nedges++] = map_goto (stateno, symbol); + symbol_number sym = TRANSITION_SYMBOL (sp, j); + if (nullable[sym - ntokens]) + edge[nedges++] = map_goto (stateno, sym); } - if (nedges) + if (nedges == 0) + reads[i] = NULL; + else { - reads[i] = XCALLOC (goto_number_t, nedges + 1); - memcpy (reads[i], edge, nedges * sizeof (edge[0])); - reads[i][nedges] = -1; + reads[i] = xnmalloc (nedges + 1, sizeof reads[i][0]); + memcpy (reads[i], edge, nedges * sizeof edge[0]); + reads[i][nedges] = END_NODE; nedges = 0; } } @@ -203,21 +207,21 @@ initialize_F (void) relation_digraph (reads, ngotos, &F); for (i = 0; i < ngotos; i++) - XFREE (reads[i]); + free (reads[i]); - XFREE (reads); - XFREE (edge); + free (reads); + free (edge); } static void -add_lookback_edge (state_t *state, rule_t *rule, int gotono) +add_lookback_edge (state *s, rule *r, goto_number gotono) { - int r = state_reduction_find (state, rule); - goto_list_t *sp = XCALLOC (goto_list_t, 1); - sp->next = lookback[(state->reductions->lookaheads - LA) + r]; + int ri = state_reduction_find (s, r); + goto_list *sp = xmalloc (sizeof *sp); + sp->next = lookback[(s->reductions->look_ahead_tokens - LA) + ri]; sp->value = gotono; - lookback[(state->reductions->lookaheads - LA) + r] = sp; + lookback[(s->reductions->look_ahead_tokens - LA) + ri] = sp; } @@ -225,66 +229,70 @@ add_lookback_edge (state_t *state, rule_t *rule, int gotono) static void build_relations (void) { - goto_number_t *edge = XCALLOC (goto_number_t, ngotos + 1); - state_number_t *states1 = XCALLOC (state_number_t, ritem_longest_rhs () + 1); - int i; + goto_number *edge = xnmalloc (ngotos + 1, sizeof *edge); + state_number *states1 = xnmalloc (ritem_longest_rhs () + 1, sizeof *states1); + goto_number i; - includes = XCALLOC (goto_number_t *, ngotos); + includes = xnmalloc (ngotos, sizeof *includes); for (i = 0; i < ngotos; i++) { int nedges = 0; - symbol_number_t symbol1 = states[to_state[i]]->accessing_symbol; - rule_t **rulep; + symbol_number symbol1 = states[to_state[i]]->accessing_symbol; + rule **rulep; - for (rulep = derives[symbol1]; *rulep; rulep++) + for (rulep = derives[symbol1 - ntokens]; *rulep; rulep++) { - int done; + bool done; int length = 1; - item_number_t *rp; - state_t *state = states[from_state[i]]; - states1[0] = state->number; + item_number const *rp; + state *s = states[from_state[i]]; + states1[0] = s->number; - for (rp = (*rulep)->rhs; *rp >= 0; rp++) + for (rp = (*rulep)->rhs; ! item_number_is_rule_number (*rp); rp++) { - state = transitions_to (state->transitions, - item_number_as_symbol_number (*rp)); - states1[length++] = state->number; + s = transitions_to (s->transitions, + item_number_as_symbol_number (*rp)); + states1[length++] = s->number; } - if (!state->consistent) - add_lookback_edge (state, *rulep, i); + if (!s->consistent) + add_lookback_edge (s, *rulep, i); length--; - done = 0; + done = false; while (!done) { - done = 1; + done = true; + /* Each rhs ends in an item number, and there is a + sentinel before the first rhs, so it is safe to + decrement RP here. */ rp--; - /* JF added rp>=ritem && I hope to god its right! */ - if (rp >= ritem && ISVAR (*rp)) + if (ISVAR (*rp)) { - /* Downcasting from item_number_t to symbol_number_t. */ + /* Downcasting from item_number to symbol_number. */ edge[nedges++] = map_goto (states1[--length], item_number_as_symbol_number (*rp)); - if (nullable[*rp]) - done = 0; + if (nullable[*rp - ntokens]) + done = false; } } } - if (nedges) + if (nedges == 0) + includes[i] = NULL; + else { int j; - includes[i] = XCALLOC (goto_number_t, nedges + 1); + includes[i] = xnmalloc (nedges + 1, sizeof includes[i][0]); for (j = 0; j < nedges; j++) includes[i][j] = edge[j]; - includes[i][nedges] = -1; + includes[i][nedges] = END_NODE; } } - XFREE (edge); - XFREE (states1); + free (edge); + free (states1); relation_transpose (&includes, ngotos); } @@ -294,22 +302,22 @@ build_relations (void) static void compute_FOLLOWS (void) { - int i; + goto_number i; relation_digraph (includes, ngotos, &F); for (i = 0; i < ngotos; i++) - XFREE (includes[i]); + free (includes[i]); - XFREE (includes); + free (includes); } static void -compute_lookaheads (void) +compute_look_ahead_tokens (void) { size_t i; - goto_list_t *sp; + goto_list *sp; for (i = 0; i < nLA; i++) for (sp = lookback[i]; sp; sp = sp->next) @@ -317,117 +325,117 @@ compute_lookaheads (void) /* Free LOOKBACK. */ for (i = 0; i < nLA; i++) - LIST_FREE (goto_list_t, lookback[i]); + LIST_FREE (goto_list, lookback[i]); - XFREE (lookback); + free (lookback); bitsetv_free (F); } -/*---------------------------------------------------------------. -| Count the number of lookaheads required for STATE (NLOOKAHEADS | -| member). | -`---------------------------------------------------------------*/ +/*-----------------------------------------------------. +| Count the number of look-ahead tokens required for S | +| (N_LOOK_AHEAD_TOKENS member). | +`-----------------------------------------------------*/ static int -state_lookaheads_count (state_t *state) +state_look_ahead_tokens_count (state *s) { int k; - int nlookaheads = 0; - reductions_t *rp = state->reductions; - transitions_t *sp = state->transitions; + int n_look_ahead_tokens = 0; + reductions *rp = s->reductions; + transitions *sp = s->transitions; - /* We need a lookahead either to distinguish different + /* We need a look-ahead either to distinguish different reductions (i.e., there are two or more), or to distinguish a reduction from a shift. Otherwise, it is straightforward, and the state is `consistent'. */ if (rp->num > 1 || (rp->num == 1 && sp->num && !TRANSITION_IS_DISABLED (sp, 0) && TRANSITION_IS_SHIFT (sp, 0))) - nlookaheads += rp->num; + n_look_ahead_tokens += rp->num; else - state->consistent = 1; + s->consistent = 1; for (k = 0; k < sp->num; k++) if (!TRANSITION_IS_DISABLED (sp, k) && TRANSITION_IS_ERROR (sp, k)) { - state->consistent = 0; + s->consistent = 0; break; } - return nlookaheads; + return n_look_ahead_tokens; } -/*----------------------------------------------. -| Compute LA, NLA, and the lookaheads members. | -`----------------------------------------------*/ +/*-----------------------------------------------------. +| Compute LA, NLA, and the look_ahead_tokens members. | +`-----------------------------------------------------*/ static void initialize_LA (void) { - state_number_t i; + state_number i; bitsetv pLA; - /* Compute the total number of reductions requiring a lookahead. */ + /* Compute the total number of reductions requiring a look-ahead. */ nLA = 0; for (i = 0; i < nstates; i++) - nLA += state_lookaheads_count (states[i]); + nLA += state_look_ahead_tokens_count (states[i]); /* Avoid having to special case 0. */ if (!nLA) nLA = 1; pLA = LA = bitsetv_create (nLA, ntokens, BITSET_FIXED); - lookback = XCALLOC (goto_list_t *, nLA); + lookback = xcalloc (nLA, sizeof *lookback); - /* Initialize the members LOOKAHEADS for each state which reductions - require lookaheads. */ + /* Initialize the members LOOK_AHEAD_TOKENS for each state whose reductions + require look-ahead tokens. */ for (i = 0; i < nstates; i++) { - int count = state_lookaheads_count (states[i]); + int count = state_look_ahead_tokens_count (states[i]); if (count) { - states[i]->reductions->lookaheads = pLA; + states[i]->reductions->look_ahead_tokens = pLA; pLA += count; } } } -/*---------------------------------------. -| Output the lookaheads for each state. | -`---------------------------------------*/ +/*----------------------------------------------. +| Output the look-ahead tokens for each state. | +`----------------------------------------------*/ static void -lookaheads_print (FILE *out) +look_ahead_tokens_print (FILE *out) { - state_number_t i; + state_number i; int j, k; - fprintf (out, "Lookaheads: BEGIN\n"); + fprintf (out, "Look-ahead tokens: BEGIN\n"); for (i = 0; i < nstates; ++i) { - reductions_t *reds = states[i]->reductions; + reductions *reds = states[i]->reductions; bitset_iterator iter; - int nlookaheads = 0; + int n_look_ahead_tokens = 0; - if (reds->lookaheads) + if (reds->look_ahead_tokens) for (k = 0; k < reds->num; ++k) - if (reds->lookaheads[k]) - ++nlookaheads; + if (reds->look_ahead_tokens[k]) + ++n_look_ahead_tokens; - fprintf (out, "State %d: %d lookaheads\n", - i, nlookaheads); + fprintf (out, "State %d: %d look-ahead tokens\n", + i, n_look_ahead_tokens); - if (reds->lookaheads) + if (reds->look_ahead_tokens) for (j = 0; j < reds->num; ++j) - BITSET_FOR_EACH (iter, reds->lookaheads[j], k, 0) + BITSET_FOR_EACH (iter, reds->look_ahead_tokens[j], k, 0) { fprintf (out, " on %d (%s) -> rule %d\n", k, symbols[k]->tag, reds->rules[j]->number); }; } - fprintf (out, "Lookaheads: END\n"); + fprintf (out, "Look-ahead tokens: END\n"); } void @@ -438,18 +446,18 @@ lalr (void) initialize_F (); build_relations (); compute_FOLLOWS (); - compute_lookaheads (); + compute_look_ahead_tokens (); if (trace_flag & trace_sets) - lookaheads_print (stderr); + look_ahead_tokens_print (stderr); } void lalr_free (void) { - state_number_t s; + state_number s; for (s = 0; s < nstates; ++s) - states[s]->reductions->lookaheads = NULL; + states[s]->reductions->look_ahead_tokens = NULL; bitsetv_free (LA); }