llvm/utils/Burg/plank.c

char rcsid_plank[] = "$Id$";

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "b.h"
#include "fe.h"

#define ERROR_VAL 0

int speedflag = 0;

Item_Set *sortedStates;
static struct stateMapTable smt;
int exceptionTolerance = 0;
static int plankSize = 32;

static Plank newPlank ARGS((void));
static PlankMap newPlankMap ARGS((int));
static StateMap newStateMap ARGS((void));
static Exception newException ARGS((int, int));
static void enterStateMap ARGS((PlankMap, short *, int, int *));
static List assemblePlanks ARGS((void));
static void assignRules ARGS((RuleAST));
static int stateCompare ARGS((Item_Set *, Item_Set *));
static int ruleCompare ARGS((RuleAST *, RuleAST *));
static void renumber ARGS((void));
static short * newVector ARGS((void));
static int width ARGS((int));
static PlankMap mapToPmap ARGS((Dimension));
static void doDimPmaps ARGS((Operator));
static void doNonTermPmaps ARGS((NonTerminal));
static void makePmaps ARGS((void));
static void outPlank ARGS((Plank));
static void purgePlanks ARGS((List));
static void inToEx ARGS((void));
static void makePlankRuleMacros ARGS((void));
static void makePlankRule ARGS((void));
static void exceptionSwitch ARGS((List, const char *, const char *, const char *, int, const char *));
static void doPlankLabel ARGS((Operator));
static void doPlankLabelSafely ARGS((Operator));
static void doPlankLabelMacrosSafely ARGS((Operator));
static void makePlankState ARGS((void));

static Plank
newPlank()
{
  Plank p;
  char buf[50];
  static int num = 0;

  p = (Plank) zalloc(sizeof(struct plank));
  sprintf(buf, "%s_plank_%d", prefix, num++);
  p->name = (char *) zalloc(strlen(buf)+1);
  strcpy(p->name, buf);
  return p;
}

static PlankMap
newPlankMap(offset) int offset;
{
  PlankMap im;

  im = (PlankMap) zalloc(sizeof(struct plankMap));
  im->offset = offset;
  return im;
}

static StateMap
newStateMap()
{
  char buf[50];
  static int num = 0;

  StateMap sm;

  sm = (StateMap) zalloc(sizeof(struct stateMap));
  sprintf(buf, "f%d", num++);
  sm->fieldname = (char *) zalloc(strlen(buf)+1);
  strcpy(sm->fieldname, buf);
  return sm;
}

static Exception
newException(index, value) int index; int value;
{
  Exception e;

  e = (Exception) zalloc(sizeof(struct except));
  e->index = index;
  e->value = value;
  return e;
}

static void
enterStateMap(im, v, width, new) PlankMap im; short * v; int width; int *new;
{
  int i;
  StateMap sm;
  List l;
  int size;

  assert(im);
  assert(v);
  assert(width > 0);
  size = globalMap->count;

  for (l = smt.maps; l; l = l->next) {
    int ecount;

    sm = (StateMap) l->x;
    ecount = 0;
    for (i = 0; i < size; i++) {
      if (v[i] != -1 && sm->value[i] != -1 && v[i] != sm->value[i]) {
        if (++ecount > exceptionTolerance) {
          goto again;
        }
      }
    }
    for (i = 0; i < size; i++) {
      assert(v[i] >= 0);
      assert(sm->value[i] >= 0);
      if (v[i] == -1) {
        continue;
      }
      if (sm->value[i] == -1) {
        sm->value[i] = v[i];
      } else if (v[i] != sm->value[i]) {
        im->exceptions = newList(newException(i,v[i]), im->exceptions);
      }
    }
    im->values = sm;
    if (width > sm->width) {
      sm->width = width;
    }
    *new = 0;
    return;
  again: ;
  }
  sm = newStateMap();
  im->values = sm;
  sm->value = v;
  sm->width = width;
  *new = 1;
  smt.maps = newList(sm, smt.maps);
}

static List
assemblePlanks()
{
  List planks = 0;
  Plank pl;
  List p;
  List s;

  for (s = smt.maps; s; s = s->next) {
    StateMap sm = (StateMap) s->x;
    for (p = planks; p; p = p->next) {
      pl = (Plank) p->x;
      if (sm->width <= plankSize - pl->width) {
        pl->width += sm->width;
        pl->fields = newList(sm, pl->fields);
        sm->plank = pl;
        goto next;
      }
    }
    pl = newPlank();
    pl->width = sm->width;
    pl->fields = newList(sm, 0);
    sm->plank = pl;
    planks = appendList(pl, planks);
  next: ;
  }
  return planks;
}

RuleAST *sortedRules;

static int count;

static void
assignRules(ast) RuleAST ast;
{
  sortedRules[count++] = ast;
}

static int
stateCompare(s, t) Item_Set *s; Item_Set *t;
{
  return strcmp((*s)->op->name, (*t)->op->name);
}

static int
ruleCompare(s, t) RuleAST *s; RuleAST *t;
{
  return strcmp((*s)->lhs, (*t)->lhs);
}

void
dumpSortedStates()
{
  int i;

  printf("dump Sorted States: ");
  for (i = 0; i < globalMap->count; i++) {
    printf("%d ", sortedStates[i]->num);
  }
  printf("\n");
}

void
dumpSortedRules()
{
  int i;

  printf("dump Sorted Rules: ");
  for (i = 0; i < max_ruleAST; i++) {
    printf("%d ", sortedRules[i]->rule->erulenum);
  }
  printf("\n");
}

static void
renumber()
{
  int i;
  Operator previousOp;
  NonTerminal previousLHS;
  int base_counter;

  sortedStates = (Item_Set*) zalloc(globalMap->count * sizeof(Item_Set));
  for (i = 1; i < globalMap->count; i++) {
    sortedStates[i-1] = globalMap->set[i];
  }
  qsort(sortedStates, globalMap->count-1, sizeof(Item_Set), (int(*)(const void *, const void *))stateCompare);
  previousOp = 0;
  for (i = 0; i < globalMap->count-1; i++) {
    sortedStates[i]->newNum = i;
    sortedStates[i]->op->stateCount++;
    if (previousOp != sortedStates[i]->op) {
      sortedStates[i]->op->baseNum = i;
      previousOp = sortedStates[i]->op;
    }
  }

  sortedRules = (RuleAST*) zalloc(max_ruleAST * sizeof(RuleAST));
  count = 0;
  foreachList((ListFn) assignRules, ruleASTs);
  qsort(sortedRules, max_ruleAST, sizeof(RuleAST), (int(*)(const void *, const void *))ruleCompare);
  previousLHS = 0;
  base_counter = 0;
  for (i = 0; i < max_ruleAST; i++) {
    if (previousLHS != sortedRules[i]->rule->lhs) {
      sortedRules[i]->rule->lhs->baseNum = base_counter;
      previousLHS = sortedRules[i]->rule->lhs;
      base_counter++; /* make space for 0 */
    }
    sortedRules[i]->rule->newNum = base_counter;
    sortedRules[i]->rule->lhs->ruleCount++;
    sortedRules[i]->rule->lhs->sampleRule = sortedRules[i]->rule; /* kludge for diagnostics */
    base_counter++;
  }
}

static short *
newVector()
{
  short *p;
  p = (short *) zalloc(globalMap->count* sizeof(short));
  return p;
}

static int
width(v) int v;
{
  int c;

  for (c = 0; v; v >>= 1) {
    c++;
  }
  return c;

}

static PlankMap
mapToPmap(d) Dimension d;
{
  PlankMap im;
  short *v;
  int i;
  int new;

  if (d->map->count == 1) {
    return 0;
  }
  assert(d->map->count > 1);
  im = newPlankMap(0);
  v = newVector();
  for (i = 0; i < globalMap->count-1; i++) {
    int index = d->map->set[d->index_map.class[sortedStates[i]->num]->num]->num;
    assert(index >= 0);
    v[i+1] = index;
  }
  v[0] = 0;
  enterStateMap(im, v, width(d->map->count), &new);
  if (!new) {
    zfree(v);
  }
  return im;
}

static void
doDimPmaps(op) Operator op;
{
  int i, j;
  Dimension d;
  short *v;
  PlankMap im;
  int new;

  if (!op->table->rules) {
    return;
  }
  switch (op->arity) {
  case 0:
    break;
  case 1:
    d = op->table->dimen[0];
    if (d->map->count > 1) {
      v = newVector();
      im = newPlankMap(op->baseNum);
      for (i = 0; i < globalMap->count-1; i++) {
        int index = d->map->set[d->index_map.class[sortedStates[i]->num]->num]->num;
        if (index) {
          Item_Set *ts = transLval(op->table, index, 0);
          v[i+1] = (*ts)->newNum - op->baseNum+1;
          assert(v[i+1] >= 0);
        }
      }
      enterStateMap(im, v, width(d->map->count-1), &new);
      if (!new) {
        zfree(v);
      }
      d->pmap = im;
    }
    break;
  case 2:
    if (op->table->dimen[0]->map->count == 1 && op->table->dimen[1]->map->count == 1) {
      op->table->dimen[0]->pmap = 0;
      op->table->dimen[1]->pmap = 0;
    } else if (op->table->dimen[0]->map->count == 1) {
      v = newVector();
      im = newPlankMap(op->baseNum);
      d = op->table->dimen[1];
      for (i = 0; i < globalMap->count-1; i++) {
        int index = d->map->set[d->index_map.class[sortedStates[i]->num]->num]->num;
        if (index) {
          Item_Set *ts = transLval(op->table, 1, index);
          v[i+1] = (*ts)->newNum - op->baseNum+1;
          assert(v[i+1] >= 0);
        }
      }
      enterStateMap(im, v, width(d->map->count-1), &new);
      if (!new) {
        zfree(v);
      }
      d->pmap = im;
    } else if (op->table->dimen[1]->map->count == 1) {
      v = newVector();
      im = newPlankMap(op->baseNum);
      d = op->table->dimen[0];
      for (i = 0; i < globalMap->count-1; i++) {
        int index = d->map->set[d->index_map.class[sortedStates[i]->num]->num]->num;
        if (index) {
          Item_Set *ts = transLval(op->table, index, 1);
          v[i +1] = (*ts)->newNum - op->baseNum +1;
          assert(v[i +1] >= 0);
        }
      }
      enterStateMap(im, v, width(d->map->count-1), &new);
      if (!new) {
        zfree(v);
      }
      d->pmap = im;
    } else {
      op->table->dimen[0]->pmap = mapToPmap(op->table->dimen[0]);
      op->table->dimen[1]->pmap = mapToPmap(op->table->dimen[1]);
      /* output table */
      fprintf(outfile, "static unsigned %s %s_%s_transition[%d][%d] = {",
        op->stateCount <= 255 ? "char" : "short",
        prefix,
        op->name,
        op->table->dimen[0]->map->count,
        op->table->dimen[1]->map->count);
      for (i = 0; i < op->table->dimen[0]->map->count; i++) {
        if (i > 0) {
          fprintf(outfile, ",");
        }
        fprintf(outfile, "\n{");
        for (j = 0; j < op->table->dimen[1]->map->count; j++) {
          Item_Set *ts = transLval(op->table, i, j);
          short diff;
          if (j > 0) {
            fprintf(outfile, ",");
            if (j % 10 == 0) {
              fprintf(outfile, "\t/* row %d, cols %d-%d*/\n",
                i,
                j-10,
                j-1);
            }
          }
          if ((*ts)->num > 0) {
            diff = (*ts)->newNum - op->baseNum +1;
          } else {
            diff = 0;
          }
          fprintf(outfile, "%5d", diff);
        }
        fprintf(outfile, "}\t/* row %d */", i);
      }
      fprintf(outfile, "\n};\n");
    }
    break;
  default:
    assert(0);
  }
}

static NonTerminal *ntVector;

static void
doNonTermPmaps(n) NonTerminal n;
{
  short *v;
  PlankMap im;
  int new;
  int i;

  ntVector[n->num] = n;
  if (n->num >= last_user_nonterminal) {
    return;
  }
  if (n->ruleCount <= 0) {
    return;
  }
  im = newPlankMap(n->baseNum);
  v = newVector();
  for (i = 0; i < globalMap->count-1; i++) {
    Rule r = globalMap->set[sortedStates[i]->num]->closed[n->num].rule;
    if (r) {
      r->used = 1;
      v[i+1] = r->newNum - n->baseNum /*safely*/;
      assert(v[i+1] >= 0);
    }
  }
  enterStateMap(im, v, width(n->ruleCount+1), &new);
  if (!new) {
    zfree(v);
  }
  n->pmap = im;
}

static void
makePmaps()
{
  foreachList((ListFn) doDimPmaps, operators);
  ntVector = (NonTerminal*) zalloc((max_nonterminal) * sizeof(NonTerminal));
  foreachList((ListFn) doNonTermPmaps, nonterminals);
}

static void
outPlank(p) Plank p;
{
  List f;
  int i;

  fprintf(outfile, "static struct {\n");

  for (f = p->fields; f; f = f->next) {
    StateMap sm = (StateMap) f->x;
    fprintf(outfile, "\tunsigned int %s:%d;\n", sm->fieldname, sm->width);
  }

  fprintf(outfile, "} %s[] = {\n", p->name);

  for (i = 0; i < globalMap->count; i++) {
    fprintf(outfile, "\t{");
    for (f = p->fields; f; f = f->next) {
      StateMap sm = (StateMap) f->x;
      fprintf(outfile, "%4d,", sm->value[i] == -1 ? ERROR_VAL : sm->value[i]);
    }
    fprintf(outfile, "},\t/* row %d */\n", i);
  }

  fprintf(outfile, "};\n");
}

static void
purgePlanks(planks) List planks;
{
  List p;

  for (p = planks; p; p = p->next) {
    Plank x = (Plank) p->x;
    outPlank(x);
  }
}

static void
inToEx()
{
  int i;
  int counter;

  fprintf(outfile, "static short %s_eruleMap[] = {\n", prefix);
  counter = 0;
  for (i = 0; i < max_ruleAST; i++) {
    if (counter > 0) {
      fprintf(outfile, ",");
      if (counter % 10 == 0) {
        fprintf(outfile, "\t/* %d-%d */\n", counter-10, counter-1);
      }
    }
    if (counter < sortedRules[i]->rule->newNum) {
      assert(counter == sortedRules[i]->rule->newNum-1);
      fprintf(outfile, "%5d", 0);
      counter++;
      if (counter > 0) {
        fprintf(outfile, ",");
        if (counter % 10 == 0) {
          fprintf(outfile, "\t/* %d-%d */\n", counter-10, counter-1);
        }
      }
    }
    fprintf(outfile, "%5d", sortedRules[i]->rule->erulenum);
    counter++;
  }
  fprintf(outfile, "\n};\n");
}

static void
makePlankRuleMacros()
{
  int i;

  for (i = 1; i < last_user_nonterminal; i++) {
    List es;
    PlankMap im = ntVector[i]->pmap;
    fprintf(outfile, "#define %s_%s_rule(state)\t", prefix, ntVector[i]->name);
    if (im) {
      fprintf(outfile, "%s_eruleMap[", prefix);
      for (es = im->exceptions; es; es = es->next) {
        Exception e = (Exception) es->x;
        fprintf(outfile, "((state) == %d ? %d :",
            e->index, e->value);
      }
      fprintf(outfile, "%s[state].%s",
        im->values->plank->name,
        im->values->fieldname);
      for (es = im->exceptions; es; es = es->next) {
        fprintf(outfile, ")");
      }
      fprintf(outfile, " +%d]", im->offset);

    } else {
      /* nonterminal never appears on LHS. */
      assert(ntVector[i] ==  start);
      fprintf(outfile, "0");
    }
    fprintf(outfile, "\n");
  }
  fprintf(outfile, "\n");
}

static void
makePlankRule()
{
  int i;

  makePlankRuleMacros();

  fprintf(outfile, "#ifdef __STDC__\n");
  fprintf(outfile, "int %s_rule(int state, int goalnt) {\n", prefix);
  fprintf(outfile, "#else\n");
  fprintf(outfile, "int %s_rule(state, goalnt) int state; int goalnt; {\n", prefix);
  fprintf(outfile, "#endif\n");

  fprintf(outfile,
  "\t%s_assert(state >= 0 && state < %d, %s_PANIC(\"Bad state %%d passed to %s_rule\\n\", state));\n",
        prefix, globalMap->count, prefix, prefix);
  fprintf(outfile, "\tswitch(goalnt) {\n");

  for (i = 1; i < last_user_nonterminal; i++) {
    fprintf(outfile, "\tcase %d:\n", i);
    fprintf(outfile, "\t\treturn %s_%s_rule(state);\n", prefix, ntVector[i]->name);
  }
  fprintf(outfile, "\tdefault:\n");
  fprintf(outfile, "\t\t%s_PANIC(\"Unknown nonterminal %%d in %s_rule;\\n\", goalnt);\n", prefix, prefix);
  fprintf(outfile, "\t\tabort();\n");
  fprintf(outfile, "\t\treturn 0;\n");
  fprintf(outfile, "\t}\n");
  fprintf(outfile, "}\n");
}

static void
exceptionSwitch(es, sw, pre, post, offset, def) List es; const char *sw; const char *pre; const char *post; int offset; const char *def;
{
  if (es) {
    fprintf(outfile, "\t\tswitch (%s) {\n", sw);
    for (; es; es = es->next) {
      Exception e = (Exception) es->x;
      fprintf(outfile, "\t\tcase %d: %s %d; %s\n", e->index, pre, e->value+offset, post);
    }
    if (def) {
      fprintf(outfile, "\t\tdefault: %s;\n", def);
    }
    fprintf(outfile, "\t\t}\n");
  } else {
    if (def) {
      fprintf(outfile, "\t\t%s;\n", def);
    }
  }
}

static void
doPlankLabel(op) Operator op;
{
  PlankMap im0;
  PlankMap im1;
  char buf[100];

  fprintf(outfile, "\tcase %d:\n", op->num);
  switch (op->arity) {
  case 0:
    fprintf(outfile, "\t\treturn %d;\n", op->table->transition[0]->newNum);
    break;
  case 1:
    im0 = op->table->dimen[0]->pmap;
    if (im0) {
      exceptionSwitch(im0->exceptions, "l", "return ", "", im0->offset, 0);
      fprintf(outfile, "\t\treturn %s[l].%s + %d;\n",
        im0->values->plank->name, im0->values->fieldname, im0->offset);
    } else {
      Item_Set *ts = transLval(op->table, 1, 0);
      if (*ts) {
        fprintf(outfile, "\t\treturn %d;\n", (*ts)->newNum);
      } else {
        fprintf(outfile, "\t\treturn %d;\n", ERROR_VAL);
      }
    }
    break;
  case 2:
    im0 = op->table->dimen[0]->pmap;
    im1 = op->table->dimen[1]->pmap;
    if (!im0 && !im1) {
      Item_Set *ts = transLval(op->table, 1, 1);
      if (*ts) {
        fprintf(outfile, "\t\treturn %d;\n", (*ts)->newNum);
      } else {
        fprintf(outfile, "\t\treturn %d;\n", ERROR_VAL);
      }
    } else if (!im0) {
      exceptionSwitch(im1->exceptions, "r", "return ", "", im1->offset, 0);
      fprintf(outfile, "\t\treturn %s[r].%s + %d;\n",
        im1->values->plank->name, im1->values->fieldname, im1->offset);
    } else if (!im1) {
      exceptionSwitch(im0->exceptions, "l", "return ", "", im0->offset, 0);
      fprintf(outfile, "\t\treturn %s[l].%s + %d;\n",
        im0->values->plank->name, im0->values->fieldname, im0->offset);
    } else {
      assert(im0->offset == 0);
      assert(im1->offset == 0);
      sprintf(buf, "l = %s[l].%s",
        im0->values->plank->name, im0->values->fieldname);
      exceptionSwitch(im0->exceptions, "l", "l =", "break;", 0, buf);
      sprintf(buf, "r = %s[r].%s",
        im1->values->plank->name, im1->values->fieldname);
      exceptionSwitch(im1->exceptions, "r", "r =", "break;", 0, buf);

      fprintf(outfile, "\t\treturn %s_%s_transition[l][r] + %d;\n",
        prefix,
        op->name,
        op->baseNum);
    }
    break;
  default:
    assert(0);
  }
}

static void
doPlankLabelMacrosSafely(op) Operator op;
{
  PlankMap im0;
  PlankMap im1;

  switch (op->arity) {
  case -1:
    fprintf(outfile, "#define %s_%s_state\t0\n", prefix, op->name);
    break;
  case 0:
    fprintf(outfile, "#define %s_%s_state", prefix, op->name);
    fprintf(outfile, "\t%d\n", op->table->transition[0]->newNum+1);
    break;
  case 1:
    fprintf(outfile, "#define %s_%s_state(l)", prefix, op->name);
    im0 = op->table->dimen[0]->pmap;
    if (im0) {
      if (im0->exceptions) {
        List es = im0->exceptions;
        assert(0);
        fprintf(outfile, "\t\tswitch (l) {\n");
        for (; es; es = es->next) {
          Exception e = (Exception) es->x;
          fprintf(outfile, "\t\tcase %d: return %d;\n", e->index, e->value ? e->value+im0->offset : 0);
        }
        fprintf(outfile, "\t\t}\n");
      }
      if (speedflag) {
        fprintf(outfile, "\t( %s[l].%s + %d )\n",
          im0->values->plank->name, im0->values->fieldname,
          im0->offset);
      } else {
        fprintf(outfile, "\t( (%s_TEMP = %s[l].%s) ? %s_TEMP + %d : 0 )\n",
          prefix,
          im0->values->plank->name, im0->values->fieldname,
          prefix,
          im0->offset);
      }
    } else {
      Item_Set *ts = transLval(op->table, 1, 0);
      if (*ts) {
        fprintf(outfile, "\t%d\n", (*ts)->newNum+1);
      } else {
        fprintf(outfile, "\t%d\n", 0);
      }
    }
    break;
  case 2:
    fprintf(outfile, "#define %s_%s_state(l,r)", prefix, op->name);

    im0 = op->table->dimen[0]->pmap;
    im1 = op->table->dimen[1]->pmap;
    if (!im0 && !im1) {
      Item_Set *ts = transLval(op->table, 1, 1);
      assert(0);
      if (*ts) {
        fprintf(outfile, "\t\treturn %d;\n", (*ts)->newNum+1);
      } else {
        fprintf(outfile, "\t\treturn %d;\n", 0);
      }
    } else if (!im0) {
      assert(0);
      if (im1->exceptions) {
        List es = im1->exceptions;
        fprintf(outfile, "\t\tswitch (r) {\n");
        for (; es; es = es->next) {
          Exception e = (Exception) es->x;
          fprintf(outfile, "\t\tcase %d: return %d;\n", e->index, e->value ? e->value+im1->offset : 0);
        }
        fprintf(outfile, "\t\t}\n");
      }
      fprintf(outfile, "\t\tstate = %s[r].%s; offset = %d;\n",
        im1->values->plank->name, im1->values->fieldname, im1->offset);
      fprintf(outfile, "\t\tbreak;\n");
    } else if (!im1) {
      assert(0);
      if (im0->exceptions) {
        List es = im0->exceptions;
        fprintf(outfile, "\t\tswitch (l) {\n");
        for (; es; es = es->next) {
          Exception e = (Exception) es->x;
          fprintf(outfile, "\t\tcase %d: return %d;\n", e->index, e->value ? e->value+im0->offset : 0);
        }
        fprintf(outfile, "\t\t}\n");
      }
      fprintf(outfile, "\t\tstate = %s[l].%s; offset = %d;\n",
        im0->values->plank->name, im0->values->fieldname, im0->offset);
      fprintf(outfile, "\t\tbreak;\n");
    } else {
      assert(im0->offset == 0);
      assert(im1->offset == 0);
      /*
      sprintf(buf, "l = %s[l].%s",
        im0->values->plank->name, im0->values->fieldname);
      exceptionSwitch(im0->exceptions, "l", "l =", "break;", 0, buf);
      sprintf(buf, "r = %s[r].%s",
        im1->values->plank->name, im1->values->fieldname);
      exceptionSwitch(im1->exceptions, "r", "r =", "break;", 0, buf);

      fprintf(outfile, "\t\tstate = %s_%s_transition[l][r]; offset = %d;\n",
        prefix,
        op->name,
        op->baseNum);
      fprintf(outfile, "\t\tbreak;\n");
      */

      if (speedflag) {
        fprintf(outfile, "\t( %s_%s_transition[%s[l].%s][%s[r].%s] + %d)\n",
          prefix,
          op->name,
          im0->values->plank->name, im0->values->fieldname,
          im1->values->plank->name, im1->values->fieldname,
          op->baseNum);
      } else {
        fprintf(outfile, "\t( (%s_TEMP = %s_%s_transition[%s[l].%s][%s[r].%s]) ? ",
          prefix,
          prefix,
          op->name,
          im0->values->plank->name, im0->values->fieldname,
          im1->values->plank->name, im1->values->fieldname);
        fprintf(outfile, "%s_TEMP + %d : 0 )\n",
          prefix,
          op->baseNum);
      }
    }
    break;
  default:
    assert(0);
  }
}
static void
doPlankLabelSafely(op) Operator op;
{
  fprintf(outfile, "\tcase %d:\n", op->num);
  switch (op->arity) {
  case -1:
    fprintf(outfile, "\t\treturn 0;\n");
    break;
  case 0:
    fprintf(outfile, "\t\treturn %s_%s_state;\n", prefix, op->name);
    break;
  case 1:
    fprintf(outfile, "\t\treturn %s_%s_state(l);\n", prefix, op->name);
    break;
  case 2:
    fprintf(outfile, "\t\treturn %s_%s_state(l,r);\n", prefix, op->name);
    break;
  default:
    assert(0);
  }
}

static void
makePlankState()
{
  fprintf(outfile, "\n");
  fprintf(outfile, "int %s_TEMP;\n", prefix);
  foreachList((ListFn) doPlankLabelMacrosSafely, operators);
  fprintf(outfile, "\n");

  fprintf(outfile, "#ifdef __STDC__\n");
  switch (max_arity) {
  case -1:
    fprintf(stderr, "ERROR: no terminals in grammar.\n");
    exit(1);
  case 0:
    fprintf(outfile, "int %s_state(int op) {\n", prefix);
    fprintf(outfile, "#else\n");
    fprintf(outfile, "int %s_state(op) int op; {\n", prefix);
    break;
  case 1:
    fprintf(outfile, "int %s_state(int op, int l) {\n", prefix);
    fprintf(outfile, "#else\n");
    fprintf(outfile, "int %s_state(op, l) int op; int l; {\n", prefix);
    break;
  case 2:
    fprintf(outfile, "int %s_state(int op, int l, int r) {\n", prefix);
    fprintf(outfile, "#else\n");
    fprintf(outfile, "int %s_state(op, l, r) int op; int l; int r; {\n", prefix);
    break;
  default:
    assert(0);
  }
  fprintf(outfile, "#endif\n");

  fprintf(outfile, "\tregister int %s_TEMP;\n", prefix);

  fprintf(outfile, "#ifndef NDEBUG\n");

  fprintf(outfile, "\tswitch (op) {\n");
  opsOfArity(2);
  if (max_arity >= 2) {
    fprintf(outfile,
    "\t\t%s_assert(r >= 0 && r < %d, %s_PANIC(\"Bad state %%d passed to %s_state\\n\", r));\n",
        prefix, globalMap->count, prefix, prefix);
    fprintf(outfile, "\t\t/*FALLTHROUGH*/\n");
  }
  opsOfArity(1);
  if (max_arity > 1) {
    fprintf(outfile,
    "\t\t%s_assert(l >= 0 && l < %d, %s_PANIC(\"Bad state %%d passed to %s_state\\n\", l));\n",
        prefix, globalMap->count, prefix, prefix);
    fprintf(outfile, "\t\t/*FALLTHROUGH*/\n");
  }
  opsOfArity(0);
  fprintf(outfile, "\t\tbreak;\n");
  fprintf(outfile, "\t}\n");
  fprintf(outfile, "#endif\n");

  fprintf(outfile, "\tswitch (op) {\n");
  fprintf(outfile,"\tdefault: %s_PANIC(\"Unknown op %%d in %s_state\\n\", op); abort(); return 0;\n",
    prefix, prefix);
  foreachList((ListFn) doPlankLabelSafely, operators);
  fprintf(outfile, "\t}\n");

  fprintf(outfile, "}\n");
}

void
makePlanks()
{
  List planks;
  renumber();
  makePmaps();
  planks = assemblePlanks();
  purgePlanks(planks);
  inToEx();
  makePlankRule();
  makePlankState();
}