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/* Print in infix form a struct expression.

   Copyright (C) 1986, 1989, 1991, 2000 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "symtab.h"

#include "gdbtypes.h"

#include "expression.h"

#include "value.h"

#include "language.h"

#include "parser-defs.h"

#ifdef HAVE_CTYPE_H

#include <ctype.h>

#endif

/* Prototypes for local functions */

static void print_subexp (struct expression *, int *, struct ui_file *,

                          enum precedence);

void

print_expression (exp, stream)

     struct expression *exp;

     struct ui_file *stream;

{

  int pc = 0;

  print_subexp (exp, &pc, stream, PREC_NULL);

}

/* Print the subexpression of EXP that starts in position POS, on STREAM.

   PREC is the precedence of the surrounding operator;

   if the precedence of the main operator of this subexpression is less,

   parentheses are needed here.  */

static void

print_subexp (exp, pos, stream, prec)

     register struct expression *exp;

     register int *pos;

     struct ui_file *stream;

     enum precedence prec;

{

  register unsigned tem;

  register const struct op_print *op_print_tab;

  register int pc;

  unsigned nargs;

  register char *op_str;

  int assign_modify = 0;

  enum exp_opcode opcode;

  enum precedence myprec = PREC_NULL;

  /* Set to 1 for a right-associative operator.  */

  int assoc = 0;

  value_ptr val;

  char *tempstr = NULL;

  op_print_tab = exp->language_defn->la_op_print_tab;

  pc = (*pos)++;

  opcode = exp->elts[pc].opcode;

  switch (opcode)

    {

      /* Common ops */

    case OP_SCOPE:

      myprec = PREC_PREFIX;

      assoc = 0;

      fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);

      fputs_filtered ("::", stream);

      nargs = longest_to_int (exp->elts[pc + 2].longconst);

      (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);

      fputs_filtered (&exp->elts[pc + 3].string, stream);

      return;

    case OP_LONG:

      (*pos) += 3;

      value_print (value_from_longest (exp->elts[pc + 1].type,

                                       exp->elts[pc + 2].longconst),

                   stream, 0, Val_no_prettyprint);

      return;

    case OP_DOUBLE:

      (*pos) += 3;

      value_print (value_from_double (exp->elts[pc + 1].type,

                                      exp->elts[pc + 2].doubleconst),

                   stream, 0, Val_no_prettyprint);

      return;

    case OP_VAR_VALUE:

      {

        struct block *b;

        (*pos) += 3;

        b = exp->elts[pc + 1].block;

        if (b != NULL

            && BLOCK_FUNCTION (b) != NULL

            && SYMBOL_SOURCE_NAME (BLOCK_FUNCTION (b)) != NULL)

          {

            fputs_filtered (SYMBOL_SOURCE_NAME (BLOCK_FUNCTION (b)), stream);

            fputs_filtered ("::", stream);

          }

        fputs_filtered (SYMBOL_SOURCE_NAME (exp->elts[pc + 2].symbol), stream);

      }

      return;

    case OP_LAST:

      (*pos) += 2;

      fprintf_filtered (stream, "$%d",

                        longest_to_int (exp->elts[pc + 1].longconst));

      return;

    case OP_REGISTER:

      (*pos) += 2;

      fprintf_filtered (stream, "$%s",

              REGISTER_NAME (longest_to_int (exp->elts[pc + 1].longconst)));

      return;

    case OP_BOOL:

      (*pos) += 2;

      fprintf_filtered (stream, "%s",

                        longest_to_int (exp->elts[pc + 1].longconst)

                        ? "TRUE" : "FALSE");

      return;

    case OP_INTERNALVAR:

      (*pos) += 2;

      fprintf_filtered (stream, "$%s",

                        internalvar_name (exp->elts[pc + 1].internalvar));

      return;

    case OP_FUNCALL:

      (*pos) += 2;

      nargs = longest_to_int (exp->elts[pc + 1].longconst);

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered (" (", stream);

      for (tem = 0; tem < nargs; tem++)

        {

          if (tem != 0)

            fputs_filtered (", ", stream);

          print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

        }

      fputs_filtered (")", stream);

      return;

    case OP_NAME:

    case OP_EXPRSTRING:

      nargs = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);

      fputs_filtered (&exp->elts[pc + 2].string, stream);

      return;

    case OP_STRING:

      nargs = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);

      /* LA_PRINT_STRING will print using the current repeat count threshold.

         If necessary, we can temporarily set it to zero, or pass it as an

         additional parameter to LA_PRINT_STRING.  -fnf */

      LA_PRINT_STRING (stream, &exp->elts[pc + 2].string, nargs, 1, 0);

      return;

    case OP_BITSTRING:

      nargs = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos)

        += 3 + BYTES_TO_EXP_ELEM ((nargs + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT);

      fprintf_unfiltered (stream, "B'<unimplemented>'");

      return;

    case OP_ARRAY:

      (*pos) += 3;

      nargs = longest_to_int (exp->elts[pc + 2].longconst);

      nargs -= longest_to_int (exp->elts[pc + 1].longconst);

      nargs++;

      tem = 0;

      if (exp->elts[pc + 4].opcode == OP_LONG

          && exp->elts[pc + 5].type == builtin_type_char

          && exp->language_defn->la_language == language_c)

        {

          /* Attempt to print C character arrays using string syntax.

             Walk through the args, picking up one character from each

             of the OP_LONG expression elements.  If any array element

             does not match our expection of what we should find for

             a simple string, revert back to array printing.  Note that

             the last expression element is an explicit null terminator

             byte, which doesn't get printed. */

          tempstr = alloca (nargs);

          pc += 4;

          while (tem < nargs)

            {

              if (exp->elts[pc].opcode != OP_LONG

                  || exp->elts[pc + 1].type != builtin_type_char)

                {

                  /* Not a simple array of char, use regular array printing. */

                  tem = 0;

                  break;

                }

              else

                {

                  tempstr[tem++] =

                    longest_to_int (exp->elts[pc + 2].longconst);

                  pc += 4;

                }

            }

        }

      if (tem > 0)

        {

          LA_PRINT_STRING (stream, tempstr, nargs - 1, 1, 0);

          (*pos) = pc;

        }

      else

        {

          int is_chill = exp->language_defn->la_language == language_chill;

          fputs_filtered (is_chill ? " [" : " {", stream);

          for (tem = 0; tem < nargs; tem++)

            {

              if (tem != 0)

                {

                  fputs_filtered (", ", stream);

                }

              print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

            }

          fputs_filtered (is_chill ? "]" : "}", stream);

        }

      return;

    case OP_LABELED:

      tem = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);

      if (exp->language_defn->la_language == language_chill)

        {

          fputs_filtered (".", stream);

          fputs_filtered (&exp->elts[pc + 2].string, stream);

          fputs_filtered (exp->elts[*pos].opcode == OP_LABELED ? ", "

                          : ": ",

                          stream);

        }

      else

        {

          /* Gcc support both these syntaxes.  Unsure which is preferred.  */

#if 1

          fputs_filtered (&exp->elts[pc + 2].string, stream);

          fputs_filtered (": ", stream);

#else

          fputs_filtered (".", stream);

          fputs_filtered (&exp->elts[pc + 2].string, stream);

          fputs_filtered ("=", stream);

#endif

        }

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      return;

    case TERNOP_COND:

      if ((int) prec > (int) PREC_COMMA)

        fputs_filtered ("(", stream);

      /* Print the subexpressions, forcing parentheses

         around any binary operations within them.

         This is more parentheses than are strictly necessary,

         but it looks clearer.  */

      print_subexp (exp, pos, stream, PREC_HYPER);

      fputs_filtered (" ? ", stream);

      print_subexp (exp, pos, stream, PREC_HYPER);

      fputs_filtered (" : ", stream);

      print_subexp (exp, pos, stream, PREC_HYPER);

      if ((int) prec > (int) PREC_COMMA)

        fputs_filtered (")", stream);

      return;

    case TERNOP_SLICE:

    case TERNOP_SLICE_COUNT:

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered ("(", stream);

      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

      fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);

      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

      fputs_filtered (")", stream);

      return;

    case STRUCTOP_STRUCT:

      tem = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered (".", stream);

      fputs_filtered (&exp->elts[pc + 2].string, stream);

      return;

      /* Will not occur for Modula-2 */

    case STRUCTOP_PTR:

      tem = longest_to_int (exp->elts[pc + 1].longconst);

      (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered ("->", stream);

      fputs_filtered (&exp->elts[pc + 2].string, stream);

      return;

    case BINOP_SUBSCRIPT:

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered ("[", stream);

      print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

      fputs_filtered ("]", stream);

      return;

    case UNOP_POSTINCREMENT:

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered ("++", stream);

      return;

    case UNOP_POSTDECREMENT:

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fputs_filtered ("--", stream);

      return;

    case UNOP_CAST:

      (*pos) += 2;

      if ((int) prec > (int) PREC_PREFIX)

        fputs_filtered ("(", stream);

      fputs_filtered ("(", stream);

      type_print (exp->elts[pc + 1].type, "", stream, 0);

      fputs_filtered (") ", stream);

      print_subexp (exp, pos, stream, PREC_PREFIX);

      if ((int) prec > (int) PREC_PREFIX)

        fputs_filtered (")", stream);

      return;

    case UNOP_MEMVAL:

      (*pos) += 2;

      if ((int) prec > (int) PREC_PREFIX)

        fputs_filtered ("(", stream);

      if (exp->elts[pc + 1].type->code == TYPE_CODE_FUNC &&

          exp->elts[pc + 3].opcode == OP_LONG)

        {

          /* We have a minimal symbol fn, probably.  It's encoded

             as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).

             Swallow the OP_LONG (including both its opcodes); ignore

             its type; print the value in the type of the MEMVAL.  */

          (*pos) += 4;

          val = value_at_lazy (exp->elts[pc + 1].type,

                               (CORE_ADDR) exp->elts[pc + 5].longconst,

                               NULL);

          value_print (val, stream, 0, Val_no_prettyprint);

        }

      else

        {

          fputs_filtered ("{", stream);

          type_print (exp->elts[pc + 1].type, "", stream, 0);

          fputs_filtered ("} ", stream);

          print_subexp (exp, pos, stream, PREC_PREFIX);

        }

      if ((int) prec > (int) PREC_PREFIX)

        fputs_filtered (")", stream);

      return;

    case BINOP_ASSIGN_MODIFY:

      opcode = exp->elts[pc + 1].opcode;

      (*pos) += 2;

      myprec = PREC_ASSIGN;

      assoc = 1;

      assign_modify = 1;

      op_str = "???";

      for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)

        if (op_print_tab[tem].opcode == opcode)

          {

            op_str = op_print_tab[tem].string;

            break;

          }

      if (op_print_tab[tem].opcode != opcode)

        /* Not found; don't try to keep going because we don't know how

           to interpret further elements.  */

        error ("Invalid expression");

      break;

      /* C++ ops */

    case OP_THIS:

      ++(*pos);

      fputs_filtered ("this", stream);

      return;

      /* Modula-2 ops */

    case MULTI_SUBSCRIPT:

      (*pos) += 2;

      nargs = longest_to_int (exp->elts[pc + 1].longconst);

      print_subexp (exp, pos, stream, PREC_SUFFIX);

      fprintf_unfiltered (stream, " [");

      for (tem = 0; tem < nargs; tem++)

        {

          if (tem != 0)

            fprintf_unfiltered (stream, ", ");

          print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);

        }

      fprintf_unfiltered (stream, "]");

      return;

    case BINOP_VAL:

      (*pos) += 2;

      fprintf_unfiltered (stream, "VAL(");

      type_print (exp->elts[pc + 1].type, "", stream, 0);

      fprintf_unfiltered (stream, ",");

      print_subexp (exp, pos, stream, PREC_PREFIX);

      fprintf_unfiltered (stream, ")");

      return;

    case BINOP_INCL:

    case BINOP_EXCL:

      error ("print_subexp:  Not implemented.");

      /* Default ops */

    default:

      op_str = "???";

      for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)

        if (op_print_tab[tem].opcode == opcode)

          {

            op_str = op_print_tab[tem].string;

            myprec = op_print_tab[tem].precedence;

            assoc = op_print_tab[tem].right_assoc;

            break;

          }

      if (op_print_tab[tem].opcode != opcode)

        /* Not found; don't try to keep going because we don't know how

           to interpret further elements.  For example, this happens

           if opcode is OP_TYPE.  */

        error ("Invalid expression");

    }

  /* Note that PREC_BUILTIN will always emit parentheses. */

  if ((int) myprec < (int) prec)

    fputs_filtered ("(", stream);

  if ((int) opcode > (int) BINOP_END)

    {

      if (assoc)

        {

          /* Unary postfix operator.  */

          print_subexp (exp, pos, stream, PREC_SUFFIX);

          fputs_filtered (op_str, stream);

        }

      else

        {

          /* Unary prefix operator.  */

          fputs_filtered (op_str, stream);

          if (myprec == PREC_BUILTIN_FUNCTION)

            fputs_filtered ("(", stream);

          print_subexp (exp, pos, stream, PREC_PREFIX);

          if (myprec == PREC_BUILTIN_FUNCTION)

            fputs_filtered (")", stream);

        }

    }

  else

    {

      /* Binary operator.  */

      /* Print left operand.

         If operator is right-associative,

         increment precedence for this operand.  */

      print_subexp (exp, pos, stream,

                    (enum precedence) ((int) myprec + assoc));

      /* Print the operator itself.  */

      if (assign_modify)

        fprintf_filtered (stream, " %s= ", op_str);

      else if (op_str[0] == ',')

        fprintf_filtered (stream, "%s ", op_str);

      else

        fprintf_filtered (stream, " %s ", op_str);

      /* Print right operand.

         If operator is left-associative,

         increment precedence for this operand.  */

      print_subexp (exp, pos, stream,

                    (enum precedence) ((int) myprec + !assoc));

    }

  if ((int) myprec < (int) prec)

    fputs_filtered (")", stream);

}

/* Return the operator corresponding to opcode OP as

   a string.   NULL indicates that the opcode was not found in the

   current language table.  */

char *

op_string (op)

     enum exp_opcode op;

{

  int tem;

  register const struct op_print *op_print_tab;

  op_print_tab = current_language->la_op_print_tab;

  for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)

    if (op_print_tab[tem].opcode == op)

      return op_print_tab[tem].string;

  return NULL;

}

/* Support for dumping the raw data from expressions in a human readable

   form.  */

static char *op_name PARAMS ((int opcode));

static char *

op_name (opcode)

     int opcode;

{

  switch (opcode)

    {

    default:

      {

        static char buf[30];

        sprintf (buf, "<unknown %d>", opcode);

        return buf;

      }

    case OP_NULL:

      return "OP_NULL";

    case BINOP_ADD:

      return "BINOP_ADD";

    case BINOP_SUB:

      return "BINOP_SUB";

    case BINOP_MUL:

      return "BINOP_MUL";

    case BINOP_DIV:

      return "BINOP_DIV";

    case BINOP_REM:

      return "BINOP_REM";

    case BINOP_MOD:

      return "BINOP_MOD";

    case BINOP_LSH:

      return "BINOP_LSH";

    case BINOP_RSH:

      return "BINOP_RSH";

    case BINOP_LOGICAL_AND:

      return "BINOP_LOGICAL_AND";

    case BINOP_LOGICAL_OR:

      return "BINOP_LOGICAL_OR";

    case BINOP_BITWISE_AND:

      return "BINOP_BITWISE_AND";

    case BINOP_BITWISE_IOR:

      return "BINOP_BITWISE_IOR";

    case BINOP_BITWISE_XOR:

      return "BINOP_BITWISE_XOR";

    case BINOP_EQUAL:

      return "BINOP_EQUAL";

    case BINOP_NOTEQUAL:

      return "BINOP_NOTEQUAL";

    case BINOP_LESS:

      return "BINOP_LESS";

    case BINOP_GTR:

      return "BINOP_GTR";

    case BINOP_LEQ:

      return "BINOP_LEQ";

    case BINOP_GEQ:

      return "BINOP_GEQ";

    case BINOP_REPEAT:

      return "BINOP_REPEAT";

    case BINOP_ASSIGN:

      return "BINOP_ASSIGN";

    case BINOP_COMMA:

      return "BINOP_COMMA";

    case BINOP_SUBSCRIPT:

      return "BINOP_SUBSCRIPT";

    case MULTI_SUBSCRIPT:

      return "MULTI_SUBSCRIPT";

    case BINOP_EXP:

      return "BINOP_EXP";

    case BINOP_MIN:

      return "BINOP_MIN";

    case BINOP_MAX:

      return "BINOP_MAX";

    case STRUCTOP_MEMBER:

      return "STRUCTOP_MEMBER";

    case STRUCTOP_MPTR:

      return "STRUCTOP_MPTR";

    case BINOP_INTDIV:

      return "BINOP_INTDIV";

    case BINOP_ASSIGN_MODIFY:

      return "BINOP_ASSIGN_MODIFY";

    case BINOP_VAL:

      return "BINOP_VAL";

    case BINOP_INCL:

      return "BINOP_INCL";

    case BINOP_EXCL:

      return "BINOP_EXCL";

    case BINOP_CONCAT:

      return "BINOP_CONCAT";

    case BINOP_RANGE:

      return "BINOP_RANGE";

    case BINOP_END:

      return "BINOP_END";

    case TERNOP_COND:

      return "TERNOP_COND";

    case TERNOP_SLICE:

      return "TERNOP_SLICE";

    case TERNOP_SLICE_COUNT:

      return "TERNOP_SLICE_COUNT";

    case OP_LONG:

      return "OP_LONG";

    case OP_DOUBLE:

      return "OP_DOUBLE";

    case OP_VAR_VALUE:

      return "OP_VAR_VALUE";

    case OP_LAST:

      return "OP_LAST";

    case OP_REGISTER:

      return "OP_REGISTER";

    case OP_INTERNALVAR:

      return "OP_INTERNALVAR";

    case OP_FUNCALL:

      return "OP_FUNCALL";

    case OP_STRING:

      return "OP_STRING";

    case OP_BITSTRING:

      return "OP_BITSTRING";

    case OP_ARRAY:

      return "OP_ARRAY";

    case UNOP_CAST:

      return "UNOP_CAST";

    case UNOP_MEMVAL:

      return "UNOP_MEMVAL";

    case UNOP_NEG:

      return "UNOP_NEG";

    case UNOP_LOGICAL_NOT:

      return "UNOP_LOGICAL_NOT";

    case UNOP_COMPLEMENT:

      return "UNOP_COMPLEMENT";