gdb/expprint.c - gdb

Functions defined

Macros defined

Source code

  1. /* Print in infix form a struct expression.

  3.    Copyright (C) 1986-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.

  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.

  17.    You should have received a copy of the GNU General Public License
  18.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  20. #include "defs.h"
  21. #include "symtab.h"
  22. #include "gdbtypes.h"
  23. #include "expression.h"
  24. #include "value.h"
  25. #include "language.h"
  26. #include "parser-defs.h"
  27. #include "user-regs.h"                /* For user_reg_map_regnum_to_name.  */
  28. #include "target.h"
  29. #include "block.h"
  30. #include "objfiles.h"
  31. #include "valprint.h"

  33. #include <ctype.h>

  35. void
  36. ‌print_expression (struct expression *exp, struct ui_file *stream)
  37. {
  38.   int pc = 0;

  40.   print_subexp (exp, &pc, stream, PREC_NULL);
  41. }

  43. /* Print the subexpression of EXP that starts in position POS, on STREAM.
  44.    PREC is the precedence of the surrounding operator;
  45.    if the precedence of the main operator of this subexpression is less,
  46.    parentheses are needed here.  */

  48. void
  49. ‌print_subexp (struct expression *exp, int *pos,
  50.               struct ui_file *stream, enum precedence prec)
  51. {
  52.   exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
  53. }

  55. /* Standard implementation of print_subexp for use in language_defn
  56.    vectors.  */
  57. void
  58. ‌print_subexp_standard (struct expression *exp, int *pos,
  59.                        struct ui_file *stream, enum precedence prec)
  60. {
  61.   unsigned tem;
  62.   const struct op_print *op_print_tab;
  63.   int pc;
  64.   unsigned nargs;
  65.   char *op_str;
  66.   int assign_modify = 0;
  67.   enum exp_opcode opcode;
  68.   enum precedence myprec = PREC_NULL;
  69.   /* Set to 1 for a right-associative operator.  */
  70.   int assoc = 0;
  71.   struct value *val;
  72.   char *tempstr = NULL;

  74.   op_print_tab = exp->language_defn->la_op_print_tab;
  75.   pc = (*pos)++;
  76.   opcode = exp->elts[pc].opcode;
  77.   switch (opcode)
  78.     {
  79.       /* Common ops */

  81.     case OP_TYPE:
  82.       (*pos) += 2;
  83.       type_print (exp->elts[pc + 1].type, "", stream, 0);
  84.       return;

  86.     case OP_SCOPE:
  87.       myprec = PREC_PREFIX;
  88.       assoc = 0;
  89.       fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
  90.       fputs_filtered ("::", stream);
  91.       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  92.       (*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
  93.       fputs_filtered (&exp->elts[pc + 3].string, stream);
  94.       return;

  96.     case OP_LONG:
  97.       {
  98.         struct value_print_options opts;

  100.         get_no_prettyformat_print_options (&opts);
  101.         (*pos) += 3;
  102.         value_print (value_from_longest (exp->elts[pc + 1].type,
  103.                                          exp->elts[pc + 2].longconst),
  104.                      stream, &opts);
  105.       }
  106.       return;

  108.     case OP_DOUBLE:
  109.       {
  110.         struct value_print_options opts;

  112.         get_no_prettyformat_print_options (&opts);
  113.         (*pos) += 3;
  114.         value_print (value_from_double (exp->elts[pc + 1].type,
  115.                                         exp->elts[pc + 2].doubleconst),
  116.                      stream, &opts);
  117.       }
  118.       return;

  120.     case OP_VAR_VALUE:
  121.       {
  122.         const struct block *b;

  124.         (*pos) += 3;
  125.         b = exp->elts[pc + 1].block;
  126.         if (b != NULL
  127.             && BLOCK_FUNCTION (b) != NULL
  128.             && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
  129.           {
  130.             fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
  131.             fputs_filtered ("::", stream);
  132.           }
  133.         fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
  134.       }
  135.       return;

  137.     case OP_VAR_ENTRY_VALUE:
  138.       {
  139.         (*pos) += 2;
  140.         fprintf_filtered (stream, "%s@entry",
  141.                           SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
  142.       }
  143.       return;

  145.     case OP_LAST:
  146.       (*pos) += 2;
  147.       fprintf_filtered (stream, "$%d",
  148.                         longest_to_int (exp->elts[pc + 1].longconst));
  149.       return;

  151.     case OP_REGISTER:
  152.       {
  153.         const char *name = &exp->elts[pc + 2].string;

  155.         (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
  156.         fprintf_filtered (stream, "$%s", name);
  157.         return;
  158.       }

  160.     case OP_BOOL:
  161.       (*pos) += 2;
  162.       fprintf_filtered (stream, "%s",
  163.                         longest_to_int (exp->elts[pc + 1].longconst)
  164.                         ? "TRUE" : "FALSE");
  165.       return;

  167.     case OP_INTERNALVAR:
  168.       (*pos) += 2;
  169.       fprintf_filtered (stream, "$%s",
  170.                         internalvar_name (exp->elts[pc + 1].internalvar));
  171.       return;

  173.     case OP_FUNCALL:
  174.       (*pos) += 2;
  175.       nargs = longest_to_int (exp->elts[pc + 1].longconst);
  176.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  177.       fputs_filtered (" (", stream);
  178.       for (tem = 0; tem < nargs; tem++)
  179.         {
  180.           if (tem != 0)
  181.             fputs_filtered (", ", stream);
  182.           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  183.         }
  184.       fputs_filtered (")", stream);
  185.       return;

  187.     case OP_NAME:
  188.       nargs = longest_to_int (exp->elts[pc + 1].longconst);
  189.       (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
  190.       fputs_filtered (&exp->elts[pc + 2].string, stream);
  191.       return;

  193.     case OP_STRING:
  194.       {
  195.         struct value_print_options opts;

  197.         nargs = longest_to_int (exp->elts[pc + 1].longconst);
  198.         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
  199.         /* LA_PRINT_STRING will print using the current repeat count threshold.
  200.            If necessary, we can temporarily set it to zero, or pass it as an
  201.            additional parameter to LA_PRINT_STRING.  -fnf */
  202.         get_user_print_options (&opts);
  203.         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
  204.                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
  205.                          NULL, 0, &opts);
  206.       }
  207.       return;

  209.     case OP_OBJC_NSSTRING:        /* Objective-C Foundation Class
  210.                                    NSString constant.  */
  211.       {
  212.         struct value_print_options opts;

  214.         nargs = longest_to_int (exp->elts[pc + 1].longconst);
  215.         (*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
  216.         fputs_filtered ("@\"", stream);
  217.         get_user_print_options (&opts);
  218.         LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
  219.                          (gdb_byte *) &exp->elts[pc + 2].string, nargs,
  220.                          NULL, 0, &opts);
  221.         fputs_filtered ("\"", stream);
  222.       }
  223.       return;

  225.     case OP_OBJC_MSGCALL:
  226.       {                        /* Objective C message (method) call.  */
  227.         char *selector;

  229.         (*pos) += 3;
  230.         nargs = longest_to_int (exp->elts[pc + 2].longconst);
  231.         fprintf_unfiltered (stream, "[");
  232.         print_subexp (exp, pos, stream, PREC_SUFFIX);
  233.         if (0 == target_read_string (exp->elts[pc + 1].longconst,
  234.                                      &selector, 1024, NULL))
  235.           {
  236.             error (_("bad selector"));
  237.             return;
  238.           }
  239.         if (nargs)
  240.           {
  241.             char *s, *nextS;

  243.             s = alloca (strlen (selector) + 1);
  244.             strcpy (s, selector);
  245.             for (tem = 0; tem < nargs; tem++)
  246.               {
  247.                 nextS = strchr (s, ':');
  248.                 gdb_assert (nextS);        /* Make sure we found ':'.  */
  249.                 *nextS = '\0';
  250.                 fprintf_unfiltered (stream, " %s: ", s);
  251.                 s = nextS + 1;
  252.                 print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  253.               }
  254.           }
  255.         else
  256.           {
  257.             fprintf_unfiltered (stream, " %s", selector);
  258.           }
  259.         fprintf_unfiltered (stream, "]");
  260.         /* "selector" was malloc'd by target_read_string.  Free it.  */
  261.         xfree (selector);
  262.         return;
  263.       }

  265.     case OP_ARRAY:
  266.       (*pos) += 3;
  267.       nargs = longest_to_int (exp->elts[pc + 2].longconst);
  268.       nargs -= longest_to_int (exp->elts[pc + 1].longconst);
  269.       nargs++;
  270.       tem = 0;
  271.       if (exp->elts[pc + 4].opcode == OP_LONG
  272.           && exp->elts[pc + 5].type
  273.              == builtin_type (exp->gdbarch)->builtin_char
  274.           && exp->language_defn->la_language == language_c)
  275.         {
  276.           /* Attempt to print C character arrays using string syntax.
  277.              Walk through the args, picking up one character from each
  278.              of the OP_LONG expression elements.  If any array element
  279.              does not match our expection of what we should find for
  280.              a simple string, revert back to array printing.  Note that
  281.              the last expression element is an explicit null terminator
  282.              byte, which doesn't get printed.  */
  283.           tempstr = alloca (nargs);
  284.           pc += 4;
  285.           while (tem < nargs)
  286.             {
  287.               if (exp->elts[pc].opcode != OP_LONG
  288.                   || exp->elts[pc + 1].type
  289.                      != builtin_type (exp->gdbarch)->builtin_char)
  290.                 {
  291.                   /* Not a simple array of char, use regular array
  292.                      printing.  */
  293.                   tem = 0;
  294.                   break;
  295.                 }
  296.               else
  297.                 {
  298.                   tempstr[tem++] =
  299.                     longest_to_int (exp->elts[pc + 2].longconst);
  300.                   pc += 4;
  301.                 }
  302.             }
  303.         }
  304.       if (tem > 0)
  305.         {
  306.           struct value_print_options opts;

  308.           get_user_print_options (&opts);
  309.           LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
  310.                            (gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
  311.           (*pos) = pc;
  312.         }
  313.       else
  314.         {
  315.           fputs_filtered (" {", stream);
  316.           for (tem = 0; tem < nargs; tem++)
  317.             {
  318.               if (tem != 0)
  319.                 {
  320.                   fputs_filtered (", ", stream);
  321.                 }
  322.               print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  323.             }
  324.           fputs_filtered ("}", stream);
  325.         }
  326.       return;

  328.     case TERNOP_COND:
  329.       if ((int) prec > (int) PREC_COMMA)
  330.         fputs_filtered ("(", stream);
  331.       /* Print the subexpressions, forcing parentheses
  332.          around any binary operations within them.
  333.          This is more parentheses than are strictly necessary,
  334.          but it looks clearer.  */
  335.       print_subexp (exp, pos, stream, PREC_HYPER);
  336.       fputs_filtered (" ? ", stream);
  337.       print_subexp (exp, pos, stream, PREC_HYPER);
  338.       fputs_filtered (" : ", stream);
  339.       print_subexp (exp, pos, stream, PREC_HYPER);
  340.       if ((int) prec > (int) PREC_COMMA)
  341.         fputs_filtered (")", stream);
  342.       return;

  344.     case TERNOP_SLICE:
  345.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  346.       fputs_filtered ("(", stream);
  347.       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  348.       fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
  349.       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  350.       fputs_filtered (")", stream);
  351.       return;

  353.     case STRUCTOP_STRUCT:
  354.       tem = longest_to_int (exp->elts[pc + 1].longconst);
  355.       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
  356.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  357.       fputs_filtered (".", stream);
  358.       fputs_filtered (&exp->elts[pc + 2].string, stream);
  359.       return;

  361.       /* Will not occur for Modula-2.  */
  362.     case STRUCTOP_PTR:
  363.       tem = longest_to_int (exp->elts[pc + 1].longconst);
  364.       (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
  365.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  366.       fputs_filtered ("->", stream);
  367.       fputs_filtered (&exp->elts[pc + 2].string, stream);
  368.       return;

  370.     case STRUCTOP_MEMBER:
  371.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  372.       fputs_filtered (".*", stream);
  373.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  374.       return;

  376.     case STRUCTOP_MPTR:
  377.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  378.       fputs_filtered ("->*", stream);
  379.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  380.       return;

  382.     case BINOP_SUBSCRIPT:
  383.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  384.       fputs_filtered ("[", stream);
  385.       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  386.       fputs_filtered ("]", stream);
  387.       return;

  389.     case UNOP_POSTINCREMENT:
  390.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  391.       fputs_filtered ("++", stream);
  392.       return;

  394.     case UNOP_POSTDECREMENT:
  395.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  396.       fputs_filtered ("--", stream);
  397.       return;

  399.     case UNOP_CAST:
  400.       (*pos) += 2;
  401.       if ((int) prec > (int) PREC_PREFIX)
  402.         fputs_filtered ("(", stream);
  403.       fputs_filtered ("(", stream);
  404.       type_print (exp->elts[pc + 1].type, "", stream, 0);
  405.       fputs_filtered (") ", stream);
  406.       print_subexp (exp, pos, stream, PREC_PREFIX);
  407.       if ((int) prec > (int) PREC_PREFIX)
  408.         fputs_filtered (")", stream);
  409.       return;

  411.     case UNOP_CAST_TYPE:
  412.       if ((int) prec > (int) PREC_PREFIX)
  413.         fputs_filtered ("(", stream);
  414.       fputs_filtered ("(", stream);
  415.       print_subexp (exp, pos, stream, PREC_PREFIX);
  416.       fputs_filtered (") ", stream);
  417.       print_subexp (exp, pos, stream, PREC_PREFIX);
  418.       if ((int) prec > (int) PREC_PREFIX)
  419.         fputs_filtered (")", stream);
  420.       return;

  422.     case UNOP_DYNAMIC_CAST:
  423.     case UNOP_REINTERPRET_CAST:
  424.       fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
  425.                       : "reinterpret_cast", stream);
  426.       fputs_filtered ("<", stream);
  427.       print_subexp (exp, pos, stream, PREC_PREFIX);
  428.       fputs_filtered ("> (", stream);
  429.       print_subexp (exp, pos, stream, PREC_PREFIX);
  430.       fputs_filtered (")", stream);
  431.       return;

  433.     case UNOP_MEMVAL:
  434.       (*pos) += 2;
  435.       if ((int) prec > (int) PREC_PREFIX)
  436.         fputs_filtered ("(", stream);
  437.       if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
  438.           && exp->elts[pc + 3].opcode == OP_LONG)
  439.         {
  440.           struct value_print_options opts;

  442.           /* We have a minimal symbol fn, probably.  It's encoded
  443.              as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
  444.              Swallow the OP_LONG (including both its opcodes); ignore
  445.              its type; print the value in the type of the MEMVAL.  */
  446.           (*pos) += 4;
  447.           val = value_at_lazy (exp->elts[pc + 1].type,
  448.                                (CORE_ADDR) exp->elts[pc + 5].longconst);
  449.           get_no_prettyformat_print_options (&opts);
  450.           value_print (val, stream, &opts);
  451.         }
  452.       else
  453.         {
  454.           fputs_filtered ("{", stream);
  455.           type_print (exp->elts[pc + 1].type, "", stream, 0);
  456.           fputs_filtered ("} ", stream);
  457.           print_subexp (exp, pos, stream, PREC_PREFIX);
  458.         }
  459.       if ((int) prec > (int) PREC_PREFIX)
  460.         fputs_filtered (")", stream);
  461.       return;

  463.     case UNOP_MEMVAL_TYPE:
  464.       if ((int) prec > (int) PREC_PREFIX)
  465.         fputs_filtered ("(", stream);
  466.       fputs_filtered ("{", stream);
  467.       print_subexp (exp, pos, stream, PREC_PREFIX);
  468.       fputs_filtered ("} ", stream);
  469.       print_subexp (exp, pos, stream, PREC_PREFIX);
  470.       if ((int) prec > (int) PREC_PREFIX)
  471.         fputs_filtered (")", stream);
  472.       return;

  474.     case UNOP_MEMVAL_TLS:
  475.       (*pos) += 3;
  476.       if ((int) prec > (int) PREC_PREFIX)
  477.         fputs_filtered ("(", stream);
  478.       fputs_filtered ("{", stream);
  479.       type_print (exp->elts[pc + 2].type, "", stream, 0);
  480.       fputs_filtered ("} ", stream);
  481.       print_subexp (exp, pos, stream, PREC_PREFIX);
  482.       if ((int) prec > (int) PREC_PREFIX)
  483.         fputs_filtered (")", stream);
  484.       return;

  486.     case BINOP_ASSIGN_MODIFY:
  487.       opcode = exp->elts[pc + 1].opcode;
  488.       (*pos) += 2;
  489.       myprec = PREC_ASSIGN;
  490.       assoc = 1;
  491.       assign_modify = 1;
  492.       op_str = "???";
  493.       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
  494.         if (op_print_tab[tem].opcode == opcode)
  495.           {
  496.             op_str = op_print_tab[tem].string;
  497.             break;
  498.           }
  499.       if (op_print_tab[tem].opcode != opcode)
  500.         /* Not found; don't try to keep going because we don't know how
  501.            to interpret further elements.  */
  502.         error (_("Invalid expression"));
  503.       break;

  505.       /* C++ ops */

  507.     case OP_THIS:
  508.       ++(*pos);
  509.       if (exp->language_defn->la_name_of_this)
  510.         fputs_filtered (exp->language_defn->la_name_of_this, stream);
  511.       else
  512.         fprintf_filtered (stream, _("<language %s has no 'this'>"),
  513.                           exp->language_defn->la_name);
  514.       return;

  516.       /* Modula-2 ops */

  518.     case MULTI_SUBSCRIPT:
  519.       (*pos) += 2;
  520.       nargs = longest_to_int (exp->elts[pc + 1].longconst);
  521.       print_subexp (exp, pos, stream, PREC_SUFFIX);
  522.       fprintf_unfiltered (stream, " [");
  523.       for (tem = 0; tem < nargs; tem++)
  524.         {
  525.           if (tem != 0)
  526.             fprintf_unfiltered (stream, ", ");
  527.           print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
  528.         }
  529.       fprintf_unfiltered (stream, "]");
  530.       return;

  532.     case BINOP_VAL:
  533.       (*pos) += 2;
  534.       fprintf_unfiltered (stream, "VAL(");
  535.       type_print (exp->elts[pc + 1].type, "", stream, 0);
  536.       fprintf_unfiltered (stream, ",");
  537.       print_subexp (exp, pos, stream, PREC_PREFIX);
  538.       fprintf_unfiltered (stream, ")");
  539.       return;

  541.     case TYPE_INSTANCE:
  542.       {
  543.         LONGEST count = exp->elts[pc + 1].longconst;

  545.         /* The COUNT.  */
  546.         (*pos)++;
  547.         fputs_unfiltered ("TypesInstance(", stream);
  548.         while (count-- > 0)
  549.           {
  550.             type_print (exp->elts[(*pos)++].type, "", stream, 0);
  551.             if (count > 0)
  552.               fputs_unfiltered (",", stream);
  553.           }
  554.         fputs_unfiltered (",", stream);
  555.         /* Ending COUNT and ending TYPE_INSTANCE.  */
  556.         (*pos) += 2;
  557.         print_subexp (exp, pos, stream, PREC_PREFIX);
  558.         fputs_unfiltered (")", stream);
  559.         return;
  560.       }

  562.       /* Default ops */

  564.     default:
  565.       op_str = "???";
  566.       for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
  567.         if (op_print_tab[tem].opcode == opcode)
  568.           {
  569.             op_str = op_print_tab[tem].string;
  570.             myprec = op_print_tab[tem].precedence;
  571.             assoc = op_print_tab[tem].right_assoc;
  572.             break;
  573.           }
  574.       if (op_print_tab[tem].opcode != opcode)
  575.         /* Not found; don't try to keep going because we don't know how
  576.            to interpret further elements.  For example, this happens
  577.            if opcode is OP_TYPE.  */
  578.         error (_("Invalid expression"));
  579.     }

  581.   /* Note that PREC_BUILTIN will always emit parentheses.  */
  582.   if ((int) myprec < (int) prec)
  583.     fputs_filtered ("(", stream);
  584.   if ((int) opcode > (int) BINOP_END)
  585.     {
  586.       if (assoc)
  587.         {
  588.           /* Unary postfix operator.  */
  589.           print_subexp (exp, pos, stream, PREC_SUFFIX);
  590.           fputs_filtered (op_str, stream);
  591.         }
  592.       else
  593.         {
  594.           /* Unary prefix operator.  */
  595.           fputs_filtered (op_str, stream);
  596.           if (myprec == PREC_BUILTIN_FUNCTION)
  597.             fputs_filtered ("(", stream);
  598.           print_subexp (exp, pos, stream, PREC_PREFIX);
  599.           if (myprec == PREC_BUILTIN_FUNCTION)
  600.             fputs_filtered (")", stream);
  601.         }
  602.     }
  603.   else
  604.     {
  605.       /* Binary operator.  */
  606.       /* Print left operand.
  607.          If operator is right-associative,
  608.          increment precedence for this operand.  */
  609.       print_subexp (exp, pos, stream,
  610.                     (enum precedence) ((int) myprec + assoc));
  611.       /* Print the operator itself.  */
  612.       if (assign_modify)
  613.         fprintf_filtered (stream, " %s= ", op_str);
  614.       else if (op_str[0] == ',')
  615.         fprintf_filtered (stream, "%s ", op_str);
  616.       else
  617.         fprintf_filtered (stream, " %s ", op_str);
  618.       /* Print right operand.
  619.          If operator is left-associative,
  620.          increment precedence for this operand.  */
  621.       print_subexp (exp, pos, stream,
  622.                     (enum precedence) ((int) myprec + !assoc));
  623.     }

  625.   if ((int) myprec < (int) prec)
  626.     fputs_filtered (")", stream);
  627. }

  629. /* Return the operator corresponding to opcode OP as
  630.    a string.   NULL indicates that the opcode was not found in the
  631.    current language table.  */
  632. char *
  633. ‌op_string (enum exp_opcode op)
  634. {
  635.   int tem;
  636.   const struct op_print *op_print_tab;

  638.   op_print_tab = current_language->la_op_print_tab;
  639.   for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
  640.     if (op_print_tab[tem].opcode == op)
  641.       return op_print_tab[tem].string;
  642.   return NULL;
  643. }

  645. /* Support for dumping the raw data from expressions in a human readable
  646.    form.  */

  648. static int dump_subexp_body (struct expression *exp, struct ui_file *, int);

  650. /* Name for OPCODE, when it appears in expression EXP.  */

  652. char *
  653. ‌op_name (struct expression *exp, enum exp_opcode opcode)
  654. {
  655.   return exp->language_defn->la_exp_desc->op_name (opcode);
  656. }

  658. /* Default name for the standard operator OPCODE (i.e., one defined in
  659.    the definition of enum exp_opcode).  */

  661. char *
  662. ‌op_name_standard (enum exp_opcode opcode)
  663. {
  664.   switch (opcode)
  665.     {
  666.     default:
  667.       {
  668.         static char buf[30];

  670.         xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
  671.         return buf;
  672.       }
  673. ‌#define OP(name)        \
  674.     case name:                \
  675.       return #name ;
  676. #include "std-operator.def"
  677. ‌#undef OP
  678.     }
  679. }

  681. /* Print a raw dump of expression EXP to STREAM.
  682.    NOTE, if non-NULL, is printed as extra explanatory text.  */

  684. void
  685. ‌dump_raw_expression (struct expression *exp, struct ui_file *stream,
  686.                      char *note)
  687. {
  688.   int elt;
  689.   char *opcode_name;
  690.   char *eltscan;
  691.   int eltsize;

  693.   fprintf_filtered (stream, "Dump of expression @ ");
  694.   gdb_print_host_address (exp, stream);
  695.   if (note)
  696.     fprintf_filtered (stream, ", %s:", note);
  697.   fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
  698.                     exp->language_defn->la_name, exp->nelts,
  699.                     (long) sizeof (union exp_element));
  700.   fprintf_filtered (stream, "\t%5s  %20s  %16s  %s\n", "Index", "Opcode",
  701.                     "Hex Value", "String Value");
  702.   for (elt = 0; elt < exp->nelts; elt++)
  703.     {
  704.       fprintf_filtered (stream, "\t%5d  ", elt);
  705.       opcode_name = op_name (exp, exp->elts[elt].opcode);

  707.       fprintf_filtered (stream, "%20s  ", opcode_name);
  708.       print_longest (stream, 'd', 0, exp->elts[elt].longconst);
  709.       fprintf_filtered (stream, "  ");

  711.       for (eltscan = (char *) &exp->elts[elt],
  712.            eltsize = sizeof (union exp_element);
  713.            eltsize-- > 0;
  714.            eltscan++)
  715.         {
  716.           fprintf_filtered (stream, "%c",
  717.                             isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
  718.         }
  719.       fprintf_filtered (stream, "\n");
  720.     }
  721. }

  723. /* Dump the subexpression of prefix expression EXP whose operator is at
  724.    position ELT onto STREAM.  Returns the position of the next
  725.    subexpression in EXP.  */

  727. int
  728. ‌dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
  729. {
  730.   static int indent = 0;
  731.   int i;

  733.   fprintf_filtered (stream, "\n");
  734.   fprintf_filtered (stream, "\t%5d  ", elt);

  736.   for (i = 1; i <= indent; i++)
  737.     fprintf_filtered (stream, " ");
  738.   indent += 2;

  740.   fprintf_filtered (stream, "%-20s  ", op_name (exp, exp->elts[elt].opcode));

  742.   elt = dump_subexp_body (exp, stream, elt);

  744.   indent -= 2;

  746.   return elt;
  747. }

  749. /* Dump the operands of prefix expression EXP whose opcode is at
  750.    position ELT onto STREAM.  Returns the position of the next
  751.    subexpression in EXP.  */

  753. static int
  754. ‌dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
  755. {
  756.   return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
  757. }

  759. /* Default value for subexp_body in exp_descriptor vector.  */

  761. int
  762. ‌dump_subexp_body_standard (struct expression *exp,
  763.                            struct ui_file *stream, int elt)
  764. {
  765.   int opcode = exp->elts[elt++].opcode;

  767.   switch (opcode)
  768.     {
  769.     case TERNOP_COND:
  770.     case TERNOP_SLICE:
  771.       elt = dump_subexp (exp, stream, elt);
  772.       /* FALL THROUGH */
  773.     case BINOP_ADD:
  774.     case BINOP_SUB:
  775.     case BINOP_MUL:
  776.     case BINOP_DIV:
  777.     case BINOP_REM:
  778.     case BINOP_MOD:
  779.     case BINOP_LSH:
  780.     case BINOP_RSH:
  781.     case BINOP_LOGICAL_AND:
  782.     case BINOP_LOGICAL_OR:
  783.     case BINOP_BITWISE_AND:
  784.     case BINOP_BITWISE_IOR:
  785.     case BINOP_BITWISE_XOR:
  786.     case BINOP_EQUAL:
  787.     case BINOP_NOTEQUAL:
  788.     case BINOP_LESS:
  789.     case BINOP_GTR:
  790.     case BINOP_LEQ:
  791.     case BINOP_GEQ:
  792.     case BINOP_REPEAT:
  793.     case BINOP_ASSIGN:
  794.     case BINOP_COMMA:
  795.     case BINOP_SUBSCRIPT:
  796.     case BINOP_EXP:
  797.     case BINOP_MIN:
  798.     case BINOP_MAX:
  799.     case BINOP_INTDIV:
  800.     case BINOP_ASSIGN_MODIFY:
  801.     case BINOP_VAL:
  802.     case BINOP_CONCAT:
  803.     case BINOP_END:
  804.     case STRUCTOP_MEMBER:
  805.     case STRUCTOP_MPTR:
  806.       elt = dump_subexp (exp, stream, elt);
  807.       /* FALL THROUGH */
  808.     case UNOP_NEG:
  809.     case UNOP_LOGICAL_NOT:
  810.     case UNOP_COMPLEMENT:
  811.     case UNOP_IND:
  812.     case UNOP_ADDR:
  813.     case UNOP_PREINCREMENT:
  814.     case UNOP_POSTINCREMENT:
  815.     case UNOP_PREDECREMENT:
  816.     case UNOP_POSTDECREMENT:
  817.     case UNOP_SIZEOF:
  818.     case UNOP_PLUS:
  819.     case UNOP_CAP:
  820.     case UNOP_CHR:
  821.     case UNOP_ORD:
  822.     case UNOP_ABS:
  823.     case UNOP_FLOAT:
  824.     case UNOP_HIGH:
  825.     case UNOP_MAX:
  826.     case UNOP_MIN:
  827.     case UNOP_ODD:
  828.     case UNOP_TRUNC:
  829.       elt = dump_subexp (exp, stream, elt);
  830.       break;
  831.     case OP_LONG:
  832.       fprintf_filtered (stream, "Type @");
  833.       gdb_print_host_address (exp->elts[elt].type, stream);
  834.       fprintf_filtered (stream, " (");
  835.       type_print (exp->elts[elt].type, NULL, stream, 0);
  836.       fprintf_filtered (stream, "), value %ld (0x%lx)",
  837.                         (long) exp->elts[elt + 1].longconst,
  838.                         (long) exp->elts[elt + 1].longconst);
  839.       elt += 3;
  840.       break;
  841.     case OP_DOUBLE:
  842.       fprintf_filtered (stream, "Type @");
  843.       gdb_print_host_address (exp->elts[elt].type, stream);
  844.       fprintf_filtered (stream, " (");
  845.       type_print (exp->elts[elt].type, NULL, stream, 0);
  846.       fprintf_filtered (stream, "), value %g",
  847.                         (double) exp->elts[elt + 1].doubleconst);
  848.       elt += 3;
  849.       break;
  850.     case OP_VAR_VALUE:
  851.       fprintf_filtered (stream, "Block @");
  852.       gdb_print_host_address (exp->elts[elt].block, stream);
  853.       fprintf_filtered (stream, ", symbol @");
  854.       gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
  855.       fprintf_filtered (stream, " (%s)",
  856.                         SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
  857.       elt += 3;
  858.       break;
  859.     case OP_VAR_ENTRY_VALUE:
  860.       fprintf_filtered (stream, "Entry value of symbol @");
  861.       gdb_print_host_address (exp->elts[elt].symbol, stream);
  862.       fprintf_filtered (stream, " (%s)",
  863.                         SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
  864.       elt += 2;
  865.       break;
  866.     case OP_LAST:
  867.       fprintf_filtered (stream, "History element %ld",
  868.                         (long) exp->elts[elt].longconst);
  869.       elt += 2;
  870.       break;
  871.     case OP_REGISTER:
  872.       fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
  873.       elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
  874.       break;
  875.     case OP_INTERNALVAR:
  876.       fprintf_filtered (stream, "Internal var @");
  877.       gdb_print_host_address (exp->elts[elt].internalvar, stream);
  878.       fprintf_filtered (stream, " (%s)",
  879.                         internalvar_name (exp->elts[elt].internalvar));
  880.       elt += 2;
  881.       break;
  882.     case OP_FUNCALL:
  883.       {
  884.         int i, nargs;

  886.         nargs = longest_to_int (exp->elts[elt].longconst);

  888.         fprintf_filtered (stream, "Number of args: %d", nargs);
  889.         elt += 2;

  891.         for (i = 1; i <= nargs + 1; i++)
  892.           elt = dump_subexp (exp, stream, elt);
  893.       }
  894.       break;
  895.     case OP_ARRAY:
  896.       {
  897.         int lower, upper;
  898.         int i;

  900.         lower = longest_to_int (exp->elts[elt].longconst);
  901.         upper = longest_to_int (exp->elts[elt + 1].longconst);

  903.         fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
  904.         elt += 3;

  906.         for (i = 1; i <= upper - lower + 1; i++)
  907.           elt = dump_subexp (exp, stream, elt);
  908.       }
  909.       break;
  910.     case UNOP_DYNAMIC_CAST:
  911.     case UNOP_REINTERPRET_CAST:
  912.     case UNOP_CAST_TYPE:
  913.     case UNOP_MEMVAL_TYPE:
  914.       fprintf_filtered (stream, " (");
  915.       elt = dump_subexp (exp, stream, elt);
  916.       fprintf_filtered (stream, ")");
  917.       elt = dump_subexp (exp, stream, elt);
  918.       break;
  919.     case UNOP_MEMVAL:
  920.     case UNOP_CAST:
  921.       fprintf_filtered (stream, "Type @");
  922.       gdb_print_host_address (exp->elts[elt].type, stream);
  923.       fprintf_filtered (stream, " (");
  924.       type_print (exp->elts[elt].type, NULL, stream, 0);
  925.       fprintf_filtered (stream, ")");
  926.       elt = dump_subexp (exp, stream, elt + 2);
  927.       break;
  928.     case UNOP_MEMVAL_TLS:
  929.       fprintf_filtered (stream, "TLS type @");
  930.       gdb_print_host_address (exp->elts[elt + 1].type, stream);
  931.       fprintf_filtered (stream, " (__thread /* \"%s\" */ ",
  932.                         (exp->elts[elt].objfile == NULL ? "(null)"
  933.                          : objfile_name (exp->elts[elt].objfile)));
  934.       type_print (exp->elts[elt + 1].type, NULL, stream, 0);
  935.       fprintf_filtered (stream, ")");
  936.       elt = dump_subexp (exp, stream, elt + 3);
  937.       break;
  938.     case OP_TYPE:
  939.       fprintf_filtered (stream, "Type @");
  940.       gdb_print_host_address (exp->elts[elt].type, stream);
  941.       fprintf_filtered (stream, " (");
  942.       type_print (exp->elts[elt].type, NULL, stream, 0);
  943.       fprintf_filtered (stream, ")");
  944.       elt += 2;
  945.       break;
  946.     case OP_TYPEOF:
  947.     case OP_DECLTYPE:
  948.       fprintf_filtered (stream, "Typeof (");
  949.       elt = dump_subexp (exp, stream, elt);
  950.       fprintf_filtered (stream, ")");
  951.       break;
  952.     case OP_TYPEID:
  953.       fprintf_filtered (stream, "typeid (");
  954.       elt = dump_subexp (exp, stream, elt);
  955.       fprintf_filtered (stream, ")");
  956.       break;
  957.     case STRUCTOP_STRUCT:
  958.     case STRUCTOP_PTR:
  959.       {
  960.         char *elem_name;
  961.         int len;

  963.         len = longest_to_int (exp->elts[elt].longconst);
  964.         elem_name = &exp->elts[elt + 1].string;

  966.         fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
  967.         elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
  968.       }
  969.       break;
  970.     case OP_SCOPE:
  971.       {
  972.         char *elem_name;
  973.         int len;

  975.         fprintf_filtered (stream, "Type @");
  976.         gdb_print_host_address (exp->elts[elt].type, stream);
  977.         fprintf_filtered (stream, " (");
  978.         type_print (exp->elts[elt].type, NULL, stream, 0);
  979.         fprintf_filtered (stream, ") ");

  981.         len = longest_to_int (exp->elts[elt + 1].longconst);
  982.         elem_name = &exp->elts[elt + 2].string;

  984.         fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
  985.         elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
  986.       }
  987.       break;
  988.     case TYPE_INSTANCE:
  989.       {
  990.         LONGEST len;

  992.         len = exp->elts[elt++].longconst;
  993.         fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
  994.         while (len-- > 0)
  995.           {
  996.             fprintf_filtered (stream, "Type @");
  997.             gdb_print_host_address (exp->elts[elt].type, stream);
  998.             fprintf_filtered (stream, " (");
  999.             type_print (exp->elts[elt].type, NULL, stream, 0);
  1000.             fprintf_filtered (stream, ")");
  1001.             elt++;
  1002.             if (len > 0)
  1003.               fputs_filtered (", ", stream);
  1004.           }
  1005.         /* Ending LEN and ending TYPE_INSTANCE.  */
  1006.         elt += 2;
  1007.         elt = dump_subexp (exp, stream, elt);
  1008.       }
  1009.       break;
  1010.     case OP_STRING:
  1011.       {
  1012.         LONGEST len = exp->elts[elt].longconst;
  1013.         LONGEST type = exp->elts[elt + 1].longconst;

  1015.         fprintf_filtered (stream, "Language-specific string type: %s",
  1016.                           plongest (type));

  1018.         /* Skip length.  */
  1019.         elt += 1;

  1021.         /* Skip string content. */
  1022.         elt += BYTES_TO_EXP_ELEM (len);

  1024.         /* Skip length and ending OP_STRING. */
  1025.         elt += 2;
  1026.       }
  1027.       break;
  1028.     default:
  1029.     case OP_NULL:
  1030.     case MULTI_SUBSCRIPT:
  1031.     case OP_F77_UNDETERMINED_ARGLIST:
  1032.     case OP_COMPLEX:
  1033.     case OP_BOOL:
  1034.     case OP_M2_STRING:
  1035.     case OP_THIS:
  1036.     case OP_NAME:
  1037.       fprintf_filtered (stream, "Unknown format");
  1038.     }

  1040.   return elt;
  1041. }

  1043. void
  1044. ‌dump_prefix_expression (struct expression *exp, struct ui_file *stream)
  1045. {
  1046.   int elt;

  1048.   fprintf_filtered (stream, "Dump of expression @ ");
  1049.   gdb_print_host_address (exp, stream);
  1050.   fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
  1051.   print_expression (exp, stream);
  1052.   fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
  1053.                     exp->language_defn->la_name, exp->nelts,
  1054.                     (long) sizeof (union exp_element));
  1055.   fputs_filtered ("\n", stream);

  1057.   for (elt = 0; elt < exp->nelts;)
  1058.     elt = dump_subexp (exp, stream, elt);
  1059.   fputs_filtered ("\n", stream);
  1060. }