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Annotation of 43BSDReno/contrib/emacs-18.55/gdb/expprint.c, revision 1.1

1.1     ! root        1: /* Print in infix form a struct expression.
        !             2:    Copyright (C) 1986 Free Software Foundation, Inc.
        !             3: 
        !             4: GDB is distributed in the hope that it will be useful, but WITHOUT ANY
        !             5: WARRANTY.  No author or distributor accepts responsibility to anyone
        !             6: for the consequences of using it or for whether it serves any
        !             7: particular purpose or works at all, unless he says so in writing.
        !             8: Refer to the GDB General Public License for full details.
        !             9: 
        !            10: Everyone is granted permission to copy, modify and redistribute GDB,
        !            11: but only under the conditions described in the GDB General Public
        !            12: License.  A copy of this license is supposed to have been given to you
        !            13: along with GDB so you can know your rights and responsibilities.  It
        !            14: should be in a file named COPYING.  Among other things, the copyright
        !            15: notice and this notice must be preserved on all copies.
        !            16: 
        !            17: In other words, go ahead and share GDB, but don't try to stop
        !            18: anyone else from sharing it farther.  Help stamp out software hoarding!
        !            19: */
        !            20: 
        !            21: #include "defs.h"
        !            22: #include "symtab.h"
        !            23: #include "expression.h"
        !            24: 
        !            25: #include <stdio.h>
        !            26: 
        !            27: /* These codes indicate operator precedences, least tightly binding first.  */
        !            28: /* Adding 1 to a precedence value is done for binary operators,
        !            29:    on the operand which is more tightly bound, so that operators
        !            30:    of equal precedence within that operand will get parentheses.  */
        !            31: /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
        !            32:    they are used as the "surrounding precedence" to force
        !            33:    various kinds of things to be parenthesized.  */
        !            34: enum precedence
        !            35: { PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_OR, PREC_AND,
        !            36:   PREC_LOGIOR, PREC_LOGAND, PREC_LOGXOR, PREC_EQUAL, PREC_ORDER,
        !            37:   PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
        !            38:   PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
        !            39: 
        !            40: /* Table mapping opcodes into strings for printing operators
        !            41:    and precedences of the operators.  */
        !            42: 
        !            43: struct op_print
        !            44: {
        !            45:   char *string;
        !            46:   enum exp_opcode opcode;
        !            47:   /* Precedence of operator.  These values are used only by comparisons.  */
        !            48:   enum precedence precedence;
        !            49:   int right_assoc;
        !            50: };
        !            51: 
        !            52: static struct op_print op_print_tab[] =
        !            53:   {
        !            54:     {",", BINOP_COMMA, PREC_COMMA, 0},
        !            55:     {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
        !            56:     {"||", BINOP_OR, PREC_OR, 0},
        !            57:     {"&&", BINOP_AND, PREC_AND, 0},
        !            58:     {"|", BINOP_LOGIOR, PREC_LOGIOR, 0},
        !            59:     {"&", BINOP_LOGAND, PREC_LOGAND, 0},
        !            60:     {"^", BINOP_LOGXOR, PREC_LOGXOR, 0},
        !            61:     {"==", BINOP_EQUAL, PREC_EQUAL, 0},
        !            62:     {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
        !            63:     {"<=", BINOP_LEQ, PREC_ORDER, 0},
        !            64:     {">=", BINOP_GEQ, PREC_ORDER, 0},
        !            65:     {">", BINOP_GTR, PREC_ORDER, 0},
        !            66:     {"<", BINOP_LESS, PREC_ORDER, 0},
        !            67:     {">>", BINOP_RSH, PREC_SHIFT, 0},
        !            68:     {"<<", BINOP_LSH, PREC_SHIFT, 0},
        !            69:     {"+", BINOP_ADD, PREC_ADD, 0},
        !            70:     {"-", BINOP_SUB, PREC_ADD, 0},
        !            71:     {"*", BINOP_MUL, PREC_MUL, 0},
        !            72:     {"/", BINOP_DIV, PREC_MUL, 0},
        !            73:     {"%", BINOP_REM, PREC_MUL, 0},
        !            74:     {"@", BINOP_REPEAT, PREC_REPEAT, 0},
        !            75:     {"-", UNOP_NEG, PREC_PREFIX, 0},
        !            76:     {"!", UNOP_ZEROP, PREC_PREFIX, 0},
        !            77:     {"~", UNOP_LOGNOT, PREC_PREFIX, 0},
        !            78:     {"*", UNOP_IND, PREC_PREFIX, 0},
        !            79:     {"&", UNOP_ADDR, PREC_PREFIX, 0},
        !            80:     {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
        !            81:     {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
        !            82:     {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0}
        !            83:   };
        !            84: 
        !            85: static void print_subexp ();
        !            86: 
        !            87: void
        !            88: print_expression (exp, stream)
        !            89:      struct expression *exp;
        !            90:      FILE *stream;
        !            91: {
        !            92:   int pc = 0;
        !            93:   print_subexp (exp, &pc, stream, PREC_NULL);
        !            94: }
        !            95: 
        !            96: /* Print the subexpression of EXP that starts in position POS, on STREAM.
        !            97:    PREC is the precedence of the surrounding operator;
        !            98:    if the precedence of the main operator of this subexpression is less,
        !            99:    parentheses are needed here.  */
        !           100: 
        !           101: static void
        !           102: print_subexp (exp, pos, stream, prec)
        !           103:      register struct expression *exp;
        !           104:      register int *pos;
        !           105:      FILE *stream;
        !           106:      enum precedence prec;
        !           107: {
        !           108:   register int tem;
        !           109:   register int pc;
        !           110:   int nargs;
        !           111:   register char *op_str;
        !           112:   int assign_modify = 0;
        !           113:   enum exp_opcode opcode;
        !           114:   enum precedence myprec;
        !           115:   /* Set to 1 for a right-associative operator.  */
        !           116:   int assoc;
        !           117: 
        !           118:   pc = (*pos)++;
        !           119:   opcode = exp->elts[pc].opcode;
        !           120:   switch (opcode)
        !           121:     {
        !           122:     case OP_LONG:
        !           123:       (*pos) += 3;
        !           124:       value_print (value_from_long (exp->elts[pc + 1].type,
        !           125:                                    exp->elts[pc + 2].longconst),
        !           126:                   stream, 0);
        !           127:       return;
        !           128: 
        !           129:     case OP_DOUBLE:
        !           130:       (*pos) += 3;
        !           131:       value_print (value_from_double (exp->elts[pc + 1].type,
        !           132:                                      exp->elts[pc + 2].doubleconst),
        !           133:                   stream, 0);
        !           134:       return;
        !           135: 
        !           136:     case OP_VAR_VALUE:
        !           137:       (*pos) += 2;
        !           138:       fprintf (stream, "%s", SYMBOL_NAME (exp->elts[pc + 1].symbol));
        !           139:       return;
        !           140: 
        !           141:     case OP_LAST:
        !           142:       (*pos) += 2;
        !           143:       fprintf (stream, "$%d", exp->elts[pc + 1].longconst);
        !           144:       return;
        !           145: 
        !           146:     case OP_REGISTER:
        !           147:       (*pos) += 2;
        !           148:       fprintf (stream, "$%s", reg_names[exp->elts[pc + 1].longconst]);
        !           149:       return;
        !           150: 
        !           151:     case OP_INTERNALVAR:
        !           152:       (*pos) += 2;
        !           153:       fprintf (stream, "$%s",
        !           154:               internalvar_name (exp->elts[pc + 1].internalvar));
        !           155:       return;
        !           156: 
        !           157:     case OP_FUNCALL:
        !           158:       (*pos) += 2;
        !           159:       nargs = exp->elts[pc + 1].longconst;
        !           160:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           161:       fprintf (stream, " (");
        !           162:       for (tem = 0; tem < nargs; tem++)
        !           163:        {
        !           164:          if (tem > 0)
        !           165:            fprintf (stream, ", ");
        !           166:          print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
        !           167:        }
        !           168:       fprintf (stream, ")");
        !           169:       return;
        !           170: 
        !           171:     case OP_STRING:
        !           172:       nargs = strlen (&exp->elts[pc + 1].string);
        !           173:       (*pos) += 2 + (nargs + sizeof (union exp_element)) / sizeof (union exp_element);
        !           174:       fprintf (stream, "\"");
        !           175:       for (tem = 0; tem < nargs; tem++)
        !           176:        printchar ((&exp->elts[pc + 1].string)[tem], stream, '"');
        !           177:       fprintf (stream, "\"");
        !           178:       return;
        !           179: 
        !           180:     case TERNOP_COND:
        !           181:       if ((int) prec > (int) PREC_COMMA)
        !           182:        fprintf (stream, "(");
        !           183:       /* Print the subexpressions, forcing parentheses
        !           184:         around any binary operations within them.
        !           185:         This is more parentheses than are strictly necessary,
        !           186:         but it looks clearer.  */
        !           187:       print_subexp (exp, pos, stream, PREC_HYPER);
        !           188:       fprintf (stream, " ? ");
        !           189:       print_subexp (exp, pos, stream, PREC_HYPER);
        !           190:       fprintf (stream, " : ");
        !           191:       print_subexp (exp, pos, stream, PREC_HYPER);
        !           192:       if ((int) prec > (int) PREC_COMMA)
        !           193:        fprintf (stream, ")");
        !           194:       return;
        !           195: 
        !           196:     case STRUCTOP_STRUCT:
        !           197:       tem = strlen (&exp->elts[pc + 1].string);
        !           198:       (*pos) += 2 + (tem + sizeof (union exp_element)) / sizeof (union exp_element);
        !           199:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           200:       fprintf (stream, ".%s", &exp->elts[pc + 1].string);
        !           201:       return;
        !           202: 
        !           203:     case STRUCTOP_PTR:
        !           204:       tem = strlen (&exp->elts[pc + 1].string);
        !           205:       (*pos) += 2 + (tem + sizeof (union exp_element)) / sizeof (union exp_element);
        !           206:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           207:       fprintf (stream, "->%s", &exp->elts[pc + 1].string);
        !           208:       return;
        !           209: 
        !           210:     case BINOP_SUBSCRIPT:
        !           211:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           212:       fprintf (stream, "[");
        !           213:       print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
        !           214:       fprintf (stream, "]");
        !           215:       return;
        !           216: 
        !           217:     case UNOP_POSTINCREMENT:
        !           218:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           219:       fprintf (stream, "++");
        !           220:       return;
        !           221: 
        !           222:     case UNOP_POSTDECREMENT:
        !           223:       print_subexp (exp, pos, stream, PREC_SUFFIX);
        !           224:       fprintf (stream, "--");
        !           225:       return;
        !           226: 
        !           227:     case UNOP_CAST:
        !           228:       (*pos) += 2;
        !           229:       if ((int) prec > (int) PREC_PREFIX)
        !           230:        fprintf (stream, "(");
        !           231:       fprintf (stream, "(");
        !           232:       type_print (exp->elts[pc + 1].type, "", stream, 0);
        !           233:       fprintf (stream, ") ");
        !           234:       print_subexp (exp, pos, stream, PREC_PREFIX);
        !           235:       if ((int) prec > (int) PREC_PREFIX)
        !           236:        fprintf (stream, ")");
        !           237:       return;
        !           238: 
        !           239:     case UNOP_MEMVAL:
        !           240:       (*pos) += 2;
        !           241:       if ((int) prec > (int) PREC_PREFIX)
        !           242:        fprintf (stream, "(");
        !           243:       fprintf (stream, "{");
        !           244:       type_print (exp->elts[pc + 1].type, "", stream, 0);
        !           245:       fprintf (stream, "} ");
        !           246:       print_subexp (exp, pos, stream, PREC_PREFIX);
        !           247:       if ((int) prec > (int) PREC_PREFIX)
        !           248:        fprintf (stream, ")");
        !           249:       return;
        !           250: 
        !           251:     case BINOP_ASSIGN_MODIFY:
        !           252:       opcode = exp->elts[pc + 1].opcode;
        !           253:       (*pos) += 2;
        !           254:       myprec = PREC_ASSIGN;
        !           255:       assoc = 1;
        !           256:       assign_modify = 1;
        !           257:       for (tem = 0; tem < sizeof op_print_tab / sizeof op_print_tab[0]; tem++)
        !           258:        if (op_print_tab[tem].opcode == opcode)
        !           259:          {
        !           260:            op_str = op_print_tab[tem].string;
        !           261:            break;
        !           262:          }
        !           263: 
        !           264:     default:
        !           265:       for (tem = 0; tem < sizeof op_print_tab / sizeof op_print_tab[0]; tem++)
        !           266:        if (op_print_tab[tem].opcode == opcode)
        !           267:          {
        !           268:            op_str = op_print_tab[tem].string;
        !           269:            myprec = op_print_tab[tem].precedence;
        !           270:            assoc = op_print_tab[tem].right_assoc;
        !           271:            break;
        !           272:          }
        !           273:     }
        !           274: 
        !           275:   if ((int) myprec < (int) prec)
        !           276:     fprintf (stream, "(");
        !           277:   if ((int) opcode > (int) BINOP_END)
        !           278:     {
        !           279:       /* Unary prefix operator.  */
        !           280:       fprintf (stream, "%s", op_str);
        !           281:       print_subexp (exp, pos, stream, PREC_PREFIX);
        !           282:     }
        !           283:   else
        !           284:     {
        !           285:       /* Binary operator.  */
        !           286:       /* Print left operand.
        !           287:         If operator is right-associative,
        !           288:         increment precedence for this operand.  */
        !           289:       print_subexp (exp, pos, stream, (int) myprec + assoc);
        !           290:       /* Print the operator itself.  */
        !           291:       if (assign_modify)
        !           292:        fprintf (stream, " %s= ", op_str);
        !           293:       else if (op_str[0] == ',')
        !           294:        fprintf (stream, "%s ", op_str);
        !           295:       else
        !           296:        fprintf (stream, " %s ", op_str);
        !           297:       /* Print right operand.
        !           298:         If operator is left-associative,
        !           299:         increment precedence for this operand.  */
        !           300:       print_subexp (exp, pos, stream, (int) myprec + !assoc);
        !           301:     }
        !           302:   if ((int) myprec < (int) prec)
        !           303:     fprintf (stream, ")");
        !           304: }

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