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-/* YACC grammar for Modula-2 expressions, for GDB.
- Copyright (C) 1986, 1989, 1990, 1991, 1993, 1994, 1995
- Free Software Foundation, Inc.
- Generated from expread.y (now c-exp.y) and contributed by the Department
- of Computer Science at the State University of New York at Buffalo, 1991.
-
-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. */
-
-/* Parse a Modula-2 expression from text in a string,
- and return the result as a struct expression pointer.
- That structure contains arithmetic operations in reverse polish,
- with constants represented by operations that are followed by special data.
- See expression.h for the details of the format.
- What is important here is that it can be built up sequentially
- during the process of parsing; the lower levels of the tree always
- come first in the result.
-
- Note that malloc's and realloc's in this file are transformed to
- xmalloc and xrealloc respectively by the same sed command in the
- makefile that remaps any other malloc/realloc inserted by the parser
- generator. Doing this with #defines and trying to control the interaction
- with include files (<malloc.h> and <stdlib.h> for example) just became
- too messy, particularly when such includes can be inserted at random
- times by the parser generator. */
-
-%{
-
-#include "defs.h"
-#include "gdb_string.h"
-#include "expression.h"
-#include "language.h"
-#include "value.h"
-#include "parser-defs.h"
-#include "m2-lang.h"
-#include "bfd.h" /* Required by objfiles.h. */
-#include "symfile.h" /* Required by objfiles.h. */
-#include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
-
-/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
- as well as gratuitiously global symbol names, so we can have multiple
- yacc generated parsers in gdb. Note that these are only the variables
- produced by yacc. If other parser generators (bison, byacc, etc) produce
- additional global names that conflict at link time, then those parser
- generators need to be fixed instead of adding those names to this list. */
-
-#define yymaxdepth m2_maxdepth
-#define yyparse m2_parse
-#define yylex m2_lex
-#define yyerror m2_error
-#define yylval m2_lval
-#define yychar m2_char
-#define yydebug m2_debug
-#define yypact m2_pact
-#define yyr1 m2_r1
-#define yyr2 m2_r2
-#define yydef m2_def
-#define yychk m2_chk
-#define yypgo m2_pgo
-#define yyact m2_act
-#define yyexca m2_exca
-#define yyerrflag m2_errflag
-#define yynerrs m2_nerrs
-#define yyps m2_ps
-#define yypv m2_pv
-#define yys m2_s
-#define yy_yys m2_yys
-#define yystate m2_state
-#define yytmp m2_tmp
-#define yyv m2_v
-#define yy_yyv m2_yyv
-#define yyval m2_val
-#define yylloc m2_lloc
-#define yyreds m2_reds /* With YYDEBUG defined */
-#define yytoks m2_toks /* With YYDEBUG defined */
-#define yylhs m2_yylhs
-#define yylen m2_yylen
-#define yydefred m2_yydefred
-#define yydgoto m2_yydgoto
-#define yysindex m2_yysindex
-#define yyrindex m2_yyrindex
-#define yygindex m2_yygindex
-#define yytable m2_yytable
-#define yycheck m2_yycheck
-
-#ifndef YYDEBUG
-#define YYDEBUG 0 /* Default to no yydebug support */
-#endif
-
-int
-yyparse PARAMS ((void));
-
-static int
-yylex PARAMS ((void));
-
-void
-yyerror PARAMS ((char *));
-
-#if 0
-static char *
-make_qualname PARAMS ((char *, char *));
-#endif
-
-static int
-parse_number PARAMS ((int));
-
-/* The sign of the number being parsed. */
-static int number_sign = 1;
-
-/* The block that the module specified by the qualifer on an identifer is
- contained in, */
-#if 0
-static struct block *modblock=0;
-#endif
-
-%}
-
-/* Although the yacc "value" of an expression is not used,
- since the result is stored in the structure being created,
- other node types do have values. */
-
-%union
- {
- LONGEST lval;
- ULONGEST ulval;
- DOUBLEST dval;
- struct symbol *sym;
- struct type *tval;
- struct stoken sval;
- int voidval;
- struct block *bval;
- enum exp_opcode opcode;
- struct internalvar *ivar;
-
- struct type **tvec;
- int *ivec;
- }
-
-%type <voidval> exp type_exp start set
-%type <voidval> variable
-%type <tval> type
-%type <bval> block
-%type <sym> fblock
-
-%token <lval> INT HEX ERROR
-%token <ulval> UINT M2_TRUE M2_FALSE CHAR
-%token <dval> FLOAT
-
-/* Both NAME and TYPENAME tokens represent symbols in the input,
- and both convey their data as strings.
- But a TYPENAME is a string that happens to be defined as a typedef
- or builtin type name (such as int or char)
- and a NAME is any other symbol.
-
- Contexts where this distinction is not important can use the
- nonterminal "name", which matches either NAME or TYPENAME. */
-
-%token <sval> STRING
-%token <sval> NAME BLOCKNAME IDENT VARNAME
-%token <sval> TYPENAME
-
-%token SIZE CAP ORD HIGH ABS MIN_FUNC MAX_FUNC FLOAT_FUNC VAL CHR ODD TRUNC
-%token INC DEC INCL EXCL
-
-/* The GDB scope operator */
-%token COLONCOLON
-
-%token <voidval> INTERNAL_VAR
-
-/* M2 tokens */
-%left ','
-%left ABOVE_COMMA
-%nonassoc ASSIGN
-%left '<' '>' LEQ GEQ '=' NOTEQUAL '#' IN
-%left OROR
-%left LOGICAL_AND '&'
-%left '@'
-%left '+' '-'
-%left '*' '/' DIV MOD
-%right UNARY
-%right '^' DOT '[' '('
-%right NOT '~'
-%left COLONCOLON QID
-/* This is not an actual token ; it is used for precedence.
-%right QID
-*/
-
-
-%%
-
-start : exp
- | type_exp
- ;
-
-type_exp: type
- { write_exp_elt_opcode(OP_TYPE);
- write_exp_elt_type($1);
- write_exp_elt_opcode(OP_TYPE);
- }
- ;
-
-/* Expressions */
-
-exp : exp '^' %prec UNARY
- { write_exp_elt_opcode (UNOP_IND); }
-
-exp : '-'
- { number_sign = -1; }
- exp %prec UNARY
- { number_sign = 1;
- write_exp_elt_opcode (UNOP_NEG); }
- ;
-
-exp : '+' exp %prec UNARY
- { write_exp_elt_opcode(UNOP_PLUS); }
- ;
-
-exp : not_exp exp %prec UNARY
- { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
- ;
-
-not_exp : NOT
- | '~'
- ;
-
-exp : CAP '(' exp ')'
- { write_exp_elt_opcode (UNOP_CAP); }
- ;
-
-exp : ORD '(' exp ')'
- { write_exp_elt_opcode (UNOP_ORD); }
- ;
-
-exp : ABS '(' exp ')'
- { write_exp_elt_opcode (UNOP_ABS); }
- ;
-
-exp : HIGH '(' exp ')'
- { write_exp_elt_opcode (UNOP_HIGH); }
- ;
-
-exp : MIN_FUNC '(' type ')'
- { write_exp_elt_opcode (UNOP_MIN);
- write_exp_elt_type ($3);
- write_exp_elt_opcode (UNOP_MIN); }
- ;
-
-exp : MAX_FUNC '(' type ')'
- { write_exp_elt_opcode (UNOP_MAX);
- write_exp_elt_type ($3);
- write_exp_elt_opcode (UNOP_MIN); }
- ;
-
-exp : FLOAT_FUNC '(' exp ')'
- { write_exp_elt_opcode (UNOP_FLOAT); }
- ;
-
-exp : VAL '(' type ',' exp ')'
- { write_exp_elt_opcode (BINOP_VAL);
- write_exp_elt_type ($3);
- write_exp_elt_opcode (BINOP_VAL); }
- ;
-
-exp : CHR '(' exp ')'
- { write_exp_elt_opcode (UNOP_CHR); }
- ;
-
-exp : ODD '(' exp ')'
- { write_exp_elt_opcode (UNOP_ODD); }
- ;
-
-exp : TRUNC '(' exp ')'
- { write_exp_elt_opcode (UNOP_TRUNC); }
- ;
-
-exp : SIZE exp %prec UNARY
- { write_exp_elt_opcode (UNOP_SIZEOF); }
- ;
-
-
-exp : INC '(' exp ')'
- { write_exp_elt_opcode(UNOP_PREINCREMENT); }
- ;
-
-exp : INC '(' exp ',' exp ')'
- { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
- write_exp_elt_opcode(BINOP_ADD);
- write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
- ;
-
-exp : DEC '(' exp ')'
- { write_exp_elt_opcode(UNOP_PREDECREMENT);}
- ;
-
-exp : DEC '(' exp ',' exp ')'
- { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
- write_exp_elt_opcode(BINOP_SUB);
- write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
- ;
-
-exp : exp DOT NAME
- { write_exp_elt_opcode (STRUCTOP_STRUCT);
- write_exp_string ($3);
- write_exp_elt_opcode (STRUCTOP_STRUCT); }
- ;
-
-exp : set
- ;
-
-exp : exp IN set
- { error("Sets are not implemented.");}
- ;
-
-exp : INCL '(' exp ',' exp ')'
- { error("Sets are not implemented.");}
- ;
-
-exp : EXCL '(' exp ',' exp ')'
- { error("Sets are not implemented.");}
-
-set : '{' arglist '}'
- { error("Sets are not implemented.");}
- | type '{' arglist '}'
- { error("Sets are not implemented.");}
- ;
-
-
-/* Modula-2 array subscript notation [a,b,c...] */
-exp : exp '['
- /* This function just saves the number of arguments
- that follow in the list. It is *not* specific to
- function types */
- { start_arglist(); }
- non_empty_arglist ']' %prec DOT
- { write_exp_elt_opcode (MULTI_SUBSCRIPT);
- write_exp_elt_longcst ((LONGEST) end_arglist());
- write_exp_elt_opcode (MULTI_SUBSCRIPT); }
- ;
-
-exp : exp '('
- /* This is to save the value of arglist_len
- being accumulated by an outer function call. */
- { start_arglist (); }
- arglist ')' %prec DOT
- { write_exp_elt_opcode (OP_FUNCALL);
- write_exp_elt_longcst ((LONGEST) end_arglist ());
- write_exp_elt_opcode (OP_FUNCALL); }
- ;
-
-arglist :
- ;
-
-arglist : exp
- { arglist_len = 1; }
- ;
-
-arglist : arglist ',' exp %prec ABOVE_COMMA
- { arglist_len++; }
- ;
-
-non_empty_arglist
- : exp
- { arglist_len = 1; }
- ;
-
-non_empty_arglist
- : non_empty_arglist ',' exp %prec ABOVE_COMMA
- { arglist_len++; }
- ;
-
-/* GDB construct */
-exp : '{' type '}' exp %prec UNARY
- { write_exp_elt_opcode (UNOP_MEMVAL);
- write_exp_elt_type ($2);
- write_exp_elt_opcode (UNOP_MEMVAL); }
- ;
-
-exp : type '(' exp ')' %prec UNARY
- { write_exp_elt_opcode (UNOP_CAST);
- write_exp_elt_type ($1);
- write_exp_elt_opcode (UNOP_CAST); }
- ;
-
-exp : '(' exp ')'
- { }
- ;
-
-/* Binary operators in order of decreasing precedence. Note that some
- of these operators are overloaded! (ie. sets) */
-
-/* GDB construct */
-exp : exp '@' exp
- { write_exp_elt_opcode (BINOP_REPEAT); }
- ;
-
-exp : exp '*' exp
- { write_exp_elt_opcode (BINOP_MUL); }
- ;
-
-exp : exp '/' exp
- { write_exp_elt_opcode (BINOP_DIV); }
- ;
-
-exp : exp DIV exp
- { write_exp_elt_opcode (BINOP_INTDIV); }
- ;
-
-exp : exp MOD exp
- { write_exp_elt_opcode (BINOP_REM); }
- ;
-
-exp : exp '+' exp
- { write_exp_elt_opcode (BINOP_ADD); }
- ;
-
-exp : exp '-' exp
- { write_exp_elt_opcode (BINOP_SUB); }
- ;
-
-exp : exp '=' exp
- { write_exp_elt_opcode (BINOP_EQUAL); }
- ;
-
-exp : exp NOTEQUAL exp
- { write_exp_elt_opcode (BINOP_NOTEQUAL); }
- | exp '#' exp
- { write_exp_elt_opcode (BINOP_NOTEQUAL); }
- ;
-
-exp : exp LEQ exp
- { write_exp_elt_opcode (BINOP_LEQ); }
- ;
-
-exp : exp GEQ exp
- { write_exp_elt_opcode (BINOP_GEQ); }
- ;
-
-exp : exp '<' exp
- { write_exp_elt_opcode (BINOP_LESS); }
- ;
-
-exp : exp '>' exp
- { write_exp_elt_opcode (BINOP_GTR); }
- ;
-
-exp : exp LOGICAL_AND exp
- { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
- ;
-
-exp : exp OROR exp
- { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
- ;
-
-exp : exp ASSIGN exp
- { write_exp_elt_opcode (BINOP_ASSIGN); }
- ;
-
-
-/* Constants */
-
-exp : M2_TRUE
- { write_exp_elt_opcode (OP_BOOL);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_BOOL); }
- ;
-
-exp : M2_FALSE
- { write_exp_elt_opcode (OP_BOOL);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_BOOL); }
- ;
-
-exp : INT
- { write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type (builtin_type_m2_int);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_LONG); }
- ;
-
-exp : UINT
- {
- write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type (builtin_type_m2_card);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_LONG);
- }
- ;
-
-exp : CHAR
- { write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type (builtin_type_m2_char);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_LONG); }
- ;
-
-
-exp : FLOAT
- { write_exp_elt_opcode (OP_DOUBLE);
- write_exp_elt_type (builtin_type_m2_real);
- write_exp_elt_dblcst ($1);
- write_exp_elt_opcode (OP_DOUBLE); }
- ;
-
-exp : variable
- ;
-
-exp : SIZE '(' type ')' %prec UNARY
- { write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type (builtin_type_int);
- write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
- write_exp_elt_opcode (OP_LONG); }
- ;
-
-exp : STRING
- { write_exp_elt_opcode (OP_M2_STRING);
- write_exp_string ($1);
- write_exp_elt_opcode (OP_M2_STRING); }
- ;
-
-/* This will be used for extensions later. Like adding modules. */
-block : fblock
- { $$ = SYMBOL_BLOCK_VALUE($1); }
- ;
-
-fblock : BLOCKNAME
- { struct symbol *sym
- = lookup_symbol (copy_name ($1), expression_context_block,
- VAR_NAMESPACE, 0, NULL);
- $$ = sym;}
- ;
-
-
-/* GDB scope operator */
-fblock : block COLONCOLON BLOCKNAME
- { struct symbol *tem
- = lookup_symbol (copy_name ($3), $1,
- VAR_NAMESPACE, 0, NULL);
- if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
- error ("No function \"%s\" in specified context.",
- copy_name ($3));
- $$ = tem;
- }
- ;
-
-/* Useful for assigning to PROCEDURE variables */
-variable: fblock
- { write_exp_elt_opcode(OP_VAR_VALUE);
- write_exp_elt_block (NULL);
- write_exp_elt_sym ($1);
- write_exp_elt_opcode (OP_VAR_VALUE); }
- ;
-
-/* GDB internal ($foo) variable */
-variable: INTERNAL_VAR
- ;
-
-/* GDB scope operator */
-variable: block COLONCOLON NAME
- { struct symbol *sym;
- sym = lookup_symbol (copy_name ($3), $1,
- VAR_NAMESPACE, 0, NULL);
- if (sym == 0)
- error ("No symbol \"%s\" in specified context.",
- copy_name ($3));
-
- write_exp_elt_opcode (OP_VAR_VALUE);
- /* block_found is set by lookup_symbol. */
- write_exp_elt_block (block_found);
- write_exp_elt_sym (sym);
- write_exp_elt_opcode (OP_VAR_VALUE); }
- ;
-
-/* Base case for variables. */
-variable: NAME
- { struct symbol *sym;
- int is_a_field_of_this;
-
- sym = lookup_symbol (copy_name ($1),
- expression_context_block,
- VAR_NAMESPACE,
- &is_a_field_of_this,
- NULL);
- if (sym)
- {
- if (symbol_read_needs_frame (sym))
- {
- if (innermost_block == 0 ||
- contained_in (block_found,
- innermost_block))
- innermost_block = block_found;
- }
-
- write_exp_elt_opcode (OP_VAR_VALUE);
- /* We want to use the selected frame, not
- another more inner frame which happens to
- be in the same block. */
- write_exp_elt_block (NULL);
- write_exp_elt_sym (sym);
- write_exp_elt_opcode (OP_VAR_VALUE);
- }
- else
- {
- struct minimal_symbol *msymbol;
- register char *arg = copy_name ($1);
-
- msymbol =
- lookup_minimal_symbol (arg, NULL, NULL);
- if (msymbol != NULL)
- {
- write_exp_msymbol
- (msymbol,
- lookup_function_type (builtin_type_int),
- builtin_type_int);
- }
- else if (!have_full_symbols () && !have_partial_symbols ())
- error ("No symbol table is loaded. Use the \"symbol-file\" command.");
- else
- error ("No symbol \"%s\" in current context.",
- copy_name ($1));
- }
- }
- ;
-
-type
- : TYPENAME
- { $$ = lookup_typename (copy_name ($1),
- expression_context_block, 0); }
-
- ;
-
-%%
-
-#if 0 /* FIXME! */
-int
-overflow(a,b)
- long a,b;
-{
- return (MAX_OF_TYPE(builtin_type_m2_int) - b) < a;
-}
-
-int
-uoverflow(a,b)
- unsigned long a,b;
-{
- return (MAX_OF_TYPE(builtin_type_m2_card) - b) < a;
-}
-#endif /* FIXME */
-
-/* Take care of parsing a number (anything that starts with a digit).
- Set yylval and return the token type; update lexptr.
- LEN is the number of characters in it. */
-
-/*** Needs some error checking for the float case ***/
-
-static int
-parse_number (olen)
- int olen;
-{
- register char *p = lexptr;
- register LONGEST n = 0;
- register LONGEST prevn = 0;
- register int c,i,ischar=0;
- register int base = input_radix;
- register int len = olen;
- int unsigned_p = number_sign == 1 ? 1 : 0;
-
- if(p[len-1] == 'H')
- {
- base = 16;
- len--;
- }
- else if(p[len-1] == 'C' || p[len-1] == 'B')
- {
- base = 8;
- ischar = p[len-1] == 'C';
- len--;
- }
-
- /* Scan the number */
- for (c = 0; c < len; c++)
- {
- if (p[c] == '.' && base == 10)
- {
- /* It's a float since it contains a point. */
- yylval.dval = atof (p);
- lexptr += len;
- return FLOAT;
- }
- if (p[c] == '.' && base != 10)
- error("Floating point numbers must be base 10.");
- if (base == 10 && (p[c] < '0' || p[c] > '9'))
- error("Invalid digit \'%c\' in number.",p[c]);
- }
-
- while (len-- > 0)
- {
- c = *p++;
- n *= base;
- if( base == 8 && (c == '8' || c == '9'))
- error("Invalid digit \'%c\' in octal number.",c);
- if (c >= '0' && c <= '9')
- i = c - '0';
- else
- {
- if (base == 16 && c >= 'A' && c <= 'F')
- i = c - 'A' + 10;
- else
- return ERROR;
- }
- n+=i;
- if(i >= base)
- return ERROR;
- if(!unsigned_p && number_sign == 1 && (prevn >= n))
- unsigned_p=1; /* Try something unsigned */
- /* Don't do the range check if n==i and i==0, since that special
- case will give an overflow error. */
- if(RANGE_CHECK && n!=i && i)
- {
- if((unsigned_p && (unsigned)prevn >= (unsigned)n) ||
- ((!unsigned_p && number_sign==-1) && -prevn <= -n))
- range_error("Overflow on numeric constant.");
- }
- prevn=n;
- }
-
- lexptr = p;
- if(*p == 'B' || *p == 'C' || *p == 'H')
- lexptr++; /* Advance past B,C or H */
-
- if (ischar)
- {
- yylval.ulval = n;
- return CHAR;
- }
- else if ( unsigned_p && number_sign == 1)
- {
- yylval.ulval = n;
- return UINT;
- }
- else if((unsigned_p && (n<0))) {
- range_error("Overflow on numeric constant -- number too large.");
- /* But, this can return if range_check == range_warn. */
- }
- yylval.lval = n;
- return INT;
-}
-
-
-/* Some tokens */
-
-static struct
-{
- char name[2];
- int token;
-} tokentab2[] =
-{
- { {'<', '>'}, NOTEQUAL },
- { {':', '='}, ASSIGN },
- { {'<', '='}, LEQ },
- { {'>', '='}, GEQ },
- { {':', ':'}, COLONCOLON },
-
-};
-
-/* Some specific keywords */
-
-struct keyword {
- char keyw[10];
- int token;
-};
-
-static struct keyword keytab[] =
-{
- {"OR" , OROR },
- {"IN", IN },/* Note space after IN */
- {"AND", LOGICAL_AND},
- {"ABS", ABS },
- {"CHR", CHR },
- {"DEC", DEC },
- {"NOT", NOT },
- {"DIV", DIV },
- {"INC", INC },
- {"MAX", MAX_FUNC },
- {"MIN", MIN_FUNC },
- {"MOD", MOD },
- {"ODD", ODD },
- {"CAP", CAP },
- {"ORD", ORD },
- {"VAL", VAL },
- {"EXCL", EXCL },
- {"HIGH", HIGH },
- {"INCL", INCL },
- {"SIZE", SIZE },
- {"FLOAT", FLOAT_FUNC },
- {"TRUNC", TRUNC },
-};
-
-
-/* Read one token, getting characters through lexptr. */
-
-/* This is where we will check to make sure that the language and the operators used are
- compatible */
-
-static int
-yylex ()
-{
- register int c;
- register int namelen;
- register int i;
- register char *tokstart;
- register char quote;
-
- retry:
-
- tokstart = lexptr;
-
-
- /* See if it is a special token of length 2 */
- for( i = 0 ; i < (int) (sizeof tokentab2 / sizeof tokentab2[0]) ; i++)
- if(STREQN(tokentab2[i].name, tokstart, 2))
- {
- lexptr += 2;
- return tokentab2[i].token;
- }
-
- switch (c = *tokstart)
- {
- case 0:
- return 0;
-
- case ' ':
- case '\t':
- case '\n':
- lexptr++;
- goto retry;
-
- case '(':
- paren_depth++;
- lexptr++;
- return c;
-
- case ')':
- if (paren_depth == 0)
- return 0;
- paren_depth--;
- lexptr++;
- return c;
-
- case ',':
- if (comma_terminates && paren_depth == 0)
- return 0;
- lexptr++;
- return c;
-
- case '.':
- /* Might be a floating point number. */
- if (lexptr[1] >= '0' && lexptr[1] <= '9')
- break; /* Falls into number code. */
- else
- {
- lexptr++;
- return DOT;
- }
-
-/* These are character tokens that appear as-is in the YACC grammar */
- case '+':
- case '-':
- case '*':
- case '/':
- case '^':
- case '<':
- case '>':
- case '[':
- case ']':
- case '=':
- case '{':
- case '}':
- case '#':
- case '@':
- case '~':
- case '&':
- lexptr++;
- return c;
-
- case '\'' :
- case '"':
- quote = c;
- for (namelen = 1; (c = tokstart[namelen]) != quote && c != '\0'; namelen++)
- if (c == '\\')
- {
- c = tokstart[++namelen];
- if (c >= '0' && c <= '9')
- {
- c = tokstart[++namelen];
- if (c >= '0' && c <= '9')
- c = tokstart[++namelen];
- }
- }
- if(c != quote)
- error("Unterminated string or character constant.");
- yylval.sval.ptr = tokstart + 1;
- yylval.sval.length = namelen - 1;
- lexptr += namelen + 1;
-
- if(namelen == 2) /* Single character */
- {
- yylval.ulval = tokstart[1];
- return CHAR;
- }
- else
- return STRING;
- }
-
- /* Is it a number? */
- /* Note: We have already dealt with the case of the token '.'.
- See case '.' above. */
- if ((c >= '0' && c <= '9'))
- {
- /* It's a number. */
- int got_dot = 0, got_e = 0;
- register char *p = tokstart;
- int toktype;
-
- for (++p ;; ++p)
- {
- if (!got_e && (*p == 'e' || *p == 'E'))
- got_dot = got_e = 1;
- else if (!got_dot && *p == '.')
- got_dot = 1;
- else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
- && (*p == '-' || *p == '+'))
- /* This is the sign of the exponent, not the end of the
- number. */
- continue;
- else if ((*p < '0' || *p > '9') &&
- (*p < 'A' || *p > 'F') &&
- (*p != 'H')) /* Modula-2 hexadecimal number */
- break;
- }
- toktype = parse_number (p - tokstart);
- if (toktype == ERROR)
- {
- char *err_copy = (char *) alloca (p - tokstart + 1);
-
- memcpy (err_copy, tokstart, p - tokstart);
- err_copy[p - tokstart] = 0;
- error ("Invalid number \"%s\".", err_copy);
- }
- lexptr = p;
- return toktype;
- }
-
- if (!(c == '_' || c == '$'
- || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
- /* We must have come across a bad character (e.g. ';'). */
- error ("Invalid character '%c' in expression.", c);
-
- /* It's a name. See how long it is. */
- namelen = 0;
- for (c = tokstart[namelen];
- (c == '_' || c == '$' || (c >= '0' && c <= '9')
- || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
- c = tokstart[++namelen])
- ;
-
- /* The token "if" terminates the expression and is NOT
- removed from the input stream. */
- if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
- {
- return 0;
- }
-
- lexptr += namelen;
-
- /* Lookup special keywords */
- for(i = 0 ; i < (int) (sizeof(keytab) / sizeof(keytab[0])) ; i++)
- if(namelen == strlen(keytab[i].keyw) && STREQN(tokstart,keytab[i].keyw,namelen))
- return keytab[i].token;
-
- yylval.sval.ptr = tokstart;
- yylval.sval.length = namelen;
-
- if (*tokstart == '$')
- {
- write_dollar_variable (yylval.sval);
- return INTERNAL_VAR;
- }
-
- /* Use token-type BLOCKNAME for symbols that happen to be defined as
- functions. If this is not so, then ...
- Use token-type TYPENAME for symbols that happen to be defined
- currently as names of types; NAME for other symbols.
- The caller is not constrained to care about the distinction. */
- {
-
-
- char *tmp = copy_name (yylval.sval);
- struct symbol *sym;
-
- if (lookup_partial_symtab (tmp))
- return BLOCKNAME;
- sym = lookup_symbol (tmp, expression_context_block,
- VAR_NAMESPACE, 0, NULL);
- if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
- return BLOCKNAME;
- if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1))
- return TYPENAME;
-
- if(sym)
- {
- switch(sym->aclass)
- {
- case LOC_STATIC:
- case LOC_REGISTER:
- case LOC_ARG:
- case LOC_REF_ARG:
- case LOC_REGPARM:
- case LOC_REGPARM_ADDR:
- case LOC_LOCAL:
- case LOC_LOCAL_ARG:
- case LOC_BASEREG:
- case LOC_BASEREG_ARG:
- case LOC_CONST:
- case LOC_CONST_BYTES:
- case LOC_OPTIMIZED_OUT:
- return NAME;
-
- case LOC_TYPEDEF:
- return TYPENAME;
-
- case LOC_BLOCK:
- return BLOCKNAME;
-
- case LOC_UNDEF:
- error("internal: Undefined class in m2lex()");
-
- case LOC_LABEL:
- case LOC_UNRESOLVED:
- error("internal: Unforseen case in m2lex()");
- }
- }
- else
- {
- /* Built-in BOOLEAN type. This is sort of a hack. */
- if(STREQN(tokstart,"TRUE",4))
- {
- yylval.ulval = 1;
- return M2_TRUE;
- }
- else if(STREQN(tokstart,"FALSE",5))
- {
- yylval.ulval = 0;
- return M2_FALSE;
- }
- }
-
- /* Must be another type of name... */
- return NAME;
- }
-}
-
-#if 0 /* Unused */
-static char *
-make_qualname(mod,ident)
- char *mod, *ident;
-{
- char *new = malloc(strlen(mod)+strlen(ident)+2);
-
- strcpy(new,mod);
- strcat(new,".");
- strcat(new,ident);
- return new;
-}
-#endif /* 0 */
-
-void
-yyerror (msg)
- char *msg;
-{
- error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);
-}
generated by cgit v1.1 at 2024-11-04 14:58:44 +0000