-/* YACC grammar for Chill expressions, for GDB.
- Copyright (C) 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-/* Parse a Chill 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.
-
- Also note that the language accepted by this parser is more liberal
- than the one accepted by an actual Chill compiler. For example, the
- language rule that a simple name string can not be one of the reserved
- simple name strings is not enforced (e.g "case" is not treated as a
- reserved name). Another example is that Chill is a strongly typed
- language, and certain expressions that violate the type constraints
- may still be evaluated if gdb can do so in a meaningful manner, while
- such expressions would be rejected by the compiler. The reason for
- this more liberal behavior is the philosophy that the debugger
- is intended to be a tool that is used by the programmer when things
- go wrong, and as such, it should provide as few artificial barriers
- to it's use as possible. If it can do something meaningful, even
- something that violates language contraints that are enforced by the
- compiler, it should do so without complaint.
-
- */
-
-%{
-
-#include "defs.h"
-#include "expression.h"
-#include "language.h"
-#include "value.h"
-#include "parser-defs.h"
-#include "ch-lang.h"
-
-/* 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 chill_maxdepth
-#define yyparse chill_parse
-#define yylex chill_lex
-#define yyerror chill_error
-#define yylval chill_lval
-#define yychar chill_char
-#define yydebug chill_debug
-#define yypact chill_pact
-#define yyr1 chill_r1
-#define yyr2 chill_r2
-#define yydef chill_def
-#define yychk chill_chk
-#define yypgo chill_pgo
-#define yyact chill_act
-#define yyexca chill_exca
-#define yyerrflag chill_errflag
-#define yynerrs chill_nerrs
-#define yyps chill_ps
-#define yypv chill_pv
-#define yys chill_s
-#define yy_yys chill_yys
-#define yystate chill_state
-#define yytmp chill_tmp
-#define yyv chill_v
-#define yy_yyv chill_yyv
-#define yyval chill_val
-#define yylloc chill_lloc
-#define yyreds chill_reds /* With YYDEBUG defined */
-#define yytoks chill_toks /* With YYDEBUG defined */
-
-#ifndef YYDEBUG
-#define YYDEBUG 0 /* Default to no yydebug support */
-#endif
-
-int
-yyparse PARAMS ((void));
-
-static int
-yylex PARAMS ((void));
-
-void
-yyerror PARAMS ((char *));
-
-%}
-
-/* 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;
- unsigned LONGEST ulval;
- struct {
- LONGEST val;
- struct type *type;
- } typed_val;
- double dval;
- struct symbol *sym;
- struct type *tval;
- struct stoken sval;
- struct ttype tsym;
- struct symtoken ssym;
- int voidval;
- struct block *bval;
- enum exp_opcode opcode;
- struct internalvar *ivar;
-
- struct type **tvec;
- int *ivec;
- }
-
-%token <voidval> FIXME
-
-%token <typed_val> INTEGER_LITERAL
-%token <ulval> BOOLEAN_LITERAL
-%token <typed_val> CHARACTER_LITERAL
-%token <dval> FLOAT_LITERAL
-%token <ssym> GENERAL_PROCEDURE_NAME
-%token <ssym> LOCATION_NAME
-%token <voidval> SET_LITERAL
-%token <voidval> EMPTINESS_LITERAL
-%token <voidval> CHARACTER_STRING_LITERAL
-%token <voidval> BIT_STRING_LITERAL
-
-%token <voidval> STRING
-%token <voidval> CONSTANT
-%token <voidval> '.'
-%token <voidval> ';'
-%token <voidval> ':'
-%token <voidval> CASE
-%token <voidval> OF
-%token <voidval> ESAC
-%token <voidval> LOGIOR
-%token <voidval> ORIF
-%token <voidval> LOGXOR
-%token <voidval> LOGAND
-%token <voidval> ANDIF
-%token <voidval> '='
-%token <voidval> NOTEQUAL
-%token <voidval> '>'
-%token <voidval> GTR
-%token <voidval> '<'
-%token <voidval> LEQ
-%token <voidval> IN
-%token <voidval> '+'
-%token <voidval> '-'
-%token <voidval> '*'
-%token <voidval> '/'
-%token <voidval> SLASH_SLASH
-%token <voidval> MOD
-%token <voidval> REM
-%token <voidval> NOT
-%token <voidval> POINTER
-%token <voidval> RECEIVE
-%token <voidval> SC
-%token <voidval> '['
-%token <voidval> ']'
-%token <voidval> '('
-%token <voidval> ')'
-%token <voidval> UP
-%token <voidval> IF
-%token <voidval> THEN
-%token <voidval> ELSE
-%token <voidval> FI
-%token <voidval> ELSIF
-%token <voidval> ILLEGAL_TOKEN
-
-/* Tokens which are not Chill tokens used in expressions, but rather GDB
- specific things that we recognize in the same context as Chill tokens
- (register names for example). */
-
-%token <lval> GDB_REGNAME /* Machine register name */
-%token <lval> GDB_LAST /* Value history */
-%token <ivar> GDB_VARIABLE /* Convenience variable */
-%token <voidval> GDB_ASSIGNMENT /* Assign value to somewhere */
-
-%type <voidval> location
-%type <voidval> access_name
-%type <voidval> primitive_value
-%type <voidval> location_contents
-%type <voidval> value_name
-%type <voidval> literal
-%type <voidval> tuple
-%type <voidval> value_string_element
-%type <voidval> value_string_slice
-%type <voidval> value_array_element
-%type <voidval> value_array_slice
-%type <voidval> value_structure_field
-%type <voidval> expression_conversion
-%type <voidval> value_procedure_call
-%type <voidval> value_built_in_routine_call
-%type <voidval> start_expression
-%type <voidval> zero_adic_operator
-%type <voidval> parenthesised_expression
-%type <voidval> value
-%type <voidval> undefined_value
-%type <voidval> expression
-%type <voidval> conditional_expression
-%type <voidval> then_alternative
-%type <voidval> else_alternative
-%type <voidval> sub_expression
-%type <voidval> value_case_alternative
-%type <voidval> operand_0
-%type <voidval> operand_1
-%type <voidval> operand_2
-%type <voidval> operand_3
-%type <voidval> operand_4
-%type <voidval> operand_5
-%type <voidval> operand_6
-%type <voidval> integer_literal_expression
-%type <voidval> synonym_name
-%type <voidval> value_enumeration_name
-%type <voidval> value_do_with_name
-%type <voidval> value_receive_name
-%type <voidval> string_primitive_value
-%type <voidval> start_element
-%type <voidval> left_element
-%type <voidval> right_element
-%type <voidval> slice_size
-%type <voidval> array_primitive_value
-%type <voidval> expression_list
-%type <voidval> lower_element
-%type <voidval> upper_element
-%type <voidval> first_element
-%type <voidval> structure_primitive_value
-%type <voidval> field_name
-%type <voidval> mode_name
-%type <voidval> boolean_expression
-%type <voidval> case_selector_list
-%type <voidval> subexpression
-%type <voidval> case_label_specification
-%type <voidval> buffer_location
-
-%type <voidval> single_assignment_action
-
-%%
-
-/* Z.200, 5.3.1 */
-
-value : expression
- {
- $$ = 0; /* FIXME */
- }
- | undefined_value
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-undefined_value : FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 4.2.1 */
-
-location : access_name
- {
- $$ = 0; /* FIXME */
- }
- | FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 4.2.2 */
-
-access_name : LOCATION_NAME
- {
- write_exp_elt_opcode (OP_VAR_VALUE);
- write_exp_elt_sym ($1.sym);
- write_exp_elt_opcode (OP_VAR_VALUE);
- }
- | GDB_LAST /* gdb specific */
- {
- write_exp_elt_opcode (OP_LAST);
- write_exp_elt_longcst ($1);
- write_exp_elt_opcode (OP_LAST);
- }
- | GDB_REGNAME /* gdb specific */
- {
- write_exp_elt_opcode (OP_REGISTER);
- write_exp_elt_longcst ($1);
- write_exp_elt_opcode (OP_REGISTER);
- }
- | GDB_VARIABLE /* gdb specific */
- {
- write_exp_elt_opcode (OP_INTERNALVAR);
- write_exp_elt_intern ($1);
- write_exp_elt_opcode (OP_INTERNALVAR);
- }
- | FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 4.2.8 */
-
-expression_list : expression
- {
- arglist_len = 1;
- }
- | expression_list ',' expression
- {
- arglist_len++;
- }
-
-/* Z.200, 5.2.1 */
-
-primitive_value : location_contents
- {
- $$ = 0; /* FIXME */
- }
- | value_name
- {
- $$ = 0; /* FIXME */
- }
- | literal
- {
- $$ = 0; /* FIXME */
- }
- | tuple
- {
- $$ = 0; /* FIXME */
- }
- | value_string_element
- {
- $$ = 0; /* FIXME */
- }
- | value_string_slice
- {
- $$ = 0; /* FIXME */
- }
- | value_array_element
- {
- $$ = 0; /* FIXME */
- }
- | value_array_slice
- {
- $$ = 0; /* FIXME */
- }
- | value_structure_field
- {
- $$ = 0; /* FIXME */
- }
- | expression_conversion
- {
- $$ = 0; /* FIXME */
- }
- | value_procedure_call
- {
- $$ = 0; /* FIXME */
- }
- | value_built_in_routine_call
- {
- $$ = 0; /* FIXME */
- }
- | start_expression
- {
- $$ = 0; /* FIXME */
- }
- | zero_adic_operator
- {
- $$ = 0; /* FIXME */
- }
- | parenthesised_expression
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.2 */
-
-location_contents: location
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.3 */
-
-value_name : synonym_name
- {
- $$ = 0; /* FIXME */
- }
- | value_enumeration_name
- {
- $$ = 0; /* FIXME */
- }
- | value_do_with_name
- {
- $$ = 0; /* FIXME */
- }
- | value_receive_name
- {
- $$ = 0; /* FIXME */
- }
- | GENERAL_PROCEDURE_NAME
- {
- write_exp_elt_opcode (OP_VAR_VALUE);
- write_exp_elt_sym ($1.sym);
- write_exp_elt_opcode (OP_VAR_VALUE);
- }
- ;
-
-/* Z.200, 5.2.4.1 */
-
-literal : INTEGER_LITERAL
- {
- write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type ($1.type);
- write_exp_elt_longcst ((LONGEST) ($1.val));
- write_exp_elt_opcode (OP_LONG);
- }
- | BOOLEAN_LITERAL
- {
- write_exp_elt_opcode (OP_BOOL);
- write_exp_elt_longcst ((LONGEST) $1);
- write_exp_elt_opcode (OP_BOOL);
- }
- | CHARACTER_LITERAL
- {
- write_exp_elt_opcode (OP_LONG);
- write_exp_elt_type ($1.type);
- write_exp_elt_longcst ((LONGEST) ($1.val));
- write_exp_elt_opcode (OP_LONG);
- }
- | FLOAT_LITERAL
- {
- write_exp_elt_opcode (OP_DOUBLE);
- write_exp_elt_type (builtin_type_double);
- write_exp_elt_dblcst ($1);
- write_exp_elt_opcode (OP_DOUBLE);
- }
- | SET_LITERAL
- {
- $$ = 0; /* FIXME */
- }
- | EMPTINESS_LITERAL
- {
- $$ = 0; /* FIXME */
- }
- | CHARACTER_STRING_LITERAL
- {
- $$ = 0; /* FIXME */
- }
- | BIT_STRING_LITERAL
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.5 */
-
-tuple : FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-
-/* Z.200, 5.2.6 */
-
-value_string_element: string_primitive_value '(' start_element ')'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.7 */
-
-value_string_slice: string_primitive_value '(' left_element ':' right_element ')'
- {
- $$ = 0; /* FIXME */
- }
- | string_primitive_value '(' start_element UP slice_size ')'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.8 */
-
-value_array_element: array_primitive_value '('
- /* This is to save the value of arglist_len
- being accumulated for each dimension. */
- { start_arglist (); }
- expression_list ')'
- {
- write_exp_elt_opcode (MULTI_SUBSCRIPT);
- write_exp_elt_longcst ((LONGEST) end_arglist ());
- write_exp_elt_opcode (MULTI_SUBSCRIPT);
- }
- ;
-
-/* Z.200, 5.2.9 */
-
-value_array_slice: array_primitive_value '(' lower_element ':' upper_element ')'
- {
- $$ = 0; /* FIXME */
- }
- | array_primitive_value '(' first_element UP slice_size ')'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.10 */
-
-value_structure_field: structure_primitive_value '.' field_name
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.11 */
-
-expression_conversion: mode_name '(' expression ')'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.12 */
-
-value_procedure_call: FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.13 */
-
-value_built_in_routine_call: FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.14 */
-
-start_expression: FIXME
- {
- $$ = 0; /* FIXME */
- } /* Not in GNU-Chill */
- ;
-
-/* Z.200, 5.2.15 */
-
-zero_adic_operator: FIXME
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.2.16 */
-
-parenthesised_expression: '(' expression ')'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.2 */
-
-expression : operand_0
- {
- $$ = 0; /* FIXME */
- }
- | conditional_expression
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-conditional_expression : IF boolean_expression then_alternative else_alternative FI
- {
- $$ = 0; /* FIXME */
- }
- | CASE case_selector_list OF value_case_alternative '[' ELSE sub_expression ']' ESAC
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-then_alternative: THEN subexpression
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-else_alternative: ELSE subexpression
- {
- $$ = 0; /* FIXME */
- }
- | ELSIF boolean_expression then_alternative else_alternative
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-sub_expression : expression
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-value_case_alternative: case_label_specification ':' sub_expression ';'
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.3 */
-
-operand_0 : operand_1
- {
- $$ = 0; /* FIXME */
- }
- | operand_0 LOGIOR operand_1
- {
- write_exp_elt_opcode (BINOP_BITWISE_IOR);
- }
- | operand_0 ORIF operand_1
- {
- $$ = 0; /* FIXME */
- }
- | operand_0 LOGXOR operand_1
- {
- write_exp_elt_opcode (BINOP_BITWISE_XOR);
- }
- | single_assignment_action
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.4 */
-
-operand_1 : operand_2
- {
- $$ = 0; /* FIXME */
- }
- | operand_1 LOGAND operand_2
- {
- write_exp_elt_opcode (BINOP_BITWISE_AND);
- }
- | operand_1 ANDIF operand_2
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.5 */
-
-operand_2 : operand_3
- {
- $$ = 0; /* FIXME */
- }
- | operand_2 '=' operand_3
- {
- write_exp_elt_opcode (BINOP_EQUAL);
- }
- | operand_2 NOTEQUAL operand_3
- {
- write_exp_elt_opcode (BINOP_NOTEQUAL);
- }
- | operand_2 '>' operand_3
- {
- write_exp_elt_opcode (BINOP_GTR);
- }
- | operand_2 GTR operand_3
- {
- write_exp_elt_opcode (BINOP_GEQ);
- }
- | operand_2 '<' operand_3
- {
- write_exp_elt_opcode (BINOP_LESS);
- }
- | operand_2 LEQ operand_3
- {
- write_exp_elt_opcode (BINOP_LEQ);
- }
- | operand_2 IN operand_3
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-
-/* Z.200, 5.3.6 */
-
-operand_3 : operand_4
- {
- $$ = 0; /* FIXME */
- }
- | operand_3 '+' operand_4
- {
- write_exp_elt_opcode (BINOP_ADD);
- }
- | operand_3 '-' operand_4
- {
- write_exp_elt_opcode (BINOP_SUB);
- }
- | operand_3 SLASH_SLASH operand_4
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.7 */
-
-operand_4 : operand_5
- {
- $$ = 0; /* FIXME */
- }
- | operand_4 '*' operand_5
- {
- write_exp_elt_opcode (BINOP_MUL);
- }
- | operand_4 '/' operand_5
- {
- write_exp_elt_opcode (BINOP_DIV);
- }
- | operand_4 MOD operand_5
- {
- write_exp_elt_opcode (BINOP_MOD);
- }
- | operand_4 REM operand_5
- {
- write_exp_elt_opcode (BINOP_REM);
- }
- ;
-
-/* Z.200, 5.3.8 */
-
-operand_5 : operand_6
- {
- $$ = 0; /* FIXME */
- }
- | '-' operand_6
- {
- write_exp_elt_opcode (UNOP_NEG);
- }
- | NOT operand_6
- {
- write_exp_elt_opcode (UNOP_LOGICAL_NOT);
- }
- | '(' integer_literal_expression ')' operand_6
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-/* Z.200, 5.3.9 */
-
-operand_6 : POINTER location
- {
- $$ = 0; /* FIXME */
- }
- | RECEIVE buffer_location
- {
- $$ = 0; /* FIXME */
- }
- | primitive_value
- {
- $$ = 0; /* FIXME */
- }
- ;
-
-
-/* Z.200, 6.2 */
-
-single_assignment_action : location GDB_ASSIGNMENT value
- {
- write_exp_elt_opcode (BINOP_ASSIGN);
- }
-
-/* Z.200, 12.4.3 */
-/* FIXME: For now we just accept only a single integer literal. */
-
-integer_literal_expression:
- INTEGER_LITERAL
- {
- $$ = 0;
- }
-
-/* Z.200, 12.4.3 */
-
-array_primitive_value : primitive_value
- {
- $$ = 0;
- }
-
-
-/* Things which still need productions... */
-
-synonym_name : FIXME { $$ = 0; }
-value_enumeration_name : FIXME { $$ = 0; }
-value_do_with_name : FIXME { $$ = 0; }
-value_receive_name : FIXME { $$ = 0; }
-string_primitive_value : FIXME { $$ = 0; }
-start_element : FIXME { $$ = 0; }
-left_element : FIXME { $$ = 0; }
-right_element : FIXME { $$ = 0; }
-slice_size : FIXME { $$ = 0; }
-lower_element : FIXME { $$ = 0; }
-upper_element : FIXME { $$ = 0; }
-first_element : FIXME { $$ = 0; }
-structure_primitive_value: FIXME { $$ = 0; }
-field_name : FIXME { $$ = 0; }
-mode_name : FIXME { $$ = 0; }
-boolean_expression : FIXME { $$ = 0; }
-case_selector_list : FIXME { $$ = 0; }
-subexpression : FIXME { $$ = 0; }
-case_label_specification: FIXME { $$ = 0; }
-buffer_location : FIXME { $$ = 0; }
-
-%%
-
-/* Try to consume a simple name string token. If successful, returns
- a pointer to a nullbyte terminated copy of the name that can be used
- in symbol table lookups. If not successful, returns NULL. */
-
-static char *
-match_simple_name_string ()
-{
- char *tokptr = lexptr;
-
- if (isalpha (*tokptr))
- {
- do {
- tokptr++;
- } while (isalpha (*tokptr) || isdigit (*tokptr) || (*tokptr == '_'));
- yylval.sval.ptr = lexptr;
- yylval.sval.length = tokptr - lexptr;
- lexptr = tokptr;
- return (copy_name (yylval.sval));
- }
- return (NULL);
-}
-
-/* Start looking for a value composed of valid digits as set by the base
- in use. Note that '_' characters are valid anywhere, in any quantity,
- and are simply ignored. Since we must find at least one valid digit,
- or reject this token as an integer literal, we keep track of how many
- digits we have encountered. */
-
-static int
-decode_integer_value (base, tokptrptr, ivalptr)
- int base;
- char **tokptrptr;
- int *ivalptr;
-{
- char *tokptr = *tokptrptr;
- int temp;
- int digits = 0;
-
- while (*tokptr != '\0')
- {
- temp = tolower (*tokptr);
- tokptr++;
- switch (temp)
- {
- case '_':
- continue;
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- temp -= '0';
- break;
- case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
- temp -= 'a';
- temp += 10;
- break;
- default:
- temp = base;
- break;
- }
- if (temp < base)
- {
- digits++;
- *ivalptr *= base;
- *ivalptr += temp;
- }
- else
- {
- /* Found something not in domain for current base. */
- tokptr--; /* Unconsume what gave us indigestion. */
- break;
- }
- }
-
- /* If we didn't find any digits, then we don't have a valid integer
- value, so reject the entire token. Otherwise, update the lexical
- scan pointer, and return non-zero for success. */
-
- if (digits == 0)
- {
- return (0);
- }
- else
- {
- *tokptrptr = tokptr;
- return (1);
- }
-}
-
-static int
-decode_integer_literal (valptr, tokptrptr)
- int *valptr;
- char **tokptrptr;
-{
- char *tokptr = *tokptrptr;
- int base = 0;
- int ival = 0;
- int explicit_base = 0;
-
- /* Look for an explicit base specifier, which is optional. */
-
- switch (*tokptr)
- {
- case 'd':
- case 'D':
- explicit_base++;
- base = 10;
- tokptr++;
- break;
- case 'b':
- case 'B':
- explicit_base++;
- base = 2;
- tokptr++;
- break;
- case 'h':
- case 'H':
- explicit_base++;
- base = 16;
- tokptr++;
- break;
- case 'o':
- case 'O':
- explicit_base++;
- base = 8;
- tokptr++;
- break;
- default:
- base = 10;
- break;
- }
-
- /* If we found an explicit base ensure that the character after the
- explicit base is a single quote. */
-
- if (explicit_base && (*tokptr++ != '\''))
- {
- return (0);
- }
-
- /* Attempt to decode whatever follows as an integer value in the
- indicated base, updating the token pointer in the process and
- computing the value into ival. Also, if we have an explicit
- base, then the next character must not be a single quote, or we
- have a bitstring literal, so reject the entire token in this case.
- Otherwise, update the lexical scan pointer, and return non-zero
- for success. */
-
- if (!decode_integer_value (base, &tokptr, &ival))
- {
- return (0);
- }
- else if (explicit_base && (*tokptr == '\''))
- {
- return (0);
- }
- else
- {
- *valptr = ival;
- *tokptrptr = tokptr;
- return (1);
- }
-}
-
-/* If it wasn't for the fact that floating point values can contain '_'
- characters, we could just let strtod do all the hard work by letting it
- try to consume as much of the current token buffer as possible and
- find a legal conversion. Unfortunately we need to filter out the '_'
- characters before calling strtod, which we do by copying the other
- legal chars to a local buffer to be converted. However since we also
- need to keep track of where the last unconsumed character in the input
- buffer is, we have transfer only as many characters as may compose a
- legal floating point value. */
-
-static int
-match_float_literal ()
-{
- char *tokptr = lexptr;
- char *buf;
- char *copy;
- char ch;
- double dval;
- extern double strtod ();
-
- /* Make local buffer in which to build the string to convert. This is
- required because underscores are valid in chill floating point numbers
- but not in the string passed to strtod to convert. The string will be
- no longer than our input string. */
-
- copy = buf = (char *) alloca (strlen (tokptr) + 1);
-
- /* Transfer all leading digits to the conversion buffer, discarding any
- underscores. */
-
- while (isdigit (*tokptr) || *tokptr == '_')
- {
- if (*tokptr != '_')
- {
- *copy++ = *tokptr;
- }
- tokptr++;
- }
-
- /* Now accept either a '.', or one of [eEdD]. Dot is legal regardless
- of whether we found any leading digits, and we simply accept it and
- continue on to look for the fractional part and/or exponent. One of
- [eEdD] is legal only if we have seen digits, and means that there
- is no fractional part. If we find neither of these, then this is
- not a floating point number, so return failure. */
-
- switch (*tokptr++)
- {
- case '.':
- /* Accept and then look for fractional part and/or exponent. */
- *copy++ = '.';
- break;
-
- case 'e':
- case 'E':
- case 'd':
- case 'D':
- if (copy == buf)
- {
- return (0);
- }
- *copy++ = 'e';
- goto collect_exponent;
- break;
-
- default:
- return (0);
- break;
- }
-
- /* We found a '.', copy any fractional digits to the conversion buffer, up
- to the first nondigit, non-underscore character. */
-
- while (isdigit (*tokptr) || *tokptr == '_')
- {
- if (*tokptr != '_')
- {
- *copy++ = *tokptr;
- }
- tokptr++;
- }
-
- /* Look for an exponent, which must start with one of [eEdD]. If none
- is found, jump directly to trying to convert what we have collected
- so far. */
-
- switch (*tokptr)
- {
- case 'e':
- case 'E':
- case 'd':
- case 'D':
- *copy++ = 'e';
- tokptr++;
- break;
- default:
- goto convert_float;
- break;
- }
-
- /* Accept an optional '-' or '+' following one of [eEdD]. */
-
- collect_exponent:
- if (*tokptr == '+' || *tokptr == '-')
- {
- *copy++ = *tokptr++;
- }
-
- /* Now copy an exponent into the conversion buffer. Note that at the
- moment underscores are *not* allowed in exponents. */
-
- while (isdigit (*tokptr))
- {
- *copy++ = *tokptr++;
- }
-
- /* If we transfered any chars to the conversion buffer, try to interpret its
- contents as a floating point value. If any characters remain, then we
- must not have a valid floating point string. */
-
- convert_float:
- *copy = '\0';
- if (copy != buf)
- {
- dval = strtod (buf, ©);
- if (*copy == '\0')
- {
- yylval.dval = dval;
- lexptr = tokptr;
- return (FLOAT_LITERAL);
- }
- }
- return (0);
-}
-
-/* Recognize a character literal. A character literal is single character
- or a control sequence, enclosed in single quotes. A control sequence
- is a comma separated list of one or more integer literals, enclosed
- in parenthesis and introduced with a circumflex character.
-
- EX: 'a' '^(7)' '^(7,8)'
-
- As a GNU chill extension, the syntax C'xx' is also recognized as a
- character literal, where xx is a hex value for the character.
-
- Returns CHARACTER_LITERAL if a match is found.
- */
-
-static int
-match_character_literal ()
-{
- char *tokptr = lexptr;
- int ival = 0;
-
- if ((tolower (*tokptr) == 'c') && (*(tokptr + 1) == '\''))
- {
- /* We have a GNU chill extension form, so skip the leading "C'",
- decode the hex value, and then ensure that we have a trailing
- single quote character. */
- tokptr += 2;
- if (!decode_integer_value (16, &tokptr, &ival) || (*tokptr != '\''))
- {
- return (0);
- }
- tokptr++;
- }
- else if (*tokptr == '\'')
- {
- tokptr++;
-
- /* Determine which form we have, either a control sequence or the
- single character form. */
-
- if ((*tokptr == '^') && (*(tokptr + 1) == '('))
- {
- /* Match and decode a control sequence. Return zero if we don't
- find a valid integer literal, or if the next unconsumed character
- after the integer literal is not the trailing ')'.
- FIXME: We currently don't handle the multiple integer literal
- form. */
- tokptr += 2;
- if (!decode_integer_literal (&ival, &tokptr) || (*tokptr++ != ')'))
- {
- return (0);
- }
- }
- else
- {
- ival = *tokptr++;
- }
-
- /* The trailing quote has not yet been consumed. If we don't find
- it, then we have no match. */
-
- if (*tokptr++ != '\'')
- {
- return (0);
- }
- }
- else
- {
- /* Not a character literal. */
- return (0);
- }
- yylval.typed_val.val = ival;
- yylval.typed_val.type = builtin_type_chill_char;
- lexptr = tokptr;
- return (CHARACTER_LITERAL);
-}
-
-/* Recognize an integer literal, as specified in Z.200 sec 5.2.4.2.
- Note that according to 5.2.4.2, a single "_" is also a valid integer
- literal, however GNU-chill requires there to be at least one "digit"
- in any integer literal. */
-
-static int
-match_integer_literal ()
-{
- char *tokptr = lexptr;
- int ival;
-
- if (!decode_integer_literal (&ival, &tokptr))
- {
- return (0);
- }
- else
- {
- yylval.typed_val.val = ival;
- yylval.typed_val.type = builtin_type_int;
- lexptr = tokptr;
- return (INTEGER_LITERAL);
- }
-}
-
-/* Recognize tokens that start with '$'. These include:
-
- $regname A native register name or a "standard
- register name".
- Return token GDB_REGNAME.
-
- $variable A convenience variable with a name chosen
- by the user.
- Return token GDB_VARIABLE.
-
- $digits Value history with index <digits>, starting
- from the first value which has index 1.
- Return GDB_LAST.
-
- $$digits Value history with index <digits> relative
- to the last value. I.E. $$0 is the last
- value, $$1 is the one previous to that, $$2
- is the one previous to $$1, etc.
- Return token GDB_LAST.
-
- $ | $0 | $$0 The last value in the value history.
- Return token GDB_LAST.
-
- $$ An abbreviation for the second to the last
- value in the value history, I.E. $$1
- Return token GDB_LAST.
-
- Note that we currently assume that register names and convenience
- variables follow the convention of starting with a letter or '_'.
-
- */
-
-static int
-match_dollar_tokens ()
-{
- char *tokptr;
- int regno;
- int namelength;
- int negate;
- int ival;
-
- /* We will always have a successful match, even if it is just for
- a single '$', the abbreviation for $$0. So advance lexptr. */
-
- tokptr = ++lexptr;
-
- if (*tokptr == '_' || isalpha (*tokptr))
- {
- /* Look for a match with a native register name, usually something
- like "r0" for example. */
-
- for (regno = 0; regno < NUM_REGS; regno++)
- {
- namelength = strlen (reg_names[regno]);
- if (STREQN (tokptr, reg_names[regno], namelength)
- && !isalnum (tokptr[namelength]))
- {
- yylval.lval = regno;
- lexptr += namelength + 1;
- return (GDB_REGNAME);
- }
- }
-
- /* Look for a match with a standard register name, usually something
- like "pc", which gdb always recognizes as the program counter
- regardless of what the native register name is. */
-
- for (regno = 0; regno < num_std_regs; regno++)
- {
- namelength = strlen (std_regs[regno].name);
- if (STREQN (tokptr, std_regs[regno].name, namelength)
- && !isalnum (tokptr[namelength]))
- {
- yylval.lval = std_regs[regno].regnum;
- lexptr += namelength;
- return (GDB_REGNAME);
- }
- }
-
- /* Attempt to match against a convenience variable. Note that
- this will always succeed, because if no variable of that name
- already exists, the lookup_internalvar will create one for us.
- Also note that both lexptr and tokptr currently point to the
- start of the input string we are trying to match, and that we
- have already tested the first character for non-numeric, so we
- don't have to treat it specially. */
-
- while (*tokptr == '_' || isalnum (*tokptr))
- {
- tokptr++;
- }
- yylval.sval.ptr = lexptr;
- yylval.sval.length = tokptr - lexptr;
- yylval.ivar = lookup_internalvar (copy_name (yylval.sval));
- lexptr = tokptr;
- return (GDB_VARIABLE);
- }
-
- /* Since we didn't match against a register name or convenience
- variable, our only choice left is a history value. */
-
- if (*tokptr == '$')
- {
- negate = 1;
- ival = 1;
- tokptr++;
- }
- else
- {
- negate = 0;
- ival = 0;
- }
-
- /* Attempt to decode more characters as an integer value giving
- the index in the history list. If successful, the value will
- overwrite ival (currently 0 or 1), and if not, ival will be
- left alone, which is good since it is currently correct for
- the '$' or '$$' case. */
-
- decode_integer_literal (&ival, &tokptr);
- yylval.lval = negate ? -ival : ival;
- lexptr = tokptr;
- return (GDB_LAST);
-}
-
-struct token
-{
- char *operator;
- int token;
-};
-
-static const struct token tokentab5[] =
-{
- { "ANDIF", ANDIF }
-};
-
-static const struct token tokentab4[] =
-{
- { "ORIF", ORIF }
-};
-
-static const struct token tokentab3[] =
-{
- { "MOD", MOD },
- { "REM", REM },
- { "NOT", NOT },
- { "XOR", LOGXOR },
- { "AND", LOGAND }
-};
-
-static const struct token tokentab2[] =
-{
- { ":=", GDB_ASSIGNMENT },
- { "//", SLASH_SLASH },
- { "/=", NOTEQUAL },
- { "<=", LEQ },
- { ">=", GTR },
- { "IN", IN },
- { "OR", LOGIOR }
-};
-
-/* 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 ()
-{
- unsigned int i;
- int token;
- char *simplename;
- struct symbol *sym;
-
- /* Skip over any leading whitespace. */
- while (isspace (*lexptr))
- {
- lexptr++;
- }
- /* Look for special single character cases which can't be the first
- character of some other multicharacter token. */
- switch (*lexptr)
- {
- case '\0':
- return (0);
- case ',':
- case '=':
- case ';':
- case '!':
- case '+':
- case '-':
- case '*':
- case '/':
- case '(':
- case ')':
- case '[':
- case ']':
- return (*lexptr++);
- }
- /* Look for characters which start a particular kind of multicharacter
- token, such as a character literal, register name, convenience
- variable name, etc. */
- switch (*lexptr)
- {
- case 'C':
- case 'c':
- case '\'':
- token = match_character_literal ();
- if (token != 0)
- {
- return (token);
- }
- break;
- case '$':
- token = match_dollar_tokens ();
- if (token != 0)
- {
- return (token);
- }
- break;
- }
- /* See if it is a special token of length 5. */
- for (i = 0; i < sizeof (tokentab5) / sizeof (tokentab5[0]); i++)
- {
- if (STREQN (lexptr, tokentab5[i].operator, 5))
- {
- lexptr += 5;
- return (tokentab5[i].token);
- }
- }
- /* See if it is a special token of length 4. */
- for (i = 0; i < sizeof (tokentab4) / sizeof (tokentab4[0]); i++)
- {
- if (STREQN (lexptr, tokentab4[i].operator, 4))
- {
- lexptr += 4;
- return (tokentab4[i].token);
- }
- }
- /* See if it is a special token of length 3. */
- for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
- {
- if (STREQN (lexptr, tokentab3[i].operator, 3))
- {
- lexptr += 3;
- return (tokentab3[i].token);
- }
- }
- /* See if it is a special token of length 2. */
- for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
- {
- if (STREQN (lexptr, tokentab2[i].operator, 2))
- {
- lexptr += 2;
- return (tokentab2[i].token);
- }
- }
- /* Look for single character cases which which could be the first
- character of some other multicharacter token, but aren't, or we
- would already have found it. */
- switch (*lexptr)
- {
- case ':':
- case '/':
- case '<':
- case '>':
- return (*lexptr++);
- }
- /* Look for other special tokens. */
- if (STREQN (lexptr, "TRUE", 4)) /* FIXME: What about lowercase? */
- {
- yylval.ulval = 1;
- lexptr += 4;
- return (BOOLEAN_LITERAL);
- }
- if (STREQN (lexptr, "FALSE", 5)) /* FIXME: What about lowercase? */
- {
- yylval.ulval = 0;
- lexptr += 5;
- return (BOOLEAN_LITERAL);
- }
- /* Look for a float literal before looking for an integer literal, so
- we match as much of the input stream as possible. */
- token = match_float_literal ();
- if (token != 0)
- {
- return (token);
- }
- token = match_integer_literal ();
- if (token != 0)
- {
- return (token);
- }
-
- /* Try to match a simple name string, and if a match is found, then
- further classify what sort of name it is and return an appropriate
- token. Note that attempting to match a simple name string consumes
- the token from lexptr, so we can't back out if we later find that
- we can't classify what sort of name it is. */
-
- simplename = match_simple_name_string ();
- if (simplename != NULL)
- {
- sym = lookup_symbol (simplename, expression_context_block,
- VAR_NAMESPACE, (int *) NULL,
- (struct symtab **) NULL);
- if (sym != NULL)
- {
- yylval.ssym.stoken.ptr = NULL;
- yylval.ssym.stoken.length = 0;
- yylval.ssym.sym = sym;
- yylval.ssym.is_a_field_of_this = 0; /* FIXME, C++'ism */
- switch (SYMBOL_CLASS (sym))
- {
- case LOC_BLOCK:
- /* Found a procedure name. */
- return (GENERAL_PROCEDURE_NAME);
- case LOC_STATIC:
- /* Found a global or local static variable. */
- return (LOCATION_NAME);
- case LOC_REGISTER:
- case LOC_ARG:
- case LOC_REF_ARG:
- case LOC_REGPARM:
- case LOC_LOCAL:
- case LOC_LOCAL_ARG:
- if (innermost_block == NULL
- || contained_in (block_found, innermost_block))
- {
- innermost_block = block_found;
- }
- return (LOCATION_NAME);
- break;
- case LOC_CONST:
- case LOC_LABEL:
- return (LOCATION_NAME);
- break;
- case LOC_UNDEF:
- case LOC_TYPEDEF:
- case LOC_CONST_BYTES:
- error ("Symbol \"%s\" names no location.", simplename);
- break;
- }
- }
- else if (!have_full_symbols () && !have_partial_symbols ())
- {
- error ("No symbol table is loaded. Use the \"file\" command.");
- }
- else
- {
- error ("No symbol \"%s\" in current context.", simplename);
- }
- }
-
- /* Catch single character tokens which are not part of some
- longer token. */
-
- switch (*lexptr)
- {
- case '.': /* Not float for example. */
- return (*lexptr++);
- }
-
- return (ILLEGAL_TOKEN);
-}
-
-void
-yyerror (msg)
- char *msg; /* unused */
-{
- printf ("Parsing: %s\n", lexptr);
- if (yychar < 256)
- {
- error ("Invalid syntax in expression near character '%c'.", yychar);
- }
- else
- {
- error ("Invalid syntax in expression");
- }
-}
projects / deliverable / binutils-gdb.git / blobdiff