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binutils-gdb/gdb/m2-exp.y
Ulrich Weigand edd079d9f6 Target FP: Use target format throughout expression parsing 
When parsing floating-point literals, the language parsers currently
use parse_float or some equivalent routine to parse the input string
into a DOUBLEST, which is then stored within a OP_DOUBLE expression
node.  When evaluating the expression, the OP_DOUBLE is finally
converted into a value in target format.

On the other hand, *decimal* floating-point literals are parsed
directly into target format and stored that way in a OP_DECFLOAT
expression node.  In order to eliminate the DOUBLEST, this patch
therefore unifies the handling of binary and decimal floating-
point literals and stores them both in target format within a
new OP_FLOAT expression node, replacing both OP_DOUBLE and
OP_DECFLOAT.

In order to store literals in target format, the parse_float
routine needs to know the type of the literal.  All parsers
therefore need to be changed to determine the appropriate type
(e.g. by detecting suffixes) *before* calling parse_float,
instead of after it as today.  However, this change is mostly
straightforward -- again, this is already done for decimal FP
today.

The core of the literal parsing is moved into a new routine
floatformat_from_string, mirroring floatformat_to_string.
The parse_float routine now calls either floatformat_from_string
or decimal_from_sting, allowing it to handle any type of FP
literal.

All language parsers need to be updated.  Some notes on
specific changes to the various languages:

- C: Decimal FP is now handled in parse_float, and no longer
  needs to be handled specially.

- D: Straightforward.

- Fortran: Still used a hard-coded "atof", also replaced by
  parse_float now.  Continues to always use builtin_real_s8
  as the type of literal, even though this is probably wrong.

- Go: This used to handle "f" and "l" suffixes, even though
  the Go language actually doesn't support those.  I kept this
  support for now -- maybe revisit later.  Note the the GDB
  test suite for some reason actually *verifies* that GDB supports
  those unsupported suffixes ...

- Pascal: Likewise -- this handles suffixes that are not
  supported in the language standard.

- Modula-2: Like Fortran, used to use "atof".

- Rust: Mostly straightforward, except for a unit-testing hitch.
  The code use to set a special "unit_testing" flag which would
  cause "rust_type" to always return NULL.  This makes it not
  possible to encode a literal into target format (which type?).
  The reason for this flag appears to have been that during
  unit testing, there is no "rust_parser" context set up, which
  means no "gdbarch" is available to use its types.  To fix this,
  I removed the unit_testing flag, and instead simply just set up
  a dummy rust_parser context during unit testing.

- Ada: This used to check sizeof (DOUBLEST) to determine which
  type to use for floating-point literal.  This seems questionable
  to begin with (since DOUBLEST is quite unrelated to target formats),
  and in any case we need to get rid of DOUBLEST.  I'm now simply
  always using the largest type (builtin_long_double).

gdb/ChangeLog:
2017-10-25  Ulrich Weigand  <uweigand@de.ibm.com>

	* doublest.c (floatformat_from_string): New function.
	* doublest.h (floatformat_from_string): Add prototype.

	* std-operator.def (OP_DOUBLE, OP_DECFLOAT): Remove, replace by ...
	(OP_FLOAT): ... this.
	* expression.h: Do not include "doublest.h".
	(union exp_element): Replace doubleconst and decfloatconst by
	new element floatconst.
	* ada-lang.c (resolve_subexp): Handle OP_FLOAT instead of OP_DOUBLE.
	(ada_evaluate_subexp): Likewise.
	* eval.c (evaluate_subexp_standard): Handle OP_FLOAT instead of
	OP_DOUBLE and OP_DECFLOAT.
	* expprint.c (print_subexp_standard): Likewise.
	(dump_subexp_body_standard): Likewise.
	* breakpoint.c (watchpoint_exp_is_const): Likewise.

	* parse.c: Include "dfp.h".
	(write_exp_elt_dblcst, write_exp_elt_decfloatcst): Remove.
	(write_exp_elt_floatcst): New function.
	(operator_length_standard): Handle OP_FLOAT instead of OP_DOUBLE
	and OP_DECFLOAT.
	(operator_check_standard): Likewise.
	(parse_float): Do not accept suffix.  Take type as input.  Return bool.
	Return target format buffer instead of host DOUBLEST.
	Use floatformat_from_string and decimal_from_string to parse
	either binary or decimal floating-point types.
	(parse_c_float): Remove.
	* parser-defs.h: Do not include "doublest.h".
	(write_exp_elt_dblcst, write_exp_elt_decfloatcst): Remove.
	(write_exp_elt_floatcst): Add prototype.
	(parse_float): Update prototype.
	(parse_c_float): Remove.

	* c-exp.y: Do not include "dfp.h".
	(typed_val_float): Use byte buffer instead of DOUBLEST.
	(typed_val_decfloat): Remove.
	(DECFLOAT): Remove.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Update to new parse_float interface.
	Parse suffixes and determine type before calling parse_float.
	Handle decimal and binary FP types the same way.

	* d-exp.y (typed_val_float): Use byte buffer instead of DOUBLEST.
	(FLOAT_LITERAL): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Update to new parse_float interface.
	Parse suffixes and determine type before calling parse_float.

	* f-exp.y: Replace dval by typed_val_float.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Use parse_float instead of atof.

	* go-exp.y (typed_val_float): Use byte buffer instead of DOUBLEST.
	(parse_go_float): Remove.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Call parse_float instead of parse_go_float.
	Parse suffixes and determine type before calling parse_float.

	* p-exp.y (typed_val_float): Use byte buffer instead of DOUBLEST.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Update to new parse_float interface.
	Parse suffixes and determine type before calling parse_float.

	* m2-exp.y: Replace dval by byte buffer val.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	(parse_number): Call parse_float instead of atof.

	* rust-exp.y (typed_val_float): Use byte buffer instead of DOUBLEST.
	(lex_number): Call parse_float instead of strtod.
	(ast_dliteral): Use OP_FLOAT instead of OP_DOUBLE.
	(convert_ast_to_expression): Handle OP_FLOAT instead of OP_DOUBLE.
	Use write_exp_elt_floatcst.
	(unit_testing): Remove static variable.
	(rust_type): Do not check unit_testing.
	(rust_lex_tests): Do not set uint_testing.  Set up dummy rust_parser.

	* ada-exp.y (type_float, type_double): Remove.
	(typed_val_float): Use byte buffer instead of DOUBLEST.
	(FLOAT): Use OP_FLOAT and write_exp_elt_floatcst.
	* ada-lex.l (processReal): Use parse_float instead of sscanf.
2017-10-25 15:32:23 +02:00

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/* YACC grammar for Modula-2 expressions, for GDB.
Copyright (C) 1986-2017 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 3 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, see <http://www.gnu.org/licenses/>. */
/* 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 "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 */
#include "block.h"
#define parse_type(ps) builtin_type (parse_gdbarch (ps))
#define parse_m2_type(ps) builtin_m2_type (parse_gdbarch (ps))
/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
etc). */
#define GDB_YY_REMAP_PREFIX m2_
#include "yy-remap.h"
/* The state of the parser, used internally when we are parsing the
expression. */
static struct parser_state *pstate = NULL;
int yyparse (void);
static int yylex (void);
void yyerror (const char *);
static int parse_number (int);
/* The sign of the number being parsed. */
static int number_sign = 1;
%}
/* 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;
gdb_byte val[16];
struct symbol *sym;
struct type *tval;
struct stoken sval;
int voidval;
const 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 <val> 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 TSIZE
%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 (pstate, OP_TYPE);
write_exp_elt_type (pstate, $1);
write_exp_elt_opcode (pstate, OP_TYPE);
}
;
/* Expressions */
exp : exp '^' %prec UNARY
{ write_exp_elt_opcode (pstate, UNOP_IND); }
;
exp : '-'
{ number_sign = -1; }
exp %prec UNARY
{ number_sign = 1;
write_exp_elt_opcode (pstate, UNOP_NEG); }
;
exp : '+' exp %prec UNARY
{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
;
exp : not_exp exp %prec UNARY
{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
;
not_exp : NOT
| '~'
;
exp : CAP '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_CAP); }
;
exp : ORD '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_ORD); }
;
exp : ABS '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_ABS); }
;
exp : HIGH '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_HIGH); }
;
exp : MIN_FUNC '(' type ')'
{ write_exp_elt_opcode (pstate, UNOP_MIN);
write_exp_elt_type (pstate, $3);
write_exp_elt_opcode (pstate, UNOP_MIN); }
;
exp : MAX_FUNC '(' type ')'
{ write_exp_elt_opcode (pstate, UNOP_MAX);
write_exp_elt_type (pstate, $3);
write_exp_elt_opcode (pstate, UNOP_MAX); }
;
exp : FLOAT_FUNC '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_FLOAT); }
;
exp : VAL '(' type ',' exp ')'
{ write_exp_elt_opcode (pstate, BINOP_VAL);
write_exp_elt_type (pstate, $3);
write_exp_elt_opcode (pstate, BINOP_VAL); }
;
exp : CHR '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_CHR); }
;
exp : ODD '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_ODD); }
;
exp : TRUNC '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_TRUNC); }
;
exp : TSIZE '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
;
exp : SIZE exp %prec UNARY
{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
;
exp : INC '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
;
exp : INC '(' exp ',' exp ')'
{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
write_exp_elt_opcode (pstate, BINOP_ADD);
write_exp_elt_opcode (pstate,
BINOP_ASSIGN_MODIFY); }
;
exp : DEC '(' exp ')'
{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT);}
;
exp : DEC '(' exp ',' exp ')'
{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
write_exp_elt_opcode (pstate, BINOP_SUB);
write_exp_elt_opcode (pstate,
BINOP_ASSIGN_MODIFY); }
;
exp : exp DOT NAME
{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
write_exp_string (pstate, $3);
write_exp_elt_opcode (pstate, 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 (pstate, MULTI_SUBSCRIPT);
write_exp_elt_longcst (pstate,
(LONGEST) end_arglist());
write_exp_elt_opcode (pstate, MULTI_SUBSCRIPT); }
;
exp : exp '[' exp ']'
{ write_exp_elt_opcode (pstate, BINOP_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 (pstate, OP_FUNCALL);
write_exp_elt_longcst (pstate,
(LONGEST) end_arglist ());
write_exp_elt_opcode (pstate, 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 (pstate, UNOP_MEMVAL);
write_exp_elt_type (pstate, $2);
write_exp_elt_opcode (pstate, UNOP_MEMVAL); }
;
exp : type '(' exp ')' %prec UNARY
{ write_exp_elt_opcode (pstate, UNOP_CAST);
write_exp_elt_type (pstate, $1);
write_exp_elt_opcode (pstate, 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 (pstate, BINOP_REPEAT); }
;
exp : exp '*' exp
{ write_exp_elt_opcode (pstate, BINOP_MUL); }
;
exp : exp '/' exp
{ write_exp_elt_opcode (pstate, BINOP_DIV); }
;
exp : exp DIV exp
{ write_exp_elt_opcode (pstate, BINOP_INTDIV); }
;
exp : exp MOD exp
{ write_exp_elt_opcode (pstate, BINOP_REM); }
;
exp : exp '+' exp
{ write_exp_elt_opcode (pstate, BINOP_ADD); }
;
exp : exp '-' exp
{ write_exp_elt_opcode (pstate, BINOP_SUB); }
;
exp : exp '=' exp
{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
;
exp : exp NOTEQUAL exp
{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
| exp '#' exp
{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
;
exp : exp LEQ exp
{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
;
exp : exp GEQ exp
{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
;
exp : exp '<' exp
{ write_exp_elt_opcode (pstate, BINOP_LESS); }
;
exp : exp '>' exp
{ write_exp_elt_opcode (pstate, BINOP_GTR); }
;
exp : exp LOGICAL_AND exp
{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
;
exp : exp OROR exp
{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
;
exp : exp ASSIGN exp
{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
;
/* Constants */
exp : M2_TRUE
{ write_exp_elt_opcode (pstate, OP_BOOL);
write_exp_elt_longcst (pstate, (LONGEST) $1);
write_exp_elt_opcode (pstate, OP_BOOL); }
;
exp : M2_FALSE
{ write_exp_elt_opcode (pstate, OP_BOOL);
write_exp_elt_longcst (pstate, (LONGEST) $1);
write_exp_elt_opcode (pstate, OP_BOOL); }
;
exp : INT
{ write_exp_elt_opcode (pstate, OP_LONG);
write_exp_elt_type (pstate,
parse_m2_type (pstate)->builtin_int);
write_exp_elt_longcst (pstate, (LONGEST) $1);
write_exp_elt_opcode (pstate, OP_LONG); }
;
exp : UINT
{
write_exp_elt_opcode (pstate, OP_LONG);
write_exp_elt_type (pstate,
parse_m2_type (pstate)
->builtin_card);
write_exp_elt_longcst (pstate, (LONGEST) $1);
write_exp_elt_opcode (pstate, OP_LONG);
}
;
exp : CHAR
{ write_exp_elt_opcode (pstate, OP_LONG);
write_exp_elt_type (pstate,
parse_m2_type (pstate)
->builtin_char);
write_exp_elt_longcst (pstate, (LONGEST) $1);
write_exp_elt_opcode (pstate, OP_LONG); }
;
exp : FLOAT
{ write_exp_elt_opcode (pstate, OP_FLOAT);
write_exp_elt_type (pstate,
parse_m2_type (pstate)
->builtin_real);
write_exp_elt_floatcst (pstate, $1);
write_exp_elt_opcode (pstate, OP_FLOAT); }
;
exp : variable
;
exp : SIZE '(' type ')' %prec UNARY
{ write_exp_elt_opcode (pstate, OP_LONG);
write_exp_elt_type (pstate,
parse_type (pstate)->builtin_int);
write_exp_elt_longcst (pstate,
(LONGEST) TYPE_LENGTH ($3));
write_exp_elt_opcode (pstate, OP_LONG); }
;
exp : STRING
{ write_exp_elt_opcode (pstate, OP_M2_STRING);
write_exp_string (pstate, $1);
write_exp_elt_opcode (pstate, OP_M2_STRING); }
;
/* This will be used for extensions later. Like adding modules. */
block : fblock
{ $$ = SYMBOL_BLOCK_VALUE($1); }
;
fblock : BLOCKNAME
{ struct symbol *sym
= lookup_symbol (copy_name ($1),
expression_context_block,
VAR_DOMAIN, 0).symbol;
$$ = sym;}
;
/* GDB scope operator */
fblock : block COLONCOLON BLOCKNAME
{ struct symbol *tem
= lookup_symbol (copy_name ($3), $1,
VAR_DOMAIN, 0).symbol;
if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
error (_("No function \"%s\" in specified context."),
copy_name ($3));
$$ = tem;
}
;
/* Useful for assigning to PROCEDURE variables */
variable: fblock
{ write_exp_elt_opcode (pstate, OP_VAR_VALUE);
write_exp_elt_block (pstate, NULL);
write_exp_elt_sym (pstate, $1);
write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
;
/* GDB internal ($foo) variable */
variable: INTERNAL_VAR
;
/* GDB scope operator */
variable: block COLONCOLON NAME
{ struct block_symbol sym
= lookup_symbol (copy_name ($3), $1,
VAR_DOMAIN, 0);
if (sym.symbol == 0)
error (_("No symbol \"%s\" in specified context."),
copy_name ($3));
if (symbol_read_needs_frame (sym.symbol))
{
if (innermost_block == 0
|| contained_in (sym.block,
innermost_block))
innermost_block = sym.block;
}
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
write_exp_elt_block (pstate, sym.block);
write_exp_elt_sym (pstate, sym.symbol);
write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
;
/* Base case for variables. */
variable: NAME
{ struct block_symbol sym;
struct field_of_this_result is_a_field_of_this;
sym = lookup_symbol (copy_name ($1),
expression_context_block,
VAR_DOMAIN,
&is_a_field_of_this);
if (sym.symbol)
{
if (symbol_read_needs_frame (sym.symbol))
{
if (innermost_block == 0 ||
contained_in (sym.block,
innermost_block))
innermost_block = sym.block;
}
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
write_exp_elt_block (pstate, sym.block);
write_exp_elt_sym (pstate, sym.symbol);
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
}
else
{
struct bound_minimal_symbol msymbol;
char *arg = copy_name ($1);
msymbol =
lookup_bound_minimal_symbol (arg);
if (msymbol.minsym != NULL)
write_exp_msymbol (pstate, msymbol);
else if (!have_full_symbols () && !have_partial_symbols ())
error (_("No symbol table is loaded. Use the \"symbol-file\" command."));
else
error (_("No symbol \"%s\" in current context."),
copy_name ($1));
}
}
;
type
: TYPENAME
{ $$ = lookup_typename (parse_language (pstate),
parse_gdbarch (pstate),
copy_name ($1),
expression_context_block, 0); }
;
%%
/* 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 (int olen)
{
const char *p = lexptr;
LONGEST n = 0;
LONGEST prevn = 0;
int c,i,ischar=0;
int base = input_radix;
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. */
if (!parse_float (p, len,
parse_m2_type (pstate)->builtin_real,
yylval.val))
return ERROR;
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 },
{"TSIZE", SIZE },
};
/* 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 (void)
{
int c;
int namelen;
int i;
const char *tokstart;
char quote;
retry:
prev_lexptr = lexptr;
tokstart = lexptr;
/* See if it is a special token of length 2 */
for( i = 0 ; i < (int) (sizeof tokentab2 / sizeof tokentab2[0]) ; i++)
if (strncmp (tokentab2[i].name, tokstart, 2) == 0)
{
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;
const 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 == '$' || (c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
c = tokstart[++namelen])
;
/* The token "if" terminates the expression and is NOT
removed from the input stream. */
if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
{
return 0;
}
lexptr += namelen;
/* Lookup special keywords */
for(i = 0 ; i < (int) (sizeof(keytab) / sizeof(keytab[0])) ; i++)
if (namelen == strlen (keytab[i].keyw)
&& strncmp (tokstart, keytab[i].keyw, namelen) == 0)
return keytab[i].token;
yylval.sval.ptr = tokstart;
yylval.sval.length = namelen;
if (*tokstart == '$')
{
write_dollar_variable (pstate, 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_symtab (tmp))
return BLOCKNAME;
sym = lookup_symbol (tmp, expression_context_block, VAR_DOMAIN, 0).symbol;
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
return BLOCKNAME;
if (lookup_typename (parse_language (pstate), parse_gdbarch (pstate),
copy_name (yylval.sval),
expression_context_block, 1))
return TYPENAME;
if(sym)
{
switch(SYMBOL_CLASS (sym))
{
case LOC_STATIC:
case LOC_REGISTER:
case LOC_ARG:
case LOC_REF_ARG:
case LOC_REGPARM_ADDR:
case LOC_LOCAL:
case LOC_CONST:
case LOC_CONST_BYTES:
case LOC_OPTIMIZED_OUT:
case LOC_COMPUTED:
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()"));
default:
error (_("unhandled token in m2lex()"));
break;
}
}
else
{
/* Built-in BOOLEAN type. This is sort of a hack. */
if (strncmp (tokstart, "TRUE", 4) == 0)
{
yylval.ulval = 1;
return M2_TRUE;
}
else if (strncmp (tokstart, "FALSE", 5) == 0)
{
yylval.ulval = 0;
return M2_FALSE;
}
}
/* Must be another type of name... */
return NAME;
}
}
int
m2_parse (struct parser_state *par_state)
{
/* Setting up the parser state. */
scoped_restore pstate_restore = make_scoped_restore (&pstate);
gdb_assert (par_state != NULL);
pstate = par_state;
return yyparse ();
}
void
yyerror (const char *msg)
{
if (prev_lexptr)
lexptr = prev_lexptr;
error (_("A %s in expression, near `%s'."), (msg ? msg : "error"), lexptr);
}
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