1783 lines
41 KiB
Plaintext
1783 lines
41 KiB
Plaintext
/*-
|
||
* This code is derived from software copyrighted by the Free Software
|
||
* Foundation.
|
||
*
|
||
* Modified 1991 by Donn Seeley at UUNET Technologies, Inc.
|
||
* Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory.
|
||
*/
|
||
|
||
/* Parse C expressions for GDB.
|
||
Copyright (C) 1986, 1989 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
GDB 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 1, or (at your option)
|
||
any later version.
|
||
|
||
GDB 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 GDB; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
/* Parse a C 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. */
|
||
|
||
%{
|
||
#ifndef lint
|
||
static char sccsid[] = "@(#)expread.y 6.3 (Berkeley) 5/8/91";
|
||
#endif /* not lint */
|
||
|
||
#include <stdio.h>
|
||
#include "defs.h"
|
||
#include "param.h"
|
||
#include "symtab.h"
|
||
#include "frame.h"
|
||
#include "expression.h"
|
||
|
||
#include <a.out.h>
|
||
|
||
static struct expression *expout;
|
||
static int expout_size;
|
||
static int expout_ptr;
|
||
|
||
static int yylex ();
|
||
static void yyerror ();
|
||
static void write_exp_elt ();
|
||
static void write_exp_elt_opcode ();
|
||
static void write_exp_elt_sym ();
|
||
static void write_exp_elt_longcst ();
|
||
static void write_exp_elt_dblcst ();
|
||
static void write_exp_elt_type ();
|
||
static void write_exp_elt_intern ();
|
||
static void write_exp_string ();
|
||
static void start_arglist ();
|
||
static int end_arglist ();
|
||
static void free_funcalls ();
|
||
static char *copy_name ();
|
||
|
||
/* If this is nonzero, this block is used as the lexical context
|
||
for symbol names. */
|
||
|
||
static struct block *expression_context_block;
|
||
|
||
/* The innermost context required by the stack and register variables
|
||
we've encountered so far. */
|
||
struct block *innermost_block;
|
||
|
||
/* The block in which the most recently discovered symbol was found. */
|
||
struct block *block_found;
|
||
|
||
/* Number of arguments seen so far in innermost function call. */
|
||
static int arglist_len;
|
||
|
||
/* Data structure for saving values of arglist_len
|
||
for function calls whose arguments contain other function calls. */
|
||
|
||
struct funcall
|
||
{
|
||
struct funcall *next;
|
||
int arglist_len;
|
||
};
|
||
|
||
struct funcall *funcall_chain;
|
||
|
||
/* This kind of datum is used to represent the name
|
||
of a symbol token. */
|
||
|
||
struct stoken
|
||
{
|
||
char *ptr;
|
||
int length;
|
||
};
|
||
|
||
/* For parsing of complicated types.
|
||
An array should be preceded in the list by the size of the array. */
|
||
enum type_pieces
|
||
{tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
|
||
static enum type_pieces *type_stack;
|
||
static int type_stack_depth, type_stack_size;
|
||
|
||
static void push_type ();
|
||
static enum type_pieces pop_type ();
|
||
|
||
/* Allow debugging of parsing. */
|
||
#define YYDEBUG 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;
|
||
unsigned LONGEST ulval;
|
||
double 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 exp1 start variable
|
||
%type <tval> type typebase
|
||
%type <tvec> nonempty_typelist
|
||
%type <bval> block
|
||
|
||
/* Fancy type parsing. */
|
||
%type <voidval> func_mod direct_abs_decl abs_decl
|
||
%type <tval> ptype
|
||
%type <lval> array_mod
|
||
|
||
%token <lval> INT CHAR
|
||
%token <ulval> UINT
|
||
%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> NAME TYPENAME BLOCKNAME STRING
|
||
%type <sval> name name_not_typename typename
|
||
|
||
%token STRUCT UNION ENUM SIZEOF UNSIGNED COLONCOLON
|
||
|
||
/* Special type cases, put in to allow the parser to distinguish different
|
||
legal basetypes. */
|
||
%token SIGNED LONG SHORT INT_KEYWORD
|
||
|
||
%token <lval> LAST REGNAME
|
||
|
||
%token <ivar> VARIABLE
|
||
|
||
%token <opcode> ASSIGN_MODIFY
|
||
|
||
/* C++ */
|
||
%token THIS
|
||
|
||
%left ','
|
||
%left ABOVE_COMMA
|
||
%right '=' ASSIGN_MODIFY
|
||
%right '?'
|
||
%left OR
|
||
%left AND
|
||
%left '|'
|
||
%left '^'
|
||
%left '&'
|
||
%left EQUAL NOTEQUAL
|
||
%left '<' '>' LEQ GEQ
|
||
%left LSH RSH
|
||
%left '@'
|
||
%left '+' '-'
|
||
%left '*' '/' '%'
|
||
%right UNARY INCREMENT DECREMENT
|
||
%right ARROW '.' '[' '('
|
||
%left COLONCOLON
|
||
|
||
%%
|
||
|
||
start : exp1
|
||
;
|
||
|
||
/* Expressions, including the comma operator. */
|
||
exp1 : exp
|
||
| exp1 ',' exp
|
||
{ write_exp_elt_opcode (BINOP_COMMA); }
|
||
;
|
||
|
||
/* Expressions, not including the comma operator. */
|
||
exp : '*' exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_IND); }
|
||
|
||
exp : '&' exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_ADDR); }
|
||
|
||
exp : '-' exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_NEG); }
|
||
;
|
||
|
||
exp : '!' exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_ZEROP); }
|
||
;
|
||
|
||
exp : '~' exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_LOGNOT); }
|
||
;
|
||
|
||
exp : INCREMENT exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_PREINCREMENT); }
|
||
;
|
||
|
||
exp : DECREMENT exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_PREDECREMENT); }
|
||
;
|
||
|
||
exp : exp INCREMENT %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_POSTINCREMENT); }
|
||
;
|
||
|
||
exp : exp DECREMENT %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_POSTDECREMENT); }
|
||
;
|
||
|
||
exp : SIZEOF exp %prec UNARY
|
||
{ write_exp_elt_opcode (UNOP_SIZEOF); }
|
||
;
|
||
|
||
exp : exp ARROW name
|
||
{ write_exp_elt_opcode (STRUCTOP_PTR);
|
||
write_exp_string ($3);
|
||
write_exp_elt_opcode (STRUCTOP_PTR); }
|
||
;
|
||
|
||
exp : exp ARROW '*' exp
|
||
{ write_exp_elt_opcode (STRUCTOP_MPTR); }
|
||
;
|
||
|
||
exp : exp '.' name
|
||
{ write_exp_elt_opcode (STRUCTOP_STRUCT);
|
||
write_exp_string ($3);
|
||
write_exp_elt_opcode (STRUCTOP_STRUCT); }
|
||
;
|
||
|
||
exp : exp '.' '*' exp
|
||
{ write_exp_elt_opcode (STRUCTOP_MEMBER); }
|
||
;
|
||
|
||
exp : exp '[' exp1 ']'
|
||
{ write_exp_elt_opcode (BINOP_SUBSCRIPT); }
|
||
;
|
||
|
||
exp : exp '('
|
||
/* This is to save the value of arglist_len
|
||
being accumulated by an outer function call. */
|
||
{ start_arglist (); }
|
||
arglist ')' %prec ARROW
|
||
{ 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++; }
|
||
;
|
||
|
||
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 ($2);
|
||
write_exp_elt_opcode (UNOP_CAST); }
|
||
;
|
||
|
||
exp : '(' exp1 ')'
|
||
{ }
|
||
;
|
||
|
||
/* Binary operators in order of decreasing precedence. */
|
||
|
||
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 '%' 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 LSH exp
|
||
{ write_exp_elt_opcode (BINOP_LSH); }
|
||
;
|
||
|
||
exp : exp RSH exp
|
||
{ write_exp_elt_opcode (BINOP_RSH); }
|
||
;
|
||
|
||
exp : exp EQUAL exp
|
||
{ write_exp_elt_opcode (BINOP_EQUAL); }
|
||
;
|
||
|
||
exp : exp NOTEQUAL 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 '&' exp
|
||
{ write_exp_elt_opcode (BINOP_LOGAND); }
|
||
;
|
||
|
||
exp : exp '^' exp
|
||
{ write_exp_elt_opcode (BINOP_LOGXOR); }
|
||
;
|
||
|
||
exp : exp '|' exp
|
||
{ write_exp_elt_opcode (BINOP_LOGIOR); }
|
||
;
|
||
|
||
exp : exp AND exp
|
||
{ write_exp_elt_opcode (BINOP_AND); }
|
||
;
|
||
|
||
exp : exp OR exp
|
||
{ write_exp_elt_opcode (BINOP_OR); }
|
||
;
|
||
|
||
exp : exp '?' exp ':' exp %prec '?'
|
||
{ write_exp_elt_opcode (TERNOP_COND); }
|
||
;
|
||
|
||
exp : exp '=' exp
|
||
{ write_exp_elt_opcode (BINOP_ASSIGN); }
|
||
;
|
||
|
||
exp : exp ASSIGN_MODIFY exp
|
||
{ write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
|
||
write_exp_elt_opcode ($2);
|
||
write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
|
||
;
|
||
|
||
exp : INT
|
||
{ write_exp_elt_opcode (OP_LONG);
|
||
if ($1 == (int) $1 || $1 == (unsigned int) $1)
|
||
write_exp_elt_type (builtin_type_int);
|
||
else
|
||
write_exp_elt_type (BUILTIN_TYPE_LONGEST);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_LONG); }
|
||
;
|
||
|
||
exp : UINT
|
||
{
|
||
write_exp_elt_opcode (OP_LONG);
|
||
if ($1 == (unsigned int) $1)
|
||
write_exp_elt_type (builtin_type_unsigned_int);
|
||
else
|
||
write_exp_elt_type (BUILTIN_TYPE_UNSIGNED_LONGEST);
|
||
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_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_double);
|
||
write_exp_elt_dblcst ($1);
|
||
write_exp_elt_opcode (OP_DOUBLE); }
|
||
;
|
||
|
||
exp : variable
|
||
;
|
||
|
||
exp : LAST
|
||
{ write_exp_elt_opcode (OP_LAST);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_LAST); }
|
||
;
|
||
|
||
exp : REGNAME
|
||
{ write_exp_elt_opcode (OP_REGISTER);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_REGISTER); }
|
||
;
|
||
|
||
exp : VARIABLE
|
||
{ write_exp_elt_opcode (OP_INTERNALVAR);
|
||
write_exp_elt_intern ($1);
|
||
write_exp_elt_opcode (OP_INTERNALVAR); }
|
||
;
|
||
|
||
exp : SIZEOF '(' 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_STRING);
|
||
write_exp_string ($1);
|
||
write_exp_elt_opcode (OP_STRING); }
|
||
;
|
||
|
||
/* C++. */
|
||
exp : THIS
|
||
{ write_exp_elt_opcode (OP_THIS);
|
||
write_exp_elt_opcode (OP_THIS); }
|
||
;
|
||
|
||
/* end of C++. */
|
||
|
||
block : BLOCKNAME
|
||
{
|
||
struct symtab *tem = lookup_symtab (copy_name ($1));
|
||
struct symbol *sym;
|
||
|
||
if (tem)
|
||
$$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), 1);
|
||
else
|
||
{
|
||
sym = lookup_symbol (copy_name ($1),
|
||
expression_context_block,
|
||
VAR_NAMESPACE, 0);
|
||
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
|
||
$$ = SYMBOL_BLOCK_VALUE (sym);
|
||
else
|
||
error ("No file or function \"%s\".",
|
||
copy_name ($1));
|
||
}
|
||
}
|
||
;
|
||
|
||
block : block COLONCOLON name
|
||
{ struct symbol *tem
|
||
= lookup_symbol (copy_name ($3), $1, VAR_NAMESPACE, 0);
|
||
if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
|
||
error ("No function \"%s\" in specified context.",
|
||
copy_name ($3));
|
||
$$ = SYMBOL_BLOCK_VALUE (tem); }
|
||
;
|
||
|
||
variable: block COLONCOLON name
|
||
{ struct symbol *sym;
|
||
sym = lookup_symbol (copy_name ($3), $1, VAR_NAMESPACE, 0);
|
||
if (sym == 0)
|
||
error ("No symbol \"%s\" in specified context.",
|
||
copy_name ($3));
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
write_exp_elt_sym (sym);
|
||
write_exp_elt_opcode (OP_VAR_VALUE); }
|
||
;
|
||
|
||
variable: typebase COLONCOLON name
|
||
{
|
||
struct type *type = $1;
|
||
if (TYPE_CODE (type) != TYPE_CODE_STRUCT
|
||
&& TYPE_CODE (type) != TYPE_CODE_UNION)
|
||
error ("`%s' is not defined as an aggregate type.",
|
||
TYPE_NAME (type));
|
||
|
||
write_exp_elt_opcode (OP_SCOPE);
|
||
write_exp_elt_type (type);
|
||
write_exp_string ($3);
|
||
write_exp_elt_opcode (OP_SCOPE);
|
||
}
|
||
| COLONCOLON name
|
||
{
|
||
char *name = copy_name ($2);
|
||
struct symbol *sym;
|
||
int i;
|
||
|
||
sym = lookup_symbol (name, 0, VAR_NAMESPACE, 0);
|
||
if (sym)
|
||
{
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
write_exp_elt_sym (sym);
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
break;
|
||
}
|
||
for (i = 0; i < misc_function_count; i++)
|
||
if (!strcmp (misc_function_vector[i].name, name))
|
||
break;
|
||
|
||
if (i < misc_function_count)
|
||
{
|
||
enum misc_function_type mft =
|
||
(enum misc_function_type)
|
||
misc_function_vector[i].type;
|
||
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_type (builtin_type_int);
|
||
write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address);
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
if (mft == mf_data || mft == mf_bss)
|
||
write_exp_elt_type (builtin_type_int);
|
||
else if (mft == mf_text)
|
||
write_exp_elt_type (lookup_function_type (builtin_type_int));
|
||
else
|
||
write_exp_elt_type (builtin_type_char);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
}
|
||
else
|
||
if (symtab_list == 0
|
||
&& partial_symtab_list == 0)
|
||
error ("No symbol table is loaded. Use the \"symbol-file\" command.");
|
||
else
|
||
error ("No symbol \"%s\" in current context.", name);
|
||
}
|
||
;
|
||
|
||
variable: name_not_typename
|
||
{ 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);
|
||
if (sym)
|
||
{
|
||
switch (sym->class)
|
||
{
|
||
case LOC_REGISTER:
|
||
case LOC_ARG:
|
||
case LOC_LOCAL:
|
||
if (innermost_block == 0 ||
|
||
contained_in (block_found,
|
||
innermost_block))
|
||
innermost_block = block_found;
|
||
}
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
write_exp_elt_sym (sym);
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
}
|
||
else if (is_a_field_of_this)
|
||
{
|
||
/* C++: it hangs off of `this'. Must
|
||
not inadvertently convert from a method call
|
||
to data ref. */
|
||
if (innermost_block == 0 ||
|
||
contained_in (block_found, innermost_block))
|
||
innermost_block = block_found;
|
||
write_exp_elt_opcode (OP_THIS);
|
||
write_exp_elt_opcode (OP_THIS);
|
||
write_exp_elt_opcode (STRUCTOP_PTR);
|
||
write_exp_string ($1);
|
||
write_exp_elt_opcode (STRUCTOP_PTR);
|
||
}
|
||
else
|
||
{
|
||
register int i;
|
||
register char *arg = copy_name ($1);
|
||
|
||
for (i = 0; i < misc_function_count; i++)
|
||
if (!strcmp (misc_function_vector[i].name, arg))
|
||
break;
|
||
|
||
if (i < misc_function_count)
|
||
{
|
||
enum misc_function_type mft =
|
||
(enum misc_function_type)
|
||
misc_function_vector[i].type;
|
||
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_type (builtin_type_int);
|
||
write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address);
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
if (mft == mf_data || mft == mf_bss)
|
||
write_exp_elt_type (builtin_type_int);
|
||
else if (mft == mf_text)
|
||
write_exp_elt_type (lookup_function_type (builtin_type_int));
|
||
else
|
||
write_exp_elt_type (builtin_type_char);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
}
|
||
else if (symtab_list == 0
|
||
&& partial_symtab_list == 0)
|
||
error ("No symbol table is loaded. Use the \"symbol-file\" command.");
|
||
else
|
||
error ("No symbol \"%s\" in current context.",
|
||
copy_name ($1));
|
||
}
|
||
}
|
||
;
|
||
|
||
|
||
ptype : typebase
|
||
| typebase abs_decl
|
||
{
|
||
/* This is where the interesting stuff happens. */
|
||
int done = 0;
|
||
int array_size;
|
||
struct type *follow_type = $1;
|
||
|
||
while (!done)
|
||
switch (pop_type ())
|
||
{
|
||
case tp_end:
|
||
done = 1;
|
||
break;
|
||
case tp_pointer:
|
||
follow_type = lookup_pointer_type (follow_type);
|
||
break;
|
||
case tp_reference:
|
||
follow_type = lookup_reference_type (follow_type);
|
||
break;
|
||
case tp_array:
|
||
array_size = (int) pop_type ();
|
||
if (array_size != -1)
|
||
follow_type = create_array_type (follow_type,
|
||
array_size);
|
||
else
|
||
follow_type = lookup_pointer_type (follow_type);
|
||
break;
|
||
case tp_function:
|
||
follow_type = lookup_function_type (follow_type);
|
||
break;
|
||
}
|
||
$$ = follow_type;
|
||
}
|
||
;
|
||
|
||
abs_decl: '*'
|
||
{ push_type (tp_pointer); $$ = 0; }
|
||
| '*' abs_decl
|
||
{ push_type (tp_pointer); $$ = $2; }
|
||
| direct_abs_decl
|
||
;
|
||
|
||
direct_abs_decl: '(' abs_decl ')'
|
||
{ $$ = $2; }
|
||
| direct_abs_decl array_mod
|
||
{
|
||
push_type ((enum type_pieces) $2);
|
||
push_type (tp_array);
|
||
}
|
||
| array_mod
|
||
{
|
||
push_type ((enum type_pieces) $1);
|
||
push_type (tp_array);
|
||
$$ = 0;
|
||
}
|
||
| direct_abs_decl func_mod
|
||
{ push_type (tp_function); }
|
||
| func_mod
|
||
{ push_type (tp_function); }
|
||
;
|
||
|
||
array_mod: '[' ']'
|
||
{ $$ = -1; }
|
||
| '[' INT ']'
|
||
{ $$ = $2; }
|
||
;
|
||
|
||
func_mod: '(' ')'
|
||
{ $$ = 0; }
|
||
;
|
||
|
||
type : ptype
|
||
| typebase COLONCOLON '*'
|
||
{ $$ = lookup_member_type (builtin_type_int, $1); }
|
||
| type '(' typebase COLONCOLON '*' ')'
|
||
{ $$ = lookup_member_type ($1, $3); }
|
||
| type '(' typebase COLONCOLON '*' ')' '(' ')'
|
||
{ $$ = lookup_member_type
|
||
(lookup_function_type ($1), $3); }
|
||
| type '(' typebase COLONCOLON '*' ')' '(' nonempty_typelist ')'
|
||
{ $$ = lookup_member_type
|
||
(lookup_function_type ($1), $3);
|
||
free ($8); }
|
||
;
|
||
|
||
typebase
|
||
: TYPENAME
|
||
{ $$ = lookup_typename (copy_name ($1),
|
||
expression_context_block, 0); }
|
||
| INT_KEYWORD
|
||
{ $$ = builtin_type_int; }
|
||
| LONG
|
||
{ $$ = builtin_type_long; }
|
||
| SHORT
|
||
{ $$ = builtin_type_short; }
|
||
| LONG INT_KEYWORD
|
||
{ $$ = builtin_type_long; }
|
||
| UNSIGNED LONG INT_KEYWORD
|
||
{ $$ = builtin_type_unsigned_long; }
|
||
| SHORT INT_KEYWORD
|
||
{ $$ = builtin_type_short; }
|
||
| UNSIGNED SHORT INT_KEYWORD
|
||
{ $$ = builtin_type_unsigned_short; }
|
||
| STRUCT name
|
||
{ $$ = lookup_struct (copy_name ($2),
|
||
expression_context_block); }
|
||
| UNION name
|
||
{ $$ = lookup_union (copy_name ($2),
|
||
expression_context_block); }
|
||
| ENUM name
|
||
{ $$ = lookup_enum (copy_name ($2),
|
||
expression_context_block); }
|
||
| UNSIGNED typename
|
||
{ $$ = lookup_unsigned_typename (copy_name ($2)); }
|
||
| UNSIGNED
|
||
{ $$ = builtin_type_unsigned_int; }
|
||
| SIGNED typename
|
||
{ $$ = lookup_typename (copy_name ($2),
|
||
expression_context_block, 0); }
|
||
| SIGNED
|
||
{ $$ = builtin_type_int; }
|
||
;
|
||
|
||
typename: TYPENAME
|
||
| INT_KEYWORD
|
||
{
|
||
$$.ptr = "int";
|
||
$$.length = 3;
|
||
}
|
||
| LONG
|
||
{
|
||
$$.ptr = "long";
|
||
$$.length = 4;
|
||
}
|
||
| SHORT
|
||
{
|
||
$$.ptr = "short";
|
||
$$.length = 5;
|
||
}
|
||
;
|
||
|
||
nonempty_typelist
|
||
: type
|
||
{ $$ = (struct type **)xmalloc (sizeof (struct type *) * 2);
|
||
$$[0] = (struct type *)0;
|
||
$$[1] = $1;
|
||
}
|
||
| nonempty_typelist ',' type
|
||
{ int len = sizeof (struct type *) * ++($<ivec>1[0]);
|
||
$$ = (struct type **)xrealloc ($1, len);
|
||
$$[$<ivec>$[0]] = $3;
|
||
}
|
||
;
|
||
|
||
name : NAME
|
||
| BLOCKNAME
|
||
| TYPENAME
|
||
;
|
||
|
||
name_not_typename : NAME
|
||
| BLOCKNAME
|
||
;
|
||
|
||
%%
|
||
|
||
/* Begin counting arguments for a function call,
|
||
saving the data about any containing call. */
|
||
|
||
static void
|
||
start_arglist ()
|
||
{
|
||
register struct funcall *new = (struct funcall *) xmalloc (sizeof (struct funcall));
|
||
|
||
new->next = funcall_chain;
|
||
new->arglist_len = arglist_len;
|
||
arglist_len = 0;
|
||
funcall_chain = new;
|
||
}
|
||
|
||
/* Return the number of arguments in a function call just terminated,
|
||
and restore the data for the containing function call. */
|
||
|
||
static int
|
||
end_arglist ()
|
||
{
|
||
register int val = arglist_len;
|
||
register struct funcall *call = funcall_chain;
|
||
funcall_chain = call->next;
|
||
arglist_len = call->arglist_len;
|
||
free (call);
|
||
return val;
|
||
}
|
||
|
||
/* Free everything in the funcall chain.
|
||
Used when there is an error inside parsing. */
|
||
|
||
static void
|
||
free_funcalls ()
|
||
{
|
||
register struct funcall *call, *next;
|
||
|
||
for (call = funcall_chain; call; call = next)
|
||
{
|
||
next = call->next;
|
||
free (call);
|
||
}
|
||
}
|
||
|
||
/* This page contains the functions for adding data to the struct expression
|
||
being constructed. */
|
||
|
||
/* Add one element to the end of the expression. */
|
||
|
||
/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
|
||
a register through here */
|
||
|
||
static void
|
||
write_exp_elt (expelt)
|
||
union exp_element expelt;
|
||
{
|
||
if (expout_ptr >= expout_size)
|
||
{
|
||
expout_size *= 2;
|
||
expout = (struct expression *) xrealloc (expout,
|
||
sizeof (struct expression)
|
||
+ expout_size * sizeof (union exp_element));
|
||
}
|
||
expout->elts[expout_ptr++] = expelt;
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_opcode (expelt)
|
||
enum exp_opcode expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.opcode = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_sym (expelt)
|
||
struct symbol *expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.symbol = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_longcst (expelt)
|
||
LONGEST expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.longconst = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_dblcst (expelt)
|
||
double expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.doubleconst = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_type (expelt)
|
||
struct type *expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.type = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
static void
|
||
write_exp_elt_intern (expelt)
|
||
struct internalvar *expelt;
|
||
{
|
||
union exp_element tmp;
|
||
|
||
tmp.internalvar = expelt;
|
||
|
||
write_exp_elt (tmp);
|
||
}
|
||
|
||
/* Add a string constant to the end of the expression.
|
||
Follow it by its length in bytes, as a separate exp_element. */
|
||
|
||
static void
|
||
write_exp_string (str)
|
||
struct stoken str;
|
||
{
|
||
register int len = str.length;
|
||
register int lenelt
|
||
= (len + sizeof (union exp_element)) / sizeof (union exp_element);
|
||
|
||
expout_ptr += lenelt;
|
||
|
||
if (expout_ptr >= expout_size)
|
||
{
|
||
expout_size = max (expout_size * 2, expout_ptr + 10);
|
||
expout = (struct expression *)
|
||
xrealloc (expout, (sizeof (struct expression)
|
||
+ (expout_size * sizeof (union exp_element))));
|
||
}
|
||
bcopy (str.ptr, (char *) &expout->elts[expout_ptr - lenelt], len);
|
||
((char *) &expout->elts[expout_ptr - lenelt])[len] = 0;
|
||
write_exp_elt_longcst ((LONGEST) len);
|
||
}
|
||
|
||
/* During parsing of a C expression, the pointer to the next character
|
||
is in this variable. */
|
||
|
||
static char *lexptr;
|
||
|
||
/* Tokens that refer to names do so with explicit pointer and length,
|
||
so they can share the storage that lexptr is parsing.
|
||
|
||
When it is necessary to pass a name to a function that expects
|
||
a null-terminated string, the substring is copied out
|
||
into a block of storage that namecopy points to.
|
||
|
||
namecopy is allocated once, guaranteed big enough, for each parsing. */
|
||
|
||
static char *namecopy;
|
||
|
||
/* Current depth in parentheses within the expression. */
|
||
|
||
static int paren_depth;
|
||
|
||
/* Nonzero means stop parsing on first comma (if not within parentheses). */
|
||
|
||
static int comma_terminates;
|
||
|
||
/* 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 int c;
|
||
register int base = 10;
|
||
register int len = olen;
|
||
char *err_copy;
|
||
int unsigned_p = 0;
|
||
|
||
extern double atof ();
|
||
|
||
for (c = 0; c < len; c++)
|
||
if (p[c] == '.')
|
||
{
|
||
/* It's a float since it contains a point. */
|
||
yylval.dval = atof (p);
|
||
lexptr += len;
|
||
return FLOAT;
|
||
}
|
||
|
||
if (len >= 3 && (!strncmp (p, "0x", 2) || !strncmp (p, "0X", 2)))
|
||
{
|
||
p += 2;
|
||
base = 16;
|
||
len -= 2;
|
||
}
|
||
else if (*p == '0')
|
||
base = 8;
|
||
|
||
while (len-- > 0)
|
||
{
|
||
c = *p++;
|
||
if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
|
||
if (c != 'l' && c != 'u')
|
||
n *= base;
|
||
if (c >= '0' && c <= '9')
|
||
n += c - '0';
|
||
else
|
||
{
|
||
if (base == 16 && c >= 'a' && c <= 'f')
|
||
n += c - 'a' + 10;
|
||
else if (len == 0 && c == 'l')
|
||
;
|
||
else if (len == 0 && c == 'u')
|
||
unsigned_p = 1;
|
||
else if (base == 10 && len != 0 && (c == 'e' || c == 'E'))
|
||
{
|
||
/* Scientific notation, where we are unlucky enough not
|
||
to have a '.' in the string. */
|
||
yylval.dval = atof (lexptr);
|
||
lexptr += olen;
|
||
return FLOAT;
|
||
}
|
||
else
|
||
{
|
||
err_copy = (char *) alloca (olen + 1);
|
||
bcopy (lexptr, err_copy, olen);
|
||
err_copy[olen] = 0;
|
||
error ("Invalid number \"%s\".", err_copy);
|
||
}
|
||
}
|
||
}
|
||
|
||
lexptr = p;
|
||
if (unsigned_p)
|
||
{
|
||
yylval.ulval = n;
|
||
return UINT;
|
||
}
|
||
else
|
||
{
|
||
yylval.lval = n;
|
||
return INT;
|
||
}
|
||
}
|
||
|
||
struct token
|
||
{
|
||
char *operator;
|
||
int token;
|
||
enum exp_opcode opcode;
|
||
};
|
||
|
||
static struct token tokentab3[] =
|
||
{
|
||
{">>=", ASSIGN_MODIFY, BINOP_RSH},
|
||
{"<<=", ASSIGN_MODIFY, BINOP_LSH}
|
||
};
|
||
|
||
static struct token tokentab2[] =
|
||
{
|
||
{"+=", ASSIGN_MODIFY, BINOP_ADD},
|
||
{"-=", ASSIGN_MODIFY, BINOP_SUB},
|
||
{"*=", ASSIGN_MODIFY, BINOP_MUL},
|
||
{"/=", ASSIGN_MODIFY, BINOP_DIV},
|
||
{"%=", ASSIGN_MODIFY, BINOP_REM},
|
||
{"|=", ASSIGN_MODIFY, BINOP_LOGIOR},
|
||
{"&=", ASSIGN_MODIFY, BINOP_LOGAND},
|
||
{"^=", ASSIGN_MODIFY, BINOP_LOGXOR},
|
||
{"++", INCREMENT, BINOP_END},
|
||
{"--", DECREMENT, BINOP_END},
|
||
{"->", ARROW, BINOP_END},
|
||
{"&&", AND, BINOP_END},
|
||
{"||", OR, BINOP_END},
|
||
{"::", COLONCOLON, BINOP_END},
|
||
{"<<", LSH, BINOP_END},
|
||
{">>", RSH, BINOP_END},
|
||
{"==", EQUAL, BINOP_END},
|
||
{"!=", NOTEQUAL, BINOP_END},
|
||
{"<=", LEQ, BINOP_END},
|
||
{">=", GEQ, BINOP_END}
|
||
};
|
||
|
||
/* assign machine-independent names to certain registers
|
||
* (unless overridden by the REGISTER_NAMES table)
|
||
*/
|
||
struct std_regs {
|
||
char *name;
|
||
int regnum;
|
||
} std_regs[] = {
|
||
#ifdef PC_REGNUM
|
||
{ "pc", PC_REGNUM },
|
||
#endif
|
||
#ifdef FP_REGNUM
|
||
{ "fp", FP_REGNUM },
|
||
#endif
|
||
#ifdef SP_REGNUM
|
||
{ "sp", SP_REGNUM },
|
||
#endif
|
||
#ifdef PS_REGNUM
|
||
{ "ps", PS_REGNUM },
|
||
#endif
|
||
};
|
||
|
||
#define NUM_STD_REGS (sizeof std_regs / sizeof std_regs[0])
|
||
|
||
/* Read one token, getting characters through lexptr. */
|
||
|
||
static int
|
||
yylex ()
|
||
{
|
||
register int c;
|
||
register int namelen;
|
||
register int i;
|
||
register char *tokstart;
|
||
|
||
retry:
|
||
|
||
tokstart = lexptr;
|
||
/* See if it is a special token of length 3. */
|
||
for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
|
||
if (!strncmp (tokstart, tokentab3[i].operator, 3))
|
||
{
|
||
lexptr += 3;
|
||
yylval.opcode = tokentab3[i].opcode;
|
||
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 (!strncmp (tokstart, tokentab2[i].operator, 2))
|
||
{
|
||
lexptr += 2;
|
||
yylval.opcode = tokentab2[i].opcode;
|
||
return tokentab2[i].token;
|
||
}
|
||
|
||
switch (c = *tokstart)
|
||
{
|
||
case 0:
|
||
return 0;
|
||
|
||
case ' ':
|
||
case '\t':
|
||
case '\n':
|
||
lexptr++;
|
||
goto retry;
|
||
|
||
case '\'':
|
||
lexptr++;
|
||
c = *lexptr++;
|
||
if (c == '\\')
|
||
c = parse_escape (&lexptr);
|
||
yylval.lval = c;
|
||
c = *lexptr++;
|
||
if (c != '\'')
|
||
error ("Invalid character constant.");
|
||
return CHAR;
|
||
|
||
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. */
|
||
|
||
case '+':
|
||
case '-':
|
||
case '*':
|
||
case '/':
|
||
case '%':
|
||
case '|':
|
||
case '&':
|
||
case '^':
|
||
case '~':
|
||
case '!':
|
||
case '@':
|
||
case '<':
|
||
case '>':
|
||
case '[':
|
||
case ']':
|
||
case '?':
|
||
case ':':
|
||
case '=':
|
||
case '{':
|
||
case '}':
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '"':
|
||
for (namelen = 1; (c = tokstart[namelen]) != '"'; namelen++)
|
||
if (c == '\\')
|
||
{
|
||
c = tokstart[++namelen];
|
||
if (c >= '0' && c <= '9')
|
||
{
|
||
c = tokstart[++namelen];
|
||
if (c >= '0' && c <= '9')
|
||
c = tokstart[++namelen];
|
||
}
|
||
}
|
||
yylval.sval.ptr = tokstart + 1;
|
||
yylval.sval.length = namelen - 1;
|
||
lexptr += namelen + 1;
|
||
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') || c == '.')
|
||
{
|
||
/* It's a number. */
|
||
int got_dot = 0, got_e = 0;
|
||
register char *p = tokstart;
|
||
int hex = c == '0' && (p[1] == 'x' || p[1] == 'X');
|
||
if (hex)
|
||
p += 2;
|
||
for (;; ++p)
|
||
{
|
||
if (!hex && !got_e && (*p == 'e' || *p == 'E'))
|
||
got_dot = got_e = 1;
|
||
else if (!hex && !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 (!got_dot && !got_e && (*p=='l'||*p=='L')){
|
||
++p; break;
|
||
}
|
||
else if (!got_dot && !got_e && !hex && (*p=='u'||*p=='U')){
|
||
++p; break;
|
||
}
|
||
else if (*p < '0' || *p > '9'
|
||
&& (!hex || ((*p < 'a' || *p > 'f')
|
||
&& (*p < 'A' || *p > 'F'))))
|
||
break;
|
||
}
|
||
return parse_number (p - tokstart);
|
||
}
|
||
|
||
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;
|
||
|
||
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
|
||
and $$digits (equivalent to $<-digits> if you could type that).
|
||
Make token type LAST, and put the number (the digits) in yylval. */
|
||
|
||
if (*tokstart == '$')
|
||
{
|
||
register int negate = 0;
|
||
c = 1;
|
||
/* Double dollar means negate the number and add -1 as well.
|
||
Thus $$ alone means -1. */
|
||
if (namelen >= 2 && tokstart[1] == '$')
|
||
{
|
||
negate = 1;
|
||
c = 2;
|
||
}
|
||
if (c == namelen)
|
||
{
|
||
/* Just dollars (one or two) */
|
||
yylval.lval = - negate;
|
||
return LAST;
|
||
}
|
||
/* Is the rest of the token digits? */
|
||
for (; c < namelen; c++)
|
||
if (!(tokstart[c] >= '0' && tokstart[c] <= '9'))
|
||
break;
|
||
if (c == namelen)
|
||
{
|
||
yylval.lval = atoi (tokstart + 1 + negate);
|
||
if (negate)
|
||
yylval.lval = - yylval.lval;
|
||
return LAST;
|
||
}
|
||
}
|
||
|
||
/* Handle tokens that refer to machine registers:
|
||
$ followed by a register name. */
|
||
|
||
if (*tokstart == '$') {
|
||
for (c = 0; c < NUM_REGS; c++)
|
||
if (namelen - 1 == strlen (reg_names[c])
|
||
&& !strncmp (tokstart + 1, reg_names[c], namelen - 1))
|
||
{
|
||
yylval.lval = c;
|
||
return REGNAME;
|
||
}
|
||
for (c = 0; c < NUM_STD_REGS; c++)
|
||
if (namelen - 1 == strlen (std_regs[c].name)
|
||
&& !strncmp (tokstart + 1, std_regs[c].name, namelen - 1))
|
||
{
|
||
yylval.lval = std_regs[c].regnum;
|
||
return REGNAME;
|
||
}
|
||
}
|
||
/* Catch specific keywords. Should be done with a data structure. */
|
||
switch (namelen)
|
||
{
|
||
case 8:
|
||
if (!strncmp (tokstart, "unsigned", 8))
|
||
return UNSIGNED;
|
||
break;
|
||
case 6:
|
||
if (!strncmp (tokstart, "struct", 6))
|
||
return STRUCT;
|
||
if (!strncmp (tokstart, "signed", 6))
|
||
return SIGNED;
|
||
if (!strncmp (tokstart, "sizeof", 6))
|
||
return SIZEOF;
|
||
break;
|
||
case 5:
|
||
if (!strncmp (tokstart, "union", 5))
|
||
return UNION;
|
||
if (!strncmp (tokstart, "short", 5))
|
||
return SHORT;
|
||
break;
|
||
case 4:
|
||
if (!strncmp (tokstart, "enum", 4))
|
||
return ENUM;
|
||
if (!strncmp (tokstart, "long", 4))
|
||
return LONG;
|
||
if (!strncmp (tokstart, "this", 4)
|
||
&& lookup_symbol ("$this", expression_context_block,
|
||
VAR_NAMESPACE, 0))
|
||
return THIS;
|
||
break;
|
||
case 3:
|
||
if (!strncmp (tokstart, "int", 3))
|
||
return INT_KEYWORD;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
yylval.sval.ptr = tokstart;
|
||
yylval.sval.length = namelen;
|
||
|
||
/* Any other names starting in $ are debugger internal variables. */
|
||
|
||
if (*tokstart == '$')
|
||
{
|
||
yylval.ivar = (struct internalvar *) lookup_internalvar (copy_name (yylval.sval) + 1);
|
||
return VARIABLE;
|
||
}
|
||
|
||
/* Use token-type BLOCKNAME for symbols that happen to be defined as
|
||
functions or symtabs. 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);
|
||
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
|
||
return BLOCKNAME;
|
||
if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1))
|
||
return TYPENAME;
|
||
return NAME;
|
||
}
|
||
}
|
||
|
||
static void
|
||
yyerror ()
|
||
{
|
||
error ("Invalid syntax in expression.");
|
||
}
|
||
|
||
/* Return a null-terminated temporary copy of the name
|
||
of a string token. */
|
||
|
||
static char *
|
||
copy_name (token)
|
||
struct stoken token;
|
||
{
|
||
bcopy (token.ptr, namecopy, token.length);
|
||
namecopy[token.length] = 0;
|
||
return namecopy;
|
||
}
|
||
|
||
/* Reverse an expression from suffix form (in which it is constructed)
|
||
to prefix form (in which we can conveniently print or execute it). */
|
||
|
||
static void prefixify_subexp ();
|
||
|
||
static void
|
||
prefixify_expression (expr)
|
||
register struct expression *expr;
|
||
{
|
||
register int len = sizeof (struct expression) +
|
||
expr->nelts * sizeof (union exp_element);
|
||
register struct expression *temp;
|
||
register int inpos = expr->nelts, outpos = 0;
|
||
|
||
temp = (struct expression *) alloca (len);
|
||
|
||
/* Copy the original expression into temp. */
|
||
bcopy (expr, temp, len);
|
||
|
||
prefixify_subexp (temp, expr, inpos, outpos);
|
||
}
|
||
|
||
/* Return the number of exp_elements in the subexpression of EXPR
|
||
whose last exp_element is at index ENDPOS - 1 in EXPR. */
|
||
|
||
static int
|
||
length_of_subexp (expr, endpos)
|
||
register struct expression *expr;
|
||
register int endpos;
|
||
{
|
||
register int oplen = 1;
|
||
register int args = 0;
|
||
register int i;
|
||
|
||
if (endpos < 0)
|
||
error ("?error in length_of_subexp");
|
||
|
||
i = (int) expr->elts[endpos - 1].opcode;
|
||
|
||
switch (i)
|
||
{
|
||
/* C++ */
|
||
case OP_SCOPE:
|
||
oplen = 4 + ((expr->elts[endpos - 2].longconst
|
||
+ sizeof (union exp_element))
|
||
/ sizeof (union exp_element));
|
||
break;
|
||
|
||
case OP_LONG:
|
||
case OP_DOUBLE:
|
||
oplen = 4;
|
||
break;
|
||
|
||
case OP_VAR_VALUE:
|
||
case OP_LAST:
|
||
case OP_REGISTER:
|
||
case OP_INTERNALVAR:
|
||
oplen = 3;
|
||
break;
|
||
|
||
case OP_FUNCALL:
|
||
oplen = 3;
|
||
args = 1 + expr->elts[endpos - 2].longconst;
|
||
break;
|
||
|
||
case UNOP_CAST:
|
||
case UNOP_MEMVAL:
|
||
oplen = 3;
|
||
args = 1;
|
||
break;
|
||
|
||
case STRUCTOP_STRUCT:
|
||
case STRUCTOP_PTR:
|
||
args = 1;
|
||
case OP_STRING:
|
||
oplen = 3 + ((expr->elts[endpos - 2].longconst
|
||
+ sizeof (union exp_element))
|
||
/ sizeof (union exp_element));
|
||
break;
|
||
|
||
case TERNOP_COND:
|
||
args = 3;
|
||
break;
|
||
|
||
case BINOP_ASSIGN_MODIFY:
|
||
oplen = 3;
|
||
args = 2;
|
||
break;
|
||
|
||
/* C++ */
|
||
case OP_THIS:
|
||
oplen = 2;
|
||
break;
|
||
|
||
default:
|
||
args = 1 + (i < (int) BINOP_END);
|
||
}
|
||
|
||
while (args > 0)
|
||
{
|
||
oplen += length_of_subexp (expr, endpos - oplen);
|
||
args--;
|
||
}
|
||
|
||
return oplen;
|
||
}
|
||
|
||
/* Copy the subexpression ending just before index INEND in INEXPR
|
||
into OUTEXPR, starting at index OUTBEG.
|
||
In the process, convert it from suffix to prefix form. */
|
||
|
||
static void
|
||
prefixify_subexp (inexpr, outexpr, inend, outbeg)
|
||
register struct expression *inexpr;
|
||
struct expression *outexpr;
|
||
register int inend;
|
||
int outbeg;
|
||
{
|
||
register int oplen = 1;
|
||
register int args = 0;
|
||
register int i;
|
||
int *arglens;
|
||
enum exp_opcode opcode;
|
||
|
||
/* Compute how long the last operation is (in OPLEN),
|
||
and also how many preceding subexpressions serve as
|
||
arguments for it (in ARGS). */
|
||
|
||
opcode = inexpr->elts[inend - 1].opcode;
|
||
switch (opcode)
|
||
{
|
||
/* C++ */
|
||
case OP_SCOPE:
|
||
oplen = 4 + ((inexpr->elts[inend - 2].longconst
|
||
+ sizeof (union exp_element))
|
||
/ sizeof (union exp_element));
|
||
break;
|
||
|
||
case OP_LONG:
|
||
case OP_DOUBLE:
|
||
oplen = 4;
|
||
break;
|
||
|
||
case OP_VAR_VALUE:
|
||
case OP_LAST:
|
||
case OP_REGISTER:
|
||
case OP_INTERNALVAR:
|
||
oplen = 3;
|
||
break;
|
||
|
||
case OP_FUNCALL:
|
||
oplen = 3;
|
||
args = 1 + inexpr->elts[inend - 2].longconst;
|
||
break;
|
||
|
||
case UNOP_CAST:
|
||
case UNOP_MEMVAL:
|
||
oplen = 3;
|
||
args = 1;
|
||
break;
|
||
|
||
case STRUCTOP_STRUCT:
|
||
case STRUCTOP_PTR:
|
||
args = 1;
|
||
case OP_STRING:
|
||
oplen = 3 + ((inexpr->elts[inend - 2].longconst
|
||
+ sizeof (union exp_element))
|
||
/ sizeof (union exp_element));
|
||
|
||
break;
|
||
|
||
case TERNOP_COND:
|
||
args = 3;
|
||
break;
|
||
|
||
case BINOP_ASSIGN_MODIFY:
|
||
oplen = 3;
|
||
args = 2;
|
||
break;
|
||
|
||
/* C++ */
|
||
case OP_THIS:
|
||
oplen = 2;
|
||
break;
|
||
|
||
default:
|
||
args = 1 + ((int) opcode < (int) BINOP_END);
|
||
}
|
||
|
||
/* Copy the final operator itself, from the end of the input
|
||
to the beginning of the output. */
|
||
inend -= oplen;
|
||
bcopy (&inexpr->elts[inend], &outexpr->elts[outbeg],
|
||
oplen * sizeof (union exp_element));
|
||
outbeg += oplen;
|
||
|
||
/* Find the lengths of the arg subexpressions. */
|
||
arglens = (int *) alloca (args * sizeof (int));
|
||
for (i = args - 1; i >= 0; i--)
|
||
{
|
||
oplen = length_of_subexp (inexpr, inend);
|
||
arglens[i] = oplen;
|
||
inend -= oplen;
|
||
}
|
||
|
||
/* Now copy each subexpression, preserving the order of
|
||
the subexpressions, but prefixifying each one.
|
||
In this loop, inend starts at the beginning of
|
||
the expression this level is working on
|
||
and marches forward over the arguments.
|
||
outbeg does similarly in the output. */
|
||
for (i = 0; i < args; i++)
|
||
{
|
||
oplen = arglens[i];
|
||
inend += oplen;
|
||
prefixify_subexp (inexpr, outexpr, inend, outbeg);
|
||
outbeg += oplen;
|
||
}
|
||
}
|
||
|
||
/* This page contains the two entry points to this file. */
|
||
|
||
/* Read a C expression from the string *STRINGPTR points to,
|
||
parse it, and return a pointer to a struct expression that we malloc.
|
||
Use block BLOCK as the lexical context for variable names;
|
||
if BLOCK is zero, use the block of the selected stack frame.
|
||
Meanwhile, advance *STRINGPTR to point after the expression,
|
||
at the first nonwhite character that is not part of the expression
|
||
(possibly a null character).
|
||
|
||
If COMMA is nonzero, stop if a comma is reached. */
|
||
|
||
struct expression *
|
||
parse_c_1 (stringptr, block, comma)
|
||
char **stringptr;
|
||
struct block *block;
|
||
{
|
||
struct cleanup *old_chain;
|
||
|
||
lexptr = *stringptr;
|
||
|
||
paren_depth = 0;
|
||
type_stack_depth = 0;
|
||
|
||
comma_terminates = comma;
|
||
|
||
if (lexptr == 0 || *lexptr == 0)
|
||
error_no_arg ("expression to compute");
|
||
|
||
old_chain = make_cleanup (free_funcalls, 0);
|
||
funcall_chain = 0;
|
||
|
||
expression_context_block = block ? block : get_selected_block ();
|
||
|
||
namecopy = (char *) alloca (strlen (lexptr) + 1);
|
||
expout_size = 10;
|
||
expout_ptr = 0;
|
||
expout = (struct expression *)
|
||
xmalloc (sizeof (struct expression)
|
||
+ expout_size * sizeof (union exp_element));
|
||
make_cleanup (free_current_contents, &expout);
|
||
if (yyparse ())
|
||
yyerror ();
|
||
discard_cleanups (old_chain);
|
||
expout->nelts = expout_ptr;
|
||
expout = (struct expression *)
|
||
xrealloc (expout,
|
||
sizeof (struct expression)
|
||
+ expout_ptr * sizeof (union exp_element));
|
||
prefixify_expression (expout);
|
||
*stringptr = lexptr;
|
||
return expout;
|
||
}
|
||
|
||
/* Parse STRING as an expression, and complain if this fails
|
||
to use up all of the contents of STRING. */
|
||
|
||
struct expression *
|
||
parse_c_expression (string)
|
||
char *string;
|
||
{
|
||
register struct expression *exp;
|
||
exp = parse_c_1 (&string, 0, 0);
|
||
if (*string)
|
||
error ("Junk after end of expression.");
|
||
return exp;
|
||
}
|
||
|
||
static void
|
||
push_type (tp)
|
||
enum type_pieces tp;
|
||
{
|
||
if (type_stack_depth == type_stack_size)
|
||
{
|
||
type_stack_size *= 2;
|
||
type_stack = (enum type_pieces *)
|
||
xrealloc (type_stack, type_stack_size * sizeof (enum type_pieces));
|
||
}
|
||
type_stack[type_stack_depth++] = tp;
|
||
}
|
||
|
||
static enum type_pieces
|
||
pop_type ()
|
||
{
|
||
if (type_stack_depth)
|
||
return type_stack[--type_stack_depth];
|
||
return tp_end;
|
||
}
|
||
|
||
void
|
||
_initialize_expread ()
|
||
{
|
||
type_stack_size = 80;
|
||
type_stack_depth = 0;
|
||
type_stack = (enum type_pieces *)
|
||
xmalloc (type_stack_size * sizeof (enum type_pieces));
|
||
}
|