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yasm/libyasm/valparam.h

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/**
* \file libyasm/valparam.h
* \brief YASM value/parameter interface.
*
* \rcs
* $Id$
* \endrcs
*
* \license
* Copyright (C) 2001-2007 Peter Johnson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* \endlicense
*/
#ifndef YASM_VALPARAM_H
#define YASM_VALPARAM_H
/** Value/parameter pair. \internal */
struct yasm_valparam {
/*@reldef@*/ STAILQ_ENTRY(yasm_valparam) link; /**< Next pair in list */
/*@owned@*/ /*@null@*/ char *val; /**< Value */
/** Parameter type. */
enum yasm_param_type {
YASM_PARAM_ID, /**< Identifier */
YASM_PARAM_STRING, /**< String */
YASM_PARAM_EXPR /**< Expression */
} type; /**< Parameter type */
/** Parameter value. */
union yasm_param {
/*@owned@*/ char *id; /**< Identifier */
/*@owned@*/ char *str; /**< String */
/*@owned@*/ yasm_expr *e; /**< Expression */
} param; /**< Parameter */
/** Prefix character that indicates a raw identifier. When
* yasm_vp_string() is called on a #YASM_PARAM_ID, all characters are
* returned. When yasm_vp_id() is called on a #YASM_PARAM_ID, if the
* identifier begins with this character, this character is stripped
* from the returned value.
*/
char id_prefix;
};
/** Linked list of value/parameter pairs. \internal */
/*@reldef@*/ STAILQ_HEAD(yasm_valparamhead, yasm_valparam);
/** Directive list entry structure. */
struct yasm_directive {
/** Directive name. GAS directives should include the ".", NASM
* directives should just be the raw name (not including the []).
* NULL entry required to terminate list of directives.
*/
/*@null@*/ const char *name;
const char *parser; /**< Parser keyword */
/** Handler callback function for the directive.
* \param object object
* \param valparams value/parameters
* \param objext_valparams object format-specific value/parameters
* \param line virtual line (from yasm_linemap)
*/
void (*handler) (yasm_object *object, yasm_valparamhead *valparams,
yasm_valparamhead *objext_valparams, unsigned long line);
/** Flags for pre-handler parameter checking. */
enum yasm_directive_flags {
YASM_DIR_ANY = 0, /**< Any valparams accepted */
YASM_DIR_ARG_REQUIRED = 1, /**< Require at least 1 valparam */
YASM_DIR_ID_REQUIRED = 2 /**< First valparam must be ID */
} flags;
};
/** Call a directive. Performs any valparam checks asked for by the
* directive prior to call. Note that for a variety of reasons, a directive
* can generate an error.
* \param directive directive
* \param object object
* \param valparams value/parameters
* \param objext_valparams object format-specific value/parameters
* \param line virtual line (from yasm_linemap)
*/
void yasm_call_directive(const yasm_directive *directive, yasm_object *object,
yasm_valparamhead *valparams,
yasm_valparamhead *objext_valparams,
unsigned long line);
/** Create a new valparam with identifier parameter.
* \param v value
* \param p parameter
* \param id_prefix identifier prefix for raw identifiers
* \return Newly allocated valparam.
*/
yasm_valparam *yasm_vp_create_id(/*@keep@*/ char *v, /*@keep@*/ char *p,
int id_prefix);
/** Create a new valparam with string parameter.
* \param v value
* \param p parameter
* \return Newly allocated valparam.
*/
yasm_valparam *yasm_vp_create_string(/*@keep@*/ char *v, /*@keep@*/ char *p);
/** Create a new valparam with expression parameter.
* \param v value
* \param p parameter
* \return Newly allocated valparam.
*/
yasm_valparam *yasm_vp_create_expr(/*@keep@*/ char *v,
/*@keep@*/ yasm_expr *p);
/** Get a valparam parameter as an expr. If the parameter is an identifier,
* it's treated as a symbol (yasm_symtab_use() is called to convert it).
* \param vp valparam
* \param symtab symbol table
* \param line virtual line
* \return Expression, or NULL if vp is NULL or the parameter cannot be
* converted to an expression.
*/
/*@null@*/ /*@only@*/ yasm_expr *yasm_vp_expr
(const yasm_valparam *vp, yasm_symtab *symtab, unsigned long line);
/** Get a valparam parameter as a string. If the parameter is an identifier,
* it's treated as a string.
* \param vp valparam
* \return String, or NULL if vp is NULL or the parameter cannot be realized
* as a string.
*/
/*@null@*/ /*@dependent@*/ const char *yasm_vp_string(const yasm_valparam *vp);
/** Get a valparam parameter as an identifier.
* \param vp valparam
* \return Identifier (string), or NULL if vp is NULL or the parameter is not
* an identifier.
*/
/*@null@*/ /*@dependent@*/ const char *yasm_vp_id(const yasm_valparam *vp);
/** Create a new linked list of valparams.
* \return Newly allocated valparam list.
*/
yasm_valparamhead *yasm_vps_create(void);
/** Destroy a list of valparams (created with yasm_vps_create).
* \param headp list of valparams
*/
void yasm_vps_destroy(yasm_valparamhead *headp);
/** Initialize linked list of valparams.
* \param headp linked list
*/
void yasm_vps_initialize(/*@out@*/ yasm_valparamhead *headp);
#ifndef YASM_DOXYGEN
#define yasm_vps_initialize(headp) STAILQ_INIT(headp)
#endif
/** Destroy (free allocated memory for) linked list of valparams (created with
* yasm_vps_initialize).
* \warning Deletes val/params.
* \param headp linked list
*/
void yasm_vps_delete(yasm_valparamhead *headp);
/** Append valparam to tail of linked list.
* \param headp linked list
* \param vp valparam
*/
void yasm_vps_append(yasm_valparamhead *headp, /*@keep@*/ yasm_valparam *vp);
#ifndef YASM_DOXYGEN
#define yasm_vps_append(headp, vp) do { \
if (vp) \
STAILQ_INSERT_TAIL(headp, vp, link); \
} while(0)
#endif
/** Get first valparam in linked list.
* \param headp linked list
* \return First valparam in linked list.
*/
/*@null@*/ /*@dependent@*/ yasm_valparam *yasm_vps_first
(yasm_valparamhead *headp);
#ifndef YASM_DOXYGEN
#define yasm_vps_first(headp) STAILQ_FIRST(headp)
#endif
/** Get next valparam in linked list.
* \param cur previous valparam in linked list
* \return Next valparam in linked list.
*/
/*@null@*/ /*@dependent@*/ yasm_valparam *yasm_vps_next(yasm_valparam *cur);
#ifndef YASM_DOXYGEN
#define yasm_vps_next(cur) STAILQ_NEXT(cur, link)
#endif
/** Iterate through linked list of valparams.
* \internal
* \param iter iterator variable
* \param headp linked list
*/
#ifndef YASM_DOXYGEN
#define yasm_vps_foreach(iter, headp) STAILQ_FOREACH(iter, headp, link)
#endif
/** Print linked list of valparams. For debugging purposes.
* \param f file
* \param headp linked list
*/
void yasm_vps_print(/*@null@*/ const yasm_valparamhead *headp, FILE *f);
/** Directive valparam parse helper structure. */
typedef struct yasm_dir_help {
/** Value portion of val=param (if needsparam=1), or standalone identifier
* (if needsparam=0).
*/
const char *name;
/** 1 if value requires parameter, 0 if it must not have a parameter. */
int needsparam;
/** Helper callback function if name and parameter existence match.
* \param obj obj passed into yasm_dir_helper()
* \param vp value/parameter
* \param line line passed into yasm_dir_helper()
* \param data data passed into yasm_dir_helper() plus
#yasm_dir_help.off offset
* \param arg #yasm_dir_help.arg argument
* \return -1 on error, 0 otherwise.
*/
int (*helper) (void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Offset added to data pointer passed into yasm_dir_helper() before
* data pointer is given to #yasm_dir_help.helper(). This is so that
* a structure can be passed into yasm_dir_helper() and this can be an
* offsetof() to point the helper function to a specific structure
* member.
*/
size_t off;
/** Argument to pass in as the arg parameter to #yasm_dir_help.helper().
*/
uintptr_t arg;
} yasm_dir_help;
/** Help parse a list of directive value/parameters. Takes an array of
* #yasm_dir_help structures and tries to match val=param (or just val)
* against the passed value/parameters. When no match is found in the
* array of help structures, calls helper_valparam.
* \param obj object to be passed to yasm_dir_help.helper() or
* helper_valparam() callback
* \param vp_first first value/parameter to examine
* \param line virtual line number; passed down to helper callback
* \param help array of #yasm_dir_help structures
* \param nhelp number of array elements
* \param data base data pointer; if a match is found,
* the respective #yasm_dir_help.off is added to this
* prior to it being passed to the helper callback
* \param helper_valparam catch-all callback; should return -1 on error,
* 0 if not matched, 1 if matched.
* \return -1 on error, 1 if any arguments matched (including via
* catch-all callback), 0 if no match.
*/
int yasm_dir_helper(void *obj, yasm_valparam *vp_first, unsigned long line,
const yasm_dir_help *help, size_t nhelp, void *data,
int (*helper_valparam) (void *object,
yasm_valparam *vp,
unsigned long line,
void *data));
/** Standard helper for yasm_dir_helper() that simply sets a flag when called.
* It does not look at the vp; rather, it uses the value of the arg parameter,
* and stores an unsigned long value to data.
* \param obj unused
* \param vp unused
* \param line unused
* \param data pointer to an unsigned long
* \param arg flag to set
* \return 0
*/
int yasm_dir_helper_flag_set(void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Standard helper for yasm_dir_helper() that simply ORs a flag when called.
* It does not look at the vp; rather, it uses the value of the arg parameter,
* and ORs it with the unsigned long value in data.
* \param obj unused
* \param vp unused
* \param line unused
* \param data pointer to an unsigned long
* \param arg flag to OR
* \return 0
*/
int yasm_dir_helper_flag_or(void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Standard helper for yasm_dir_helper() that simply ANDs a flag when called.
* It does not look at the vp; rather, it uses the value of the arg parameter,
* and ANDs its inverse (~) with the unsigned long value in data.
* \param obj unused
* \param vp unused
* \param line unused
* \param data pointer to an unsigned long
* \param arg flag to AND
* \return 0
*/
int yasm_dir_helper_flag_and(void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Standard helper for yasm_dir_helper() that parses an intnum parameter.
* The #yasm_dir_help structure that uses this function should have
* needsparam=1. The obj parameter to yasm_dir_helper() when this helper
* is used MUST point to a #yasm_object. In addition, the data parameter
* that is ultimately passed to this function (e.g. yasm_dir_helper() data
* parameter plus #yasm_dir_help.off) must point to a #yasm_intnum *
* initialized to NULL.
* \param obj object; must be #yasm_object
* \param vp valparam
* \param line virtual line number
* \param data pointer to #yasm_intnum *
* \param arg unused argument
* \return -1 on error, 0 otherwise.
*/
int yasm_dir_helper_intn(void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Standard helper for yasm_dir_helper() that parses an string (or
* standalone identifier) parameter.
* The #yasm_dir_help structure that uses this function should have
* needsparam=1. The data parameter that is ultimately passed to this
* function (e.g. yasm_dir_helper() data parameter plus #yasm_dir_help.off)
* must point to a char * initialized to NULL.
* \param obj unused
* \param vp valparam
* \param line unused
* \param data pointer to char *
* \param arg unused
* \return -1 on error, 0 otherwise.
*/
int yasm_dir_helper_string(void *obj, yasm_valparam *vp, unsigned long line,
void *data, uintptr_t arg);
/** Standard catch-all callback fro yasm_dir_helper(). Generates standard
* warning for all valparams.
* \param obj unused
* \param vp valparam
* \param line unused
* \param data unused
* \return 0
*/
int yasm_dir_helper_valparam_warn(void *obj, yasm_valparam *vp,
unsigned long line, void *data);
#endif