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/* eval.h header file for eval.c
*
* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
* Julian Hall. All rights reserved. The software is
* redistributable under the licence given in the file "Licence"
* distributed in the NASM archive.
*/
#ifndef YASM_EVAL_H
#define YASM_EVAL_H
/*
* -------------------------
* Error reporting functions
* -------------------------
*/
/*
* An error reporting function should look like this.
*/
typedef void (*efunc) (void *private_data, int severity, const char *fmt, ...);
/*
* These are the error severity codes which get passed as the first
* argument to an efunc.
*/
#define ERR_DEBUG 0x00000008 /* put out debugging message */
#define ERR_WARNING 0x00000000 /* warn only: no further action */
#define ERR_NONFATAL 0x00000001 /* terminate assembly after phase */
#define ERR_FATAL 0x00000002 /* instantly fatal: exit with error */
#define ERR_PANIC 0x00000003 /* internal error: panic instantly
* and dump core for reference */
#define ERR_MASK 0x0000000F /* mask off the above codes */
#define ERR_NOFILE 0x00000010 /* don't give source file name/line */
#define ERR_USAGE 0x00000020 /* print a usage message */
#define ERR_PASS1 0x00000040 /* only print this error on pass one */
/*
* These codes define specific types of suppressible warning.
*/
#define ERR_WARN_MASK 0x0000FF00 /* the mask for this feature */
#define ERR_WARN_SHR 8 /* how far to shift right */
#define ERR_WARN_MNP 0x00000100 /* macro-num-parameters warning */
#define ERR_WARN_MSR 0x00000200 /* macro self-reference */
#define ERR_WARN_OL 0x00000300 /* orphan label (no colon, and
* alone on line) */
#define ERR_WARN_NOV 0x00000400 /* numeric overflow */
#define ERR_WARN_GNUELF 0x00000500 /* using GNU ELF extensions */
#define ERR_WARN_MAX 5 /* the highest numbered one */
/*
* The expression evaluator must be passed a scanner function; a
* standard scanner is provided as part of nasmlib.c. The
* preprocessor will use a different one. Scanners, and the
* token-value structures they return, look like this.
*
* The return value from the scanner is always a copy of the
* `t_type' field in the structure.
*/
struct tokenval {
int t_type;
yasm_intnum *t_integer, *t_inttwo;
char *t_charptr;
};
typedef int (*scanner) (void *private_data, struct tokenval *tv);
/*
* Token types returned by the scanner, in addition to ordinary
* ASCII character values, and zero for end-of-string.
*/
enum { /* token types, other than chars */
TOKEN_INVALID = -1, /* a placeholder value */
TOKEN_EOS = 0, /* end of string */
TOKEN_EQ = '=', TOKEN_GT = '>', TOKEN_LT = '<', /* aliases */
TOKEN_ID = 256, TOKEN_NUM, TOKEN_REG, TOKEN_INSN, /* major token types */
TOKEN_ERRNUM, /* numeric constant with error in */
TOKEN_HERE, TOKEN_BASE, /* $ and $$ */
TOKEN_SPECIAL, /* BYTE, WORD, DWORD, FAR, NEAR, etc */
TOKEN_PREFIX, /* A32, O16, LOCK, REPNZ, TIMES, etc */
TOKEN_SHL, TOKEN_SHR, /* << and >> */
TOKEN_SDIV, TOKEN_SMOD, /* // and %% */
TOKEN_GE, TOKEN_LE, TOKEN_NE, /* >=, <= and <> (!= is same as <>) */
TOKEN_DBL_AND, TOKEN_DBL_OR, TOKEN_DBL_XOR, /* &&, || and ^^ */
TOKEN_SEG, TOKEN_WRT, /* SEG and WRT */
TOKEN_FLOAT /* floating-point constant */
};
/*
* The actual expression evaluator function looks like this. When
* called, it expects the first token of its expression to already
* be in `*tv'; if it is not, set tv->t_type to TOKEN_INVALID and
* it will start by calling the scanner.
*
* `critical' is non-zero if the expression may not contain forward
* references. The evaluator will report its own error if this
* occurs; if `critical' is 1, the error will be "symbol not
* defined before use", whereas if `critical' is 2, the error will
* be "symbol undefined".
*
* If `critical' has bit 8 set (in addition to its main value: 0x101
* and 0x102 correspond to 1 and 2) then an extended expression
* syntax is recognised, in which relational operators such as =, <
* and >= are accepted, as well as low-precedence logical operators
* &&, ^^ and ||.
*/
#define CRITICAL 0x100
typedef yasm_expr *(*evalfunc) (scanner sc, void *scprivate, struct tokenval *tv,
int critical, efunc error, yasm_symtab *symtab);
/*
* The evaluator itself.
*/
yasm_expr *evaluate (scanner sc, void *scprivate, struct tokenval *tv,
void *eprivate, int critical, efunc report_error,
yasm_symtab *symtab);
#endif
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