mirror of
https://github.com/netwide-assembler/nasm.git
synced 2024-12-03 08:41:02 +08:00
cfbcddf1a5
No change on binary level Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
978 lines
27 KiB
C
978 lines
27 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2009 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* eval.c expression evaluator for the Netwide Assembler
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*/
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#include "compiler.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "nasm.h"
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#include "nasmlib.h"
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#include "eval.h"
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#include "labels.h"
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#include "float.h"
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#define TEMPEXPRS_DELTA 128
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#define TEMPEXPR_DELTA 8
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static scanner scan; /* Address of scanner routine */
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static efunc error; /* Address of error reporting routine */
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static lfunc labelfunc; /* Address of label routine */
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static struct ofmt *outfmt; /* Structure of addresses of output routines */
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static expr **tempexprs = NULL;
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static int ntempexprs;
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static int tempexprs_size = 0;
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static expr *tempexpr;
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static int ntempexpr;
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static int tempexpr_size;
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static struct tokenval *tokval; /* The current token */
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static int i; /* The t_type of tokval */
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static void *scpriv;
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static struct location *location; /* Pointer to current line's segment,offset */
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static int *opflags;
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static struct eval_hints *hint;
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extern int in_abs_seg; /* ABSOLUTE segment flag */
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extern int32_t abs_seg; /* ABSOLUTE segment */
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extern int32_t abs_offset; /* ABSOLUTE segment offset */
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/*
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* Unimportant cleanup is done to avoid confusing people who are trying
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* to debug real memory leaks
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*/
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void eval_cleanup(void)
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{
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while (ntempexprs)
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nasm_free(tempexprs[--ntempexprs]);
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nasm_free(tempexprs);
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}
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/*
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* Construct a temporary expression.
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*/
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static void begintemp(void)
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{
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tempexpr = NULL;
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tempexpr_size = ntempexpr = 0;
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}
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static void addtotemp(int32_t type, int64_t value)
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{
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while (ntempexpr >= tempexpr_size) {
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tempexpr_size += TEMPEXPR_DELTA;
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tempexpr = nasm_realloc(tempexpr,
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tempexpr_size * sizeof(*tempexpr));
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}
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tempexpr[ntempexpr].type = type;
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tempexpr[ntempexpr++].value = value;
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}
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static expr *finishtemp(void)
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{
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addtotemp(0L, 0L); /* terminate */
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while (ntempexprs >= tempexprs_size) {
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tempexprs_size += TEMPEXPRS_DELTA;
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tempexprs = nasm_realloc(tempexprs,
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tempexprs_size * sizeof(*tempexprs));
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}
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return tempexprs[ntempexprs++] = tempexpr;
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}
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/*
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* Add two vector datatypes. We have some bizarre behaviour on far-
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* absolute segment types: we preserve them during addition _only_
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* if one of the segments is a truly pure scalar.
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*/
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static expr *add_vectors(expr * p, expr * q)
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{
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int preserve;
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preserve = is_really_simple(p) || is_really_simple(q);
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begintemp();
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while (p->type && q->type &&
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p->type < EXPR_SEGBASE + SEG_ABS &&
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q->type < EXPR_SEGBASE + SEG_ABS) {
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int lasttype;
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if (p->type > q->type) {
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addtotemp(q->type, q->value);
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lasttype = q++->type;
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} else if (p->type < q->type) {
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addtotemp(p->type, p->value);
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lasttype = p++->type;
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} else { /* *p and *q have same type */
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int64_t sum = p->value + q->value;
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if (sum)
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addtotemp(p->type, sum);
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lasttype = p->type;
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p++, q++;
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}
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if (lasttype == EXPR_UNKNOWN) {
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return finishtemp();
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}
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}
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while (p->type && (preserve || p->type < EXPR_SEGBASE + SEG_ABS)) {
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addtotemp(p->type, p->value);
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p++;
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}
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while (q->type && (preserve || q->type < EXPR_SEGBASE + SEG_ABS)) {
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addtotemp(q->type, q->value);
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q++;
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}
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return finishtemp();
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}
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/*
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* Multiply a vector by a scalar. Strip far-absolute segment part
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* if present.
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*
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* Explicit treatment of UNKNOWN is not required in this routine,
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* since it will silently do the Right Thing anyway.
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*
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* If `affect_hints' is set, we also change the hint type to
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* NOTBASE if a MAKEBASE hint points at a register being
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* multiplied. This allows [eax*1+ebx] to hint EBX rather than EAX
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* as the base register.
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*/
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static expr *scalar_mult(expr * vect, int64_t scalar, int affect_hints)
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{
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expr *p = vect;
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while (p->type && p->type < EXPR_SEGBASE + SEG_ABS) {
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p->value = scalar * (p->value);
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if (hint && hint->type == EAH_MAKEBASE &&
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p->type == hint->base && affect_hints)
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hint->type = EAH_NOTBASE;
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p++;
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}
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p->type = 0;
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return vect;
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}
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static expr *scalarvect(int64_t scalar)
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{
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begintemp();
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addtotemp(EXPR_SIMPLE, scalar);
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return finishtemp();
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}
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static expr *unknown_expr(void)
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{
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begintemp();
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addtotemp(EXPR_UNKNOWN, 1L);
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return finishtemp();
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}
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/*
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* The SEG operator: calculate the segment part of a relocatable
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* value. Return NULL, as usual, if an error occurs. Report the
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* error too.
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*/
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static expr *segment_part(expr * e)
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{
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int32_t seg;
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if (is_unknown(e))
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return unknown_expr();
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if (!is_reloc(e)) {
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error(ERR_NONFATAL, "cannot apply SEG to a non-relocatable value");
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return NULL;
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}
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seg = reloc_seg(e);
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if (seg == NO_SEG) {
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error(ERR_NONFATAL, "cannot apply SEG to a non-relocatable value");
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return NULL;
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} else if (seg & SEG_ABS) {
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return scalarvect(seg & ~SEG_ABS);
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} else if (seg & 1) {
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error(ERR_NONFATAL, "SEG applied to something which"
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" is already a segment base");
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return NULL;
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} else {
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int32_t base = outfmt->segbase(seg + 1);
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begintemp();
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addtotemp((base == NO_SEG ? EXPR_UNKNOWN : EXPR_SEGBASE + base),
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1L);
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return finishtemp();
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}
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}
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/*
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* Recursive-descent parser. Called with a single boolean operand,
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* which is true if the evaluation is critical (i.e. unresolved
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* symbols are an error condition). Must update the global `i' to
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* reflect the token after the parsed string. May return NULL.
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*
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* evaluate() should report its own errors: on return it is assumed
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* that if NULL has been returned, the error has already been
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* reported.
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*/
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/*
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* Grammar parsed is:
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*
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* expr : bexpr [ WRT expr6 ]
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* bexpr : rexp0 or expr0 depending on relative-mode setting
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* rexp0 : rexp1 [ {||} rexp1...]
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* rexp1 : rexp2 [ {^^} rexp2...]
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* rexp2 : rexp3 [ {&&} rexp3...]
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* rexp3 : expr0 [ {=,==,<>,!=,<,>,<=,>=} expr0 ]
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* expr0 : expr1 [ {|} expr1...]
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* expr1 : expr2 [ {^} expr2...]
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* expr2 : expr3 [ {&} expr3...]
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* expr3 : expr4 [ {<<,>>} expr4...]
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* expr4 : expr5 [ {+,-} expr5...]
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* expr5 : expr6 [ {*,/,%,//,%%} expr6...]
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* expr6 : { ~,+,-,SEG } expr6
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* | (bexpr)
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* | symbol
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* | $
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* | number
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*/
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static expr *rexp0(int), *rexp1(int), *rexp2(int), *rexp3(int);
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static expr *expr0(int), *expr1(int), *expr2(int), *expr3(int);
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static expr *expr4(int), *expr5(int), *expr6(int);
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static expr *(*bexpr) (int);
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static expr *rexp0(int critical)
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{
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expr *e, *f;
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e = rexp1(critical);
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if (!e)
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return NULL;
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while (i == TOKEN_DBL_OR) {
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i = scan(scpriv, tokval);
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f = rexp1(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`|' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect((int64_t)(reloc_value(e) || reloc_value(f)));
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}
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return e;
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}
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static expr *rexp1(int critical)
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{
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expr *e, *f;
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e = rexp2(critical);
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if (!e)
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return NULL;
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while (i == TOKEN_DBL_XOR) {
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i = scan(scpriv, tokval);
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f = rexp2(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`^' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect((int64_t)(!reloc_value(e) ^ !reloc_value(f)));
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}
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return e;
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}
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static expr *rexp2(int critical)
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{
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expr *e, *f;
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e = rexp3(critical);
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if (!e)
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return NULL;
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while (i == TOKEN_DBL_AND) {
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i = scan(scpriv, tokval);
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f = rexp3(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`&' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect((int64_t)(reloc_value(e) && reloc_value(f)));
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}
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return e;
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}
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static expr *rexp3(int critical)
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{
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expr *e, *f;
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int64_t v;
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e = expr0(critical);
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if (!e)
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return NULL;
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while (i == TOKEN_EQ || i == TOKEN_LT || i == TOKEN_GT ||
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i == TOKEN_NE || i == TOKEN_LE || i == TOKEN_GE) {
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int j = i;
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i = scan(scpriv, tokval);
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f = expr0(critical);
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if (!f)
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return NULL;
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e = add_vectors(e, scalar_mult(f, -1L, false));
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switch (j) {
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case TOKEN_EQ:
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case TOKEN_NE:
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if (is_unknown(e))
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v = -1; /* means unknown */
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else if (!is_really_simple(e) || reloc_value(e) != 0)
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v = (j == TOKEN_NE); /* unequal, so return true if NE */
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else
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v = (j == TOKEN_EQ); /* equal, so return true if EQ */
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break;
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default:
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if (is_unknown(e))
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v = -1; /* means unknown */
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else if (!is_really_simple(e)) {
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error(ERR_NONFATAL,
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"`%s': operands differ by a non-scalar",
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(j == TOKEN_LE ? "<=" : j == TOKEN_LT ? "<" : j ==
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TOKEN_GE ? ">=" : ">"));
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v = 0; /* must set it to _something_ */
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} else {
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int vv = reloc_value(e);
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if (vv == 0)
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v = (j == TOKEN_LE || j == TOKEN_GE);
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else if (vv > 0)
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v = (j == TOKEN_GE || j == TOKEN_GT);
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else /* vv < 0 */
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v = (j == TOKEN_LE || j == TOKEN_LT);
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}
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break;
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}
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if (v == -1)
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e = unknown_expr();
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else
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e = scalarvect(v);
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}
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return e;
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}
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static expr *expr0(int critical)
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{
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expr *e, *f;
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e = expr1(critical);
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if (!e)
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return NULL;
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while (i == '|') {
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i = scan(scpriv, tokval);
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f = expr1(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`|' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect(reloc_value(e) | reloc_value(f));
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}
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return e;
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}
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static expr *expr1(int critical)
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{
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expr *e, *f;
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e = expr2(critical);
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if (!e)
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return NULL;
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while (i == '^') {
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i = scan(scpriv, tokval);
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f = expr2(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`^' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect(reloc_value(e) ^ reloc_value(f));
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}
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return e;
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}
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static expr *expr2(int critical)
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{
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expr *e, *f;
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e = expr3(critical);
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if (!e)
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return NULL;
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while (i == '&') {
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i = scan(scpriv, tokval);
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f = expr3(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "`&' operator may only be applied to"
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" scalar values");
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}
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if (is_just_unknown(e) || is_just_unknown(f))
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e = unknown_expr();
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else
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e = scalarvect(reloc_value(e) & reloc_value(f));
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}
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return e;
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}
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static expr *expr3(int critical)
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{
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expr *e, *f;
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e = expr4(critical);
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if (!e)
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return NULL;
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while (i == TOKEN_SHL || i == TOKEN_SHR) {
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int j = i;
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i = scan(scpriv, tokval);
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f = expr4(critical);
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if (!f)
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return NULL;
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if (!(is_simple(e) || is_just_unknown(e)) ||
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!(is_simple(f) || is_just_unknown(f))) {
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error(ERR_NONFATAL, "shift operator may only be applied to"
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" scalar values");
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} else if (is_just_unknown(e) || is_just_unknown(f)) {
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e = unknown_expr();
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} else
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switch (j) {
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case TOKEN_SHL:
|
|
e = scalarvect(reloc_value(e) << reloc_value(f));
|
|
break;
|
|
case TOKEN_SHR:
|
|
e = scalarvect(((uint64_t)reloc_value(e)) >>
|
|
reloc_value(f));
|
|
break;
|
|
}
|
|
}
|
|
return e;
|
|
}
|
|
|
|
static expr *expr4(int critical)
|
|
{
|
|
expr *e, *f;
|
|
|
|
e = expr5(critical);
|
|
if (!e)
|
|
return NULL;
|
|
while (i == '+' || i == '-') {
|
|
int j = i;
|
|
i = scan(scpriv, tokval);
|
|
f = expr5(critical);
|
|
if (!f)
|
|
return NULL;
|
|
switch (j) {
|
|
case '+':
|
|
e = add_vectors(e, f);
|
|
break;
|
|
case '-':
|
|
e = add_vectors(e, scalar_mult(f, -1L, false));
|
|
break;
|
|
}
|
|
}
|
|
return e;
|
|
}
|
|
|
|
static expr *expr5(int critical)
|
|
{
|
|
expr *e, *f;
|
|
|
|
e = expr6(critical);
|
|
if (!e)
|
|
return NULL;
|
|
while (i == '*' || i == '/' || i == '%' ||
|
|
i == TOKEN_SDIV || i == TOKEN_SMOD) {
|
|
int j = i;
|
|
i = scan(scpriv, tokval);
|
|
f = expr6(critical);
|
|
if (!f)
|
|
return NULL;
|
|
if (j != '*' && (!(is_simple(e) || is_just_unknown(e)) ||
|
|
!(is_simple(f) || is_just_unknown(f)))) {
|
|
error(ERR_NONFATAL, "division operator may only be applied to"
|
|
" scalar values");
|
|
return NULL;
|
|
}
|
|
if (j != '*' && !is_unknown(f) && reloc_value(f) == 0) {
|
|
error(ERR_NONFATAL, "division by zero");
|
|
return NULL;
|
|
}
|
|
switch (j) {
|
|
case '*':
|
|
if (is_simple(e))
|
|
e = scalar_mult(f, reloc_value(e), true);
|
|
else if (is_simple(f))
|
|
e = scalar_mult(e, reloc_value(f), true);
|
|
else if (is_just_unknown(e) && is_just_unknown(f))
|
|
e = unknown_expr();
|
|
else {
|
|
error(ERR_NONFATAL, "unable to multiply two "
|
|
"non-scalar objects");
|
|
return NULL;
|
|
}
|
|
break;
|
|
case '/':
|
|
if (is_just_unknown(e) || is_just_unknown(f))
|
|
e = unknown_expr();
|
|
else
|
|
e = scalarvect(((uint64_t)reloc_value(e)) /
|
|
((uint64_t)reloc_value(f)));
|
|
break;
|
|
case '%':
|
|
if (is_just_unknown(e) || is_just_unknown(f))
|
|
e = unknown_expr();
|
|
else
|
|
e = scalarvect(((uint64_t)reloc_value(e)) %
|
|
((uint64_t)reloc_value(f)));
|
|
break;
|
|
case TOKEN_SDIV:
|
|
if (is_just_unknown(e) || is_just_unknown(f))
|
|
e = unknown_expr();
|
|
else
|
|
e = scalarvect(((int64_t)reloc_value(e)) /
|
|
((int64_t)reloc_value(f)));
|
|
break;
|
|
case TOKEN_SMOD:
|
|
if (is_just_unknown(e) || is_just_unknown(f))
|
|
e = unknown_expr();
|
|
else
|
|
e = scalarvect(((int64_t)reloc_value(e)) %
|
|
((int64_t)reloc_value(f)));
|
|
break;
|
|
}
|
|
}
|
|
return e;
|
|
}
|
|
|
|
static expr *eval_floatize(enum floatize type)
|
|
{
|
|
uint8_t result[16], *p; /* Up to 128 bits */
|
|
static const struct {
|
|
int bytes, start, len;
|
|
} formats[] = {
|
|
{ 1, 0, 1 }, /* FLOAT_8 */
|
|
{ 2, 0, 2 }, /* FLOAT_16 */
|
|
{ 4, 0, 4 }, /* FLOAT_32 */
|
|
{ 8, 0, 8 }, /* FLOAT_64 */
|
|
{ 10, 0, 8 }, /* FLOAT_80M */
|
|
{ 10, 8, 2 }, /* FLOAT_80E */
|
|
{ 16, 0, 8 }, /* FLOAT_128L */
|
|
{ 16, 8, 8 }, /* FLOAT_128H */
|
|
};
|
|
int sign = 1;
|
|
int64_t val;
|
|
int j;
|
|
|
|
i = scan(scpriv, tokval);
|
|
if (i != '(') {
|
|
error(ERR_NONFATAL, "expecting `('");
|
|
return NULL;
|
|
}
|
|
i = scan(scpriv, tokval);
|
|
if (i == '-' || i == '+') {
|
|
sign = (i == '-') ? -1 : 1;
|
|
i = scan(scpriv, tokval);
|
|
}
|
|
if (i != TOKEN_FLOAT) {
|
|
error(ERR_NONFATAL, "expecting floating-point number");
|
|
return NULL;
|
|
}
|
|
if (!float_const(tokval->t_charptr, sign, result,
|
|
formats[type].bytes, error))
|
|
return NULL;
|
|
i = scan(scpriv, tokval);
|
|
if (i != ')') {
|
|
error(ERR_NONFATAL, "expecting `)'");
|
|
return NULL;
|
|
}
|
|
|
|
p = result+formats[type].start+formats[type].len;
|
|
val = 0;
|
|
for (j = formats[type].len; j; j--) {
|
|
p--;
|
|
val = (val << 8) + *p;
|
|
}
|
|
|
|
begintemp();
|
|
addtotemp(EXPR_SIMPLE, val);
|
|
|
|
i = scan(scpriv, tokval);
|
|
return finishtemp();
|
|
}
|
|
|
|
static expr *eval_strfunc(enum strfunc type)
|
|
{
|
|
char *string;
|
|
size_t string_len;
|
|
int64_t val;
|
|
bool parens, rn_warn;
|
|
|
|
parens = false;
|
|
i = scan(scpriv, tokval);
|
|
if (i == '(') {
|
|
parens = true;
|
|
i = scan(scpriv, tokval);
|
|
}
|
|
if (i != TOKEN_STR) {
|
|
error(ERR_NONFATAL, "expecting string");
|
|
return NULL;
|
|
}
|
|
string_len = string_transform(tokval->t_charptr, tokval->t_inttwo,
|
|
&string, type);
|
|
if (string_len == (size_t)-1) {
|
|
error(ERR_NONFATAL, "invalid string for transform");
|
|
return NULL;
|
|
}
|
|
|
|
val = readstrnum(string, string_len, &rn_warn);
|
|
if (parens) {
|
|
i = scan(scpriv, tokval);
|
|
if (i != ')') {
|
|
error(ERR_NONFATAL, "expecting `)'");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (rn_warn)
|
|
error(ERR_WARNING|ERR_PASS1, "character constant too long");
|
|
|
|
begintemp();
|
|
addtotemp(EXPR_SIMPLE, val);
|
|
|
|
i = scan(scpriv, tokval);
|
|
return finishtemp();
|
|
}
|
|
|
|
static expr *expr6(int critical)
|
|
{
|
|
int32_t type;
|
|
expr *e;
|
|
int32_t label_seg;
|
|
int64_t label_ofs;
|
|
int64_t tmpval;
|
|
bool rn_warn;
|
|
char *scope;
|
|
|
|
switch (i) {
|
|
case '-':
|
|
i = scan(scpriv, tokval);
|
|
e = expr6(critical);
|
|
if (!e)
|
|
return NULL;
|
|
return scalar_mult(e, -1L, false);
|
|
|
|
case '+':
|
|
i = scan(scpriv, tokval);
|
|
return expr6(critical);
|
|
|
|
case '~':
|
|
i = scan(scpriv, tokval);
|
|
e = expr6(critical);
|
|
if (!e)
|
|
return NULL;
|
|
if (is_just_unknown(e))
|
|
return unknown_expr();
|
|
else if (!is_simple(e)) {
|
|
error(ERR_NONFATAL, "`~' operator may only be applied to"
|
|
" scalar values");
|
|
return NULL;
|
|
}
|
|
return scalarvect(~reloc_value(e));
|
|
|
|
case '!':
|
|
i = scan(scpriv, tokval);
|
|
e = expr6(critical);
|
|
if (!e)
|
|
return NULL;
|
|
if (is_just_unknown(e))
|
|
return unknown_expr();
|
|
else if (!is_simple(e)) {
|
|
error(ERR_NONFATAL, "`!' operator may only be applied to"
|
|
" scalar values");
|
|
return NULL;
|
|
}
|
|
return scalarvect(!reloc_value(e));
|
|
|
|
case TOKEN_SEG:
|
|
i = scan(scpriv, tokval);
|
|
e = expr6(critical);
|
|
if (!e)
|
|
return NULL;
|
|
e = segment_part(e);
|
|
if (!e)
|
|
return NULL;
|
|
if (is_unknown(e) && critical) {
|
|
error(ERR_NONFATAL, "unable to determine segment base");
|
|
return NULL;
|
|
}
|
|
return e;
|
|
|
|
case TOKEN_FLOATIZE:
|
|
return eval_floatize(tokval->t_integer);
|
|
|
|
case TOKEN_STRFUNC:
|
|
return eval_strfunc(tokval->t_integer);
|
|
|
|
case '(':
|
|
i = scan(scpriv, tokval);
|
|
e = bexpr(critical);
|
|
if (!e)
|
|
return NULL;
|
|
if (i != ')') {
|
|
error(ERR_NONFATAL, "expecting `)'");
|
|
return NULL;
|
|
}
|
|
i = scan(scpriv, tokval);
|
|
return e;
|
|
|
|
case TOKEN_NUM:
|
|
case TOKEN_STR:
|
|
case TOKEN_REG:
|
|
case TOKEN_ID:
|
|
case TOKEN_INSN: /* Opcodes that occur here are really labels */
|
|
case TOKEN_HERE:
|
|
case TOKEN_BASE:
|
|
begintemp();
|
|
switch (i) {
|
|
case TOKEN_NUM:
|
|
addtotemp(EXPR_SIMPLE, tokval->t_integer);
|
|
break;
|
|
case TOKEN_STR:
|
|
tmpval = readstrnum(tokval->t_charptr, tokval->t_inttwo, &rn_warn);
|
|
if (rn_warn)
|
|
error(ERR_WARNING|ERR_PASS1, "character constant too long");
|
|
addtotemp(EXPR_SIMPLE, tmpval);
|
|
break;
|
|
case TOKEN_REG:
|
|
addtotemp(tokval->t_integer, 1L);
|
|
if (hint && hint->type == EAH_NOHINT)
|
|
hint->base = tokval->t_integer, hint->type = EAH_MAKEBASE;
|
|
break;
|
|
case TOKEN_ID:
|
|
case TOKEN_INSN:
|
|
case TOKEN_HERE:
|
|
case TOKEN_BASE:
|
|
/*
|
|
* If !location->known, this indicates that no
|
|
* symbol, Here or Base references are valid because we
|
|
* are in preprocess-only mode.
|
|
*/
|
|
if (!location->known) {
|
|
error(ERR_NONFATAL,
|
|
"%s not supported in preprocess-only mode",
|
|
(i == TOKEN_HERE ? "`$'" :
|
|
i == TOKEN_BASE ? "`$$'" :
|
|
"symbol references"));
|
|
addtotemp(EXPR_UNKNOWN, 1L);
|
|
break;
|
|
}
|
|
|
|
type = EXPR_SIMPLE; /* might get overridden by UNKNOWN */
|
|
if (i == TOKEN_BASE) {
|
|
label_seg = in_abs_seg ? abs_seg : location->segment;
|
|
label_ofs = 0;
|
|
} else if (i == TOKEN_HERE) {
|
|
label_seg = in_abs_seg ? abs_seg : location->segment;
|
|
label_ofs = in_abs_seg ? abs_offset : location->offset;
|
|
} else {
|
|
if (!labelfunc(tokval->t_charptr, &label_seg, &label_ofs)) {
|
|
scope = local_scope(tokval->t_charptr);
|
|
if (critical == 2) {
|
|
error(ERR_NONFATAL, "symbol `%s%s' undefined",
|
|
scope,tokval->t_charptr);
|
|
return NULL;
|
|
} else if (critical == 1) {
|
|
error(ERR_NONFATAL,
|
|
"symbol `%s%s' not defined before use",
|
|
scope,tokval->t_charptr);
|
|
return NULL;
|
|
} else {
|
|
if (opflags)
|
|
*opflags |= 1;
|
|
type = EXPR_UNKNOWN;
|
|
label_seg = NO_SEG;
|
|
label_ofs = 1;
|
|
}
|
|
}
|
|
if (opflags && is_extern(tokval->t_charptr))
|
|
*opflags |= OPFLAG_EXTERN;
|
|
}
|
|
addtotemp(type, label_ofs);
|
|
if (label_seg != NO_SEG)
|
|
addtotemp(EXPR_SEGBASE + label_seg, 1L);
|
|
break;
|
|
}
|
|
i = scan(scpriv, tokval);
|
|
return finishtemp();
|
|
|
|
default:
|
|
error(ERR_NONFATAL, "expression syntax error");
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void eval_global_info(struct ofmt *output, lfunc lookup_label,
|
|
struct location * locp)
|
|
{
|
|
outfmt = output;
|
|
labelfunc = lookup_label;
|
|
location = locp;
|
|
}
|
|
|
|
expr *evaluate(scanner sc, void *scprivate, struct tokenval *tv,
|
|
int *fwref, int critical, efunc report_error,
|
|
struct eval_hints *hints)
|
|
{
|
|
expr *e;
|
|
expr *f = NULL;
|
|
|
|
hint = hints;
|
|
if (hint)
|
|
hint->type = EAH_NOHINT;
|
|
|
|
if (critical & CRITICAL) {
|
|
critical &= ~CRITICAL;
|
|
bexpr = rexp0;
|
|
} else
|
|
bexpr = expr0;
|
|
|
|
scan = sc;
|
|
scpriv = scprivate;
|
|
tokval = tv;
|
|
error = report_error;
|
|
opflags = fwref;
|
|
|
|
if (tokval->t_type == TOKEN_INVALID)
|
|
i = scan(scpriv, tokval);
|
|
else
|
|
i = tokval->t_type;
|
|
|
|
while (ntempexprs) /* initialize temporary storage */
|
|
nasm_free(tempexprs[--ntempexprs]);
|
|
|
|
e = bexpr(critical);
|
|
if (!e)
|
|
return NULL;
|
|
|
|
if (i == TOKEN_WRT) {
|
|
i = scan(scpriv, tokval); /* eat the WRT */
|
|
f = expr6(critical);
|
|
if (!f)
|
|
return NULL;
|
|
}
|
|
e = scalar_mult(e, 1L, false); /* strip far-absolute segment part */
|
|
if (f) {
|
|
expr *g;
|
|
if (is_just_unknown(f))
|
|
g = unknown_expr();
|
|
else {
|
|
int64_t value;
|
|
begintemp();
|
|
if (!is_reloc(f)) {
|
|
error(ERR_NONFATAL, "invalid right-hand operand to WRT");
|
|
return NULL;
|
|
}
|
|
value = reloc_seg(f);
|
|
if (value == NO_SEG)
|
|
value = reloc_value(f) | SEG_ABS;
|
|
else if (!(value & SEG_ABS) && !(value % 2) && critical) {
|
|
error(ERR_NONFATAL, "invalid right-hand operand to WRT");
|
|
return NULL;
|
|
}
|
|
addtotemp(EXPR_WRT, value);
|
|
g = finishtemp();
|
|
}
|
|
e = add_vectors(e, g);
|
|
}
|
|
return e;
|
|
}
|