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/*
* exprlib.c
*
* Library routines to manipulate expression data types.
*/
#include "nasm.h"
/*
* Return true if the argument is a simple scalar. (Or a far-
* absolute, which counts.)
*/
int is_simple(expr * vect)
{
while (vect->type && !vect->value)
vect++;
if (!vect->type)
return 1;
if (vect->type != EXPR_SIMPLE)
return 0;
do {
vect++;
} while (vect->type && !vect->value);
if (vect->type && vect->type < EXPR_SEGBASE + SEG_ABS)
return 0;
return 1;
}
/*
* Return true if the argument is a simple scalar, _NOT_ a far-
* absolute.
*/
int is_really_simple(expr * vect)
{
while (vect->type && !vect->value)
vect++;
if (!vect->type)
return 1;
if (vect->type != EXPR_SIMPLE)
return 0;
do {
vect++;
} while (vect->type && !vect->value);
if (vect->type)
return 0;
return 1;
}
/*
* Return true if the argument is relocatable (i.e. a simple
* scalar, plus at most one segment-base, plus possibly a WRT).
*/
int is_reloc(expr * vect)
{
while (vect->type && !vect->value) /* skip initial value-0 terms */
vect++;
if (!vect->type) /* trivially return true if nothing */
return 1; /* is present apart from value-0s */
if (vect->type < EXPR_SIMPLE) /* false if a register is present */
return 0;
if (vect->type == EXPR_SIMPLE) { /* skip over a pure number term... */
do {
vect++;
} while (vect->type && !vect->value);
if (!vect->type) /* ...returning true if that's all */
return 1;
}
if (vect->type == EXPR_WRT) { /* skip over a WRT term... */
do {
vect++;
} while (vect->type && !vect->value);
if (!vect->type) /* ...returning true if that's all */
return 1;
}
if (vect->value != 0 && vect->value != 1)
return 0; /* segment base multiplier non-unity */
do { /* skip over _one_ seg-base term... */
vect++;
} while (vect->type && !vect->value);
if (!vect->type) /* ...returning true if that's all */
return 1;
return 0; /* And return false if there's more */
}
/*
* Return true if the argument contains an `unknown' part.
*/
int is_unknown(expr * vect)
{
while (vect->type && vect->type < EXPR_UNKNOWN)
vect++;
return (vect->type == EXPR_UNKNOWN);
}
/*
* Return true if the argument contains nothing but an `unknown'
* part.
*/
int is_just_unknown(expr * vect)
{
while (vect->type && !vect->value)
vect++;
return (vect->type == EXPR_UNKNOWN);
}
/*
* Return the scalar part of a relocatable vector. (Including
* simple scalar vectors - those qualify as relocatable.)
*/
int64_t reloc_value(expr * vect)
{
while (vect->type && !vect->value)
vect++;
if (!vect->type)
return 0;
if (vect->type == EXPR_SIMPLE)
return vect->value;
else
return 0;
}
/*
* Return the segment number of a relocatable vector, or NO_SEG for
* simple scalars.
*/
int32_t reloc_seg(expr * vect)
{
while (vect->type && (vect->type == EXPR_WRT || !vect->value))
vect++;
if (vect->type == EXPR_SIMPLE) {
do {
vect++;
} while (vect->type && (vect->type == EXPR_WRT || !vect->value));
}
if (!vect->type)
return NO_SEG;
else
return vect->type - EXPR_SEGBASE;
}
/*
* Return the WRT segment number of a relocatable vector, or NO_SEG
* if no WRT part is present.
*/
int32_t reloc_wrt(expr * vect)
{
while (vect->type && vect->type < EXPR_WRT)
vect++;
if (vect->type == EXPR_WRT) {
return vect->value;
} else
return NO_SEG;
}
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