static expr *expr3(int critical)
{
expr *e, *f;
e = expr4(critical);
if (!e)
return NULL;
while (i == TOKEN_SHL || i == TOKEN_SHR) {
int j = i;
i = scan(scpriv, tokval);
f = expr4(critical);
if (!f)
return NULL;
if (!(is_simple(e) || is_just_unknown(e)) ||
!(is_simple(f) || is_just_unknown(f))) {
nasm_error(ERR_NONFATAL, "shift operator may only be applied to"
" scalar values");
} else if (is_just_unknown(e) || is_just_unknown(f)) {
e = unknown_expr();
} else
switch (j) {
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 *expr2(int critical)
{
expr *e, *f;
e = expr3(critical);
if (!e)
return NULL;
while (i == '&') {
i = scan(scpriv, tokval);
f = expr3(critical);
if (!f)
return NULL;
if (!(is_simple(e) || is_just_unknown(e)) ||
!(is_simple(f) || is_just_unknown(f))) {
nasm_error(ERR_NONFATAL, "`&' operator may only be applied to"
" scalar values");
}
if (is_just_unknown(e) || is_just_unknown(f))
e = unknown_expr();
else
e = scalarvect(reloc_value(e) & reloc_value(f));
}
return e;
}
static expr *rexp1(int critical)
{
expr *e, *f;
e = rexp2(critical);
if (!e)
return NULL;
while (i == TOKEN_DBL_XOR) {
i = scan(scpriv, tokval);
f = rexp2(critical);
if (!f)
return NULL;
if (!(is_simple(e) || is_just_unknown(e)) ||
!(is_simple(f) || is_just_unknown(f))) {
nasm_error(ERR_NONFATAL, "`^' operator may only be applied to"
" scalar values");
}
if (is_just_unknown(e) || is_just_unknown(f))
e = unknown_expr();
else
e = scalarvect((int64_t)(!reloc_value(e) ^ !reloc_value(f)));
}
return e;
}
/*
* The SEG operator: calculate the segment part of a relocatable
* value. Return NULL, as usual, if an error occurs. Report the
* error too.
*/
static expr *segment_part(expr * e)
{
int32_t seg;
if (is_unknown(e))
return unknown_expr();
if (!is_reloc(e)) {
nasm_error(ERR_NONFATAL, "cannot apply SEG to a non-relocatable value");
return NULL;
}
seg = reloc_seg(e);
if (seg == NO_SEG) {
nasm_error(ERR_NONFATAL, "cannot apply SEG to a non-relocatable value");
return NULL;
} else if (seg & SEG_ABS) {
return scalarvect(seg & ~SEG_ABS);
} else if (seg & 1) {
nasm_error(ERR_NONFATAL, "SEG applied to something which"
" is already a segment base");
return NULL;
} else {
int32_t base = ofmt->segbase(seg + 1);
begintemp();
addtotemp((base == NO_SEG ? EXPR_UNKNOWN : EXPR_SEGBASE + base),
1L);
return finishtemp();
}
}
static struct ast_node*
stmt(void *opaque)
{
struct ast_node *node;
token_t prev_token;
prev_token = current_token;
if (match(TOKEN_FUNCTION))
node = process_function(opaque);
else if (match(TOKEN_LOCAL))
node = process_local_declaration(opaque);
else if (match(TOKEN_IF))
node = if_expr(opaque);
else if (match(TOKEN_FOR))
node = for_expr(opaque);
else if (match(TOKEN_WHILE))
node = while_expr(opaque);
else if (match(TOKEN_BREAK))
node = break_expr(opaque);
else if (match(TOKEN_CONTINUE))
node = continue_expr(opaque);
else if (match(TOKEN_RETURN))
node = process_return_node(opaque);
else if (match(TOKEN_LBRACE))
node = process_scope(opaque);
else if (match(TOKEN_RBRACE))
node = end_scope_expr(opaque);
else if (match(TOKEN_UNKNOWN))
node = unknown_expr(opaque);
else
node = other_expr(opaque);
return node;
}
static expr *rexp3(int critical)
{
expr *e, *f;
int64_t v;
e = expr0(critical);
if (!e)
return NULL;
while (i == TOKEN_EQ || i == TOKEN_LT || i == TOKEN_GT ||
i == TOKEN_NE || i == TOKEN_LE || i == TOKEN_GE) {
int j = i;
i = scan(scpriv, tokval);
f = expr0(critical);
if (!f)
return NULL;
e = add_vectors(e, scalar_mult(f, -1L, false));
switch (j) {
case TOKEN_EQ:
case TOKEN_NE:
if (is_unknown(e))
v = -1; /* means unknown */
else if (!is_really_simple(e) || reloc_value(e) != 0)
v = (j == TOKEN_NE); /* unequal, so return true if NE */
else
v = (j == TOKEN_EQ); /* equal, so return true if EQ */
break;
default:
if (is_unknown(e))
v = -1; /* means unknown */
else if (!is_really_simple(e)) {
nasm_error(ERR_NONFATAL,
"`%s': operands differ by a non-scalar",
(j == TOKEN_LE ? "<=" : j == TOKEN_LT ? "<" : j ==
TOKEN_GE ? ">=" : ">"));
v = 0; /* must set it to _something_ */
} else {
int64_t vv = reloc_value(e);
if (vv == 0)
v = (j == TOKEN_LE || j == TOKEN_GE);
else if (vv > 0)
v = (j == TOKEN_GE || j == TOKEN_GT);
else /* vv < 0 */
v = (j == TOKEN_LE || j == TOKEN_LT);
}
break;
}
if (v == -1)
e = unknown_expr();
else
e = scalarvect(v);
}
return e;
}
expr *evaluate(scanner sc, void *scprivate, struct tokenval *tv,
int *fwref, int critical, 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;
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)) {
nasm_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) {
nasm_error(ERR_NONFATAL, "invalid right-hand operand to WRT");
return NULL;
}
addtotemp(EXPR_WRT, value);
g = finishtemp();
}
e = add_vectors(e, g);
}
return e;
}
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)) {
nasm_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)) {
nasm_error(ERR_NONFATAL, "`!' operator may only be applied to"
" scalar values");
return NULL;
}
return scalarvect(!reloc_value(e));
case TOKEN_IFUNC:
{
enum ifunc func = tokval->t_integer;
i = scan(scpriv, tokval);
e = expr6(critical);
if (!e)
return NULL;
if (is_just_unknown(e))
return unknown_expr();
else if (!is_simple(e)) {
nasm_error(ERR_NONFATAL, "function may only be applied to"
" scalar values");
return NULL;
}
return scalarvect(eval_ifunc(reloc_value(e), func));
}
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) {
nasm_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 != ')') {
nasm_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:
case TOKEN_DECORATOR:
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)
nasm_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) {
nasm_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 (!lookup_label(tokval->t_charptr, &label_seg, &label_ofs)) {
scope = local_scope(tokval->t_charptr);
if (critical == 2) {
nasm_error(ERR_NONFATAL, "symbol `%s%s' undefined",
scope,tokval->t_charptr);
return NULL;
} else if (critical == 1) {
nasm_error(ERR_NONFATAL,
"symbol `%s%s' not defined before use",
scope,tokval->t_charptr);
return NULL;
} else {
if (opflags)
*opflags |= OPFLAG_FORWARD;
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;
case TOKEN_DECORATOR:
addtotemp(EXPR_RDSAE, tokval->t_integer);
break;
}
i = scan(scpriv, tokval);
return finishtemp();
default:
nasm_error(ERR_NONFATAL, "expression syntax error");
return NULL;
}
}
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)))) {
nasm_error(ERR_NONFATAL, "division operator may only be applied to"
" scalar values");
return NULL;
}
if (j != '*' && !is_unknown(f) && reloc_value(f) == 0) {
nasm_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 {
nasm_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;
}
