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- /* $Header$ */
- /* SEMANTIC ANALYSIS (CHAPTER 7RM) -- MONADIC OPERATORS */
- #include "nobitfield.h"
- #include "botch_free.h"
- #include "Lpars.h"
- #include "arith.h"
- #include "type.h"
- #include "label.h"
- #include "expr.h"
- #include "storage.h"
- #include "idf.h"
- #include "def.h"
- extern char options[];
- char *symbol2str();
- ch7mon(oper, expp)
- register struct expr **expp;
- {
- /* The monadic prefix operator oper is applied to *expp.
- */
- register struct expr *expr;
- switch (oper) {
- case '*': /* RM 7.2 */
- /* no FIELD type allowed */
- if ((*expp)->ex_type->tp_fund == ARRAY)
- array2pointer(expp);
- if ((*expp)->ex_type->tp_fund != POINTER) {
- expr_error(*expp,
- "* applied to non-pointer (%s)",
- symbol2str((*expp)->ex_type->tp_fund));
- }
- else {
- expr = *expp;
- if (expr->ex_lvalue == 0)
- /* dereference in administration only */
- expr->ex_type = expr->ex_type->tp_up;
- else /* runtime code */
- *expp = new_oper(expr->ex_type->tp_up, NILEXPR,
- '*', expr);
- (*expp)->ex_lvalue = (
- (*expp)->ex_type->tp_fund != ARRAY &&
- (*expp)->ex_type->tp_fund != FUNCTION);
- }
- break;
- case '&':
- if ((*expp)->ex_type->tp_fund == ARRAY) {
- array2pointer(expp);
- }
- else
- if ((*expp)->ex_type->tp_fund == FUNCTION) {
- function2pointer(expp);
- }
- else
- #ifndef NOBITFIELD
- if ((*expp)->ex_type->tp_fund == FIELD) {
- expr_error(*expp, "& applied to field variable");
- }
- else
- #endif NOBITFIELD
- if (!(*expp)->ex_lvalue) {
- expr_error(*expp, "& applied to non-lvalue");
- }
- else {
- /* assume that enums are already filtered out */
- if ((*expp)->ex_class == Value && (*expp)->VL_IDF) {
- register struct def *def =
- (*expp)->VL_IDF->id_def;
- /* &<var> indicates that <var> cannot
- be used as register anymore
- */
- if (def->df_sc == REGISTER) {
- expr_error(*expp,
- "& on register variable not allowed");
- break; /* break case '&' */
- }
- def->df_register = REG_NONE;
- }
- (*expp)->ex_type = pointer_to((*expp)->ex_type);
- (*expp)->ex_lvalue = 0;
- }
- break;
- case '~':
- {
- int fund = (*expp)->ex_type->tp_fund;
- if (fund == FLOAT || fund == DOUBLE) {
- expr_error(*expp, "~ not allowed on %s operands",
- symbol2str(fund));
- erroneous2int(expp);
- break;
- }
- }
- case '-':
- any2arith(expp, oper);
- if (is_cp_cst(*expp)) {
- arith o1 = (*expp)->VL_VALUE;
- if (oper == '-')
- o1 = -o1;
- else
- o1 = ~o1;
- (*expp)->VL_VALUE = o1;
- }
- else
- if (is_fp_cst(*expp))
- switch_sign_fp(*expp);
- else
- *expp = new_oper((*expp)->ex_type,
- NILEXPR, oper, *expp);
- break;
- case '!':
- if ((*expp)->ex_type->tp_fund == FUNCTION)
- function2pointer(expp);
- if ((*expp)->ex_type->tp_fund != POINTER)
- any2arith(expp, oper);
- opnd2test(expp, '!');
- if (is_cp_cst(*expp)) {
- arith o1 = (*expp)->VL_VALUE;
- o1 = !o1;
- (*expp)->VL_VALUE = o1;
- (*expp)->ex_type = int_type;
- }
- else
- *expp = new_oper(int_type, NILEXPR, oper, *expp);
- (*expp)->ex_flags |= EX_LOGICAL;
- break;
- case PLUSPLUS:
- case MINMIN:
- ch7incr(expp, oper);
- break;
- case SIZEOF:
- if ( (*expp)->ex_class == Value
- && (*expp)->VL_IDF
- && (*expp)->VL_IDF->id_def->df_formal_array
- )
- warning("sizeof formal array %s is sizeof pointer!",
- (*expp)->VL_IDF->id_text);
- expr = intexpr(size_of_type((*expp)->ex_type, "object"), INT);
- free_expression(*expp);
- *expp = expr;
- (*expp)->ex_flags |= EX_SIZEOF;
- break;
- }
- }
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