309 lines
7.6 KiB
C
309 lines
7.6 KiB
C
/* $Header$ */
|
|
/* SEMANTIC ANALYSIS (CHAPTER 7RM) -- BINARY OPERATORS */
|
|
|
|
#include "botch_free.h" /* UF */
|
|
#include "idf.h"
|
|
#include "arith.h"
|
|
#include "type.h"
|
|
#include "struct.h"
|
|
#include "label.h"
|
|
#include "expr.h"
|
|
#include "Lpars.h"
|
|
#include "storage.h"
|
|
|
|
extern char options[];
|
|
extern char *symbol2str();
|
|
|
|
/* This chapter asks for the repeated application of code to handle
|
|
an operation that may be executed at compile time or at run time,
|
|
depending on the constancy of the operands.
|
|
*/
|
|
|
|
ch7bin(expp, oper, expr)
|
|
register struct expr **expp;
|
|
struct expr *expr;
|
|
{
|
|
/* apply binary operator oper between *expp and expr.
|
|
*/
|
|
any2opnd(expp, oper);
|
|
any2opnd(&expr, oper);
|
|
switch (oper) {
|
|
int fund;
|
|
case '[': /* RM 7.1 */
|
|
/* RM 14.3 states that indexing follows the commutative laws */
|
|
switch ((*expp)->ex_type->tp_fund) {
|
|
case POINTER:
|
|
case ARRAY:
|
|
break;
|
|
case ERRONEOUS:
|
|
return;
|
|
default: /* unindexable */
|
|
switch (expr->ex_type->tp_fund) {
|
|
case POINTER:
|
|
case ARRAY:
|
|
break;
|
|
case ERRONEOUS:
|
|
return;
|
|
default:
|
|
expr_error(*expp,
|
|
"indexing an object of type %s",
|
|
symbol2str((*expp)->ex_type->tp_fund));
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
ch7bin(expp, '+', expr);
|
|
ch7mon('*', expp);
|
|
break;
|
|
case '(': /* RM 7.1 */
|
|
if ( (*expp)->ex_type->tp_fund == POINTER &&
|
|
(*expp)->ex_type->tp_up->tp_fund == FUNCTION
|
|
) {
|
|
if (options['R'])
|
|
warning("function pointer called");
|
|
ch7mon('*', expp);
|
|
}
|
|
if ((*expp)->ex_type->tp_fund != FUNCTION) {
|
|
expr_error(*expp, "call of non-function (%s)",
|
|
symbol2str((*expp)->ex_type->tp_fund));
|
|
/* leave the expression; it may still serve */
|
|
free_expression(expr); /* there go the parameters */
|
|
}
|
|
else
|
|
*expp = new_oper((*expp)->ex_type->tp_up,
|
|
*expp, '(', expr);
|
|
break;
|
|
case PARCOMMA: /* RM 7.1 */
|
|
if ((*expp)->ex_type->tp_fund == FUNCTION)
|
|
function2pointer(expp);
|
|
*expp = new_oper(expr->ex_type, *expp, PARCOMMA, expr);
|
|
break;
|
|
case '%':
|
|
fund = arithbalance(expp, oper, &expr);
|
|
if (fund == DOUBLE) {
|
|
expr_error(*expp, "floating operand to %%");
|
|
erroneous2int(expp);
|
|
}
|
|
else
|
|
non_commutative_binop(expp, oper, expr);
|
|
break;
|
|
case '/':
|
|
fund = arithbalance(expp, oper, &expr);
|
|
non_commutative_binop(expp, oper, expr);
|
|
break;
|
|
case '*':
|
|
fund = arithbalance(expp, oper, &expr);
|
|
commutative_binop(expp, oper, expr);
|
|
break;
|
|
case '+':
|
|
if (expr->ex_type->tp_fund == POINTER) {
|
|
/* swap operands */
|
|
struct expr *etmp = expr;
|
|
expr = *expp;
|
|
*expp = etmp;
|
|
}
|
|
if ((*expp)->ex_type->tp_fund == POINTER) {
|
|
pointer_arithmetic(expp, oper, &expr);
|
|
if ( expr->ex_type->tp_size !=
|
|
(*expp)->ex_type->tp_size
|
|
) {
|
|
ch7cast(&expr, CAST, (*expp)->ex_type);
|
|
}
|
|
pointer_binary(expp, oper, expr);
|
|
}
|
|
else {
|
|
fund = arithbalance(expp, oper, &expr);
|
|
commutative_binop(expp, oper, expr);
|
|
}
|
|
break;
|
|
case '-':
|
|
if ((*expp)->ex_type->tp_fund == POINTER) {
|
|
if (expr->ex_type->tp_fund == POINTER)
|
|
pntminuspnt(expp, oper, expr);
|
|
else {
|
|
pointer_arithmetic(expp, oper, &expr);
|
|
pointer_binary(expp, oper, expr);
|
|
}
|
|
}
|
|
else {
|
|
fund = arithbalance(expp, oper, &expr);
|
|
non_commutative_binop(expp, oper, expr);
|
|
}
|
|
break;
|
|
case LEFT:
|
|
case RIGHT:
|
|
opnd2integral(expp, oper);
|
|
opnd2integral(&expr, oper);
|
|
ch7cast(&expr, oper, int_type); /* leftop should be int */
|
|
non_commutative_binop(expp, oper, expr);
|
|
break;
|
|
case '<':
|
|
case '>':
|
|
case LESSEQ:
|
|
case GREATEREQ:
|
|
case EQUAL:
|
|
case NOTEQUAL:
|
|
relbalance(expp, oper, &expr);
|
|
non_commutative_binop(expp, oper, expr);
|
|
(*expp)->ex_type = int_type;
|
|
break;
|
|
case '&':
|
|
case '^':
|
|
case '|':
|
|
opnd2integral(expp, oper);
|
|
opnd2integral(&expr, oper);
|
|
fund = arithbalance(expp, oper, &expr); /* <=== */
|
|
commutative_binop(expp, oper, expr);
|
|
break;
|
|
case AND:
|
|
case OR:
|
|
opnd2test(expp, oper);
|
|
opnd2test(&expr, oper);
|
|
if (is_cp_cst(*expp)) {
|
|
struct expr *ex = *expp;
|
|
|
|
/* the following condition is a short-hand for
|
|
((oper == AND) && o1) || ((oper == OR) && !o1)
|
|
where o1 == (*expp)->VL_VALUE;
|
|
and ((oper == AND) || (oper == OR))
|
|
*/
|
|
if ((oper == AND) == ((*expp)->VL_VALUE != (arith)0))
|
|
*expp = expr;
|
|
else {
|
|
free_expression(expr);
|
|
*expp = intexpr((arith)((oper == AND) ? 0 : 1),
|
|
INT);
|
|
}
|
|
free_expression(ex);
|
|
}
|
|
else
|
|
if (is_cp_cst(expr)) {
|
|
/* Note!!!: the following condition is a short-hand for
|
|
((oper == AND) && o2) || ((oper == OR) && !o2)
|
|
where o2 == expr->VL_VALUE
|
|
and ((oper == AND) || (oper == OR))
|
|
*/
|
|
if ((oper == AND) == (expr->VL_VALUE != (arith)0))
|
|
free_expression(expr);
|
|
else {
|
|
if (oper == OR)
|
|
expr->VL_VALUE = (arith)1;
|
|
ch7bin(expp, ',', expr);
|
|
}
|
|
}
|
|
else
|
|
*expp = new_oper(int_type, *expp, oper, expr);
|
|
(*expp)->ex_flags |= EX_LOGICAL;
|
|
break;
|
|
case ':':
|
|
if ( is_struct_or_union((*expp)->ex_type->tp_fund)
|
|
|| is_struct_or_union(expr->ex_type->tp_fund)
|
|
) {
|
|
if ((*expp)->ex_type != expr->ex_type) {
|
|
expr_error(*expp, "illegal balance");
|
|
}
|
|
}
|
|
else {
|
|
relbalance(expp, oper, &expr);
|
|
}
|
|
*expp = new_oper((*expp)->ex_type, *expp, oper, expr);
|
|
break;
|
|
case '?':
|
|
opnd2logical(expp, oper);
|
|
if (is_cp_cst(*expp))
|
|
*expp = (*expp)->VL_VALUE ?
|
|
expr->OP_LEFT : expr->OP_RIGHT;
|
|
else
|
|
*expp = new_oper(expr->ex_type, *expp, oper, expr);
|
|
break;
|
|
case ',':
|
|
if (is_cp_cst(*expp))
|
|
*expp = expr;
|
|
else
|
|
*expp = new_oper(expr->ex_type, *expp, oper, expr);
|
|
(*expp)->ex_flags |= EX_COMMA;
|
|
break;
|
|
}
|
|
}
|
|
|
|
pntminuspnt(expp, oper, expr)
|
|
register struct expr **expp, *expr;
|
|
{
|
|
/* Subtracting two pointers is so complicated it merits a
|
|
routine of its own.
|
|
*/
|
|
struct type *up_type = (*expp)->ex_type->tp_up;
|
|
|
|
if (up_type != expr->ex_type->tp_up) {
|
|
expr_error(*expp, "subtracting incompatible pointers");
|
|
free_expression(expr);
|
|
erroneous2int(expp);
|
|
return;
|
|
}
|
|
/* we hope the optimizer will eliminate the load-time
|
|
pointer subtraction
|
|
*/
|
|
*expp = new_oper((*expp)->ex_type, *expp, oper, expr);
|
|
ch7cast(expp, CAST, pa_type); /* ptr-ptr: result has pa_type */
|
|
ch7bin(expp, '/',
|
|
intexpr(size_of_type(up_type, "object"), pa_type->tp_fund));
|
|
ch7cast(expp, CAST, int_type); /* result will be an integer expr */
|
|
}
|
|
|
|
non_commutative_binop(expp, oper, expr)
|
|
register struct expr **expp, *expr;
|
|
{
|
|
/* Constructs in *expp the operation indicated by the operands.
|
|
"oper" is a non-commutative operator
|
|
*/
|
|
if (is_cp_cst(expr) && is_cp_cst(*expp))
|
|
cstbin(expp, oper, expr);
|
|
else
|
|
*expp = new_oper((*expp)->ex_type, *expp, oper, expr);
|
|
}
|
|
|
|
commutative_binop(expp, oper, expr)
|
|
register struct expr **expp, *expr;
|
|
{
|
|
/* Constructs in *expp the operation indicated by the operands.
|
|
"oper" is a commutative operator
|
|
*/
|
|
if (is_cp_cst(expr) && is_cp_cst(*expp))
|
|
cstbin(expp, oper, expr);
|
|
else
|
|
if ((*expp)->ex_depth > expr->ex_depth)
|
|
*expp = new_oper((*expp)->ex_type, *expp, oper, expr);
|
|
else
|
|
*expp = new_oper((*expp)->ex_type, expr, oper, *expp);
|
|
}
|
|
|
|
pointer_arithmetic(expp1, oper, expp2)
|
|
register struct expr **expp1, **expp2;
|
|
{
|
|
/* prepares the integral expression expp2 in order to
|
|
apply it to the pointer expression expp1
|
|
*/
|
|
if (any2arith(expp2, oper) == DOUBLE) {
|
|
expr_error(*expp2,
|
|
"illegal combination of float and pointer");
|
|
erroneous2int(expp2);
|
|
}
|
|
ch7bin( expp2, '*',
|
|
intexpr(size_of_type((*expp1)->ex_type->tp_up, "object"),
|
|
pa_type->tp_fund)
|
|
);
|
|
}
|
|
|
|
pointer_binary(expp, oper, expr)
|
|
register struct expr **expp, *expr;
|
|
{
|
|
/* constructs the pointer arithmetic expression out of
|
|
a pointer expression, a binary operator and an integral
|
|
expression.
|
|
*/
|
|
if (is_ld_cst(expr) && is_ld_cst(*expp))
|
|
cstbin(expp, oper, expr);
|
|
else
|
|
*expp = new_oper((*expp)->ex_type, *expp, oper, expr);
|
|
}
|