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Fix for compiler crash when function arguments are unknown. 

When a user or system function is called on the RHS of a continuous
assignment, and one of the function arguments is an undeclared
identifier, the compiler reports the error correctly but then
crashes. This patch fixes the crash.
This commit is contained in:
Martin Whitaker 2011-04-02 22:31:19 +01:00 committed by Stephen Williams
parent 93067149f1
commit 86801bef52
1 changed files with 17 additions and 2 deletions
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19
elab_expr.cc
View File

@ -1172,14 +1172,19 @@ NetExpr* PECallFunction::elaborate_sfunc_(Design*des, NetScope*scope,
bool need_const = NEED_CONST & flags;
unsigned parm_errors = 0;
unsigned missing_parms = 0;
for (unsigned idx = 0 ; idx < nparms ; idx += 1) {
PExpr*expr = parms_[idx];
if (expr) {
NetExpr*tmp = elab_sys_task_arg(des, scope, name, idx,
expr, need_const);
fun->parm(idx, tmp);
if (tmp) {
fun->parm(idx, tmp);
} else {
parm_errors += 1;
fun->parm(idx, 0);
}
} else {
missing_parms += 1;
fun->parm(idx, 0);
@ -1194,6 +1199,9 @@ NetExpr* PECallFunction::elaborate_sfunc_(Design*des, NetScope*scope,
des->errors += 1;
}
if (missing_parms || parm_errors)
return 0;
NetExpr*tmp = pad_to_width(fun, expr_wid, *this);
tmp->cast_signed(signed_flag_);
@ -1312,6 +1320,7 @@ NetExpr* PECallFunction::elaborate_expr(Design*des, NetScope*scope,
bool need_const = NEED_CONST & flags;
unsigned parm_errors = 0;
unsigned missing_parms = 0;
for (unsigned idx = 0 ; idx < parms.count() ; idx += 1) {
PExpr*tmp = parms_[idx];
@ -1320,6 +1329,10 @@ NetExpr* PECallFunction::elaborate_expr(Design*des, NetScope*scope,
def->port(idx)->data_type(),
(unsigned)def->port(idx)->vector_width(),
tmp, need_const);
if (parms[idx] == 0) {
parm_errors += 1;
continue;
}
if (NetEEvent*evt = dynamic_cast<NetEEvent*> (parms[idx])) {
cerr << evt->get_fileline() << ": error: An event '"
<< evt->event()->name() << "' can not be a user "
@ -1347,6 +1360,8 @@ NetExpr* PECallFunction::elaborate_expr(Design*des, NetScope*scope,
des->errors += 1;
}
if (missing_parms || parm_errors)
return 0;
/* Look for the return value signal for the called
function. This return value is a magic signal in the scope