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tccgen.c: Recognise constant expressions with conditional operator.

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tests/tests2/78_vla_label.c: Check that int a[1 ? 1 : 1] is not a VLA.
This commit is contained in:
Edmund Grimley Evans 2015-11-20 00:24:46 +00:00
parent 30c54c9d43
commit 992cbda8d0
2 changed files with 21 additions and 10 deletions
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14
tccgen.c
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@ -4522,9 +4522,13 @@ static void expr_cond(void)
SValue sv;
CType type, type1, type2;
if (const_wanted) {
if (const_wanted)
expr_lor_const();
if (tok == '?') {
else
expr_lor();
if (tok == '?') {
next();
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
CType boolean;
int c;
boolean.t = VT_BOOL;
@ -4532,7 +4536,6 @@ static void expr_cond(void)
gen_cast(&boolean);
c = vtop->c.i;
vpop();
next();
if (tok != ':' || !gnu_ext) {
vpop();
gexpr();
@ -4544,10 +4547,7 @@ static void expr_cond(void)
if (c)
vpop();
}
} else {
expr_lor();
if (tok == '?') {
next();
else {
if (vtop != vstack) {
/* needed to avoid having different registers saved in
each branch */

17
tests/tests2/78_vla_label.c
View File

@ -1,8 +1,7 @@
#include <stdio.h>
/* This test segfaults as of April 27, 2015. */
void f(int argc)
void f1(int argc)
{
char test[argc];
if(0)
@ -13,9 +12,21 @@ void f(int argc)
goto label;
}
/* This segfaulted on 2015-11-19. */
void f2(void)
{
goto start;
{
int a[1 ? 1 : 1]; /* not a variable-length array */
start:
a[0] = 0;
}
}
int main()
{
f(2);
f1(2);
f2();
return 0;
}