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Fix crash from an incomplete do-while statement #680

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Fix crash from an incomplete do-while statement #680

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3e0c5ba
Fix crash from incomplete `do-while` statement
Daniel-Cortez Sep 29, 2021
f053b83
Add a test
Daniel-Cortez Sep 29, 2021
1e43ec0
Forgot to replace one use of POPSTK_I
Daniel-Cortez Mar 8, 2022
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7 changes: 4 additions & 3 deletions source/compiler/sc1.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5972,6 +5972,7 @@ static int test(int label,int parens,int invert)
cell cidx;
int ident,tag;
int endtok;
short save_intest;
cell constval;
symbol *sym;
int localstaging=FALSE;
Expand All @@ -5985,7 +5986,7 @@ static int test(int label,int parens,int invert)
#endif
} /* if */

PUSHSTK_I(sc_intest);
save_intest=sc_intest;
sc_intest=TRUE;
endtok=0;
if (parens!=TEST_PLAIN) {
Expand Down Expand Up @@ -6016,7 +6017,7 @@ static int test(int label,int parens,int invert)
} /* if */
if (ident==iCONSTEXPR) { /* constant expression */
int testtype=0;
sc_intest=(short)POPSTK_I();/* restore stack */
sc_intest=save_intest; /* restore stack */
stgdel(index,cidx);
if (constval) { /* code always executed */
error(206); /* redundant test: always non-zero */
Expand All @@ -6039,7 +6040,7 @@ static int test(int label,int parens,int invert)
else
jmp_eq0(label); /* jump to label if false (equal to 0) */
markexpr(sEXPR,NULL,0); /* end expression (give optimizer a chance) */
sc_intest=(short)POPSTK_I(); /* double typecast to avoid warning with Microsoft C */
sc_intest=save_intest;
if (localstaging) {
stgout(0); /* output queue from the very beginning (see
* assert() when localstaging is set to TRUE) */
Expand Down
7 changes: 7 additions & 0 deletions source/compiler/tests/incomplete_dowhile_crash.meta
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@@ -0,0 +1,7 @@
{
'test_type': 'output_check',
'errors': """
incomplete_dowhile_crash.pwn(6) : error 001: expected token: "while", but found "}"
incomplete_dowhile_crash.pwn(7) : error 001: expected token: ";", but found "-end of file-"
"""
}
6 changes: 6 additions & 0 deletions source/compiler/tests/incomplete_dowhile_crash.pwn
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
#pragma option -;+

main()
{
do {}
}