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Catch if &add_func/&delete_func is applied to IDs that don't have values.

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We do to allow adding &add_func to a global that's not immediately
initialized, as a later redef may fix that.

Closes #467.
This commit is contained in:
Robin Sommer 2020-08-18 10:31:16 +00:00
parent 5816ea27e9
commit 45bef16be0
3 changed files with 24 additions and 0 deletions
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7
src/ID.cc
View file

@ -220,6 +220,13 @@ void ID::SetVal(ExprPtr ev, InitClass c)
if ( ! a )
Internal("no add/delete function in ID::SetVal");
if ( ! val )
{
Error(fmt("%s initializer applied to ID without value",
(c == INIT_EXTRA ? "+=" : "-="), this);
return;
}
EvalFunc(a->GetExpr(), std::move(ev));
}

2
testing/btest/Baseline/language.global-unset-addto/output Normal file
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@ -0,0 +1,2 @@
error in /Users/robin/bro/master/testing/btest/.tmp/language.global-unset-addto/global-unset-addto.zeek, line 4: += initializer applied to ID without value (a)
error in /Users/robin/bro/master/testing/btest/.tmp/language.global-unset-addto/global-unset-addto.zeek, line 5: -= initializer applied to ID without value (b)

15
testing/btest/language/global-unset-addto.zeek Normal file
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@ -0,0 +1,15 @@
# @TEST-EXEC-FAIL: zeek -b %INPUT >output 2>&1
# @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff output
global a: count &add_func = function(old: count, new: count): count { return 3; };
global b: count &delete_func = function(old: count, new: count): count { return 3; };
redef a += 13;
redef b -= 13;
# The following is ok.
global c: count &redef &add_func = function(old: count, new: count): count { return 3; };
redef c = 0;
redef c += 13;