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Windows MSVC Debug builds crashed unit.recursion_depth_protection.chai with SEGFAULT before the depth check could fire. Windows defaults to a 1 MiB thread stack and Debug builds emit much larger per-frame native stack usage (no inlining, /RTC, buffer security checks), so 256 nested ChaiScript calls overflow the native stack long before the dispatcher reaches max_call_depth. Linux/macOS and MSVC Release pass at 256. Pick a tighter default (32) only for the MSVC + _DEBUG configuration that needs it, leaving every other build at the original 256, and shrink the count_down recursion in the regression test so the bounded path stays well below every platform's default. Requested by @lefticus in PR #700 review. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
42 lines
1.2 KiB
ChaiScript
42 lines
1.2 KiB
ChaiScript
// Regression test for issue #633: Stack-overflow due to infinite recursion
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// in user-defined operator (string interpolation).
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//
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// Before the fix the recursive `/=` invocation triggered unbounded native
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// recursion in the evaluator and crashed the host process with a SIGSEGV.
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// The engine now bounds call_depth and throws a catchable exception
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// instead of letting the native stack overflow.
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def string::`/=`(double d) {
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this = "${this/= 2}/=${d}";
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return this;
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}
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var s = "o World"
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var caught = false
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var message = ""
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try {
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s /= 2
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// unreachable: the recursive operator must abort with an exception
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assert_true(false)
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} catch (e) {
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caught = true
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message = e.what()
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}
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assert_true(caught)
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// The reported error must mention the call-stack overflow so users can
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// distinguish it from an arbitrary script-level error.
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assert_true(find(message, "call stack") != -1)
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// A bounded recursion that stays well below the limit must keep working.
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// Use a small depth so the test passes on every platform default - notably
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// the MSVC Debug build where the native stack budget forces a tighter cap.
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def count_down(n) {
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if (n <= 0) { return 0 }
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return count_down(n - 1) + 1
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}
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assert_equal(10, count_down(10))
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