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Graph/premature-non-execution-semantics

AntiPattern

Premature Non-Execution

premature-non-execution-semantics

User-supplied code/data is treated as something to parse or model rather than execute, so the expected side effects never happen; similarly, language/runtime construction semantics can diverge from the caller’s assumptions.

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Updated7/26/2026

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30 linked nodes

MATCHESSolution

handle a scenario when the code is fine but backend went offline — prefetching data with usePrefetchQuery. Tension: prefetch works.

MATCHESSolution

z.strictObject() / .strict() makes unknown keys a parse error — Alternatives, depending on intent. Tension: the error message is generic. Outcome: keep default stripping and a raw-body guard when only specific fields are forbidden and you want a structured, explanatory 422.

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Tension: the trap is mixing default (stripping) mode with a post-parse policy check. Outcome: parse AFTER the guard.

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Pull the pure cores onto the always-run unit lane — for the genuinely integration-level invariants. Tension: a skipped test is not a passing test.

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bound it with a "progress ceiling" — a process emitting bytes but making NO semantic progress. Tension: a process emitting bytes but making NO semantic progress (livelock) would be shielded forever. Outcome: re-arms recovery after a long no-progress window even while bytes flow.

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Technically, it's not 100% free of undefined behavior. — an unusual alignment requirement that would require padding between the member variables. Tension: Nevertheless, it should be a reliable example.

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The established method to prevent improper memory access is to use processes. — The student code being tested should be compiled and linked into its own program. Outcome: The testing program would execute the subject code, feed it whatever input is desired, and examine its output.

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Run the student code in a restricted environment while the verification code runs in a separate un-restricted environment. Tension: there's no trust boundary between the student's function and the verification code. Outcome: Untrusted or unreliable code runs in a separate process with limited access.

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Untrusted Javascript can be run safely in a typical web browser. — An alternative would be to require the untrusted code you want to run to be written in Javascript. Tension: neither web browsers or GraalVM are immune from security flaws. Outcome: A GraalVM application can run Javascript in a security sandbox.

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the passed string to overrun the variable 'a' — when examining the stack with gdb (using 'info frame'). Tension: it doesn't happen. Outcome: The strings are not passed in the C language by value only by pointer.

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you're going to need to define your syntax very strictly, implement your own parser then hand off the final expression to eval. — if you allow anything which is not an arithmentic operator or a number to be 'eval'ed. Tension: the code is exploitable. Outcome: hand off the final expression to eval.

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Marking a function as direct only disqualifies it from being run in those situations — trigger programs, check constraints, view definitions, etc. Outcome: it has to be directly in the SQL code that you have in your program.

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new Function(userCode); — verify (client-side) that the user has entered valid JavaScript code. Tension: Pulling in a Javascript parser (e.g. Acorn or Esprima) is a relatively heavy dependency. Outcome: Parsing/compiling JS code is safe and has no side effects.

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`load` is still available. — if I set `os` and `io` to `nil` before running the script. Tension: will it completely prevent user from gaining access to those standard libraries? Outcome: This will allow loading malicious bytecode.

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only recompilation could grant a success. — Core Isolation. Tension: the alignment is required to be 0x1000. Outcome: Only recompilation will fix this.

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depending on your latency budget. Outcome: Same idea, but the state lives outside the process boundary.

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Stage 2 (startup). Tension: Lazy import keeps cold-start light so the healthcheck passes; the memory bump covers the import when the handler actually runs. Outcome: functions-framework can bind the port.

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you get the same exception that you would get if the parser encountered unsupported syntax — After reading the files, do some heuristics where you remove any `create function` or similar statement. Tension: I cannot modify these DDL files. Outcome: A pragmatic solution here is to match `create( or replace)? function.*?\\$\\$.*?\\$\\$.*?;` or similar.

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The changed code invokes undefined behaviour. — Java 25 FFM API. Tension: You can't rely on always getting this behaviour. Outcome: The caller's pointer is passed in to it, but it's never used.

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if the code is not built, so using `buildtype: None` should help — Java (and C#). Tension: the parameter "codeqlpathstoignore" but this does not work for Java. Outcome: using `buildtype: None` should help.

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extra `vpxor` instructions — JDK 23 version contains two extra `vpxor` instructions. Tension: How come extra instructions result in faster execution? Outcome: xor'ing a register with itself is a cheap trick to zero a register, including its higher bits.

MATCHESSolution

the intermediate operation, peek, does not inject into or remove elements from the stream. Tension: no need to execute the pipeline and, as a side-effect, print out the list elements. Outcome: Behavioral parameters with side-effects, which are strongly discouraged except for harmless cases such as debugging, may be affected.

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Outcome: This code compiles and runs as expected.

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Skip the SSO detector and switch to compiler-generated functions

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Ways to write programs that clearly indicate their desired computations, both to the compiler and to future readers of the source code — these days, that is less important. Tension: it remains important to give programmers expressive power. Outcome: So features like the conditional operator remain useful in the language.

MATCHESSolution

For MSVC, you'd need hand-written asm. Or 32-bit mode for inline asm. — MSVC. Tension: Both of which suck for performance wrapping a single instruction. Outcome: call/return overhead for a function.

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Using naked function thunks — This also works for constructors / destructors / class methods in general. Tension: with no thunks. Outcome: declare the functions as naked and directly jump to the absolute address where it is defined in the executable.

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unbounded memory allocation (DoS) — processing a crafted ELF file.

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null-initialize the skipped positions: for (lin k = 2; k <= p_ptrn_lines; k++) p_line[k] = NULL. — After artificially setting p_end = p_ptrn_lines+1 in the ptrn_missing path. Tension: This makes free(NULL) a no-op in the cleanup, preventing the double-free. Outcome: The fix was applied in GNU patch 2.7.6.

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Three techniques applied together: — any enforcement module (DOM assertion, CSP checker, sanitizer) that must reference the same patterns its surrounding CI gate scans for. Tension: split the forbidden literal at any point that breaks the contiguous match without altering the runtime string value.

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