feat(gotter)!: add fn to hook symbol but exclude self

[gyuheon0h]

Stacked above feat(got-hook)!: add DT_HASH fallback, relocation type guard, and hook_symbol

PROF-15630

What does this PR do?

PHP needs to be able to hook libs and bins but skip its own exported fn.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

How to test the change?

Describe here in detail how the change can be validated.

[gyuheon0h]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(gotter)!: add fn to hook symbol but exclude self #2312 👈 (View in Graphite)
• feat(gotter)!: add DT_HASH fallback, relocation type guard, and hook_symbol #2297 : 1 other dependent PR (#2268 )
• refactor(got-patching): extract shared GOT-patching primitives into libdd-got-hook #2282
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

📚 Documentation Check Results

⚠️ 6 documentation warning(s) found

📦 libdd-gotter - 6 warning(s)

---

Updated: 2026-08-07 18:57:26 UTC | Commit: cadf65b | missing-docs job results

[github-actions]

🔒 Cargo Deny Results

✅ No issues found!

📦 libdd-gotter - ✅ No issues

---

Updated: 2026-08-07 18:59:22 UTC | Commit: cadf65b | dependency-check job results

[datadog-prod-us1-6]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 56.25%
• Overall Coverage: 74.99% (-0.97%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 45342c8 | Docs | Datadog PR Page | Give us feedback!}

[pr-commenter]

Benchmarks

Comparison

Benchmark execution time: 2026-08-07 19:39:35

Comparing candidate commit 45342c8 in PR branch gyuheon0h/got-hook-exclude-self with baseline commit 4144d50 in branch gyuheon0h/got-hook-utils.

Found 7 performance improvements and 4 performance regressions! Performance is the same for 157 metrics, 10 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

• 🟩 = significantly better candidate vs. baseline
• 🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:alloc_free/system/4096

• 🟩 execution_time [-21.674ns; -21.538ns] or [-20.484%; -20.355%]

scenario:datadog_sample_span/multiple_rules_last_match/wall_time

• 🟥 execution_time [+14.746ns; +14.849ns] or [+7.398%; +7.450%]

scenario:glob_matcher/ascii_case_insensitive_match/wall_time

• 🟥 execution_time [+1.905ns; +1.923ns] or [+6.920%; +6.986%]

scenario:glob_matcher/ascii_exact_match/wall_time

• 🟥 execution_time [+2.364ns; +2.382ns] or [+8.588%; +8.656%]

scenario:glob_matcher/ascii_wildcard_question_match/wall_time

• 🟩 execution_time [-21.257ns; -21.184ns] or [-36.500%; -36.374%]

scenario:glob_matcher/ascii_wildcard_star_match/wall_time

• 🟩 execution_time [-21.435ns; -21.411ns] or [-36.791%; -36.750%]

scenario:glob_matcher/unicode_exact_match/wall_time

• 🟩 execution_time [-4.337ns; -4.278ns] or [-5.565%; -5.489%]

scenario:no_profiler/short_circuit/4096

• 🟩 execution_time [-7.754ns; -7.609ns] or [-7.544%; -7.403%]

scenario:profiler_attached/slow_path_system/4096

• 🟥 execution_time [+10.016ns; +10.137ns] or [+6.925%; +7.009%]

scenario:trace_buffer/4_senders/no_delay

• 🟩 execution_time [-189.104µs; -160.426µs] or [-7.633%; -6.475%]
• 🟩 throughput [+101846.895op/s; +120285.335op/s] or [+7.004%; +8.272%]

Candidate

Omitted due to size.

Baseline

Omitted due to size.

[dd-octo-sts]

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	8.07 MB	8.07 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	87.84 MB	87.84 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	98.97 MB	98.97 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.88 MB	10.88 MB	0% (0 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	26.21 MB	26.21 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	89.92 KB	89.92 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	188.66 MB	188.66 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	985.57 MB	985.57 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	8.56 MB	8.56 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	89.92 KB	89.92 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	25.22 MB	25.22 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	50.23 MB	50.23 MB	0% (0 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	22.84 MB	22.84 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	91.33 KB	91.33 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	193.44 MB	193.43 MB	-0% (-8.00 KB) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	974.34 MB	974.34 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	6.61 MB	6.61 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	91.33 KB	91.33 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	27.12 MB	27.12 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	47.83 MB	47.83 MB	0% (0 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	78.21 MB	78.21 MB	0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	9.00 MB	9.00 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	93.85 MB	93.85 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.97 MB	10.97 MB	0% (0 B) 👌

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