Explicitly initialize empty context page by jbachorik · Pull Request #210 · DataDog/java-profiler

jbachorik · 2025-04-28T18:05:43Z

(followup to #308)

What does this PR do?:
It fixes compilation error on an old g++

Motivation:
We need to build on some rather old systems for compatibility sakes and it requires explicit initialization of the struct

Unsure? Have a question? Request a review!

(followup to #308)

github-actions · 2025-04-28T18:06:22Z

🔧 Report generated by pr-comment-cppcheck

CppCheck Report

Errors (2)

Warnings (4)

The class 'RecordingBuffer' defines member function with name 'flushIfNeeded' also defined in its parent class 'Buffer'.
Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
Member variable 'ElfParser::_vaddr_diff' is not initialized in the constructor.

Style Violations (296)

github-actions · 2025-04-28T18:07:00Z

🔧 Report generated by pr-comment-scanbuild

Copilot

Pull Request Overview

This PR fixes a compilation error on older g++ versions by explicitly initializing an empty context page.

Updates empty page initialization in the getPage function
Explicitly sets .capacity and .storage for the empty context case

Comments suppressed due to low confidence (1)

ddprof-lib/src/main/cpp/context.cpp:90

[nitpick] If your target compiler supports C++11 or later, consider using 'nullptr' instead of 'NULL' for improved type safety. However, if the legacy compatibility is required, this usage is acceptable.

return {.capacity = 0, .storage = NULL};

MattAlp

LGTM. For external context- this is necessary for our glibc 2.17 builds.

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[@jpbempel](https://github.com/jpbempel)) #### Profiling - ✨ Bump ddprof to 1.27.0 ([#8893](DataDog/dd-trace-java#8893) - [@jbachorik](https://github.com/jbachorik)) - Properly handle the adaptive sampling interval overflow by [@jbachorik](https://github.com/jbachorik) in DataDog/java-profiler#213 - Fix [#200](DataDog/dd-trace-java#200) Crash related to aligned\_alloc and free in context by [@yanglong1010](https://github.com/yanglong1010) in DataDog/java-profiler#208 - Explicitly initialize empty context page by [@jbachorik](https://github.com/jbachorik) in DataDog/java-profiler#210 - Re-connect crash recursion protection with VM stackwalker by [@jbachorik](https://github.com/jbachorik) in DataDog/java-profiler#214 - ✨ Enable ZSTD compression for profiling ([#8862](DataDog/dd-trace-java#8862) - [@MattAlp](https://github.com/MattAlp)) - ✨ Extend JPS re-implementation to J9 family ([#8813](DataDog/dd-trace-java#8813) - [@MattAlp](https://github.com/MattAlp)) - 💡 Collect process tags for profiling upload requests ([#8780](DataDog/dd-trace-java#8780) - 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GitOrigin-RevId: 9207366cdb6a1bd098082305d354a0a3c4622d7a

Explicitly initialize empty context page

ffd50db

(followup to #308)

jbachorik requested review from MattAlp and r1viollet April 28, 2025 18:05

jbachorik requested a review from Copilot April 29, 2025 12:03

Copilot AI reviewed Apr 29, 2025

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MattAlp approved these changes Apr 29, 2025

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jbachorik merged commit ebec9c4 into main Apr 29, 2025

jbachorik deleted the jb/context_old_g++ branch April 29, 2025 12:55

github-actions Bot added this to the 1.26.0 milestone Apr 29, 2025

zhengyu123 added the fixed_version: v_1.26.0 Version this PR's fix shipped in label Sep 8, 2026

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Explicitly initialize empty context page - #210

Explicitly initialize empty context page#210
jbachorik merged 1 commit into
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