swiftlang/swift

[SR-407] Support ELF in cmpcodesize

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#43,024 opened on Dec 29, 2015

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good first issueimprovement

Description
Previous ID SR-407
Radar None
Original Reporter @modocache
Type Improvement
Votes 0
Component/s
Labels Improvement, StarterBug
Assignee None
Priority Medium

md5: 47c497e6ac62c1fc388cf821f38e6cd3

Issue Description:

In https://github.com/apple/swift/pull/638, Nadav Rotem mentions supporting ELF as a potential feature for cmpcodesize.

cmpcodesize is a tool used by the Swift performance team to measure the size of built Swift products. It would be useful to see the size of built products on Linux (ELF) as well as on OS X (Mach-O, which cmpcodesize currently supports).

While the script currently uses otool (available on OS X), the readelf executable could be used to analyze files linked with ELF. readelf is available on Linux.

The script could detect the current platform and use the appropriate executable.

Contributor guide

Tech stack
swiftshell
Domain
toolingperformance
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Knowledge of Swift's cmpcodesize toolBasic shell scriptingUnderstanding of ELF and Mach O
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
The issue references PR #638 by Nadav Rotem. The cmpcodesize tool is located in the Swift repository; the script currently uses otool on macOS. On Linux, readelf should be used instead. The solution involves detecting the platform and selecting the appropriate executable. There are no recent comments or maintainer questions.