Source-Based Code Coverage

Technique

Source-based code coverage is a code-coverage technique in which instrumentation is embedded into the compiled program itself, allowing tools such as Clang and llvm-cov to collect per-line, per-region, and per-branch execution data directly tied back to source locations.

First seen 7/28/2026

Last seen 7/28/2026

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WIKI

Source-Based Code Coverage

Source-based code coverage is a code-coverage methodology in which the compiler embeds instrumentation directly into the generated program at compile time. Rather than relying on external instrumentation or post-link rewriting, the compiled binary itself records which executable regions, branches, and source lines were actually executed when the program ran.

How it works

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RELATIONSHIPS

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llvm-cov ← implements 92% 1e

llvm-cov generates coverage reports based on the Source-Based Code Coverage technique documented by Clang.

Clang ← implements 93% 1e

Clang documents and implements Source-Based Code Coverage, as evidenced by the link to clang.llvm.org documentation on the technique.

LINKED ENTITIES

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llvm-cov IMPLEMENTS Extracted graph relationship

Clang IMPLEMENTS Extracted graph relationship

CITATIONS

3 sources

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[1] The coverage report was generated by llvm-cov. Coverage Report

[2] The coverage report links to Clang/LLVM documentation that explains how to interpret source-based code coverage reports. Coverage Report

[3] The llvm-cov tool used was built from LLVM version 21.1.8-rust-1.94.0-stable. Coverage Report