Update CoverageMappingFormat Support to Version6
Version 5 adds Branch Regions which are a prerequisite for branch coverage. Version 6 can use the zeroth filename as prefix for other relative files.
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6 changed files with 66 additions and 23 deletions
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@ -17,10 +17,10 @@ use tracing::debug;
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/// Generates and exports the Coverage Map.
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///
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/// This Coverage Map complies with Coverage Mapping Format version 4 (zero-based encoded as 3),
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/// as defined at [LLVM Code Coverage Mapping Format](https://github.com/rust-lang/llvm-project/blob/rustc/11.0-2020-10-12/llvm/docs/CoverageMappingFormat.rst#llvm-code-coverage-mapping-format)
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/// and published in Rust's November 2020 fork of LLVM. This version is supported by the LLVM
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/// coverage tools (`llvm-profdata` and `llvm-cov`) bundled with Rust's fork of LLVM.
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/// This Coverage Map complies with Coverage Mapping Format version 5 (zero-based encoded as 4),
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/// as defined at [LLVM Code Coverage Mapping Format](https://github.com/rust-lang/llvm-project/blob/rustc/13.0-2021-09-30/llvm/docs/CoverageMappingFormat.rst#llvm-code-coverage-mapping-format).
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/// This version is supported by the LLVM coverage tools (`llvm-profdata` and `llvm-cov`)
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/// bundled with Rust's fork of LLVM.
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///
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/// Consequently, Rust's bundled version of Clang also generates Coverage Maps compliant with
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/// the same version. Clang's implementation of Coverage Map generation was referenced when
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@ -30,12 +30,12 @@ use tracing::debug;
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pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
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let tcx = cx.tcx;
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// Ensure LLVM supports Coverage Map Version 4 (encoded as a zero-based value: 3).
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// If not, the LLVM Version must be less than 11.
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let version = coverageinfo::mapping_version();
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if version != 3 {
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tcx.sess.fatal("rustc option `-Z instrument-coverage` requires LLVM 11 or higher.");
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}
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// While our bundled LLVM might support Coverage Map Version 6
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// (encoded as a zero-based value: 5), we clamp that to Version 5,
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// as Version 6 would require us to use the 0-th filename as a path prefix
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// for all other relative paths, which we don't take advantage of right now.
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let _version = coverageinfo::mapping_version();
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let version = 4;
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debug!("Generating coverage map for CodegenUnit: `{}`", cx.codegen_unit.name());
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