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| -rw-r--r-- | src/tools/coverage-dump/README.md | 5 | ||||
| -rw-r--r-- | src/tools/coverage-dump/src/main.rs | 19 |
2 files changed, 24 insertions, 0 deletions
diff --git a/src/tools/coverage-dump/README.md b/src/tools/coverage-dump/README.md index e2625d5adf2..49d8e14c7bc 100644 --- a/src/tools/coverage-dump/README.md +++ b/src/tools/coverage-dump/README.md @@ -6,3 +6,8 @@ The output format is mostly arbitrary, so it's OK to change the output as long as any affected tests are also re-blessed. However, the output should be consistent across different executions on different platforms, so avoid printing any information that is platform-specific or non-deterministic. + +## Demangle mode + +When run as `coverage-dump --demangle`, this tool instead functions as a +command-line demangler that can be invoked by `llvm-cov`. diff --git a/src/tools/coverage-dump/src/main.rs b/src/tools/coverage-dump/src/main.rs index 93fed1799e0..b21e3e292f2 100644 --- a/src/tools/coverage-dump/src/main.rs +++ b/src/tools/coverage-dump/src/main.rs @@ -7,6 +7,13 @@ fn main() -> anyhow::Result<()> { let args = std::env::args().collect::<Vec<_>>(); + // The coverage-dump tool already needs `rustc_demangle` in order to read + // coverage metadata, so it's very easy to also have a separate mode that + // turns it into a command-line demangler for use by coverage-run tests. + if &args[1..] == &["--demangle"] { + return demangle(); + } + let llvm_ir_path = args.get(1).context("LLVM IR file not specified")?; let llvm_ir = std::fs::read_to_string(llvm_ir_path).context("couldn't read LLVM IR file")?; @@ -15,3 +22,15 @@ fn main() -> anyhow::Result<()> { Ok(()) } + +fn demangle() -> anyhow::Result<()> { + use std::fmt::Write as _; + + let stdin = std::io::read_to_string(std::io::stdin())?; + let mut output = String::with_capacity(stdin.len()); + for line in stdin.lines() { + writeln!(output, "{:#}", rustc_demangle::demangle(line))?; + } + print!("{output}"); + Ok(()) +} |