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dwprod

Find the DW_AT_producer for all compilation units within a shared library or executable.

What is `DW_AT_producer`?

The DW_AT_producer is an attribute within DWARF debug info that says what compiler was used to create each compilation unit that ended up within a given shared library or executable.

Usage

As a Library

First, add this to your Cargo.toml:

[dependencies.dwprod]
version = "0.1.0"
# Do not build the command line `dwprod` executable.
default-features = false

Then, import the dwprod crate and use it to iterate over DW_AT_producer values:

extern crate dwprod;

fn try_main() -> dwprod::Result<()> {
    let opts = dwprod::Options::new("path/to/some/executable");

    opts.producers(|producers| {
        while let Some(producer) = producers.next()? {
            println!("Found DW_AT_producer = {}", producer);
        }

        Ok(())
    })?
}

fn main() {
    if let Err(e) = try_main() {
        eprintln!("Uh oh! {}", e);
        ::std::process::exit(1);
    }
}

The fallible-iterator crate can also be used to leverage iterator combinators like map and filter:

extern crate dwprod;
extern crate fallible_iterator;

use fallible_iterator::FallibleIterator;
use std::path::Path;

fn each_rustc_producer<F>(
    shared_lib_or_exe: &Path,
    mut callback: F
) -> dwprod::Result<()>
where
    F: FnMut(String)
{
    let opts = dwprod::Options::new(shared_lib_or_exe);
    opts.producers(|producers| {
        producers
            // Filter down to only the producers with "rustc" in their name.
            .filter(|p| p.contains("rustc"))
            // Then map the given callback over each producer.
            .map(&mut callback)
            // Finally, use `count` to force iteration.
            .count()?;

        Ok(())
    })?
}

As a Command Line Tool

First, install via cargo:

$ cargo install dwprod

Then, run dwprod path/to/shared/library/or/executable to get a dump of all of the DW_AT_producer values for each compilation unit within the given shared library or executable.

Here is the result of running dwprod on itself:

$ dwprod $(which dwprod)
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
clang LLVM (rustc version 1.22.0-nightly (088216fb9 2017-09-04))
GNU C 4.8.5 -m64 -mtune=generic -march=x86-64 -g3 -O3 -O2 -O2 -std=gnu11 -fvisibility=hidden -funroll-loops -ffunction-sections -fdata-sections -fPIC
GNU C 4.8.5 -m64 -mtune=generic -march=x86-64 -g3 -O3 -O2 -O2 -std=gnu11 -fvisibility=hidden -funroll-loops -ffunction-sections -fdata-sections -fPIC
GNU C 4.8.5 -m64 -mtune=generic -march=x86-64 -g3 -O3 -O2 -O2 -std=gnu11 -fvisibility=hidden -funroll-loops -ffunction-sections -fdata-sections -fPIC
GNU C 4.8.5 -m64 -mtune=generic -march=x86-64 -g3 -O3 -O2 -O2 -std=gnu11 -fvisibility=hidden -funroll-loops -ffunction-sections -fdata-sections -fPIC
<truncated>

For more details about the dwprod command line tool, run dwprod --help.