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Valgrind helper

The Valgrind plugin Callgrind can be used to profile D code, but it does not know how to handle D's mangled names. This program can be used to clean up the callgrind.out.nnnnn file so that tools like KCachegrind can display them more legibly.



import std.array;
import std.stdio;
import std.demangle;
import std.regex;
import std.conv;

auto re = ctRegex!(`(_D\d[\w_]+)`);

void main(string[] args)
    auto isStdin = args.length == 1;
    auto inFile = isStdin ? stdin : File(args[1]);
    auto outFile = isStdin ? stdout : File(args[1] ~ ".demangled", "w");
    foreach (l; inFile.byLine(KeepTerminator.yes))
        outFile.write(replace!(a => demangle(to!string(a.hit)).replace("\"", "''"))(l, re));


Let's take the classic "Hello, World!" example:


import std.stdio;

void main(string[] args)
    writeln("Hello, World!");

Compile hello.d with debug symbols:

$ dmd -g hello.d

Profile the resulting binary using Valgrind:

$ valgrind --tool=callgrind --dump-instr=yes --collect-jumps=yes --callgrind-out-file=callgrind_out ./hello

Valgrind options:

  • --tool=callgrind - select the Callgrind plugin
  • Callgrind options:
    • --dump-instr=yes - per-instruction granularity; allows to see assembly code in KCachegrind
    • --collect-jumps=yes - gather information about conditional jumps
    • --callgrind-out-file - as the name suggests, the file where you want Callgrind to save the profile data

For more information regarding Callgrind and it's options see the man pages

Now demangle the profile data:

$ ./dcallgrind callgrind_out

This will create a file called callgrind_out.demangled that you can then view using KCachegrind.

MiniLibD - Embedded D usage

This collection has libraries and tools to compile D language programs for embedded systems with the gdc compiler.

The original D runtime library uses libraries from the operating system. It can not be used in embedded systems when there is no operating system.

Get the source.