[Issue 4708] expose rt.trace and rt.cover api's

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4708



--- Comment #1 from Brad Roberts <braddr at puremagic.com> 2010-08-22 00:51:04 PDT ---
Merely adding the calls to set the trace log files is enough to cause the files
to be created, even without -cov.  This is due to the calls being enough to
drag in the module and it's shared this/~this are invoked.

Also, for a simple test case, no trace results other than the file headers are
being produced:

module hello;

extern(C)
{
    int printf(const char*, ...);
    int trace_setlogfilename(string name);
    int trace_setdeffilename(string name);
}

void showargs(char[][] args)
{
    printf("hello world\n");
    printf("args.length = %d\n", args.length);
    for (int i = 0; i < args.length; i++)
        printf("args[%d] = '%s'\n", i, cast(char *)args[i]);
}

int main(char[][] args)
{
    trace_setlogfilename("test_results/runnable/hello-profile.d.trace.log");
    trace_setdeffilename("test_results/runnable/hello-profile.d.trace.def");

    showargs(args);

    return 0;
}

Results in:
::::::::::::::
test_results/runnable/hello-profile.d.out
::::::::::::::
../src/dmd -Irunnable -cov -od./test_results/runnable
-of./test_results/runnable/hello-profile runnable/hello-profile.d
./test_results/runnable/hello-profile
hello world
args.length = 1
args[0] = './test_results/runnable/hello-profile'

::::::::::::::
test_results/runnable/hello-profile.d.trace.def
::::::::::::::

FUNCTIONS
::::::::::::::
test_results/runnable/hello-profile.d.trace.log
::::::::::::::

======== Timer Is 3579545 Ticks/Sec, Times are in Microsecs ========

  Num          Tree        Func        Per
  Calls        Time        Time        Call

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