4987 - support `browse_trace` tool in SubX

I've extracted it into a separate binary, independent of my Mu prototype.

I also cleaned up my tracing layer to be a little nicer. Major improvements:

- Realized that incremental tracing really ought to be the default.
  And to minimize printing traces to screen.

- Finally figured out how to combine layers and call stack frames in a
  single dimension of depth. The answer: optimize for the experience of
  `browse_trace`. Instructions occupy a range of depths based on their call
  stack frame, and minor details of an instruction lie one level deeper
  in each case.

Other than that, I spent some time adjusting levels everywhere to make
`browse_trace` useful.

1 files changed, 3 insertions, 0 deletions

diff --git a/subx/028translate.cc b/subx/028translate.cc
index d4b1a3a5..42b94632 100644
--- a/subx/028translate.cc
+++ b/subx/028translate.cc
@@ -34,6 +34,7 @@ if (is_equal(argv[1], "translate")) {
       output_filename = argv[i];
     }
     else {
+      trace(2, "parse") << argv[i] << end();
       ifstream fin(argv[i]);
       if (!fin) {
         cerr << "could not open " << argv[i] << '\n';
@@ -53,8 +54,10 @@ if (is_equal(argv[1], "translate")) {
     cerr << "must provide a filename to write to using '-o'\n";
     exit(1);
   }
+  trace(2, "transform") << "begin" << end();
   transform(p);
   if (trace_contains_errors()) return 1;
+  trace(2, "translate") << "begin" << end();
   save_elf(p, output_filename);
   if (trace_contains_errors()) {
     unlink(output_filename.c_str());