Commits on Aug 26, 2020

1. Tools and tests to experimentally add more counters per function …

   Adds a new mir_dump output file in HTML/CSS to visualize code regions
   and the MIR features that they came from (including overlapping spans).
   
   Adds `--bless` support to `test/run-make-fulldeps` so expected coverage
   output can be quickly regenerated.
   
   Adds a new `-Zexperimental-coverage` option that implies
   `-Zinstrument-coverage`, but can be used to enable experimental coverage
   counter injection.
   
   Includes a basic, MIR-block-based implementation of coverage injection,
   available via `-Zexperimental-coverage`. This implementation has known
   flaws and omissions, but is simple enough to validate the new tools and
   tests.
   
   The existing `-Zinstrument-coverage` option currently enables
   function-level coverage only, which at least appears to generate
   accurate coverage reports at that level.
   
   Experimental coverage is not accurate at this time. When branch coverage works as
   intended, the `-Zexperimental-coverage` option should be removed.
   
   Also, learned that `-C link-dead-code` (which was enabled automatically
   under `-Z instrument-coverage`) was causing the linking error that
   resulted in segmentation faults in coverage instrumented binaries. Link
   dead code is now disabled under MSVC, allowing `-Zinstrument-coverage`
   to be enabled under MSVC for the first time.
   
   Rust compiler MCP rust-lang/compiler-team#278
   
   Relevant issue: rust-lang#34701 - Implement support for LLVMs code coverage
   instrumentation

   

   richkadel committed Aug 26, 2020
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