Commits on Jul 17, 2020

1. Generating the coverage map …

   rustc now generates the coverage map and can support (limited)
   coverage report generation, at the function level.
   
   Example:
   
   $ BUILD=$HOME/rust/build/x86_64-unknown-linux-gnu
   $ $BUILD/stage1/bin/rustc -Zinstrument-coverage \
   $HOME/rust/src/test/run-make-fulldeps/instrument-coverage/main.rs
   $ LLVM_PROFILE_FILE="main.profraw" ./main
   called
   $ $BUILD/llvm/bin/llvm-profdata merge -sparse main.profraw -o main.profdata
   $ $BUILD/llvm/bin/llvm-cov show --instr-profile=main.profdata main
       1|      1|pub fn will_be_called() {
       2|      1|    println!("called");
       3|      1|}
       4|       |
       5|      0|pub fn will_not_be_called() {
       6|      0|    println!("should not have been called");
       7|      0|}
       8|       |
       9|      1|fn main() {
      10|      1|    let less = 1;
      11|      1|    let more = 100;
      12|      1|
      13|      1|    if less < more {
      14|      1|        will_be_called();
      15|      1|    } else {
      16|      1|        will_not_be_called();
      17|      1|    }
      18|      1|}

   

   richkadel committed Jul 17, 2020
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