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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|}
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