bjoernager/rust
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Add profiling support, through the rustc -Z profile flag.

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When -Z profile is passed, the GCDAProfiling LLVM pass is added
to the pipeline, which uses debug information to instrument the IR.
After compiling with -Z profile, the $(OUT_DIR)/$(CRATE_NAME).gcno
file is created, containing initial profiling information.
After running the program built, the $(OUT_DIR)/$(CRATE_NAME).gcda
file is created, containing branch counters.

The created *.gcno and *.gcda files can be processed using
the "llvm-cov gcov" and "lcov" tools. The profiling data LLVM
generates does not faithfully follow the GCC's format for *.gcno
and *.gcda files, and so it will probably not work with other tools
(such as gcov itself) that consume these files.
This commit is contained in:
whitequark 2017-02-13 09:57:50 +00:00
parent 06fb4d2564
commit 42754ce710
32 changed files with 296 additions and 9 deletions
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1
configure vendored
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@ -452,6 +452,7 @@ opt vendor 0 "enable usage of vendored Rust crates"
opt sanitizers 0 "build the sanitizer runtimes (asan, lsan, msan, tsan)"
opt dist-src 1 "when building tarballs enables building a source tarball"
opt cargo-openssl-static 0 "static openssl in cargo"
opt profiler 0 "build the profiler runtime"
# Optimization and debugging options. These may be overridden by the release channel, etc.
opt_nosave optimize 1 "build optimized rust code"