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| -rw-r--r-- | clang/docs/SourceBasedCodeCoverage.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/clang/docs/SourceBasedCodeCoverage.rst b/clang/docs/SourceBasedCodeCoverage.rst index 75ab258e8fc..22420d97cd9 100644 --- a/clang/docs/SourceBasedCodeCoverage.rst +++ b/clang/docs/SourceBasedCodeCoverage.rst @@ -185,6 +185,22 @@ Format compatibility guarantees into instrumented binaries. Tools must retain **backwards** compatibility with these formats. These formats are not forwards-compatible. +Using the profiling runtime without static initializers +======================================================= + +By default the compiler runtime uses a static initializer to determine the +profile output path and to register a writer function. To collect profiles +without using static initializers, do this manually: + +* Export a ``int __llvm_profile_runtime`` symbol. The linker won't pull in the + object file containing the profiling runtime's static initializer if this + symbol is defined. + +* Call ``__llvm_profile_initialize_file`` once. This parses + ``LLVM_PROFILE_FILE`` and sets the output path. + +* Call ``__llvm_profile_write_file`` to write out a profile. + Drawbacks and limitations ========================= |
